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Method for preparation of composite anode material of carbon-coated lithium-ion battery

A composite positive electrode material and lithium-ion battery technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of difficult control of material performance consistency, long roasting time, etc., and achieve good discharge cycle stability, short process cycle, The effect of short holding time

Inactive Publication Date: 2012-04-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the above two processes, due to the long firing time, this adverse effect is difficult to control, resulting in difficult control of the performance consistency of the obtained materials

Method used

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  • Method for preparation of composite anode material of carbon-coated lithium-ion battery
  • Method for preparation of composite anode material of carbon-coated lithium-ion battery
  • Method for preparation of composite anode material of carbon-coated lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023](1) According to the molar ratio of lithium carbonate: nickel hydroxide: manganese hydroxide: cobalt hydroxide = 3 / 2: 1: 1: 1, weigh lithium carbonate, nickel hydroxide, manganese hydroxide and cobalt hydroxide, in order To make up for the volatilization loss of lithium during sintering, add 6% excess lithium carbonate of lithium carbonate mass, mix the above materials evenly, add distilled water until the distilled water just submerges the mixed materials, and the ball-to-material ratio of the ball (agate ball) mill is 1.5 ︰1 ball milling for 16 hours;

[0024] (2) Dry the ball-milled material obtained in step (1) at 50°C;

[0025] (3) After the dried material in step (2) was microwave roasted at 970°C for 60 minutes, gray-black LiNi was obtained. 1 / 3 mn 1 / 3 co 1 / 3 o 2 powder;

[0026] (4) To the LiNi obtained in step (3) 1 / 3 mn 1 / 3 co 1 / 3 o 2 Add LiNi to the powder 1 / 3 mn 1 / 3 co 1 / 3 o 2 Glucose and distilled water with 1.5% of the mass of the powder are ba...

Embodiment 2

[0032] (1) According to the molar ratio of lithium carbonate: nickel hydroxide: manganese hydroxide: cobalt hydroxide = 3 / 2: 1: 1: 1, weigh lithium carbonate, nickel hydroxide, manganese hydroxide and cobalt hydroxide, in order To make up for the volatilization loss of lithium during sintering, add 6% excess lithium carbonate of lithium carbonate mass, mix the above materials evenly, add distilled water until the distilled water just submerges the mixed materials, and the ball-to-material ratio of the ball (agate ball) mill is 1.5 ︰1 ball milling for 16 hours;

[0033] (2) Dry the ball-milled material obtained in step (1) at 50°C;

[0034] (3) After the dried material in step (2) was microwave roasted at 970°C for 60 minutes, gray-black LiNi was obtained. 1 / 3 mn 1 / 3 co 1 / 3 o 2 powder;

[0035] (4) To the LiNi obtained in step (3) 1 / 3 mn 1 / 3 co 1 / 3 o 2 Add LiNi to the powder 1 / 3 mn 1 / 3 co 1 / 3 o 2 3% dextrose and distilled water of the powder mass, ball milled until...

Embodiment 3

[0040] (1) According to the molar ratio of lithium carbonate: nickel hydroxide: manganese hydroxide: cobalt hydroxide = 3 / 2: 1: 1: 1, weigh lithium carbonate, nickel hydroxide, manganese hydroxide and cobalt hydroxide, in order To make up for the volatilization loss of lithium during sintering, add 6% excess lithium carbonate based on the mass of lithium carbonate. After mixing the above materials evenly, add distilled water until the distilled water just submerges the mixed materials, and the ball-to-material ratio of ball milling is 1.5: 1 for ball milling 16 Hour;

[0041] (2) Dry the ball-milled material obtained in step (1) at 50°C;

[0042] (3) After the dried material in step (2) was microwave roasted at 970°C for 60 minutes, gray-black LiNi was obtained. 1 / 3 mn 1 / 3 co 1 / 3 o 2 powder;

[0043] (4) To the LiNi obtained in step (3) 1 / 3 mn 1 / 3 co 1 / 3 o 2 Add LiNi to the powder 1 / 3 mn 1 / 3 co 1 / 3 o 2 4% dextrose and distilled water of the powder mass, ball mille...

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Abstract

The invention provides a method for preparation of a composite anode material of a carbon-coated lithium-ion battery, which comprises the following steps: weighing lithium carbonate, nickel hydroxide, manganese hydroxide and cobalt hydroxide with the molar ratio of the lithium carbonate, nickel hydroxide, manganese hydroxide and cobalt hydroxide being (3 / 2):1:1:1, adding excessive lithium carbonate of 6 percent of the mass of the lithium carbonate, mixing the materials, adding distilled water, and milling for 16 hours; drying at 50 DEG C; carrying out microwave roasting for 60 minutes at 830-970 DEG C to obtain ash black LiNi1 / 3Mn1 / 3Co1 / 3O2 powder; adding carbon-containing organic substances and distilled water of 1.5-4 percent of the mass of the LiNi1 / 3Mn1 / 3Co1 / 3O2 powder, milling until the materials are well mixed, and drying at 50 DEG C; and finally carry out microwave roasting to obtain LiNi1 / 3Mn1 / 3Co1 / 3O2 / C powder. Compared with non-carbon-coated LiNi1 / 3Mn1 / 3Co1 / 3O2 powder, the discharge cycle stability of the obtained LiNi1 / 3Mn1 / 3Co1 / 3O2 / C powder is enhanced under high magnification. The power can be used as an anode material to be applied in high-power lithium-ion batteries and power lithium-ion batteries.

Description

technical field [0001] The invention relates to a preparation method of a carbon-coated lithium-ion battery composite positive electrode material, in particular to a microwave method for preparing a carbon-coated lithium-ion battery composite positive electrode material, and belongs to the technical field of battery materials. Background technique [0002] For lithium-ion batteries, the positive electrode material is one of the key factors to improve its performance. The positive electrode ternary material LiNi with high safety and low cost advantages 1 / 3 mn 1 / 3 co 1 / 3 o 2 Much attention, but LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 The disadvantage is that in the case of high-rate charge and discharge, the capacity decays quickly and the rate performance is not good. In view of its shortcomings, the research on carbon coating modification has increasingly become a hot spot pursued by researchers. [0003] Carbon sources (such as glucose, citric acid, sucrose, etc.) can be prepare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505
CPCY02E60/122Y02E60/10
Inventor 张正富彭金辉傅梦笔韩亚梅张利波陶保文蔡静国宋若康
Owner KUNMING UNIV OF SCI & TECH
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