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Preparation method of lithium ion battery anode material

A lithium-ion battery, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of unstable structure and poor cycle performance, and achieve improved mass specific capacity, better cycle performance, and cycle capacity maintenance. rate increase effect

Inactive Publication Date: 2010-06-16
SHENZHEN BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although LiCoO 2 The performance is superior to other positive electrode materials, but after a long-term cycle, the layered structure will transform into a cubic spinel structure, and after the formation of cubic spinel, the structure is unstable and the cycle performance is not good

Method used

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  • Preparation method of lithium ion battery anode material
  • Preparation method of lithium ion battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Will Co 3 o 4 、Al 2 (SO 4 ) 3 , and Li 2 CO 3 According to the chemical formula LiAl x co 1-x o 2 Mole ratio n(Li 2 CO 3 ):n(Al 2 (SO 4 ) 3 ):n(Co 3 o 4 )=1:x:[2(1-x) / 3] Take the corresponding above-mentioned raw materials. In this embodiment, x=0.15, that is, by molar ratio n(Li 2 CO 3 ):n(Al 2 (SO 4 ) 3 ):n(Co 3 o 4 )=1:0.15:0.57 Take the corresponding above-mentioned raw materials. Mix the above raw materials, add absolute ethanol to disperse, wet grind for 4 hours, evaporate to remove absolute ethanol, dry, grind, increase the temperature in the air at a rate of 60°C / hour, and roast at a constant temperature of 850°C for 14 hours. Then drop to room temperature at a rate of 40°C / hour to obtain LiAl 0.15 co 0.85 o 2 product.

[0020] The above materials were applied to 18650-2.2Ah cylindrical batteries, and their mass specific capacity and cycle capacity retention were tested, and compared with undoped LiCoO 2 For comparison, the results ar...

Embodiment 2

[0024] On the basis of Example 1, under the condition that other conditions remain unchanged, the wet milling time is changed to 3h, 4h and 5h, and the performance of the product is as follows:

[0025] performance / milling time

Embodiment 3

[0027] On the basis of Example 1, under the condition that other conditions remain unchanged, the calcination temperature is changed to 800°C, 850°C and 900°C, and the properties of the product are as follows:

[0028] Properties / Firing temperature

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Abstract

The invention discloses a preparation method of lithium ion battery anode material. The method comprises the following steps: A. mixing Li2CO3, Al2(SO4)3 and Co3O4 in certain mol ratio; B. adding solvent in the obtained mixture for wet-grinding; C. removing solvent and drying; D. porphyrizing; E. roasting at high temperature; and F. cooling to obtain lithium, aluminum and cobalt oxide anode material. In the invention, metallic aluminum ions are doped in the preparation process of lithium ion battery anode material to exert synergistic effect, so as to prepare excellent performance lithium cobaltate doped with aluminum ions. The anode using the material can maintain stable structure after circulating for a long time, thus enhancing capacity retention rate.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, in particular to a preparation method of a layered lithium aluminum cobalt oxide cathode material for a lithium ion battery. Background technique [0002] At present, the positive electrode active materials of lithium-ion batteries mainly include lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide and vanadium oxide. LiNiO 2 It is easy to form non-stoichiometric compounds during the preparation process, resulting in unstable electrochemical performance and intolerance to overcharging. LiMn 2 o 4 Overcharge resistance, good safety performance, but poor cycle performance, fast capacity decay at high temperature. V 2 o 5 Lithium and its derivatives can dissolve to a certain extent in organic solvents and have strong oxidizing properties. During the process of lithium deintercalation, it can lead to the decomposition of organic solvents. LiCoO 2 Due to its easy prepara...

Claims

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Application Information

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IPC IPC(8): C01G51/04H01M4/52
CPCY02E60/12Y02E60/10
Inventor 宋华杰
Owner SHENZHEN BAK BATTERY CO LTD
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