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

A silicon negative electrode and thorn-shaped technology, which is applied in the field of silicon negative electrode materials and its preparation, can solve the problems of silicon negative electrode materials such as deterioration of electrical properties, consumption of limited lithium sources, and increase of internal resistance of batteries, so as to improve processing performance and electrochemical performance, Improve electrical conductivity and surface stability, slow down the effect of crushing and pulverization and membrane detachment

Active Publication Date: 2019-06-28
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-shaped structure and preparation method thereof
  • Silicon anode material with spherical thorn-shaped structure and preparation method thereof
  • Silicon anode material with spherical thorn-shaped structure and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] Embodiment 1: a kind of silicon negative electrode material of spherical thorn-like structure, preparation method is as follows, first weighs the tetraethyl orthosilicate of 100g, the urea of ​​5g, the ascorbic acid of 20g and the triton of 10g, above-mentioned raw material is joined in In 540g of glycerol solution, make a suspension with a solid content of 20%; then transfer the above suspension to a closed reactor for hydrothermal reaction, the reaction temperature is 240°C, and the reaction time is 24h; the hydrothermal reaction ends Finally, the silicon oxide compound precursor is obtained, and then the silicon oxide compound precursor obtained by the hydrothermal reaction is washed and dried; then under the protection of nitrogen, the silicon oxide compound precursor is coated with conductive carbon by vapor deposition method, and the gas carbon source is Acetylene, the carbon coating temperature is 600°C, the carbon coating time is 2 hours, and the coating carbon c...

Embodiment 2

[0026] Embodiment 2: a silicon negative electrode material with a spherical thorn-like structure, the preparation method is as follows, first weigh 100g of silicone, 15g of ammonia, 10g of reduced hydrazine and 20g of oleic acid, and add the above-mentioned raw materials to 217.5g of di In the methyl formamide solution, a suspension with a solid content of 40% was prepared; then the above suspension was transferred to a closed reactor for hydrothermal reaction, the reaction temperature was 180°C, and the reaction time was 18h; then the hydrothermal reaction The obtained silicon oxide compound precursor was washed and dried; then, under the protection of nitrogen, the silicon oxide compound was coated with conductive carbon by vapor phase deposition method, the gas carbon source was methane, the carbon coating temperature was 500°C, and the carbon coating time was 6h. The amount of coated carbon is 4%; finally cooled to obtain a silicon negative electrode material with a spheric...

Embodiment 3

[0027] Embodiment 3: a silicon negative electrode material with a spherical thorn-like structure, 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, and add the above-mentioned raw materials to 303g of A suspension with a solid content of 30% was prepared in an ethylene glycol solution; then the above suspension was transferred to a closed reactor for hydrothermal reaction, the reaction temperature was 360 ° C, and the reaction time was 10 h; then the hydrothermal reaction was obtained The silicon oxide compound precursor was washed and dried; then under the protection of nitrogen, the silicon oxide compound was coated with conductive carbon by vapor phase deposition. The carbon content is 6%; the silicon negative electrode material with a spherical thorn-like structure is finally cooled, which is a spherical thorn-shaped particle formed by the agglomeration of silicon-oxygen nanoro...

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Abstract

The invention belongs to the technical field of lithium ion battery electrode materials and preparation thereof and discloses a silicon anode material with a spherical thorn-shaped structure and a preparation method thereof, and belongs to the technical field of lithium ion battery electrode materials and preparation thereof. A silicon source compound, a hydrolyzing agent, a reducing agent and a surfactant are added into an inert solvent, the suspension liquid is transferred to a closed reaction kettle, and a silicon-oxygen material precursor is prepared through a hydrothermal method; then conductive carbon coating is conducted on a silicon oxide compound by adopting a vapor deposition method under the protection of nitrogen, and finally cooling is executed to obtain the silicon anode material with the spherical thorn-shaped structure, wherein the chemical formula of the siliconanode material is SiOx / C, and x is greater than 0 but is smaller than 1. The gram capacity of the first reversible discharge of the silicon anode material prepared by the preparation method is 2101 mAh / g and the first efficiency is 86% under the current of 0.1C, the capacity retention rate is 100% after 100charge-discharge cycles under the current of 0.5C, and the silicon anode material has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery electrode materials and preparation thereof, and in particular provides a silicon negative electrode material and a preparation method thereof. Background technique [0002] With the continuous improvement of the endurance requirements of new energy vehicles, the energy density requirements of lithium-ion batteries as a power source are also rising. At present, increasing 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 anode material (372mAh / g), it has obvious advantages in gram capacity, and the earth reserves of silicon element are high. It has become a hot spot in the development of anode materials in the industry. [0003] However, during the ch...

Claims

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Application Information

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Patent Type & Authority Applications(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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