Method for preparing modified anode material of lithium ion battery

A technology for lithium-ion batteries and cathode materials, which is applied in the field of preparation of lithium-ion battery materials, can solve the problems of rapid cycle performance decay, large material capacity loss, structural changes, etc. performance effect

Inactive Publication Date: 2006-07-19
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiNiO 2 with LiCoO 2 With the same structure, its high specific capacity, no pollution, and abundant resources, is an ideal substitute, but it is difficult to synthesize, the structure will change during charging and discharging, etc.
LiNi 1-x co x o 2 is LiNiO 2 with LiCoO 2 The solid solution has the advantages of the two materials at the same time, but the capacity loss of the first charge and discharge material is large, and the cycle performance decays quickly

Method used

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  • Method for preparing modified anode material of lithium ion battery
  • Method for preparing modified anode material of lithium ion battery
  • Method for preparing modified anode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put the metal salt or metal hydroxide and the positive electrode material of lithium ion battery into a conventional amount of organic solvent for mechanical mixing treatment, pretreatment at low temperature, and then roasting at high temperature to synthesize M y o z ·LiCoO 2 (M y o z ·LiNi x co 1-x o 2 ) Lithium-ion battery positive electrode material; the ratio of metal salt or metal hydroxide to the positive electrode material is measured and dosed according to the molar ratio of 0.01 to 0.05; the specific steps are as follows: aluminum isopropoxide and LiCoO 2 Weighing is carried out according to the molar ratio of 0.1:100. First, the aluminum salt is added to a conventional amount of citric acid, and the ethylene glycol solution is stirred at 90 ° C. At the same time, the LiCoO 2 Slowly add to the solution until it becomes a gel. The mixture of gel, acetone and ethanol (1:1) was ball-milled in a stainless steel ball mill tank for 4 hours according to the ma...

Embodiment 2

[0028] Magnesium acetate and LiCoO 2 Weigh according to the molar ratio of 0.01:100. Magnesium acetate was added to the mixed solution of citric acid and ethylene glycol and stirred at 85°C, while the LiCoO 2 Slowly add to the solution until it becomes a gel. Gel and acetone were ball-milled in an agate ball mill jar for 8 hours according to the mass ratio of 10:1, and the gel after ball-milling was vacuum-dried at 100°C for 3 hours, then calcined at 500°C for 8 hours, and cooled in a furnace to obtain 0.01MgO ·LiCoO 2 Cathode material. The composite material was taken out, and its phase structure was analyzed, from image 3 It can be seen that the crystal structure of the material has not changed, and the layered structure is still maintained. The electrochemically active assembly conditions and test conditions of the sample are consistent with Example 1, and the cycle capacity test curve is shown in Figure 4 .

Embodiment 3

[0030] Aluminum hydroxide and LiNi 0.8 co 0.2 o 2 Weigh according to the molar ratio of 0.04:100. Add aluminum hydroxide to citric acid and ethylene glycol solution and stir at 80°C, while LiNi 0.8 co 0.2 o 2Slowly add to the solution until it becomes a gel. The mixture of gel, acetone and ethanol (4:1) was ball milled in a stainless steel ball mill jar for 6 hours according to the mass ratio of 10:1, and the gel after ball milling was vacuum-dried at 100°C for 1 hour, and then baked at 600°C for 12 hours Afterwards, cooling with the furnace was carried out to obtain 0.02Al 2 o 3 ·LiNi 0.8 co 0.2 o 2 Cathode material. The composite material was taken out, and its phase structure was analyzed, from Figure 5 It can be seen that the crystal structure of the material has not changed, and the layered structure is still maintained. The electrochemically active assembly conditions and test conditions of the sample are consistent with Example 1, and the cycle capacity te...

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Abstract

The preparation method for modified anode material in lithium ion cell comprises: (1) dispersing the metal salt or metal hydroxides into organic solvent, stirring at 80-90Deg, and adding LiCoO2 (LiNi(1-x)CoxO2, x=0.2 / 0.3) to form gel; (2) grinding the gel in tank for 4-8h; wherein, adding acetone, alcohol or mixed liquid by mass ratio as 10:1~20:1, and the mole measurement ratio of MyOz / LiCoO2(LiNi(1-x)CoxO2, x=0.2 / 0.3) as 0.01-0.05; (3) drying the grinded gel for 1-3h at 80-100Deg, and removing the organic solvent; (4) constant-temperature calcining the gel in muffle furnace for 6-12h at 400-600Deg, cooling naturally and obtaining the MyOzíñLiCoO2 (MyOzíñLiNixCo(1-x)O2, x=0.2 / 0.3). This invention improves the product cycle performance.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery material, in particular to a preparation method of a modified lithium ion battery positive electrode material. Background technique [0002] Since the invention of lithium-ion secondary batteries in 1990, cathode materials, as an important part of this power supply, have played a vital role in the performance of lithium-ion batteries. Lithium transition metal oxides such as LiCoO 2 , LiMn 2 o 4 , LiNiO 2 、LiNi 1-x co X o 2 (x=0-0.5), etc., are generally used as positive electrode materials for lithium-ion batteries. Among the above lithium-ion battery cathode materials, LiCoO 2 It is the most successful type of commercialization at present. Due to the structure, only half of the lithium ions can be extracted, so it is only 50% of the theoretical capacity. LiNiO 2 with LiCoO 2 With the same structure, it has high specific capacity, no pollution, and abundant resources. It ...

Claims

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Application Information

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IPC IPC(8): C01G51/00C01G53/00C01D15/00H01M4/36H01M4/58H01M4/525
CPCY02E60/10
Inventor 李鹏张绍丽周波
Owner TIANJIN LISHEN BATTERY
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