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Preparation method of carbon coated silicon-tin composite negative electrode plate

A technology of carbon coating and negative electrode sheet, which is applied in the field of electrochemical power supply to achieve the effect of stable volume, long service life and good conductivity

Inactive Publication Date: 2018-03-02
WANXIANG 123 CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the lack of electrical conductivity of silicon-tin composite materials and the problem that the formation of silicon-tin and lithium metal alloys will cause volume expansion and affect the service life, the invention provides a method for preparing carbon-coated silicon-tin composite negative electrodes It can improve the lack of electrical conductivity of silicon-tin composite materials and alleviate the volume expansion caused by alloy formation, improve the cycle stability of the negative electrode of lithium power batteries, and achieve high weight energy density and high volume energy density at the same time

Method used

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  • Preparation method of carbon coated silicon-tin composite negative electrode plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 5g of silicon powder, 70g of tin powder and 7.5g of artificial graphite powder A are subjected to mechanical high-energy ball milling in a helium atmosphere to obtain tin-silicon composite powder with a particle size of D 501.0 microns. The prepared silicon-tin composite powder and 7.74 g of artificial graphite powder B with a particle size of 10 microns were mixed in a mixer to obtain a silicon-tin composite matrix. Utilize the chemical vapor deposition method to cover the carbon layer on the surface of the silicon-tin composite substrate to obtain a carbon-coated tin-silicon composite material. The quality of the coated carbon powder is 3.76g. The chemical vapor deposition operation steps are as follows: a) silicon-tin composite Spread the substrate on the copper sheet, put the copper sheet into the quartz tube; b) place the quartz tube in the heating zone of the tube furnace; For 30 minutes, the air in the quartz tube is exhausted and the argon gas is continued to f...

Embodiment 2

[0031] 5g of silicon powder, 30g of tin powder and 3.5g of artificial graphite powder A are subjected to mechanical high-energy ball milling in a helium atmosphere to obtain tin-silicon composite powder with a particle size of D 50 1.0 microns. The prepared silicon-tin composite powder and 51.74 g of artificial graphite powder B with a particle size of 10 microns were mixed in a mixer to obtain a silicon-tin composite matrix. A carbon-coated tin-silicon composite material was obtained by covering the surface of the silicon-tin composite substrate with a carbon layer by chemical vapor deposition. The mass of the coated carbon powder was 3.76 g. The chemical vapor deposition operation steps were shown in Embodiment 1. Add 3g Ketjen Black and 3g polyvinylidene fluoride to the prepared carbon-coated tin-silicon composite material and mix them in a mixer to obtain a carbon-coated tin-silicon composite slurry. Single-sided coating on foil with a coating density of 2mg / cm 2 , and a...

Embodiment 3

[0034] 5g of silicon powder, 10g of tin powder and 1.5g of artificial graphite powder A are subjected to mechanical high-energy ball milling in a helium atmosphere to obtain tin-silicon composite powder with a particle size of D 50 1.0 microns. The prepared silicon-tin composite powder and 73.74 g of artificial graphite powder B with a particle size of 10 microns were mixed in a mixer to obtain a silicon-tin composite matrix. A carbon-coated tin-silicon composite material was obtained by covering the surface of the silicon-tin composite substrate with a carbon layer by chemical vapor deposition. The mass of the coated carbon powder was 3.76 g. The chemical vapor deposition operation steps were shown in Embodiment 1. Add 3g Ketjen Black and 3g polyvinylidene fluoride to the prepared carbon-coated tin-silicon composite material and mix them in a mixer to obtain a carbon-coated tin-silicon composite slurry. Single-sided coating on foil with a coating density of 2mg / cm 2 , and a...

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Abstract

The invention discloses a preparation method of a carbon coated silicon-tin composite negative electrode plate. The preparation method includes the following steps: (1) carrying out mechanical high-energy ball milling of a silicon powder, a tin powder and an artificial graphite powder A to prepare a silicon-tin composite powder; (2) mixing the silicon-tin composite powder with an artificial graphite powder B, to prepare a silicon-tin composite powder matrix; (3) carrying out carbon coating on the silicon-tin composite powder matrix by a chemical vapor deposition method, to prepare a carbon coated silicon-tin composite material; (4) mixing the carbon coated silicon-tin composite material, a binder and a conductive agent, to prepare a carbon coated silicon-tin composite slurry; and (5) carrying out single-side coating of a copper foil with the carbon coated silicon-tin composite slurry, to prepare the carbon coated silicon-tin composite negative electrode plate. The carbon coated silicon-tin composite negative electrode plate has the characteristics of stable volume, high energy density, good electrical conductivity, stable circulation and long service life.

Description

technical field [0001] The invention belongs to the field of electrochemical power sources, in particular to a method for preparing a carbon-coated silicon-tin composite negative plate. Background technique [0002] Silicon is the anode material with the highest theoretical lithium storage capacity (Li 22 Si 5 , 4200mAh / g), its specific capacity is much higher than the current commercialized graphite anode material. The lithium intercalation potential of silicon is between 0-0.4V, and the voltage platform of silicon is very stable at the first discharge, which is due to the two-phase transition from crystalline silicon to amorphous silicon in the first discharge of silicon. In the subsequent cycles, the silicon has maintained an amorphous structure, so the voltage plateau is also different from the first time. [0003] The voltage platform of silicon is slightly higher than that of graphite, and it will not cause lithium deposition on the surface during charging and disch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395
CPCH01M4/1395Y02E60/10
Inventor 石先兴王慧敏严红
Owner WANXIANG 123 CO LTD
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