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A kind of lithium-ion battery layered cathode material and preparation method thereof

A technology for lithium ion batteries and positive electrode materials, which is applied in the field of layered positive electrode materials for lithium ion batteries and their preparation, can solve the problems of material structure deterioration, performance degradation, lack of lattice lithium, etc., and achieves stable crystal structure and surface residual alkali content. Low, easy to scale production effect

Active Publication Date: 2019-10-18
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water washing is an effective way to reduce the residual alkali on the surface, but it often leads to the loss of lattice lithium on the surface, resulting in the deterioration of the structure of the material after water washing and serious performance attenuation.

Method used

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  • A kind of lithium-ion battery layered cathode material and preparation method thereof

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Effect test

Embodiment 1

[0021] A preparation method of a lithium-ion battery layered positive electrode material, comprising the following steps:

[0022] S1, the Ni 0.8 co 0.1 mn 0.1 (OH) 2 , lithium hydroxide monohydrate and nano-alumina are mixed evenly in a high-speed mixer, Li ions and Ni 0.8 co 0.1 mn 0.1 (OH) 2 The molar ratio of nano-alumina and Ni is 1.04:1 0.8 co 0.1 mn 0.1 (OH) 2 The molar ratio is 0.06:1, and the unmodified powder is obtained by sintering at 790°C for 12 hours under pure oxygen atmosphere;

[0023] S2. Stir the unmodified powder with pure water at 60°C for 3 minutes, the mass volume ratio (g / L) of the unmodified powder to water is 1000:1, centrifuge, dry at 100°C, and pulverize to obtain a washed powder ;

[0024] S3. Add lithium dioxalate borate into ethanol to dissolve, then add water-washed powder and mix, the mass ratio of ethanol to water-washed powder is 2:3, then stir and evaporate at 90°C, and sinter at 760°C for 10h under pure oxygen atmosphere to obt...

Embodiment 2

[0027] A preparation method of a lithium-ion battery layered positive electrode material, comprising the following steps:

[0028] S1, the Ni 0.82 co 0.12 mn 0.6 (OH) 2 , lithium hydroxide monohydrate and nano zirconia are mixed evenly in a high-speed mixer, Li ions and Ni 0.82 co 0.12 mn 0.6 (OH) 2 The molar ratio of nano zirconia and Ni is 1.05:1 0.82 co 0.12 mn 0.6 (OH) 2 The molar ratio is 0.01:1, under pure oxygen atmosphere, sintering at 770°C for 20h to obtain unmodified powder;

[0029] S2. Stir the unmodified powder with pure water at 60°C for 3 minutes, the mass volume ratio (g / L) of the unmodified powder to water is 700:1, centrifuge, dry at 100°C, and pulverize to obtain a washed powder ;

[0030] S3. Add lithium dioxalate borate into ethanol to dissolve, then add water-washed powder to mix, the mass ratio of ethanol to water-washed powder is 2:3, then stir and evaporate at 90°C, and sinter at 750°C for 8h under pure oxygen atmosphere to obtain a lithiu...

Embodiment 3

[0033] A preparation method of a lithium-ion battery layered positive electrode material, comprising the following steps:

[0034] S1, the Ni 0.85 co 0.1 mn 0.5 (OH) 2 , lithium hydroxide monohydrate and nano-magnesium oxide are mixed evenly in a high-speed mixer, Li ions and Ni 0.85 co 0.1 mn 0.5 (OH) 2 The molar ratio of 1.03:1, nano magnesium oxide and Ni 0.85 co 0.1 mn 0.5 (OH) 2 The molar ratio is 0.03:1, under pure oxygen atmosphere, sintering at 730°C for 15h to obtain unmodified powder;

[0035] S2. Stir the unmodified powder with pure water at 60°C for 3 minutes, the mass volume ratio (g / L) of the unmodified powder to water is 500:1, centrifuge, dry at 100°C, and pulverize to obtain a washed powder ;

[0036] S3. Add lithium dioxalate borate into ethanol to dissolve, then add water-washed powder and mix, the mass ratio of ethanol to water-washed powder is 2:3, then stir and evaporate at 90°C, and sinter at 710°C for 5h under pure oxygen atmosphere to obtai...

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Abstract

The invention discloses a layered positive electrode material for a lithium-ion battery. The layered positive electrode material comprises a body and a B2O3 coating layer, wherein a chemical formula of the body is Li<x>(NiCoMn<c>)<1-y>M<y>O<2>, wherein x is smaller than or equal to 1.04 and greater than or equal to 0.96, y is smaller than or equal to 0.06 and greater than or equal to 0.01, ais smaller than or equal to 0.9 and greater than or equal to 0.8, a+b+c is equal to 1, and M is selected from at least one of an Al element, a Mg element, a Ti element and a Zr element. The inventionfurther discloses a preparation method of the layered positive electrode material for the lithium-ion battery. The method comprises the following steps of mixing a nickel-cobalt manganese hydroxide,a lithium source and a nano oxide additive evenly and carrying out first sintering to obtain unmodified powder; stirring the unmodified powder and water, carrying out centrifugal separation to obtaina solid material, drying and crushing to obtain washing powder; adding LIBOB to an organic solvent for dissolving, adding the washing powder for mixing, stirring, evaporating and carrying out second sintering to obtain the layered positive electrode material for the lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a layered positive electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] High-capacity layered cathode materials Li(Ni x co y mn z m 1-x-y-z )O 2 (0.6<x<1, 0<y<0.2, 0≤z<0.2), is one of the most widely researched fields in the key technology of lithium-ion batteries. But in layered materials, with Ni 2+ The increase of the nickel content will lead to serious mixing of lithium and nickel during the sintering process, which will affect the coulombic efficiency of lithium ion deintercalation during charge and discharge. The structure is destroyed during the process and reacts with the electrolyte, resulting in poor cycle performance. The main idea to solve such problems is to stabilize the structure by material bulk doping and surface modification to stabilize the interface. Water washing is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M10/0525H01M2004/028Y02E60/10
Inventor 陈龙夏昕李道聪
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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