Silicon-tin-oxygen-carbon compound electrode material and preparation method and application thereof

A carbon composite material, carbon composite technology, applied in the direction of active material electrode, nanotechnology for materials and surface science, negative electrode, etc. Density and reversible capacity, good cycle stability, and excellent cycle rate performance

Pending Publication Date: 2022-05-06
无锡新锂耀辉能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cycle stability and conductivity of the silicon material constructed by the above method did not meet the theoretical expectations.

Method used

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  • Silicon-tin-oxygen-carbon compound electrode material and preparation method and application thereof
  • Silicon-tin-oxygen-carbon compound electrode material and preparation method and application thereof
  • Silicon-tin-oxygen-carbon compound electrode material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] 1. Preparation of silicon-tin-oxygen-carbon (Si-Sn-O-C) composite electrode material

[0036] (1) Weigh 2 g of solar cutting waste silicon, add it to 20 mL of acetone solution, ultrasonicate for 60 minutes, centrifuge at 10,000 rpm for 5 minutes, and then vacuum dry at 80°C for 10 hours. After drying, use a ball mill to refine its particles, put 0.5g of waste silicon into a 100 milliliter ball mill tank, the ball-to-material ratio is 40:1, and the rotating speed is 450 rpm, under high-purity (99.9999%) inert gas ( Argon) under the protection of ball milling for 10 hours.

[0037] (2) After ball milling, waste silicon and nano-tin dioxide are mixed in a mortar with a molar ratio of 2:1, and a total of 1 g of waste silicon and nano-tin dioxide mixture is weighed and poured into a crucible, and placed in a tubular calciner Carry out high-temperature heat treatment, raise the temperature to 700°C at a rate of 5°C / min, and keep it warm for 12 hours. During the heating proce...

Embodiment 2

[0060] 1. Preparation of silicon-tin-oxygen-carbon (Si-Sn-O-C) composite electrode material

[0061] (1) Weigh 2 g of solar cutting waste silicon, add it to 20 mL of acetone solution, ultrasonicate for 60 minutes, centrifuge at 10,000 rpm for 5 minutes, and then vacuum dry at 80°C for 10 hours. After drying, use a ball mill to refine its particles, put 0.5g of waste silicon into a 100 milliliter ball mill tank, the ball-to-material ratio is 40:1, and the rotating speed is 450 rpm, under high-purity (99.9999%) inert gas ( Argon) under the protection of ball milling for 10 hours.

[0062] (2) After ball milling, waste silicon and nano-tin dioxide are mixed in a mortar with a molar ratio of 2:1, and a total of 1 g of waste silicon and nano-tin dioxide mixture is weighed and poured into a crucible, and placed in a tubular calciner Carry out high-temperature heat treatment, raise the temperature to 700°C at a rate of 5°C / min, and keep it warm for 12 hours. During the heating proce...

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Abstract

The invention discloses a silicon-tin-oxygen-carbon composite electrode material and a preparation method and application thereof, the material comprises silicon particles, tin and tin oxide particles and an amorphous carbon layer, and the molar ratio of the silicon particles to the tin and tin oxide particles is (1-2): 1; wherein the tin particles are coated with the silicon particles, the tin oxide particles and the amorphous carbon layer. Compared with the prior art, the silicon-tin-oxygen-carbon composite electrode material has the following advantages: (1) the silicon-tin-oxygen-carbon composite electrode material overcomes the defect of volume expansion of a silicon electrode material, and ensures the high energy density and reversible capacity of the material; (2) the electrode material is good in cycling stability and excellent in cycling rate performance, and can be produced on a large scale; and (3) the silicon-based material provides a new direction for the treatment of the solar waste silicon plate, and the whole process is free of acid pickling and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and relates to a lithium ion battery negative electrode material and a preparation method thereof, in particular to a silicon-tin-oxygen-carbon composite electrode material and a preparation method and application thereof. Background technique [0002] At present, the commercial anode materials in lithium-ion batteries are mainly graphite carbon-based carbon materials, which are widely used because of their high conductivity and strong cycle stability. However, the maximum theoretical specific capacity of graphite carbon materials is only 372mAh / g, which gradually cannot meet the demand. Silicon is considered to be the most promising electrode material, with a theoretical capacity of up to 4200mAh / g (reversible reaction with Li to form various Si-Li alloys, and eventually Li 4.4 Si alloy), and silicon is abundant on the earth. In addition, the lithiation platform voltage of silicon ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/38H01M4/48H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/366H01M4/364H01M4/625H01M4/628H01M4/386H01M4/387H01M4/626H01M4/483H01M10/0525B82Y30/00B82Y40/00H01M2004/027H01M2004/021
Inventor 张耀吴子强张辉
Owner 无锡新锂耀辉能源科技有限公司
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