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Preparation of silicon composite material and negative plate containing silicon composite material

A silicon composite material, negative electrode sheet technology, applied in negative electrodes, nanotechnology for materials and surface science, battery electrodes, etc., can solve the problems of low initial efficiency and consumption of batteries, and achieve small volume expansion and cycle stability. Good, high gram capacity results

Active Publication Date: 2021-02-02
SHANGHAI RUIPU ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This by-product should consume a large amount of lithium, resulting in low first battery efficiency

Method used

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  • Preparation of silicon composite material and negative plate containing silicon composite material
  • Preparation of silicon composite material and negative plate containing silicon composite material
  • Preparation of silicon composite material and negative plate containing silicon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Preparation of nano-silicon / carbon nanotubes / silicon-oxygen complex:

[0057] Add 1g of nano silicon, 0.05g of carbon nanotubes, 1g of alkyleneiminoalkenyl dimethylsilane, and 0.1g of polyethylene glycol with a molecular weight of 900 to 100g of organic solvent N-methylpyrrolidone in sequence, and stir and mix evenly. Spray-dried to obtain a mixed powder, carbonized the mixed powder at a high temperature of 600° C. for 5 hours, and ball-milled to obtain a nano-silicon / carbon nanotube / silicon-oxygen composite.

[0058] (2) Lithium supplementation of silicon / carbon nanotube / silicon-oxygen complex:

[0059] Mix the activator (a mixture of 0.15M HCl, 0.05M HF and 0.05M sodium nitrate) and nano-silicon / carbon nanotubes / silicon-oxygen complex at room temperature for 10 hours, then dry at 90°C for 8 hours , heat-treated at 550°C for 6h, and finally cooled to room temperature under the protection of Ar gas. The obtained powder was cooled and lithium source (50wt.% lithium...

Embodiment 2

[0063] (1) Preparation of nano-silicon / carbon nanotubes / silicon-oxygen complex:

[0064] Add 1.5g of nano-silicon, 0.03g of carbon nanotubes, 1.5g of alkyleneiminoalkenyldimethylsilane, and 0.2g of polyethylene glycol with a molecular weight of 900 to 100g of organic solvent acetone in sequence, stir and mix evenly, and spray dry A mixed powder was obtained, which was carbonized at a high temperature of 500° C. for 6 hours, and ball milled to obtain a nano-silicon / carbon nanotube / silicon-oxygen composite.

[0065] (2) Lithium supplementation of silicon / carbon nanotube / silicon oxygen complex:

[0066] The activator (a mixture of 0.25M HCl, 0.02M HF and 0.02M sodium nitrate) was uniformly mixed with nano-silicon / carbon nanotubes / silicon-oxygen complex at room temperature for 8h, and then dried at 80°C for 10h , heat-treated at 500 °C for 7 h, and finally cooled to room temperature under the protection of Ar gas. Cool the obtained powder and lithium source (50wt.% lithium sulfa...

Embodiment 3

[0070] (1) Preparation of nano-silicon / carbon nanotubes / silicon-oxygen complex:

[0071] Add 2g of nano-silicon, 0.02g of carbon nanotubes, 1.8g of alkyleneiminoalkenyldimethylsilane, and 0.6g of polyethylene glycol with a molecular weight of 900 to 100g of carbon tetrachloride in sequence, stir and mix evenly, and spray dry A mixed powder was obtained, which was carbonized at a high temperature of 550° C. for 5.5 hours, and ball milled to obtain a nano-silicon / carbon nanotube / silicon-oxygen composite.

[0072] (2) Lithium supplementation of silicon / carbon nanotube / silicon oxygen complex:

[0073] Mix the activator (a mixture of 0.2M HCl, 0.03M HF and 0.03M sodium nitrate) and nano-silicon / carbon nanotubes / silicon-oxygen complex at room temperature for 9 hours, then dry at 85°C for 9 hours , heat-treated at 600 °C for 6 h, and finally cooled to room temperature under the protection of Ar gas. The obtained powder was cooled and lithium source (50wt.% lithium nitrate and 50wt....

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Abstract

The invention discloses preparation of a silicon composite material and a negative plate containing the silicon composite material, and relates to the field of silicon-based composite materials. The silicon-based composite material comprises silicon nanoparticles, carbon nanotubes, silicon oxide, lithium oxide and lithium silicate, wherein the carbon nanotubes and the silicon nanoparticles are dispersed and crosslinked to form a three-dimensional network structure; and the silicon oxide, the lithium oxide and the lithium silicate coat the three-dimensional network structure to form secondary particles. The silicon secondary particles and graphite are homogenized and coated according to a specific particle size ratio to prepare the silicon-containing negative plate with high capacity exertion, good conductivity, high coulombic efficiency, small volume expansion and high cycling stability.

Description

technical field [0001] The invention belongs to the technical field of silicon-based composite materials, and relates to the preparation of a silicon composite material and a negative electrode sheet containing it, in particular to a silicon / carbon nanotube / silicon oxide / lithium oxide / lithium silicate composite material and its containing Preparation of negative electrode sheet. Background technique [0002] With the continuous popularization of batteries for new energy vehicles and the continuous demand of consumers for cruising range, further improving the energy density of batteries has become the key. Silicon has the advantages of high gram capacity (>3000mAh / g), abundant resources, and low potential for lithium, making it a popular choice to replace graphite. However, severe volume expansion (about 300%) occurs after silicon intercalated lithium expands, resulting in poor cycle stability. Studies have shown that coating silicon nanoparticles with silicon oxide to f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/134H01M10/0525B82Y30/00
CPCH01M4/386H01M4/628H01M4/134H01M4/624H01M4/625H01M10/0525B82Y30/00H01M2004/027H01M2004/021Y02E60/10H01M4/587H01M4/0471H01M4/364H01M4/483H01M4/622H01M4/0404H01M4/661H01M4/133H01M4/1395H01M4/366H01M4/62H01M4/583H01M4/662
Inventor 孙语蔚王金钻侯敏曹辉
Owner SHANGHAI RUIPU ENERGY CO LTD
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