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Cathode active material, method for preparing same, and lithium secondary battery comprising same

A technology of positive electrode active materials and secondary particles, which is applied in the direction of secondary batteries, lithium batteries, active material electrodes, etc., can solve the problems of thermal stability reduction and achieve thermal stability improvement, decomposition reaction suppression, and calorific value reduction Effect

Pending Publication Date: 2021-06-18
浦项控股股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, for the ternary NCM system, the higher the Ni content, the lower the thermal stability

Method used

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  • Cathode active material, method for preparing same, and lithium secondary battery comprising same
  • Cathode active material, method for preparing same, and lithium secondary battery comprising same
  • Cathode active material, method for preparing same, and lithium secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] (embodiment 1) preparation Ni is the cathode active material of 88mol%

[0066] 1) Preparation of metal salt solution

[0067] First, NiSO is used as a nickel raw material 4 ·6H 2 O, using CoSO as a cobalt raw material 4 ·7H 2 O, using MnSO as a manganese raw material 4 ·H 2 O, to prepare two metal salt solutions with different concentrations of Ni, Co and Mn.

[0068] For the first metal salt aqueous solution used to form the inner core, the raw materials are mixed in distilled water to satisfy (Ni 0.98 co 0.01 mn 0.01 )(OH) 2 stoichiometric molar ratio.

[0069] Independently of this, for the second metal salt solution used to form the shell, the respective raw materials were mixed in distilled water to satisfy (Ni 0.64 co 0.23 mn 0.13 )(OH) 2 stoichiometric molar ratio.

[0070] 2) Co-precipitation process

[0071] A co-precipitation reactor in which two metal salt solution supply tanks are connected in series is prepared, and the respective metal...

Embodiment 2

[0084] (embodiment 2) preparation Ni is the cathode active material of 88mol%

[0085] The positive electrode active material is prepared by the same method as in Example 1, except the following points: when preparing the raw material, the raw material satisfies (Ni 0.88 co 0.095 mn 0.025 )(OH) 2 The molar ratio; in the co-precipitation process, the pH of the reaction is adjusted to 11.2 during the reaction, and the pH is adjusted to the range of 11.8 before the end of the reaction time point 1 hour; and the pH adjustment speed is adjusted to 0.01pH / min .

Embodiment 3

[0086] (embodiment 3) preparation Ni is the cathode active material of 88mol%

[0087] The positive electrode active material is prepared by the same method as in Example 2, except the following points: in the co-precipitation process, the pH of the reaction is adjusted to 11.2 during the reaction, and the pH is adjusted to 11.2 before the end of the reaction time point 1 hour. 11.6 range; and adjusting the pH adjustment speed to 0.0066 pH / minute.

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Abstract

The present invention relates to a cathode active material, a method for preparing same, and a lithium secondary batter comprising same. The present invention can provide a cathode active material, which has lithium metal oxide particles in the form of secondary particles each comprising primary particles, wherein the surface of the secondary particle comprises plate-shaped primary particles each satisfying that the smaller angle of the angles between the c axis of the plate-shaped primary particle and a straight line connecting an imaginary point of the center of the plate-shaped primary particle and the center point of the secondary particle is 70-90 DEG.

Description

technical field [0001] The present invention relates to a positive electrode active material, a preparation method thereof and a lithium secondary battery containing the same. Background technique [0002] In recent years, with the explosive growth of demand for IT mobile devices and small electric drive devices (electric bicycles, small EVs, etc.) , High energy density secondary battery research and development. [0003] In order to prepare such high-capacity batteries, high-capacity cathode materials need to be used. [0004] Among the existing layered cathode active materials, the material with the highest capacity is LiNiO 2 (275 mAh / g), but it is prone to structural collapse during charging and discharging, and the thermal stability caused by the oxidation number problem is low, so it is actually difficult to commercialize. [0005] To solve such problems, the unstable Ni sites must be replaced by other stable transition metals (Co, Mn, etc.), for which a ternary NCM...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M10/052C01G53/00
CPCY02E60/10C01P2002/52C01P2004/03C01P2004/61C01P2004/04C01P2006/40C01G53/00C01G53/42H01M4/483H01M2004/028H01M4/366H01M4/525H01M4/505H01M10/052C01G53/44C01G53/50C01P2004/84H01M10/0525
Inventor 崔权永李尚奕朴锺一宋定勋南相哲
Owner 浦项控股股份有限公司
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