Lithium silicon alloy and preparation method and application thereof

A lithium-silicon alloy and alloy technology, applied in the field of materials, can solve the problems of limited efficiency and volume change in the first week, and achieve the effect of simple and easy preparation method, small volume change and uniform structure

Pending Publication Date: 2022-03-01
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is limited to improve the efficiency of the first week
In order to improve the first-week efficiency, a common strategy is to use pre-lithiation, but this method cannot solve the problem of volume change during cycling

Method used

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  • Lithium silicon alloy and preparation method and application thereof
  • Lithium silicon alloy and preparation method and application thereof
  • Lithium silicon alloy and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A lithium-silicon alloy material, the preparation method is as follows:

[0028] Take 10g of calcium silicide alloy, heat-treat at 900°C for 2 hours by vacuum distillation method, and obtain two-dimensional silicon material;

[0029] Two-dimensional silicon is coated on copper foil and assembled into a lithium-ion battery. The electrolyte is 1M LiPF6 / EC+DEC, and the current density is 100mA g -1 , the discharge voltage is 0.01V, and after the discharge is completed, a two-dimensional lithium-silicon alloy can be obtained.

[0030] The two-dimensional silicon material obtained in the preparation method was analyzed by figure 1 It can be seen from the XRD pattern that no other miscellaneous peaks appear in the figure, indicating that elemental silicon was successfully prepared from calcium silicide alloy by vacuum distillation. And from image 3 It can be clearly seen from the SEM image that the synthesized two-dimensional silicon material presents an obvious layered s...

Embodiment 2

[0033] A lithium-silicon alloy material, the preparation method is as follows:

[0034] Take 10g of magnesium silicide alloy and heat-treat it at 800°C for 2 hours by vacuum distillation to obtain porous silicon material;

[0035] Porous silicon is coated on copper foil and assembled into a lithium-ion battery. The electrolyte uses 1M LiPF 6 / EC+DEC, the current density is 100mA·g -1 , the discharge voltage is 0.01V, and the porous lithium-silicon alloy can be obtained after the discharge is completed.

Embodiment 3

[0037] A lithium-silicon alloy material, the preparation method is as follows:

[0038] Take 10g of calcium silicide alloy and heat-treat it at 800°C for 5 hours by vacuum distillation to obtain a two-dimensional silicon material;

[0039] Two-dimensional silicon is coated on copper foil and assembled into a lithium-ion battery. The electrolyte uses 1M LiPF 6 / EC+DEC, the current density is 200mA·g -1 , the discharge voltage is 0.01V, and after the discharge is completed, a two-dimensional lithium-silicon alloy can be obtained.

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Abstract

The invention relates to a lithium-silicon alloy and a preparation method and application thereof. The lithium-silicon alloy can be prepared by assembling and discharging a conventional lithium ion battery; in the lithium-silicon alloy prepared by the invention, the microstructure is two-dimensional layered / three-dimensional porous, so that the volume change in the circulation process can be buffered. In addition, lithium is embedded in advance in the discharging process, so that the first-cycle efficiency is high; in the process, the lithium-silicon alloy is synthesized by an electrochemical method, so that the structure is extremely uniform.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a lithium-silicon alloy and its preparation method and application. Background technique [0002] Among the electrode materials of lithium-ion batteries, the silicon negative electrode will produce a large volume change during the cycle, which will cause the electrode material to be pulverized and broken, and the electrolyte to be consumed, which will further lead to a rapid capacity decay. In addition, the solid electrolyte film formed in the first week and the side reactions between the silicon negative electrode and the electrolyte will cause the efficiency of the silicon negative electrode to be low in the first week, and the continuous destruction and reorganization of the solid electrolyte film during the cycle will further consume lithium ions. , resulting in low Coulombic efficiency. In order to solve the above-mentioned problems in silicon, many methods ha...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/40H01M10/0525H01M10/058C25D3/56C25D7/00
CPCH01M4/386H01M4/405H01M10/058H01M10/0525C25D3/56C25D7/00Y02E60/10Y02P70/50
Inventor 冯金奎安永灵
Owner SHANDONG UNIV
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