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Lithium-silicon alloy negative electrode preparation method and sulfide all-solid-state battery

An all-solid-state battery, lithium-silicon alloy technology, applied in battery electrodes, secondary batteries, electrode manufacturing, etc., can solve the problems of poor negative electrode conductivity and reduce battery capacity, to improve energy density, improve cycle life, inhibit formation and effect of growth

Pending Publication Date: 2022-07-12
SHANGHAI FIRM-LITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conductivity of lithium-silicon alloy has a significant impact on the performance of sulfide solid-state batteries, and the poor conductivity of the negative electrode will reduce the capacity of the battery

Method used

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  • Lithium-silicon alloy negative electrode preparation method and sulfide all-solid-state battery
  • Lithium-silicon alloy negative electrode preparation method and sulfide all-solid-state battery
  • Lithium-silicon alloy negative electrode preparation method and sulfide all-solid-state battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] In an argon-filled glove box, place about 0.3 g of lithium powder and 0.18 g of micron-sized silicon powder in an agate ball mill jar, add about 9.6 g of ball milling beads, add 3 mL of hexane as a lubricant, and use a tape to grind the ball. The jar was well sealed, and the glove box was removed for ball milling. The ball milling time was 100 min and the rotation speed was 500 rpm. Put the ball-milled Li-Si mixed powder in a glove box to volatilize the solvent for more than 12 hours, and finally obtain Li 4.4 Si alloy powder. Xiang Li 4.4 The Si alloy powder was added with 10% (mass ratio) polytetrafluoroethylene (PTFE) as a binder, and 5% (mass ratio) conductive carbon fiber (VCGF) was manually ground in a mortar for 10 min to mix it uniformly. Weigh 10 mg of the above powder and place it in a tableting die with a diameter of 10 mm, press it into a tablet on the surface of the Cu foil current collector, and obtain Li after demolding. 4.4 Si alloy negative pole piec...

Embodiment 2

[0055] In an argon-filled glove box, place about 0.263g of lithium powder and 0.28g of micron silicon powder in an agate ball mill jar, add about 27g of ball milling beads, add 5mL of hexane as a lubricant, and use a tape to seal the ball mill jar. Seal well, remove the glove box, and perform ball milling. The ball milling time is 100 min, and the rotation speed is 550 rpm. Put the ball-milled Li-Si mixed powder in a glove box to evaporate the solvent for 15 hours, and finally obtain Li 3.75 Si alloy powder. Xiang Li 3.75 The Si alloy powder was added with 12% (mass ratio) hydroxypropyl methylcellulose (HPMC) as a binder, and 8% (mass ratio) conductive carbon black (HGCB) was manually ground in a mortar for 10 min to make it Mix well and get. Weigh 10 mg of the above powder and place it in a tableting die with a diameter of 10 mm, press it into a tablet on the surface of the Cu foil current collector, and obtain Li after demolding. 3.75 Si alloy negative pole piece, the pr...

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Abstract

The invention provides a preparation method of a lithium-silicon alloy negative electrode and a sulfide all-solid-state battery. The preparation method comprises the steps of preparation of lithium-silicon alloy powder, preparation of a lithium-silicon alloy pole piece and preparation of the sulfide all-solid-state battery. The lithium silicon alloy negative electrode and the sulfide solid electrolyte can easily generate a LixSiSy layer with high ionic conductivity and low impedance to serve as an SEI film, so that an interface between the solid electrolyte and the negative electrode is stabilized, growth and formation of lithium dendrites are inhibited, expansion and shrinkage of the negative electrode in the charging and discharging process are avoided, and the service life of the solid electrolyte is prolonged. Therefore, the capacity, the cycling stability and the charge-discharge efficiency of the sulfide solid-state battery are improved, and the method has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of new energy batteries, in particular to a method for preparing a lithium-silicon alloy negative electrode and a high-performance sulfide all-solid-state battery. Background technique [0002] Based on the current environmental and energy crisis, there is an urgent need to build a new energy system that is low-carbon, environmentally friendly, efficient and safe. The secondary battery technology represented by lithium-ion batteries has made great achievements in the fields of electric transportation, mobile communication and consumer electronics. However, the widely used lithium-ion batteries use organic electrolytes, which have major safety hazards, which restrict the further application of lithium-ion batteries in the field of electric transportation. Based on the huge potential of solid-state batteries in terms of energy density, power density and cycle life, all-solid-state lithium batteries use solid-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/134H01M4/04H01M10/0562
CPCH01M4/1395H01M10/0562H01M4/134H01M4/0433H01M2004/027Y02E60/10
Inventor 张希朱金辉陈振营
Owner SHANGHAI FIRM-LITHIUM NEW ENERGY TECH CO LTD
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