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Preparation method of high-density high-safety long-life lithium cobaltate

A long-life, high-density technology, applied in chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., can solve the problems of small particle diameter, long process time, and high energy of lithium cobaltate products, and achieve shortened crystal growth time, Effect of large particle diameter, improvement of safety performance and cycle life

Active Publication Date: 2012-01-25
北京盟固利新材料科技有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the synthesis of high-density lithium cobalt oxide materials in China mainly involves repeated calcination and crushing, which consumes a lot of energy, and the process takes a long time and the cost is relatively high. The particle diameter of the synthesized lithium cobalt oxide products is small, and there are potential safety hazards

Method used

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  • Preparation method of high-density high-safety long-life lithium cobaltate

Examples

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Effect test

Embodiment 1

[0019] Will Li 2 CO 3 and Co 3 o 4 Mix evenly with MgO according to the ratio of Li / Co=1.03, and the ratio of MgO to the whole material is 0.3%. The mixed material is sintered at 1000°C for 8 hours, and after cooling, it is crushed by high-speed swirl crushing. The crushed material is mixed with 1% nano-zinc oxide and sintered at 900°C for 5 hours. After cooling down, the material is crushed and classified. get the product. The medium particle size of its products is 12.3μm, the 1C discharge specific capacity is 155.7mAh / g, and the compacted density is 4.3g / cm 3 , 100 cycle capacity retention rate of 95.3%.

Embodiment 2

[0021] Will Li 2 CO 3 and Co 3 o 4 It is evenly mixed with sodium borate and lithium tetraborate according to the ratio of Li / Co=1.04, and the ratio of sodium borate and lithium tetraborate to the whole material is 1.0%. The mixed material is sintered at 950°C for 8 hours, and after cooling, it is crushed by high-speed swirl crushing. The crushed material is mixed with 0.5% nano-tin dioxide and sintered at 900°C for 8 hours. After cooling down, the material is crushed and classified , get the product. The particle size of the product is 13.7μm, the 1C discharge specific capacity is 157.2mAh / g, and the compacted density is 4.25g / cm 3 , 100 cycle capacity retention rate of 96.3%.

Embodiment 3

[0023] Will Li 2 CO 3 and Co 3 o 4 Mix evenly with calcium fluoride according to the ratio of Li / Co=1.05, and the proportion of calcium fluoride in the whole material is 0.2%. The mixed material is sintered at 1030°C for 10 hours, and after cooling, it is crushed by high-speed swirl crushing method. The crushed material is mixed with 0.3% nano-indium tin oxide and sintered at 980°C for 8 hours. After cooling down, the material is crushed and classified , get the product. The particle size of its products is 14.6μm, the 1C discharge specific capacity is 155.6mAh / g, and the compacted density is 4.25g / cm 3 , The 100-cycle capacity retention rate was 96.0%.

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Abstract

The invention relates to a preparation method of high-density high-safety long-life lithium cobaltate, which comprises the following steps of: adding a fluxing agent in the first high-temperature reaction process of the two-stage preparation method of lithium cobaltate so that the interfacial tension between two raw materials is reduced to achieve better fusion, produce crystal nucleus more easily, shorten crystal growth time, further shorten high-temperature reaction time and increase density; and coating one nanometer semiconductor material layer by adopting a dry method in the second high-temperature process so as to increase the electrochemical properties, the safety and the cycle life of lithium cobaltate. The prepared lithium cobaltate product has large granules, high compacted density, excellent electrochemical properties, convenient reaction process operations, low energy consumption and low cost.

Description

technical field [0001] The invention relates to lithium ion batteries, in particular to a method for preparing lithium cobalt oxide with high density, high safety and long life. Background technique [0002] Lithium-ion secondary batteries have the advantages of high working voltage, high energy density, low self-discharge rate, and good electrochemical cycle performance. They are not only widely used in mobile phones, notebook computers, and portable appliances, but also in electric vehicles, weapons, etc. Equipment, aerospace and other fields have shown good application prospects. Since the commercialization of lithium-ion secondary batteries, lithium cobalt oxide has been used as the cathode material. Although the price of lithium cobaltate is high due to the lack of cobalt resources, and the battery with lithium cobaltate as the positive electrode has potential safety hazards in use, but lithium cobaltate is still being used due to its high volumetric energy density, st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/00
Inventor 江卫军张春玲安平张溪朱晓沛孙春胜
Owner 北京盟固利新材料科技有限公司
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