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Lithium battery cathode material and preparation method thereof

A positive electrode material and lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low initial efficiency and difficulty in achieving cycle performance, achieve high capacity, improve initial efficiency, and ensure thermal stability.

Active Publication Date: 2015-02-11
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Lithium battery cathode material and preparation method thereof
  • Lithium battery cathode material and preparation method thereof
  • Lithium battery cathode material and preparation method thereof

Examples

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preparation example Construction

[0021] The invention provides a method for preparing a positive electrode material of a lithium battery, comprising the following steps:

[0022] S1, first pump the solution A and the alkali solution into the reaction vessel at the same speed, and carry out the co-precipitation reaction;

[0023] S2. After step S1 is carried out for 5-25 hours, pump solution B into solution A at a constant speed, and pump the whole mixed solution and alkali solution into the reaction vessel at a constant speed while pumping solution B, and continue the co-precipitation reaction;

[0024] S3. After step S2 is completed, the solution C and the alkali solution are pumped into the reaction container at a constant speed, and the co-precipitation reaction is continued, and the precursor is obtained by drying after the reaction is terminated;

[0025] S4. Mix the precursor obtained in step S3 with lithium salt, and obtain the lithium battery positive electrode material after sintering;

[0026] The ...

Embodiment 1

[0055] (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 cobalt sulfate, and the molar ratio Ni:Co:Mn=8:1:1; A container 1 is filled with 2mol / L solution B1, which is an aqueous solution of nickel sulfate, manganese sulfate and cobalt sulfate, and the molar ratio Ni:Co:Mn=4:3:3. Load alkaline solution into the third container 3, the alkaline solution is a mixed system of sodium hydroxide and ammoniacal liquor, the concentration of sodium hydroxide in the alkaline solution is 2mol / L, and the concentration of ammoniacal liquor is 1mol / L;

[0056] (2) Turn off the first pump 6, turn on the second pump 7 and the third pump 8, and pump the solution A1 in the second container 2 and the alkali solution in the third container 3 into the reaction container 4 at the same speed The reaction is carried out in the middle, and the reaction time is 10h; At this moment,...

Embodiment 2

[0061] The same steps as in Example 1 were used to prepare the lithium battery positive electrode material S20 of this example, except that:

[0062] In step (1), solution A2 is an aqueous solution of nickel nitrate, manganese nitrate and cobalt 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 cobalt nitrate, the molar ratio Ni:Co:Mn=1:4.5:4.5, the concentration of solution B2 is 0.6mol / L;

[0063] In step (2), the reaction time is 15 hours; at this time, the remaining solution A2 in the second container 2 is equal to the volume of the solution B2 contained in the first container 1;

[0064] In step (3), the reaction time is 2h;

[0065] In step (4), the solution C2 is a 3mol / L cobalt nitrate solution; the reaction time is 2h.

[0066] Through the above steps, the co-precipitation precursor S2 (its chemical formula is Ni 0.48 co 0.27 mn 0.25 (OH) 2 ) and...

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Abstract

The invention provides a lithium battery cathode material and a preparation method thereof. The preparation method comprises the following steps: S1, performing coprecipitation reaction on a solution A and an alkali solution for 5-25 h; S2, pumping a solution B into the solution A at a constant speed, and continuing to perform coprecipitation reaction on the whole mixed solution and the alkali solution when the solution B is pumped; S3, continuing to perform coprecipitation reaction on a solution C and the alkali solution, and drying the obtained precursor after the reaction is terminated; and S4, mixing the precursor with a lithium salt, and sintering to obtain the lithium battery cathode material. The molar ratio of Ni, Co and Mn in the solution A is equal to (1-2x):x:x, and 0<x<=0.25; the molar ratio of Ni, Co and Mn in the solution B is equal to (1-2y):y:y, and 0.25<=y<0.5; and the solution C is an aqueous solution of a cobalt salt. The provided lithium battery cathode material has the advantages of high capacity, high heat stability, high cycle performance, high electrochemical performance and low cost, and has the first efficiency up to 92% or more.

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): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 胡栋杰李世彩
Owner BYD CO LTD
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