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Silicon anode material with spherical thorn-like structure and preparation method thereof

A silicon negative electrode, thorn-like technology, applied in the field of silicon negative electrode material and its preparation, can solve the problems of deterioration of electrical properties of silicon negative electrode material, consumption of limited lithium source, and no feasibility of industrialized production, etc., to improve processing performance and electrochemical performance. performance, the effect of slowing down pulverization and membrane detachment, improving conductivity and surface stability

Active Publication Date: 2022-08-09
CAMEL GRP WUHAN OPTICS VALLEY R&D CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The continuous expansion and contraction of silicon negative electrode materials will bring a series of problems: 1. The cracking of silicon particles will cause the material to pulverize and the pole piece will fall off; 2. The surface of the cracked silicon particles will form a new SEI film with the electrolyte, which will consume limited lithium. 3. The continuously generated SEI film will increase the internal resistance of the battery
Although the invention prepares a hollow carbon-coated silicon negative electrode material by copper oxide template method and organic carbon source pyrolysis method, which can improve the cycle performance of silicon materials to a certain extent, but the method of the invention is complex and does not have industrial production feasibility
Moreover, in the cold pressing process of the battery manufacturing process, the silicon negative electrode material of the invention will have a hollow structure crushed and crushed, and lose the buffer space that can accommodate the volume expansion of silicon, resulting in a sharp deterioration in the electrical properties of the silicon negative electrode material.

Method used

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  • Silicon anode material with spherical thorn-like structure and preparation method thereof
  • Silicon anode material with spherical thorn-like structure and preparation method thereof
  • Silicon anode material with spherical thorn-like structure and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: a kind of silicon negative electrode material with spherical thorn-like structure, the preparation method is as follows, first weigh 100g of tetraethyl orthosilicate, 5g of urea, 20g of ascorbic acid and 10g of Triton, the above-mentioned raw materials are added to In 540g of glycerol solution, a suspension with a solid content of 20% was prepared; then the above-mentioned suspension was transferred to a closed reaction kettle for hydrothermal reaction, the reaction temperature was 240°C, and the reaction time was 24h; the hydrothermal reaction ended The silicon-oxygen compound precursor is then obtained, and then the silicon-oxygen compound precursor obtained by the hydrothermal reaction is washed and dried; then, under the protection of nitrogen, the silicon-oxygen compound precursor is coated with conductive carbon by a vapor deposition method, and the gas carbon source is Acetylene, the carbon coating temperature is 600 °C, the carbon coating time is 2 ...

Embodiment 2

[0026] Example 2: A silicon negative electrode material with spherical thorn-like structure. The preparation method is as follows. First, 100 g of silicone, 15 g of ammonia water, 10 g of reduced hydrazine and 20 g of oleic acid were weighed, and the above-mentioned raw materials were added to 217.5 g of dihydrate. In the methylformamide solution, a suspension with a solid content of 40% was prepared; then the above suspension was transferred to a closed reaction kettle for hydrothermal reaction, the reaction temperature was 180°C, and the reaction time was 18h; then the hydrothermal reaction was carried out. The obtained silicon-oxygen compound precursor was washed and dried; then, under the protection of nitrogen, the silicon-oxygen compound was covered with conductive carbon by vapor deposition method, the gas carbon source was methane, the carbon-coating temperature was 500°C, and the carbon-coating time was 6h. The coating carbon content is 4%; finally, the silicon anode m...

Embodiment 3

[0027] Embodiment 3: a kind of spherical thorn-shaped silicon negative electrode material, the preparation method is as follows, first weigh 100g of silicic acid, 10g of hydrochloric acid, 15g of sodium borohydride and 5g of stearic acid, add the above-mentioned raw materials to 303g of stearic acid. A suspension with a solid content of 30% is prepared in the ethylene glycol solution; then the above suspension is transferred to a closed reaction kettle for hydrothermal reaction, the reaction temperature is 360 ° C, and the reaction time is 10h; then the hydrothermal reaction is obtained. The silicon-oxygen compound precursor was washed and dried; then under the protection of nitrogen, the silicon-oxygen compound was coated with conductive carbon by vapor deposition method, the gas carbon source was ethylene, the carbon coating temperature was 400 °C, the carbon coating time was 4h, The carbon content is 6%; the silicon anode material with spherical thorn-like structure is final...

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Abstract

The invention belongs to the technical field of lithium ion battery electrode materials and its preparation, and discloses a silicon negative electrode material with a spherical thorn-like structure and a preparation method thereof, belonging to the technical field of lithium ion battery electrode materials and its preparation. The silicon source compound, the hydrolyzing agent, the reducing agent and the surfactant are added to the inert solvent, the above-mentioned suspension is transferred to the closed reaction kettle, and the silicon-oxygen material precursor is prepared by the hydrothermal method; The silicon oxide compound is coated with conductive carbon by the deposition method, and finally cooled to obtain a silicon anode material with a spherical thorn-like structure, the chemical formula of which is SiO x / C, where 0

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery electrode materials and preparation thereof, and particularly provides a silicon anode material and a preparation method thereof. Background technique [0002] With the continuous improvement of the battery life requirements of new energy vehicles, the energy density requirements of lithium-ion batteries as power sources are also rising. At present, improving the energy density of lithium-ion batteries in the industry mainly focuses on the development of high-nickel ternary cathode materials and high-capacity silicon anode materials. The theoretical gram capacity of silicon material can reach 4200mAh / g. Compared with the traditional graphite negative electrode material (372mAh / g), it has obvious gram capacity advantage, and the earth reserves of silicon element are high, and it has become a hot spot in the development of negative electrode materials in the industry. [0003] However, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/113C01B32/15H01M4/134H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 陈立鹏陈念邓茁
Owner CAMEL GRP WUHAN OPTICS VALLEY R&D CENT CO LTD
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