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Silicon negative electrode material coated with sulfur-based solid electrolyte and preparation method thereof

A technology of solid electrolyte and silicon negative electrode, which is applied in the direction of electrolyte, battery electrode, circuit, etc., can solve the problems of low cycle performance and rate performance of silicon negative electrode, poor electronic conductivity of alumina, and complicated drying and spraying equipment, etc., to achieve improvement Effects of battery cycle performance and coulombic efficiency, reduction of battery internal resistance, improvement of cycle performance and coulombic efficiency

Active Publication Date: 2019-11-26
深圳索理德新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned technology has the following disadvantages: First, the drying and spraying equipment is complicated and the energy consumption is high, which will greatly increase the cost of materials
The materials prepared by this technology have the following disadvantages: alumina has poor electronic conductivity and ionic conductivity, resulting in relatively low cycle performance and rate performance of the coated silicon anode
At present, there are no relevant reports in the market or patents about sulfur-based solid electrolyte coated silicon as the negative electrode of lithium-ion batteries.

Method used

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  • Silicon negative electrode material coated with sulfur-based solid electrolyte and preparation method thereof
  • Silicon negative electrode material coated with sulfur-based solid electrolyte and preparation method thereof
  • Silicon negative electrode material coated with sulfur-based solid electrolyte and preparation method thereof

Examples

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Effect test

Embodiment 1

[0042] Grind lithium sulfide and phosphorus pentasulfide in a mortar at a ratio of 10:1 (molar ratio), add silicon and ground sulfide to tetrahydrofuran at a ratio of 10:1 (mass ratio), stir magnetically at room temperature for 8 hours, and use suction filtration to Methods The organic solvent was removed, and the silicon / sulfur-based solid electrolyte composite negative electrode material was obtained by heat treatment at 50°C for 24 hours.

Embodiment 2

[0044]Grind lithium sulfide and phosphorus pentasulfide in a mortar at a ratio of 1:1 (molar ratio), add silicon and ground sulfide to acetonitrile at a ratio of 1:1 (mass ratio), stir magnetically at room temperature for 24 hours, and use rotary evaporation Methods The organic solvent was removed and heat treated at 150°C for 12 hours to obtain a silicon / sulfur-based solid electrolyte composite anode material.

Embodiment 3

[0046] Mill lithium sulfide, phosphorus pentasulfide, and germanium sulfide in a ball mill for 12 hours at a ratio of 5:2:1 (molar ratio), and add silicon and mixed sulfide to dimethyl ether at a ratio of 1:2 (mass ratio), at 50°C Under magnetic stirring for 24 hours, the organic solvent was removed by suction filtration, and heat treated at 900° C. for 8 hours to obtain a silicon / sulfur-based solid electrolyte composite negative electrode material.

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Abstract

The invention discloses a silicon / sulfur-based solid electrolyte composite negative electrode material with high cycle property and a preparation method thereof. The silicon / sulfur-based solid electrolyte composite negative electrode material is prepared by in-situ synthesis one-step method of a solution. The method is simple and convenient to operate, the mechanical property and the electrochemical performance stability of silicon are improved by coating of a sulfur-based solid electrolyte, and the composite negative electrode has favorable electrochemical cycle property. The composite material has the following advantages that the volume expansion of a silicon negative electrode during the charge-discharge process can be effectively reduced by the sulfur-based solid electrode, meanwhile, the sulfur-based solid electrolyte has relatively high ion conductivity compared with a primary solid electrolyte membrane, the diffusion of Li ions can be effectively improved, the internal resistance of a battery is effectively reduced, and the rate performance of the battery is improved.

Description

technical field [0001] The invention relates to the field of preparation of lithium-ion battery sulfur-based solid-state electrolyte-coated silicon negative electrode materials, in particular to the preparation of a composite electrode material with good performance in the charging and discharging process. Background technique [0002] In order to meet the needs of grid energy storage, electric vehicles and consumer electronics products for energy storage devices, electrode materials with long cycle life, high energy density and power density are currently research hotspots. Due to its abundant natural reserves, low discharge platform and large specific capacity (4200mAh / g), silicon is considered to be the most potential anode material for lithium batteries in the future. However, there are certain problems in the application of the silicon negative electrode, for example, the volume expands by more than 300% during the charging and discharging process, resulting in continuo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525H01M10/0562
CPCH01M4/366H01M4/386H01M4/624H01M4/628H01M10/0525H01M10/0562H01M2300/002Y02E60/10
Inventor 慈立杰徐小燕
Owner 深圳索理德新材料科技有限公司