Cathode Material For Lithium Secondary Battery, Fabrication Method Therefor, Cathode Comprising Same For Lithium Secondary Battery, And Lithium Secondary Battery
Cathode Material For Lithium Secondary Battery, Fabrication Method Therefor, Cathode Comprising Same For Lithium Secondary Battery, And Lithium Secondary Battery
Abstract:
The present invention relates to a cathode material comprising: a first cathode active material represented by the following Chemical Formula 1; and a second cathode active material represented by the following Chemical Formula 2 and having a single particle morphology, wherein a lithium impurity on the second cathode active material is in an amount of 0.14 % by weight or less on the basis of the total weight of the second cathode active material at least one of Ni, Co, or Mn included in the second cathode active material exhibits a concentration gradient that gradually changes from the center of the particle to the surface, a method for fabricating the cathode material, a cathode comprising the cathode material for a lithium secondary battery, and a lithium secondary battery: [Chemical Formula 1] LiCo1-aM1aO2 wherein M1 is at least one selected from the group consisting of Al, Ti, Mg, and Zr, and 0≤a≤0.2; and [Chemical Formula 2] LiNibCocMndM2eO2 wherein M2 is at least one selected from the group consisting of Al, Ti, Mg, Zr, Y, Sr, and B, and 0
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Notices, Deadlines & Correspondence
LG Chem Research Park, 188, Munji-ro,
Yuseong-gu,
Daejeon 34122
2. YOO, Tae Gu
LG Chem Research Park, 188, Munji-ro,
Yuseong-gu,
Daejeon 34122
3. HWANG, Jin Tae
LG Chem Research Park, 188, Munji-ro,
Yuseong-gu,
Daejeon 34122
4. JUNG, Wang Mo
LG Chem Research Park, 188, Munji-ro,
Yuseong-gu,
Daejeon 34122
5. PARK, Sung Bin
LG Chem Research Park, 188, Munji-ro,
Yuseong-gu,
Daejeon 34122
Specification
The present invention relates to a lithium secondary battery positive electrode material, the positive electrode material production method for a lithium secondary battery positive electrode comprising the positive electrode material, and a lithium secondary battery comprising the same.
BACKGROUND
[5]
There is demand for secondary batteries as an energy source is rapidly increasing as the development of technology and the demand for mobile devices increases. The secondary battery has a high energy density and voltage, long cycle life, self-discharge rate are commercially available and widely used low-lithium secondary battery.
[6]
In recent years, it has become a research want to shorten the high capacity and the charge and discharge time of the lithium secondary battery actively.
[7]
In a conventional battery charging method is a charging constant current (CC) for performing the charge with a constant current from the start to the completion of charging mode, constant voltage (CV) method to perform the charging at a constant voltage from charged initially to the full charge, and the charge initially constant charging current, charging the late constant current to perform the charging at a constant voltage - has a constant-voltage (CC-CV) method is used. The constant current method is charged initially the voltage difference is large large current flows, the greater the charge current, but the advantage of the charge time shorter, there is a problem that lowering the charging efficiency and the battery life shortened if filled with a large charging current. Further, the constant voltage method when the battery charge is completed, is changed largely by the heat generation of the terminal voltage and the battery temperature change, it is difficult to preset a constant voltage value, there is a problem that the charging time longer accordingly.
[8]
Thus, the charging method is currently the most common is the constant current-constant voltage method a. If the battery is discharged a lot, a method of preventing overcharge by carrying out charging at a constant voltage at the point that while performing the charging with the constant current charging is substantially completed.
[9]
Conventional positive electrode active material of a lithium secondary battery is being used a lot of lithium transition metal complex oxide, among these LiCoO 2 Li-Co complex metal oxide, such as is even at a high current as the operation voltage is high, and desorbing lithium ions in high-speed charge effectively It can react it can provide excellent charging efficiency anode. However, the LiCoO 2 has since due to destabilization of the crystal structure of the de-lithium in poor thermal properties, particularly high cobalt limitation in using large quantities as a power source in fields such as electric cars. Furthermore, the LiCoO 2 is current-there has been a problem that, while if the fast-charge to more than 1.0 C-rate, using a constant voltage method, since the voltage soon reaches the upper limit, increased CV charging segment ratio, the longer the charging time.
[10]
Thus, while increasing the price competitiveness, there is a thermal property is excellent, 1.0 C-rate or more high-speed charging, CV ratio developed positive electrode that can shorten the charging time by reducing the material of the filling period is required.
Detailed Description of the Invention
SUMMARY
[11]
In order to solve the above problems, a first object of the present invention is to provide a lithium secondary battery positive electrode material that can reduce the fast filling time during fast-charging at a low cost.
[12]
The second object of the present invention is to provide a method for producing the positive electrode material.
[13]
The third object of the present invention is to provide a lithium secondary battery positive electrode comprising the positive electrode material.
[14]
The fourth object of the present invention is to provide a lithium secondary battery, which may include the positive electrode for a lithium secondary battery, and has excellent high temperature performance, and reduce the fast-charge upon charging time.
Problem solving means
[15]
The present invention includes a first cathode active material represented by the following general formula (1); And displaying by the following formula (2) and the second positive electrode active material having a single particle type; wherein a, the second lithium impurity amount of the positive electrode active material surface of the second cathode active material is not more than 0.14% by weight based on the total amount, the second positive electrode at least one of Ni, Co or Mn contained in the active material provides a will represent the gradient of which changes gradually from the center to the surface of the particle, an anode material:
[16]
Formula 1
[17]
LiCo 1 - aM 1 aO 2
[18]
[Formula 2]
[19]
LiNi bCo cMn dM 2 eO 2
[20]
In Formula 1, M 1 is at least one or more selected from the group consisting of Al, Ti, Mg, and Zr, 0
Documents
Application Documents
#
Name
Date
1
202017004743.pdf
2020-02-04
2
202017004743-STATEMENT OF UNDERTAKING (FORM 3) [04-02-2020(online)].pdf
2020-02-04
3
202017004743-POWER OF AUTHORITY [04-02-2020(online)].pdf
2020-02-04
4
202017004743-FORM 1 [04-02-2020(online)].pdf
2020-02-04
5
202017004743-DRAWINGS [04-02-2020(online)].pdf
2020-02-04
6
202017004743-DECLARATION OF INVENTORSHIP (FORM 5) [04-02-2020(online)].pdf