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Lithium Secondary Battery Having Lithium Metal Formed On Cathode And Manufacturing Method Therefor

Abstract: The present invention relates to a lithium secondary battery and, more particularly, to a lithium secondary battery having lithium, serving as an anode active material, formed on a cathode side thereof and a manufacturing method therefor. In the lithium secondary battery according to the present invention, a lithium thin film is coated under an air tight condition during a process of forming the lithium thin film on an anode current collector, which can restrain the formation of a native oxide layer, attributed to oxygen and moisture in air, on the lithium thin film, with the consequent improvement of cycle life characteristics therein.

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Notices, Deadlines & Correspondence

Patent Information

Application #
Filing Date
13 September 2018
Publication Number
51/2018
Publication Type
INA
Invention Field
ELECTRICAL
Status
Email
Parent Application
Patent Number
Legal Status
Grant Date
2023-12-15
Renewal Date

Applicants

LG CHEM, LTD.
128, Yeoui-daero, Yeongdeungpo-gu, Seoul 07336

Inventors

1. SON, Byoung Kuk
LG Chem Research Park 188, Munji-ro, Yuseong-gu, Daejeon 34122
2. JANG, Min Chul
LG Chem Research Park 188, Munji-ro, Yuseong-gu, Daejeon 34122
3. CHOI, Jung Hun
LG Chem Research Park 188, Munji-ro, Yuseong-gu, Daejeon 34122
4. PARK, Eun Kyung
LG Chem Research Park 188, Munji-ro, Yuseong-gu, Daejeon 34122
5. PARK, Chang Hun
LG Chem Research Park 188, Munji-ro, Yuseong-gu, Daejeon 34122

Specification

Art [1] This application claims the benefit of priority based on the July 14, Korea Patent Application No. 10-2016-0089154, 2016, and all information disclosed in the literature of the Korea patent application is included as part of the specification. [2] The present invention relates to a lithium secondary battery, and more particularly, to a lithium metal on a lithium secondary battery and its preparation method are formed on the anode side. [3] BACKGROUND [4] Latest mobile phones, which have been developed various devices that require batteries, ranging from wireless appliances, electric vehicles, and depending on the development of these devices is also increasing demand for secondary batteries. In particular, it is a trend that, with the miniaturization trend of electronic products, the secondary battery is also light weight and small size. [5] [6] Consistent with this trend, a lithium secondary battery that use the current the lithium metal as the active material has received much attention. Lithium metal has a low oxidation-reduction potential (standard -3.045V for the hydrogen electrode) is larger weight energy density (3,860mAhg -1 got a) properties has been expected as an anode material for high-capacity secondary battery. [7] [8] However, the manufacture of a general battery by attaching a lithium foil on the collector in the plane in the case of using lithium metal as a battery cathode, lithium, since the reactive size as the alkali metal and the reaction of water and the explosive, it also reacts with the oxygen in the air Under normal circumstances it is difficult to manufacture and use disadvantages. In particular, as a result of oxidation when exposed to air lithium metal LiOH, Li 2 O, Li 2 CO 3 having the oxide film and the like. When the surface oxide film (native layer) exist on the surface, the oxide film serves as a dielectric film to lower the electrical conductivity, to hinder smooth movement of lithium ions occurs a problem that the electric resistance increases. [9] [10] For this reason, in forming a lithium negative electrode, but the reactive surface oxide film formation problems due to the lithium metal is improved some by performing a vacuum deposition process, still in the cell assembly process is exposed to the atmosphere, fundamentally the inhibition of the surface oxide film formed will circumstances impossible to be. Thus, by using the lithium metal, while increasing the energy efficiency to solve the problem of the reactivity of lithium and the development of a lithium metal electrode it can be made simpler than the process are required. [11] [12] [Prior Art Document] Korea Patent Laid-Open Publication No. 10-2016-0052323 No. "lithium battery comprising a lithium electrode, and this" [13] Detailed Description of the Invention SUMMARY [14] As described above, the lithium secondary battery due to the reactivity of lithium metal, and a restriction on the production process, and because the inevitable contact with the city, the oxygen and moisture in the atmosphere, the battery assembly is a problem that the life and performance of the battery decrease have. The present inventors have found out a method capable of preventing the contact with the atmosphere that occurs during assembly resulting in a diverse out research, the battery and completed the present invention. [15] It is therefore an object of the present invention is the process of forming the thin film of lithium of the lithium secondary battery, to provide a performance and an improved rechargeable lithium battery life by preventing contact with air. [16] Problem solving means [17] The positive electrode material mixture in the initial filling process for the present invention operating the lithium secondary battery during assembly, rather than a lithium thin film negative electrode current collector different from each other, to prepare a battery by lamination on a surface of a positive electrode material mixture, since the battery in order to attain the object of the by moving the lithium laminated on the negative electrode collector in the form of a lithium ion, and lithium it can be formed on the negative electrode current collector while the atmosphere and cut off. [18] The present invention specifically provides a lithium secondary battery, it characterized in that the first, according to embodiments, the negative electrode material mixture is a lithium metal, are separated body and the anode current collector, but is located between the positive electrode material mixture and the separator, formed on one surface of the positive electrode material mixture do. [19] Also according to the invention the second embodiment, the negative electrode material mixture is a lithium metal negative electrode collector is full and separated but disposed between the positive electrode material mixture and the separator is formed on one surface of the positive electrode material mixture, between the anode current collector and the separator It provides a rechargeable lithium battery, characterized in that the polymer protective layer is formed. [20] Effects of the Invention [21] The lithium secondary battery according to the present invention can suppress the formation of a surface oxide film from the anode current collector, so the via process of the lithium thin film is formed on the coating to the atmosphere and the blocked state, and therefore oxygen and moisture in the atmosphere of the lithium metal, and , there is an effect that as a result improve the cycle life characteristics. [22] Brief Description of the Drawings [23] 1 is a schematic view of a lithium secondary battery produced according to the first embodiment of the present invention. [24] Figure 2 is when the initial charge of a lithium secondary battery produced according to the first embodiment, the lithium-ion (Li of the present invention + a schematic diagram showing the movement of). [25] Figure 3 is a schematic view after the initial charge of a lithium secondary battery produced according to the first embodiment of the present invention has been completed. [26] Figure 4 is a schematic view of a lithium secondary battery produced according to the second embodiment of the present invention. [27] Best Mode for Carrying Out the Invention [28] Or less, to the accompanying drawings so that the present invention can be easily self having ordinary skill in the art that belong to the reference embodiment will be described in detail. However, the present invention may be embodied in many different forms, and is not limited herein. [29] [30] In the drawing it was used. Like reference numerals designate like elements was omitted, the portion not related to the description in order to clearly describe the present invention, throughout the entire specification. Also, the size and relative sizes of the components shown in the figures may be reduced or exaggerated for clarity of illustration, and are independent from the actual scale. [31] [32] Figure 1 relates to a schematic view of a lithium secondary battery produced according to the first embodiment of the invention, the invention is a positive electrode 10 including a positive electrode current collector 11 and the positive electrode material mixture 12; A negative electrode including a negative electrode current collector 21 and the negative electrode material mixture 22, 20; And the lithium secondary battery comprising a separator 30 and an electrolyte (not shown) interposed therebetween, the negative electrode material mixture 22 as the lithium metal, are separated from the anode current collector 21, cathode mix (12) with, but located between the membrane (30), discloses a lithium secondary battery, characterized in that formed on one surface of the positive electrode material mixture (12). [33] [34] Figure 2 is the time of initial charging of the lithium secondary battery prepared according to the first embodiment, the lithium-ion (Li of the present invention + a schematic diagram showing the movement of a), 3 is made of lithium in accordance with a first embodiment of the present invention a schematic diagram of a secondary battery after the initial charge has been completed. [35] [36] If also described with reference to Fig. 2 and 3, the present invention is to form a lithium metal 22 is applied to the negative electrode active material of a lithium secondary battery in one side of the anode current collector is the positive electrode material mixture (12), not all (21) producing a battery and is presented by the initial charge during cell operation after the movement of lithium ions toward the negative electrode and the lithium negative electrode current collector thin film 22 on 21 is formed. Since more specifically, forming a negative electrode active material of a lithium thin film 22 on one surface of the positive electrode material mixture 12, a lithium thin film 22 is coated on the anode current collector 21 with the atmosphere and the blocked state, the lithium surface oxide film prevent the formation of the can to achieve the object of improving the life characteristics of the lithium secondary battery and characters. [37] [38] The lithium metal is preferred that is formed on the positive electrode material mixture 12 in the form of a thin film, that forming method if the process is laminated or vapor deposition is not particularly limited, for example, electron beam vapor deposition, metal organic chemical vapor deposition, reactive sputtering, high-frequency various deposition method such as sputtering, magnetron sputtering, and be available to, and the like. Since each of the vapor deposition method is illustrated how a known specific description thereof will be omitted herein. [39] [40] Lithium thin film 22 formed on one surface of the positive electrode mixture 12 may be adjusted according to the electrode width to the electrode shape to facilitate manufacture, and specifically it is preferred that a thickness of 1 to 100 ㎛. It is difficult to satisfy the cycle characteristics due to the lack of efficiency of the lithium is less than 1 ㎛, because the problem of reducing the energy density of the lithium increased thickness occurs when it is more than 100 ㎛. [41] [42] The lithium secondary battery is a lithium thin film 22 is coated on lithium metal by applying a current formed on the positive electrode material mixture 12 is moved in the negative electrode current collector phase in the form of lithium ions on the negative electrode current collector (21) prior to use It is formed a cathode. At this time, the initial charge is preferred that is performed in an amount of 0.01 to 0.5C current density from 1 to two times of charging and discharging, the reason is because the shape of the lithium metal is formed on the negative electrode in accordance with the initial charging current density varies. [43] [44] Figure 4 relates to a schematic view of a lithium secondary battery produced according to the second embodiment of the invention, the invention is a positive electrode 10 including a positive electrode current collector 11 and the positive electrode material mixture 12; A negative electrode including a negative electrode current collector 21 and the negative electrode material mixture 22, 20; And the lithium secondary battery comprising a separator 30 and an electrolyte (not shown) interposed therebetween, the negative electrode material mixture 22 as the lithium metal, are separated from the anode current collector 21, cathode mix (12) with, but located between the membrane 30, is formed on one surface of the positive electrode material mixture 12, the anode current collector 21 and the separator 30 between, the polymeric protective layer the lithium secondary according to claim 40 is formed It discloses a battery. [45] [46] The second embodiment of lithium thin film 22 will not be described the same as the first embodiment, a lithium thin film 22 in the above-described. [47] [48] The second polymer protective layer 40, which is additionally introduced in the embodiment is a lithium ion conductive polymer, such as polyethylene oxide (PEO), polyacrylonitrile (PAN), polymethyl methacrylate (PMMA), polyvinylidene pool fluoride (PVDF), polyvinylidene fluoride full-hexafluoropropylene pool Luo (PVDF-HFP), LiPON, Li 3 N, LixLa 1 - x TiO 3 (0

Documents

Application Documents

# Name Date
1 201817034523-STATEMENT OF UNDERTAKING (FORM 3) [13-09-2018(online)].pdf 2018-09-13
2 201817034523-REQUEST FOR EXAMINATION (FORM-18) [13-09-2018(online)].pdf 2018-09-13
3 201817034523-FORM 18 [13-09-2018(online)].pdf 2018-09-13
4 201817034523-FORM 1 [13-09-2018(online)].pdf 2018-09-13
5 201817034523-DRAWINGS [13-09-2018(online)].pdf 2018-09-13
6 201817034523-DECLARATION OF INVENTORSHIP (FORM 5) [13-09-2018(online)].pdf 2018-09-13
7 201817034523-COMPLETE SPECIFICATION [13-09-2018(online)].pdf 2018-09-13
8 201817034523-Verified English translation (MANDATORY) [18-09-2018(online)].pdf 2018-09-18
9 201817034523-Proof of Right (MANDATORY) [18-09-2018(online)].pdf 2018-09-18
10 201817034523-certified copy of translation (MANDATORY) [18-09-2018(online)].pdf 2018-09-18
11 201817034523.pdf 2018-09-26
12 201817034523-OTHERS-240918.pdf 2018-09-28
13 201817034523-OTHERS-240918-1.pdf 2018-09-28
14 201817034523-OTHERS-240918-.pdf 2018-09-28
15 201817034523-Correspondence-240918.pdf 2018-09-28
16 abstract.jpg 2018-10-10
17 201817034523-FORM-26 [12-12-2018(online)].pdf 2018-12-12
18 201817034523-FORM 3 [20-02-2019(online)].pdf 2019-02-20
19 201817034523-FER.pdf 2021-10-18
20 201817034523-Information under section 8(2) [14-02-2022(online)].pdf 2022-02-14
21 201817034523-FORM 3 [14-02-2022(online)].pdf 2022-02-14
22 201817034523-OTHERS [30-03-2022(online)].pdf 2022-03-30
23 201817034523-FER_SER_REPLY [30-03-2022(online)].pdf 2022-03-30
24 201817034523-CLAIMS [30-03-2022(online)].pdf 2022-03-30
25 201817034523-PA [11-11-2022(online)].pdf 2022-11-11
26 201817034523-ASSIGNMENT DOCUMENTS [11-11-2022(online)].pdf 2022-11-11
27 201817034523-8(i)-Substitution-Change Of Applicant - Form 6 [11-11-2022(online)].pdf 2022-11-11
28 201817034523-US(14)-HearingNotice-(HearingDate-29-11-2023).pdf 2023-10-10
29 201817034523-Correspondence to notify the Controller [24-11-2023(online)].pdf 2023-11-24
30 201817034523-Written submissions and relevant documents [08-12-2023(online)].pdf 2023-12-08
31 201817034523-PatentCertificate15-12-2023.pdf 2023-12-15
32 201817034523-IntimationOfGrant15-12-2023.pdf 2023-12-15

Search Strategy

1 SearchHistory201817034523amendedAE_16-03-2023.pdf
2 searchE_05-03-2020.pdf

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