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Positive pole active material for lithium secondary battery and manufacturing method thereof, lithium secondary battery

A cathode active material, lithium secondary battery technology, used in secondary batteries, electrode manufacturing, battery electrodes, etc., can solve the problems of poor cycle characteristics, unstable crystal structure, etc.

Active Publication Date: 2020-10-13
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

[0005] Therefore, the repeated charge-discharge reaction causes the crystal structure to become unstable, and the cycle characteristics will deteriorate
[0006] To solve this problem, the addition of Co and Al to replace LiNiO 2 Part of the Ni material has been studied, but the material to solve this problem has not been obtained, and a Li-Ni based composite oxide with higher crystallinity is required

Method used

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  • Positive pole active material for lithium secondary battery and manufacturing method thereof, lithium secondary battery
  • Positive pole active material for lithium secondary battery and manufacturing method thereof, lithium secondary battery
  • Positive pole active material for lithium secondary battery and manufacturing method thereof, lithium secondary battery

Examples

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preparation example Construction

[0070] Preparation method of positive electrode active material for lithium secondary battery

[0071] According to the preparation method of the lithium secondary battery cathode active material of the present invention, it comprises the following steps: carry out co-precipitation reaction of nickel raw material, cobalt raw material, manganese raw material and heterogeneous element raw material to obtain a precursor; and The precursor and the lithium raw material are mixed and then calcined to obtain the positive electrode active material represented by the chemical formula 1.

[0072] First, the nickel raw material, the cobalt raw material, the manganese raw material, and the different element raw material are mixed with a solvent by a co-precipitation reaction, and mixed to satisfy a stoichiometric ratio. A precipitant may be further mixed.

[0073] The nickel raw material is a combination of nickel cations and arbitrary anions, and is not particularly limited as long as i...

Embodiment 1

[0126] (1) Preparation of positive electrode active material

[0127] Measure NiSO 4 *6H 2 O. CoSO 4 *7H 2 O, MnSO 4 *H 2 O was then dissolved in distilled water to make the content of the precursor the same as in Example 1 in Table 1 below. The dissolved metal hydroxide solution reacts with ammonia and sodium hydroxide in the reactor to precipitate.

[0128] The precipitated slurry was washed with water and separated from solid and liquid with a filter press, and the residual moisture was removed with high-pressure fresh air (Fresh Air).

[0129] The solid-liquid separated active material was dried at 150° C. with a fluidized bed dryer. After combining the dry precursor with Li 2 CO 3 After mixing, 4.0kg of the mixed precursor was filled into a refractory saggar (saggar) made of mullite, and then in the calciner in the air environment and at a calcination temperature of 800°C, the temperature was increased by 3.0°C / min. Calcined at a high speed. Then, the mixture w...

Embodiment 2

[0134] In addition to measuring NiSO 4 *6H 2 O. CoSO 4 *7H 2 O, MnSO 4 *H 2 After O was dissolved in distilled water to make the content of the precursor the same as in Example 2 in Table 1 below, a positive electrode active material was prepared under the same conditions as in Example 1. In addition, a lithium secondary battery was produced under the same conditions as in Example 1.

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PUM

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Abstract

A positive pole active material for a lithium secondary battery comprising a compound represented by the following chemical formula 1 is disclosed. [Chemical formula 1] Li<1+m>Ni<1-w-x-y-z>Co<w>Mn<x>M1<y>M2<z>O<2-p>X (in chemical formula 1, M1 and M2 are different from each other, is any one element selected from a group consisting of Al, Mg, Zr, Sn, Ca, Ge, Ti, Cr, Fe, Zn, Y, Ba, La, Ce, Sm, Gd, Yb, Sr, Cu and Ga, respectively, X is any one element selected from a group consisting of F, N, S, and P, and w, x, y, z, p, and m are 0.125<w<0.202, 0.153<x<0.225, 0<=y<=0.1, 0<=z<=0.1, 0.34<=w+x<=0.36, 0<=p<=0.1, -0.l<=m<=0.2, respectively.)

Description

technical field [0001] The present disclosure relates to a good precursor of positive electrode active material of lithium secondary battery, positive electrode active material of lithium secondary battery and lithium secondary battery. Background technique [0002] In recent years, with the rapid development of portability and wirelessization of electronic equipment such as AV equipment and PCs, the demand for small, lightweight secondary batteries with high energy density is increasing as a driving power source for these equipment. In addition, in recent years, electric vehicles and hybrid vehicles have been developed and put into practical use for the sake of the global environment, so there is an increasing demand for lithium-ion secondary batteries with good storage performance in medium and large sizes. Under such circumstances, a lithium ion secondary battery having a large charge and discharge capacity and an advantage in lifespan has attracted attention. [0003] C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505C01G53/00H01M10/052
CPCH01M10/052C01G53/00Y02E60/10C01G53/50C01G53/006C01P2004/61C01P2004/62C01P2004/50C01P2004/03H01M4/0471H01M2004/028H01M4/131H01M4/50H01M4/523H01M4/525H01M4/505H01M10/0525
Inventor 闵盛焕金祯汉宋定勋
Owner 浦项控股股份有限公司