Lithium battery positive electrode material and preparation method thereof

A cathode material, lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem that nickel-cobalt-manganese ternary materials are difficult to achieve cycle performance, thermal stability performance and electrochemical performance, etc. The effect of low cost, high cycle performance

Inactive Publication Date: 2014-07-02
HUIZHOU BYD BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the technical problem that there are obvious boundaries inside the nickel-cobalt-manganese ternary material in the prior art, and it is difficult to achieve better cycle performance, thermal stability performance and electrochemical performance

Method used

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  • Lithium battery positive electrode material and preparation method thereof
  • Lithium battery positive electrode material and preparation method thereof
  • Lithium battery positive electrode material and preparation method thereof

Examples

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preparation example Construction

[0018] The invention provides a method for preparing a positive electrode material of a lithium battery, comprising the following steps:

[0019] S1. Pump solution A and alkali solution into the reaction vessel at the same speed to carry out co-precipitation reaction;

[0020] S2. While step S1 is being performed, pump solution B into solution A at a constant speed, and dry to obtain a precursor after the reaction is terminated;

[0021] S3, mixing the precursor obtained in step S2 with a lithium salt, and sintering to obtain the positive electrode material of the lithium battery;

[0022] The solution A is a mixed solution containing water-soluble nickel salt, water-soluble manganese salt and water-soluble cobalt salt, wherein the molar ratio of Ni, Co, and Mn=(1-2x):x:x, where 0

[0023] The solution B is a mixed solution containing water-soluble nickel salt, water-soluble manganese salt and water-soluble cobalt salt, wherein the molar ratio of Ni, Co, and Mn=(1-2...

Embodiment 1

[0041] (1) if figure 1 As shown, the solution A1 of 2mol / L is charged in the second container 2, and the solution A1 is an aqueous solution of nickel sulfate, manganese sulfate and manganese sulfate, and the molar ratio Ni:Co:Mn=8:1:1; A container 1 is filled with 2mol / L solution B1, the solution B1 is an aqueous solution of nickel sulfate, manganese sulfate and manganese sulfate, the molar ratio Ni:Co:Mn=4:3:3; the volume of solution A2 and solution B2 same. Into the third container 3, the alkali solution is loaded, the alkali solution is a mixed system of sodium hydroxide and ammonia water, the concentration of sodium hydroxide in the alkali solution is 2mol / L, and the concentration of ammonia water is 1mol / L.

[0042] (2) First, the solution A1 contained in the second container 2 and the alkali solution contained in the third container 3 are respectively pumped into the reaction container 4 at a constant speed by the pump 6 for reaction, and at the same time, the solution ...

Embodiment 2

[0045] The same steps as in Example 1 were used to prepare the lithium battery positive electrode material S20 of this example, except that:

[0046] In step (1), solution A2 is an aqueous solution of nickel nitrate, manganese nitrate and manganese nitrate, the molar ratio Ni:Co:Mn=5:2.5:2.5, the concentration of solution A2 is 3mol / L; solution B2 is nickel nitrate, nitric acid The aqueous solution of manganese and manganese nitrate, the molar ratio Ni:Co:Mn=1:4.5:4.5, the concentration of solution B2 is 0.6mol / L; the volume of solution A2 and solution B2 is the same.

[0047] Through the above steps, the co-precipitation precursor S2 of the present embodiment (its chemical formula is Ni 0.44 co 0.28 mn 0.28 (OH) 2 ) and lithium battery cathode material S20 (its chemical formula is LiNi 0.44 co 0.28 mn 0.28 o 2 ).

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Abstract

The invention provides a lithium battery positive electrode material and a preparation method thereof. The preparation method of the lithium battery positive electrode material comprises the following steps: S1. pumping a solution A and an alkali solution into a reaction vessel at a constant speed to carry out co-precipitation reaction; S2. pumping a solution B into the solution A at the constant speed while performing the step S1, and drying after the reaction is ended to obtain a precursor; S3. mixing and firing the precursor with lithium salt. In the solution A, a mole ratio of Ni to Co to Mn is (1-2x):x:x, and x is greater than 0 and less than or equal to 0.25. In the solution B, a mole ratio of Ni to Co to Mn is (1-2y):y:y, and y is greater than or equal to 0.25 and less than 0.5; the solution A is different from the solution B; the alkali solution is an aqueous solution which contains a precipitating agent and a complexing agent; the precipitating agent is selected from one or more of water-soluble hydroxides; the complexing agent is ammonia water. The lithium battery positive electrode material has the advantages of high capacity, high heat stability, high cycle performance, high electrochemical performance and low cost.

Description

technical field [0001] The invention belongs to the field of lithium ion secondary batteries, and in particular relates to a lithium battery cathode material and a preparation method thereof. Background technique [0002] Due to LiCoO 2 , LiNiO 2 , LiMnO 2 There is a strong complementarity in structure and performance, and the development of binary or ternary composite cathode materials to improve the electrochemical performance of materials has become the main direction of research. Simultaneous introduction of Co and Mn into LiNiO 2 LiNi formed in the layered structure 1-x-y co x mn y o 2 Ternary transition metal composite oxides showed a higher performance than LiCoO 2 More excellent electrochemical performance, considered to be the most likely to replace LiCoO 2 positive electrode material. [0003] High-nickel materials in nickel-cobalt-manganese ternary materials have poor thermal stability due to the presence of high-priced tetravalent nickel elements on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131
CPCY02E60/122H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 胡栋杰李世彩
Owner HUIZHOU BYD BATTERY
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