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Inorganic Si-ZnO-Li composite material, preparation method and application of inorganic Si-ZnO-Li composite material in lithium metal battery

A technology of lithium metal batteries and composite materials, which is applied in the field of energy storage system device materials, can solve problems such as the inability to overcome the infinite volume change of lithium metal negative electrodes, and achieve easy control and realization of reaction conditions, good electrochemical performance, and ease of volume expansion Effect

Active Publication Date: 2020-11-17
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these strategies can effectively suppress the formation and growth of Li dendrites, most methods still cannot overcome the infinite volume change problem of Li metal anodes.

Method used

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  • Inorganic Si-ZnO-Li composite material, preparation method and application of inorganic Si-ZnO-Li composite material in lithium metal battery
  • Inorganic Si-ZnO-Li composite material, preparation method and application of inorganic Si-ZnO-Li composite material in lithium metal battery
  • Inorganic Si-ZnO-Li composite material, preparation method and application of inorganic Si-ZnO-Li composite material in lithium metal battery

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Effect test

Embodiment 1

[0034] A method for preparing an inorganic Si-ZnO-Li composite material applied to the negative electrode of a lithium metal battery. The specific steps of the method are as follows:

[0035] (1) Preparation of Si-ZnO-Li molten mixture: silicon powder and zinc oxide nanoparticles are mixed with lithium flakes at a mass ratio of 1:1:2, placed in a crucible, heated to 300 ℃, stirred for 30 minutes, and a molten mixture is obtained ;

[0036] (2) Si-ZnO-Li composite material: The Si-ZnO-Li molten mixture obtained in step (1) is cooled to room temperature, and then mechanically pressed into a composite material with uniform thickness.

[0037] The composite material prepared in this embodiment cannot be pressed into electrode sheets due to the insufficient amount of Li metal. The digital photos after cooling are shown figure 1 (A).

Embodiment 2

[0039] A method for preparing an inorganic Si-ZnO-Li composite material applied to the negative electrode of a lithium metal battery. The specific steps of the method are as follows:

[0040] (1) Preparation of Si-ZnO-Li molten mixture: silicon powder and zinc oxide nanoparticles are mixed with lithium flakes at a mass ratio of 1.5:1.5:6, placed in a crucible, heated to 300 ℃, stirred for 30 minutes, and a molten mixture is obtained ;

[0041] (2) Si-ZnO-Li composite material: The Si-ZnO-Li molten mixture obtained in step (1) is cooled to room temperature, and then mechanically pressed into a composite material with a thickness of 50-500 μm, which is denoted as Li1S1Z.

Embodiment 3

[0043] A method for preparing an inorganic Si-ZnO-Li composite material applied to the negative electrode of a lithium metal battery. The specific steps of the method are as follows:

[0044] (1) Preparation of Si-ZnO-Li molten mixture: silicon powder and zinc oxide nanoparticles are mixed with lithium flakes in a mass ratio of 1:2:6, placed in a crucible, heated to 300 ℃, stirred for 30 minutes, and a molten mixture is obtained ;

[0045] (2) Si-ZnO-Li composite material: The Si-ZnO-Li molten mixture obtained in step (1) is cooled to room temperature, and then mechanically pressed into a composite material with uniform thickness, which is denoted as Li1S2Z.

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Abstract

The invention relates to an energy storage device material, in particular to an inorganic Si-ZnO-Li composite material, a preparation method and application of the inorganic Si-ZnO-Li composite material to a lithium metal battery. The inorganic Si-ZnO-Li composite material is mainly prepared by mixing and melting silicon powder, zinc oxide and lithium, the mass ratio of the silicon powder to the zinc oxide is 1: 0.5-3, and the mass ratio of the sum of the mass of the silicon powder and the mass of the zinc oxide to the mass of the lithium is 1: 1.5-3. The method disclosed by the invention is simple in preparation, and the obtained Si-ZnO-Li composite material can keep self-supporting and has good mechanical strength. The Si-ZnO-Li composite material has high lithium ion and electron diffusion rate, and can effectively improve the electrochemical performance of a lithium metal battery when being used for the lithium metal battery.

Description

Technical field [0001] The invention relates to an energy storage device material, in particular to an inorganic Si-ZnO-Li composite material, a preparation method and its application in lithium metal batteries, and belongs to the technical field of energy storage system device materials. Background technique [0002] Vigorously developing electric vehicles is one of the main means to solve the problems of carbon dioxide emissions and fossil energy consumption. With the rapid development of new energy sources, the market demand for batteries that can provide high energy density, stable recyclability, and fast charge and discharge is increasing. Lithium-ion battery (LIB) has been the main energy source in portable electronic devices since its commercialization in the 1990s, which has greatly promoted the rapid development of modern electronic technology. However, the graphite anode in lithium-ion batteries suffers from the theoretical capacity (372 mAh g -1 ) Cannot meet the incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525
CPCH01M4/382H01M4/626H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 胡毅倪长克毛杰挺
Owner ZHEJIANG SCI-TECH UNIV
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