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Quaternary concentration gradient core-shell lithium ion battery positive electrode material and preparation method thereof

A positive electrode material and concentration gradient technology, applied in the field of quaternary concentration gradient core-shell lithium ion battery positive electrode materials and its preparation, can solve the problems of lack of NCMs particle structure and surface stability, reversible capacity and structural stability, etc., Achieve the effects of increasing cycle stability, improving mechanical stability, and increasing bonding strength

Active Publication Date: 2021-01-01
JINGMEN GEM NEW MATERIAL
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  • Application Information

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Problems solved by technology

Therefore, the reversible capacity and structural stability of conventional concentration gradient materials are still unsatisfactory, while effective methods to enhance the structural and surface stability of Ni-rich NCMs particles are still lacking.

Method used

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  • Quaternary concentration gradient core-shell lithium ion battery positive electrode material and preparation method thereof
  • Quaternary concentration gradient core-shell lithium ion battery positive electrode material and preparation method thereof
  • Quaternary concentration gradient core-shell lithium ion battery positive electrode material and preparation method thereof

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preparation example Construction

[0021] see figure 1 , the preparation method of quaternary concentration gradient core-shell lithium ion battery positive electrode material, comprises the following steps:

[0022] (1) prepare the first salt solution containing nickel, cobalt and manganese ( figure 1 In the ternary salt solution A), the mol ratio of nickel ion, cobalt ion, manganese ion in the first salt solution is (90-100): (1-5): (1-5), nickel in the first salt solution The sum of the concentration of ions, the concentration of cobalt ions and the concentration of manganese ions is 2.00mol / L-4.00mol / L, and the first salt solution is placed in the first salt solution tank; the second salt solution containing nickel, cobalt and manganese is prepared. saline solution ( figure 1 The ternary salt solution B) in the salt solution, the mol ratio of nickel ion, cobalt ion, manganese ion in the second salt solution is (20-60): (20-50): (20-50), nickel in the second salt solution The sum of the concentration of i...

Embodiment 1

[0029] (1) prepare the first salt solution and the second salt solution containing nickel sulfate, cobalt sulfate, manganese sulfate, the molar ratio of nickel ion, cobalt ion, manganese ion in the first salt solution is 90:5:5, the first salt The sum of the concentration of nickel ions, the concentration of cobalt ions and the concentration of manganese ions in the solution is 2.00mol / L, and the first salt solution is placed in the first salt solution tank. The molar ratio of nickel ions, cobalt ions and manganese ions in the second salt solution is 60:20:20, and the sum of the concentration of nickel ions, cobalt ions and manganese ions in the second salt solution is 2.00 mol / L.

[0030] (2) take sodium metaaluminate as the aluminum salt solution of raw material preparation 0.2mol / L;

[0031] (3) Add 150L of the first salt solution at a rate of 5L / h to the reactor in a nitrogen atmosphere, and at the same time add sodium hydroxide solution and ammonia solution to the reactor...

Embodiment 2

[0037] (1) prepare the first salt solution and the second salt solution containing nickel sulfate, cobalt sulfate, manganese sulfate, the molar ratio of nickel ion, cobalt ion, manganese ion in the first salt solution is 92:5:3, the first salt The sum of the concentration of nickel ions, cobalt ions and manganese ions in the solution is 2.17mol / L, and the first salt solution is placed in the first salt solution tank. The molar ratio of nickel ions, cobalt ions and manganese ions in the second salt solution is 48:23:30, and the sum of the concentration of nickel ions, cobalt ions and manganese ions in the second salt solution is 2.02mol / L.

[0038] (2) take magnesium sulfate as the magnesium salt solution of raw material preparation 0.3mol / L;

[0039] (3) Add 200L of the first salt solution at a rate of 4L / h to the reactor in a nitrogen atmosphere, and at the same time add sodium hydroxide solution and ammonia solution to the reactor for the first co-precipitation reaction to o...

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Abstract

The invention discloses a quaternary concentration gradient core-shell lithium ion battery cathode material, and the chemical formula of the material is LiNixCoyMn<1-x-y-z>MzO2, wherein x is greater than 0.7 and less than 0.9, y is greater than 0.05 and less than 0.2, z is greater than 0.01 and less than 0.03, and M is one of Al, Cr, Mg, Zn, Mo, Ti and W. The preparation method of the material comprises the following steps: adding a first salt solution containing nickel, cobalt and manganese, a sodium hydroxide solution and an ammonia water solution into a reaction kettle for reaction, and mixing a second salt solution containing nickel, cobalt and manganese with the remaining first salt solution to obtain a mixed solution; adding the mixed solution and the doped salt solution into a reaction kettle, performing centrifugal washing, performing drying, performing screening, removing iron, mixing with lithium hydroxide, and performing roasting to obtain the quaternary concentration gradient core-shell lithium ion battery positive electrode material. According to the invention, the particle core rich in nickel has high capacity, and the surface nickel deficiency (or rich in manganese)has cycling stability and thermal stability.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery cathode materials, in particular to a quaternary concentration gradient core-shell lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries (LIBs) are currently the most promising electric vehicle (EV) energy storage technology and have been widely used. The major disadvantages of LIBs are high cost, insufficient energy density, and poor cycle stability, which are largely limited by cathode materials. Therefore, there is an urgent need to develop cathode materials with high energy density and good cycle stability. Among many positive electrode candidate materials, nickel-rich Li[Ni 1-x-y co x mn y ]O 2 (NCM) layered oxides are the most promising due to their high capacity and low cost. [0003] Usually high nickel cathode material is made of Ni 2+ / 3+ and Ni 3+ / 4+ The oxidation-reduction reaction of ions provides ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M10/0525C01G53/00
CPCH01M4/505H01M4/525H01M4/485H01M10/0525C01G53/006C01P2006/40Y02E60/10
Inventor 范亮姣张坤许开华李聪黎俊孙海波陈康薛晓斐陈小飞
Owner JINGMEN GEM NEW MATERIAL
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