Composite cathode material for lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of low initial Coulombic efficiency, irreversible reactions, etc., achieve good electrochemical cycle stability, improve long-term cycle stability, and operate convenient effect

Active Publication Date: 2010-07-28
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a composite negative electrode material for a lithium-ion battery and a preparation method for the problems of the irreversible reaction of the first lithium intercalation in the oxide negative electrode material and the low initial Coulombic efficiency.

Method used

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  • Composite cathode material for lithium ion battery and preparation method thereof
  • Composite cathode material for lithium ion battery and preparation method thereof
  • Composite cathode material for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 5.045g SiO, 0.953g metal lithium (the molar ratio of Si / Li is 5:6) and 5g undecane into the ball mill jar, high-energy ball mill for 10h (under an inert protective atmosphere), and then the obtained powder Dry in vacuum at 100°C for 24h to obtain Si / Li 2 O / Li 4SiO 4 (molar ratio 4:1:1) composite material. The electrode preparation method, battery assembly, and test conditions are the same as in Comparative Example 1. See Table 1 for test data.

Embodiment 2

[0040] With 4.916g SiO and 1.084g metallic lithium (the molar ratio of Si / Li is 5: 7) and 8g dodecane, obtain Si / / Li / Li according to the method for embodiment 1 2 O / Li 4 SiO 4 (molar ratio 4:1:1:1) composite material. See Table 1 for test data.

Embodiment 3

[0042] With 4.812g SiO and 1.213g metallic lithium (the molar ratio of Si / Li is 5: 8) and 10g dedecane, obtain Si / / Li / Li according to the method for embodiment 1 2 O / Li 4 SiO 4 (molar ratio 4:2:1:1) composite material. See Table 1 for test data.

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Abstract

The invention relates to composite cathode material for a lithium ion battery and a preparation method thereof, belonging to the chemical power source field. The invention aims to solve the problems that the first lithium ion insertion process of oxide cathode material performs an irreversible reaction, the first coulombic efficiency is low, etc. The preparation method comprises the following steps: using precursor MO, reducing agent metal lithium and a defined amount of organic solvent to perform wet mechanochemical in situ reduction and obtain power, heating the obtained power under vacuum atmosphere to remove organic solvent, and obtaining the composite material. The method of the invention has simple process, low cost and wide application range; and the first efficiency of the prepared composite cathode material is more than 80%, the maximum is more than 95%, and the composite cathode material also has good electrochemical cycle stability.

Description

technical field [0001] The invention relates to a composite negative electrode material for a lithium ion battery and a preparation method thereof, belonging to the field of chemical power sources. Background technique [0002] Lithium-ion batteries have been widely used in various portable mobile tools, digital products and many other fields because of their high open circuit voltage, high energy density, long cycle life, no pollution, no memory effect and many other advantages. At present, graphite and modified graphite are widely used as anode materials in commercial lithium-ion batteries, and their theoretical capacity is low, so there is little room for further research. The research and application of anode materials for high-capacity lithium-ion batteries has become the key to improving the performance of lithium-ion batteries. In recent years, research on electrochemically reversible intercalation / delithiation anode materials has been very active. Among them, silic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/48H01M4/58H01M4/04
CPCY02E60/12Y02E60/10
Inventor 温兆银王秀艳刘宇林久李宁黄颖宋树丰张群喜
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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