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Glassy composite anode material and preparation method thereof

A negative electrode material and glass state technology, which is applied in the field of glassy composite negative electrode materials and its preparation, can solve the problems of poor cycle performance and achieve the effects of low cost, simple and easy preparation method, and high first-time efficiency

Inactive Publication Date: 2013-10-02
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 solve the problem of poor cycle performance due to the serious volume effect of silicon negative electrode materials when inserting and removing lithium, and propose a glassy composite negative electrode material and its preparation method by using volume compensation, which can maintain the high silicon density. While maintaining specific capacity characteristics, the volume change of the overall electrode is controlled at a reasonable level, increasing its cycle stability

Method used

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  • Glassy composite anode material and preparation method thereof
  • Glassy composite anode material and preparation method thereof
  • Glassy composite anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Add 4.8g of SiO, 1.2g of metallic lithium (Si / Li molar ratio of 5:8) and a certain amount of ball milling media into the ball milling tank, high-energy ball milling for 10 hours (under an inert protective atmosphere), and then 7.5wt.% (0.45g) H 3 BO 3 , 7.5wt.% (0.45g) P 2 O 5 And 5wt.% (0.3g) graphite powder are added into the ball mill tank, ball milling is continued for 5 hours, and then the obtained powder is vacuum dried at 100°C for 24 hours to obtain a silicon-based glassy composite material. The electrode preparation method, battery assembly, and test conditions are the same as those in Comparative Example 1. The measurement results are shown in Table 1. From the data in Table 1, it can be seen that compared to pure SiO and Si electrodes, the cycle performance of composite electrodes has been greatly improved.

Embodiment 2

[0047] 4.6g SiO and 1.4g metallic lithium (Si / Li molar ratio is 1:2) and H in the same ratio as in Example 1. 3 BO 3 , P 2 O 5 , Graphite powder according to the method of Example 1 to obtain a silicon-based glassy composite material. The electrode preparation method, battery assembly, and test conditions are the same as those in Comparative Example 1. The test results are shown in Table 1.

Embodiment 3

[0049] 4.6g SiO and 1.4g metal lithium (Si / Li molar ratio is 1:2) and 2.5wt.%B 2 O 3 (0.15g), 2.5wt.%(0.15g)P 2 O 5 , 5wt.% (0.3g) graphite powder according to the method of Example 1 to obtain a silicon-based glassy composite material. The electrode preparation method, battery assembly, and test conditions are the same as those in Comparative Example 1. The test results are shown in Table 1.

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Abstract

The invention relates to a glassy composite anode material and a preparation method thereof, which belong to the field of eletrochemical power sources. In the invention, a simple substance with the lithium intercalation capacity or an oxide and a suitable reducing agent are adopted to carry out mechanochemical in-situ reduction, and then a glassy oxide and other electric conduction components areadded to be used as dispersing matrixes for further ball milling to prepare the composite material. Aiming at the problem that serious volume effect leads to poor cycle performance in the lithium intercalation and deintercalation process of a silicon anode material, the invention enables the volume change of the overall electrode to be controlled at a reasonable level while keeping the high-specific capacity characteristic so as to improve the cycle stability of the anode material. The first efficiency of the electrode of the composite material is more than 80 percent, and the reversible capacity is larger than 500mAh / g; the composite material has good electrochemical cycle stability.

Description

Technical field [0001] The invention relates to a type of glassy composite negative electrode material and a preparation method thereof, and belongs to the field of chemical power sources. Background technique [0002] Since Sony commercialized lithium-ion batteries in the 1990s, due to their high open circuit voltage, high energy density, long cycle life, no pollution, no memory effect and many other advantages, they have been used in various portable mobile tools and digital products. , Artificial satellites and aerospace have been widely used in many fields; at the same time, it has also set off an upsurge in lithium-ion battery research worldwide. The improvement of lithium-ion battery performance mainly depends on the improvement of the energy density and cycle life of the electrode material. At present, commercial lithium-ion batteries widely use graphite and modified graphite as anode materials, which have made their specific capacity very close to the theoretical value (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/42H01M4/48H01M4/50H01M4/58H01M4/04
CPCY02E60/12Y02E60/10
Inventor 温兆银王秀艳刘宇徐小刚吴相伟张敬超韩金铎黄乐之
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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