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Silicon-based material and battery containing same

A technology of silicon-based materials and nuclear materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low initial charge and discharge efficiency of lithium-ion batteries, unfavorable rapid charge and discharge of batteries, and poor cycle performance, so as to improve the cycle performance. performance, reduction in volume expansion rate, and effect of high thermal conductivity

Pending Publication Date: 2022-04-12
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, silicon is a semiconductor material with low conductivity, which is very unfavorable for rapid charging and discharging of batteries
In addition, the silicon material will undergo a huge volume change during the process of lithium intercalation and deintercalation, which will cause the SEI film on the surface of the negative electrode material to continuously rupture-re-grow-crack-re-grow, which will lead to lithium-ion batteries using silicon as the negative electrode material. The initial charge and discharge efficiency is low and the cycle performance is poor

Method used

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  • Silicon-based material and battery containing same
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  • Silicon-based material and battery containing same

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preparation example Construction

[0047]The present invention also provides a method for preparing the above-mentioned silicon-based material. The method includes the following steps: reacting the silicon-based material and lithium salt-modified graphene oxide as raw materials to prepare a lithium-salt-modified graphene oxide-coated silicon-based material. material, and then prepare the silicon-based material through hydrothermal reduction reaction.

[0048] According to the invention, said silicon-based material has the options indicated above.

[0049] According to the present invention, the lithium salt-modified graphene oxide raw material is obtained by modifying graphene oxide with lithium salt.

[0050] According to the invention, the lithium salt has the options indicated above.

[0051] According to the present invention, the number of layers of the graphene oxide is 30wt%. A large number of experiments have unexpectedly found that: according to the particle size and coating thickness of the silicon-b...

Embodiment 1

[0076] Preparation of organolithium salt-modified graphene-coated silicon-based materials:

[0077] (1) Disperse 3 g of graphene oxide in 1 L of water and ultrasonically disperse to prepare a graphene oxide / water dispersion with a concentration of 3 mg / mL. Add 6g lithium 3-aminopropanesulfonylimide (for the preparation method, see "Synthesis, Characterization and Application of New Lithium Sulfonylimide Salt and Research on Its Application to Metal Lithium Secondary Batteries_Ma Qiang") to graphene oxide / water Dispersion, and stirred at reflux at 95 ° C for 12h. Suction filtration, then disperse in water again, obtain concentration and be 1.5mg / mL 3-aminopropanesulfonylimide lithium modified graphene oxide / water dispersion (recorded as LiGO / water dispersion, wherein: 3-amino in LiGO The content of propanesulfonylimide lithium is 28.2wt% (obtained by TGA and gas chromatography joint test));

[0078] (2) Add 0.9985kg of silicon oxide (D 50 8 μm, the shape is irregular particl...

Embodiment 2

[0087] The preparation process is the same as in Example 1, except that LiGO passes through graphene oxide and taurimide lithium (for the preparation method, refer to "synthesis, characterization and application of novel sulfonimide lithium salt and its application to metal lithium secondary batteries." The research_Ma Qiang ") prepared after the reaction (the content of lithium taurimide in LiGO is 32.1wt% (obtained by TGA and gas chromatography).

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Abstract

The invention discloses a silicon-based material and a battery containing the material, the silicon-based material has a core-shell structure, the core-shell structure comprises a core material and a shell material, the core material comprises the silicon-based material, and the shell material comprises lithium salt modified graphene. According to the invention, the surface of the silicon-based material is coated with the lithium salt modified graphene to form the core-shell structure, and the surface of the silicon material is coated with the lithium salt modified graphene, so that the volume stress generated by the silicon material in the lithium ion intercalation / deintercalation process can be effectively relieved. Meanwhile, the graphene can also synergistically improve the conductivity of the electrode, so that the cycle performance, the specific capacity, the charge-discharge efficiency and other electrochemical performance of the battery are improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a silicon-based material and a battery containing the material, in particular to a modified graphene-coated silicon-based material, a preparation method thereof, a negative electrode sheet and a battery containing the material. Background technique [0002] Lithium-ion batteries have been widely used due to their high energy density, long cycle life, and environmental friendliness. At present, graphite is the most commonly used negative electrode material in lithium-ion batteries, and its theoretical specific capacity is only 372mAh / g, which limits the development of lithium-ion batteries to higher energy density, while the theoretical specific capacity of silicon materials can reach 4200mAh / g , and its actual specific capacity is greater than 3000mAh / g, when it replaces graphite as the negative electrode material of lithium-ion batteries, it can significantly increase the energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M10/0525
CPCY02E60/10
Inventor 莫肇华赵伟唐伟超张赵帅李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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