CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTE~IES SURFACE-TREATED WITH RLUORINE COPOLYMER AND METHOD OR MANUFACTURING THE SAME The present invention relates to a cathode active material, which may be repeatedly charged and discharged, for litliinn~ secondary batteries and a method of manufacturing the satne. 10 In line with development of information techt~ology (IT), various portable it~formationa nd communication devices have entered widespread use and thus the 21S' ceritury is developing into a "ubiquitous society" where high quality i~ifor~~iatioo services are available regnrdless of time and place. L,itliium secondary batteries play a key role in such develop~nent towards the ubiquitous society. Lithium seco~~dary 15 batteries have higher operating voltage and energy density, are used for a longer period of time than other secondary batteries and thus can satisfy sophisticated requirements according to diversification and increasing complexity of devices. Recently, attempts to improve existing lithium secondary battery teclu~ology are actively underway around tlie world such that the existing lithium secondary batteries can be applied to ecofriendly hydrogen systems snch as electric vehicles and tlie like, power storage systems, and the like. Korean Application Pub. No. 10-2005-0114516 discloses a cathode active 5 material for litliom secondary batteries including a lithium-containing co~npositeo xide, a surface of which is coated with heterogeneous metal oxides. Korean Patent No. 10-0479900 discloses a lithium-containing transition metal oxide having a spinel structure, in which solne manganese (Mn) is substituted with at least one metal element selected from the group consisting of Ni, Co, Fe, Cr and Cu, 10 and at least one metal elenlent selected from the group consisting of silicon (Si) and titanium (Ti). [TECHNICAL PROBLEM] The present invention aims to provide a cathode active material for lithium 15 secondary batteries having a novel structure different from tlie cathode active material introduced in Korean Application Pub. No. 10-2005-0114516 by treating surfaces of lithium-containing rneta1,oxide particles with a fluorine copolymer. In addition, inventors of the present application confirlned that the con~pou~id introduced in Korean Patent No. 10-0479900, wherein some iiianganese of a litliiomcotitailling manganese oxide having a spinel strtictt~rcw as substituted with nietal such as nickel and the like, has a high operating potential and , as such, an eelctmlytic 5 solution is deco~nposed even in a nornial operating range of a battery and battery performance is deteriorated due to side reaction with an electrolytic solution. In addition, elution of Mn ions was co~rfirnietl. Such problems were not observed ill I,iMn204 having an operating voltage of around 4 V. To address tlie above problems, in tlie present invention, a surface of a lithium-containing metal oxide having a spinel 10 structure is treated with a fluorine copolymer. A cathode active tilaterial for litliimn secondary batteries according to nonlilnititig embodiments of tlie present invention includes litliiuni-containiag metal oxide particles; a first surface treatment layer foniied on the surfaces of litliium-containing 15 metal oxide particles, and including at least one corilpountl selected from tlie group consisting of fluorine-doped cnetal oxides and fluori~~e-dopendie tal hydroxides; and a second surface treatment layer formed on a surface of the first surface treatment layer and includirig a fluorine copolymer. The catliode active material according to the present invention ir~cludesa first surface treatment layer and a second surface treatment layer, each of fvl~iclin~c ludes fluorine, and, in particulal; may increase the concentration of litl~iuito~n~s in a cathode active ~naterial surface by electrochemical reaction of a fluorine copolymer (-CF) 5 mainly existing in the second surface treatment layer ant1 thereby movetncnt of lithium ions occurring during charge and discharge on a surface of a lithium-containing metal oxide may be more easily perfor~ned. As a result, side reaction of a cathode active material surface and an electrolytic solution, and elution of manganese, at high voltage, may be suppressed and thereby a high voltage lithium secondary battery may be 10 provided. The first surface treatnxent layer may entirely cover the surfaces of lithiumcontaining metal oxide particles, and the second surface treatment layer xilay partially or entirely cover a surface of the first surface treatment layer. In addition, w11e11 the first sorface treatment layer partially covers a surface of the lithium-containing metal oxide, 15 the second surface treatnlent layer may pattially cover a surface of the lithituncontaining metal oxide and may partially or entirely cover a surface of the first surface treatment layer. According to non-limiting embodiments of the present invention, the catliode active material may be prepared by mixing the lithiut~~-co~itainmire~tagl oxide particles 20 with the fluorine copolymer in an amount of 0.05 wt% or more and less than 5.00 wt% -4- based on tlie total weight of the catl~ode active material, and heat-treating in the atmospliere. In this case, the flnorinc-doped il~etal oxide may be a fluorine-doped lithium-containing metal oxide wherein some oxygen of tlie lithium-containing nletal oxide is substituted with fluorine. The amount of the fluorine copolymer may be 5 particularly 0.05 wl% or inore and 3 wt% or less, more particularly 0.10 wt% or niore and less than 1.00 wt%, even more paiticularly 0.20 wt% or more and less than 1.00 w*, based on the total weight of the cathode active material. Referring to a specific experimental exaniple of the present invention, it can be confirmed that, when the amount of the fluorine copolymer is less than 0.05 wt%, 10 desisetl effects are not exhibited, and, wllen the amount of the fluorine copolylner is 5.00 wt% or niore, initial discharge capacity and high-temperature lifespan characteristics at 45OC are reduced ant1 self discharge increases due to gas generated doring high-temperature storage of 45°C. Therefore, the cathode active material accorcling to the present invention has 15 critical effects when the amonnt of the fluorine copoly~neris 0.05 wt% or more and less than 5.00 wt% based on the total weight of the cathode active material. The fluorine-doped metal oxide may exist on tlie surfaces of lithiumcontaining nietal oxide particles in a particle for~n.I n addition, the fluorine copoly~ner may exist in a surface of the first surface treatment layer in a particle form (See SEM images of FIGS. 1 and 2). In tliis case, an average particle diameter (D50) of the fluorine-doped litlliurn-containing metal oxide particle may be within an average thickness range of the first surface treatment layer and an average particle diameter (D50) of the fluorine copolytner pai-ticles may bc within an average tl~icknessr ange of 5 the second surface treatnieni layer. In particular, each of average particle dianietcrs (D50) of the fluorine-doped metal oxide particles and the fluorine-doped metal hydroxide particles may be, for example, 1 tim or more and less than 1500 nm, particularly, 10 nm or inore and 1000 run 01. less within the range described above. W11en each of the average particle 10 diameters (D50) of the fluorine-doped inetal oxide particles and the fluorine-doped metal hydroxide particles is less than 1 11111, tlie particles may be disadvantageously coagulated in excessively small sizes. On the other hand, when each of the average particle diarnelers (D50) of the fluorine-doped ~iletalo xide particles and the floorinedoped metal hydroxide particles is 1500 nm or more, efficiency of a preparation process 15 may be disadvantageously reduced. In non-limiting embodiments of tlie present invention, the cathode active material nlay be prepared by mixing the lithium-containing metal oxide particles wit11 0.05 wt% to 2.00 wt% of a metal oxide, a metal hydroxide or a mixture thereof based 011 the total weight of the cathode active material, and 0.05 wi% or more and less than 5.00 wt% of a fluorine copolymer based on the total weight of the cathode active material, and heat-treating in the atmosphere. In this case, in the fluorine-doped metal oxide, some oxygen of a11 oxide of a metal selected from the group consisting of Al, Mg, Ni, Co, Ti, Cr, Mo, Bi, Zn, Zr, Ru 5 a d W may be substituted with fluorine, and in the fluorine-doped metal hydroxide, some hydroxyl groups of an hydroxide of one metal selected from the group consisting of Al, Mg, Ni, Co, Ti, Cr, Mo, Bi, ZII, Zr, I Initial charae and discharge characteristics Charge atid discharge characteristics of a coin battery manufactured according to each of Examples 1 to 6 and Comparative Examples 1 to 3 were estimated by 5 charging and discharging once at a current of 0.1 C in a voltage range of 3.5 to 4.9 V. Results are summarized in Table 1 below. Comparative Example 2 Con~parative Example 3 149.6 142.5 127.5 129.4 85.2 90.8 As sl~own in Table 1, it can be confirn~ed that the batteries manofacture(i according to Examples 1 to 6 of the present invention exhibit relatively improved initial charge and discharge efficiency, when compared to the batteries manl~factured according to Comparative Examples 2 and 3, and the battery mant~factured according 5 to Comparative Example 1 exhibits relatively high initial cl~arge/discl~argeeff iciency but low initial ctlarge capacity. Tile cathode active material ma~lufactured according to each of Exanlples 1 to 6 of the present itlventioil has a first sl~rfacetr eatme111 layer and a second surface treatment layer \vllich include fluorine, and, in particular, the flnorine copoly~ner mainly existing in the second surface treatment layer increases a 10 concentration of litl~iumio ns by electrocl~e~nicraela ction, and, accordingly, lithium ion migrations on a surface of the lithium-containir~gm etal oxide occurring during charge and discharge may be more easily preformed. Nigh-temperature lifespan characteristics 15 Lifespan characteristics of the coin battery manufactured according to each of Exarnples 1 to 6 and Corllparative Exarllples 1 to 2 were evaluated by charging and discharging 200 times at a current of 1.0 C at 4S°C. Results are sunllnarized in Table 2 below. High-temperature lifespan characteristics 200"'/lS' discharge capacity (%) L Example 2 I Example 1 88.7 Exarilple 3 91.2 I Example 4 I I Coniparative Example 1 ---I 92.6 Example 5 I 92.4 Example 6 As shown in Table 2, it can be confirilled that the battery manufactured 90.2 I according to each of Example 1 to 6 of the present invention exhibits relatively superior Conlparative Example 2 lifespan characteristics at high-tenlperature , when compared to the batteries 85.4 manufactured according to Comparative ~ x a t n ~ l1e asn d 2. The cathode active material 5 of the battery manufactured according to each of Examples 1 to 6 of the prescnt invention has a predetermined surface-treatment layer including fluorine and, as such, side reaction of a cathode active material surface and an electrolyte, and elution of manganese, at high voltage, may be suppressed. Self discharge amount I Gas generation amount Example 1 Examnple 2 Example 4 Exatilple 5 Example 6 Comparative Example 1 Cotilparative Example 2 As shown in Table 2, it can be confirn~ed that the battery manufachired according to each of Examples 1 to 6 of the present invention exhibits relatively low self discharge amount and gas generation amount, when co~npared to the batteries 10 nianufactured according to Cot~~parativEex amples 1 and 2. The cathode active material of the battery manufactured according to each of Examples 1 to 6 of the present invention has a predetern~ined surface treatment layer including fluorine and, side reaction of a cathode active ~naterial surface and an electrolyte, and elution of manganese, at high voltage, may be su~ppressed. Those skilled in tlie art will appreciate that various modifications, additions 5 and substitutions are possible, without departing fiom the scope and spirit of the invention as disclosed in the accompanying clairns. [INDUSTRIAL APPLICABILITY] As described above, in the present invention, a cathotle active material for lithium secondary batteries is surface-treated with a fluorine copolynler and thereby a 10 cathode active material, which has a novel structure, including a first surface treatment layer having a inetal oxide layer doped with fluorine and/or a metal hydroxide layer doped with fluorine, and a secorltl surface treatment layer including a fluorine copolyn~eris provided, and, accordingly, lithiu~nio n movement on a lithium-containing rnetal oxide surface during charge and discharge may be facilitated. 15 In particular, it can be confirmed that, when the amount of the fluorine copolymer is less than 5 wt% based on the total weight of the cathode active material, initial charge and discharge characteristics, high-temperature lifespan characteristics and high-temperatore storage cl~aracteristicsm ay be improved. In addition, a lithium-containing tra~~sitiomne tal oxide accordi~~tog Formula 1 having a spi~lels t~vcturem ay suppress side reaction of a cathode active material surface and an electrolyte, and elution of manganese, at high tenlperature, wl~en compared to a compound in which some manganese is substituted with a nletal element 5 such as Ni or the like, and, as such, a high voltage lithiutn secondary battery may be provided. [CLAIMS] [Claim 11 A cathode active material for lithium secondary batteries comprising: lithium-containing tnetal oxide particles; a first surface treatment layer formed on the surfaces of the lithium-containing 5 metal oxide particles and con~prising at least one conlponnd selected from the group coi~sistingo f fluorine-doped nietal oxides and fluorine-doped metal llydroxides; and a second surface treatment layer formed on a surface of the first surface treatment layer and colllprising a flrlorille copoly~i~er. [Claim 21 The cathode active material accorcling to claim 1, wherein the fluorine- 10 doped metal oxide is a floorit~e-doped Lithiumn-containing metal oxide generated by substituting some oxygen of the lithiutn-containil~gm etal oxide with fluoritie. [Claim 31 ?he cathode active material according to claim 1, wherein the fluorinedoped tnetal oxide is generated by srlbstituti~tiags ome oxygen of an oxide of one metal selected from the group cot~sistil~ogf Al, Mg, Ni, Co, Ti, Cr, Ma, Bi, Zn, Zr, RII and W 15 with fluorine. [Claim 41 The cathode active material according to claim 3, wherein the ariiount of the fluorine-doped metal oxide is 0.05 wt% or more and less than 2.00 wt% based on the total weight of the cathode active material. -29- [Claim 51 Tlle cathode active material according to clairll 1, wherein tlie fluorinedoped metal hydroxide is generated by substitnting some llydroxyl groups of an hydroxide of one metal selected fiom the group consisting of Al, Mg, Ni, Co, Ti, Cr, Mo, Bi, Zn, Zr, Ru and W wit11 fluorine. 5 [Claim 61 The cathode active material according to claim 5, wherein the amount of the fluorine-doped metal ltydroxide is 0.05 \vt% or more and less than 2.00 wt% based on the total weight of tlie cathode active material. [Claim 71 The cathode active material according to claim 1, wherein the fluorine copoly~ner is at least one selected from the group consisting of polyvinylfluoride, 10 polyvinylidene fluoride, polytetrafluoroethylene, polychlorotrifluoroethylene, perfluoroalkoxy polymer, fluorinated ethylene-propylene, polyethylenetetrafl~~oroethylene, polyethyle~~echlorotrifluoroethylene, perfluoroelaston~er, fluorocarbon, perfluoropolyether, and perfloorosulfonic acid. [Claim 81 The cathode active material according to claim 1, wherein t 1x3 15 lithium-containing metal oxide is a lithium transition metal oxide having a layered stl~~ctuorre having a spinel structure. [Claim 91 The cathode active material according to claitn 8, wlierein tlie litlliun~ transition metal oxide having the spinel structure has a cotnposition represented by Fonnula 1 below: wherein M is at least one selected fro111 the group consistittg of Ni, Ti, Co, Al, Cu, Fe, Mg, B, Cr, Zn and Period 5 tra~lsitiot~l netals; and - 0 . l S 0 . 1 and 0.3x50.8. The cathode active material according to clai111 9, wl~erein the lithium transition metal oxide having the sl>inel structure has a composition represented by Fonnula 2 below: 10 wherein M is at least one selected from the group consisting of Ti, Co, Al, Cu, Fe, Mg, B, Cr, Zti and Period 5 transition metals; and [Claim 11 1 'rile cathode active material according to claim 1, wherein the first surface treatment layer entirely covers a surface of the lithium-containing metal oxide and the 15 second surface treatment layer entircly covers a surface of the first surface treatment layer. [Claim 121 The cathode active material according to clairn 1, wherein the first surface treatment layer partially covers a surface of the lithium-containing metal oxide, and the second surface treatment layer partially covers a surface of the lithium-containing metal oxide and entirely covers a surface of the first surface treatment layer. 5 [Claim 131 The cathode active material according to claim 1, wherein the fluorinedoped metal oxide and the fluorine-doped metal hydroxide exist on a surface of the lithiuln-containing metal oxide in a particle fonn. [Claim 141 The cathode active material according to claiul 13, wherein an average particle diameter of each of the fluorine-doped nletal oxide and the fluorine-doped tnetal 10 hydroxide particles is 1 Inn or Illore to 1800 mn. [Claim 151 The cathode active material according to claiin 1, wherein the fluorine copolymer exist in a surface of the first surface treatment layer it1 a particle fonn. [Claim 161 A cathode for lithium secondary batteries, wherein an electrode mixture layer conprising the cathode active material according to claim 1, a conductive material 15 and a binder is coated on a current collector. [Claitn 171 A lithium secondary battery conlprising the cathode according to clailu 16. [Clainl 181 h battery pack comprising the lithium secondary battery according to [Claim 191 An electric vehicle using the battery pack according to claim 18 as a power source. S [Clainr 201 A method of preparing the cathode activc material according to claim 1, \vl~ereint he litldum-co~ltai~liurngc tal oxicle particles are nlixecl wit21 0.05 wt% or Inore and less than 5.00 wt% of thc fluorine copolymer based on the total weight of the cathode active inaterial and heat-treated in the atmosphere. [Claim 211 The method according to claim 20, wherein 0.05 wt% to 2.00 wt% of 10 nletal oxide, metal liydroxide, or a mixture thereof \\'as fi~rthenr lixed based on the total weight of the cathode active nlnterial and heat-treated io the atmosphere.