High nickel ternary positive electrode material applied to lithium secondary battery and preparation method thereof

A lithium secondary battery, cathode material technology, applied in the direction of secondary batteries, battery electrodes, electrical components, etc., can solve the problems of poor rate performance and processing performance, poor safety, poor compatibility, etc., to improve the rate performance, good Protective effect and good compatibility

Active Publication Date: 2020-01-14
ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the problems of poor compatibility between existing high-nickel ternary materials and electrolytes, poor cycle performance, rate performance, processability, and poor safety, the present invention provides a method with good processability and excellent electrochemical performance. High-safety, high-nickel ternary cathode material for lithium secondary batteries with good compatibility with electrolyte

Method used

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  • High nickel ternary positive electrode material applied to lithium secondary battery and preparation method thereof
  • High nickel ternary positive electrode material applied to lithium secondary battery and preparation method thereof
  • High nickel ternary positive electrode material applied to lithium secondary battery and preparation method thereof

Examples

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Embodiment 1

[0041] (1) Nickel salt (NiSO 4 ·6H 2 O), cobalt salt (CoSO 4 ·7H 2 O), manganese salt (MnSO 4 ·H 2 O) According to the ratio of Ni:Co:Mn=0.8:0.1:0.1, it is configured into aqueous solution A, sodium hydroxide and ammonia water are configured into mixed solution B as precipitating agent and complexing agent, and two kinds of solutions of A and B are mixed by peristaltic pump Pump it into the reaction kettle, control the pH of the mixed solution in the reaction kettle to 11.5, the temperature is 50°C, and the stirring speed is 1000r / min. The precursor of high-nickel ternary cathode material is synthesized by co-precipitation method, and then aged and filtered , washed and dried to get Ni 0.8 co 0.1 mn 0.1 (OH) 2 High-nickel ternary cathode material precursor;

[0042] (2) get the Ni prepared in the above-mentioned steps (1) 0.8 co 0.1 mn 0.1 (OH) 2 , add the corresponding amount of LiOH and surface gradient doping Mg(NO 3 ) 2 In the aqueous solution, make the mola...

Embodiment 2

[0048] The difference between Example 2 and Example 1 is that in step (2), the molar ratio Li in the mixed raw material: Ni: Co: Mn: Mg=1.02:0.8:0.1:0.1:0.02, the chemical formula is Li 1.02 Ni 0.8 co 0.1 mn 0.1 Mg 0.02 o 2 base material to obtain Li 1.02 Ni 0.8 co 0.1 mn 0.1 Mg 0.02 o 2 @C@LiAlO 2 High-nickel ternary positive electrode materials for lithium secondary batteries, and the rest of the steps are exactly the same as the process conditions.

Embodiment 3

[0050] The difference between embodiment 3 and embodiment 1 is: in step (3), get 0.003mol aluminum isopropoxide and 0.003mol lithium acetate and dissolve in ethanol solution, obtain Li 1.02 Ni 0.8 co 0.1 mn 0.1 Mg 0.01 o 2 @C@LiAlO 2 High-nickel ternary positive electrode materials for lithium secondary batteries, and the rest of the steps are exactly the same as the process conditions.

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Abstract

The invention relates to the technical field of lithium ion batteries. In order to solve the problems of poor compatibility and poor cycle performance, rate performance, processability, and safety ofexisting high nickel ternary materials and electrolytes, the invention provides a high nickel ternary positive electrode material applied to a lithium secondary battery and a preparation method thereof. The high nickel ternary positive electrode material applied to the lithium secondary battery comprises a base material and a composite coating layer outside the base material. The chemical formulaof the base material is Li1.02Ni1-x-yCoxMnyMZO2. M is selected from the group consisting of Al, Mg, Ti, and Si. (1-x-y), x, y, and z are the molar ratios of Ni, Co, Mn, and M respectively. (1-x-y) isgreater than or equal to 0.6 and less than 1. x is greater than 0 and less than 0.4. y is greater than 0 and less than 0.4. z is greater than 0 and less than or equal to 0.02. According to the invention, the high nickel ternary positive electrode material applied to the lithium secondary battery has the advantages of low surface alkalinity, good processability, excellent electrochemical performance, high safety, and good compatibility with electrolytes; and the battery made of the material has the advantages of significantly improved cycle life and excellent electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-nickel ternary positive electrode material for lithium secondary batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have high energy density and cycle efficiency, high operating voltage, low self-discharge, and no memory effect, and have broad application prospects in new energy vehicle power batteries. At present, the energy density of commercial lithium-ion batteries is not high, which limits the cruising range of new energy vehicles, thus seriously restricting the rapid development and comprehensive popularization of electric vehicles. It is predicted that when the energy density of a single power battery reaches 300Wh / kg, the mileage of a single charge can reach 470 kilometers, basically solving the problem of mileage anxiety for consumers; when the energy density of a single power battery reaches 400Wh / kg, one...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 武建飞李洪涛常林荣吴移照陈单陈玉莲
Owner ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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