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Inorganic si-zno-li composite material, preparation method and application in lithium metal batteries

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 good lithium affinity and mechanical strength, good electrochemical performance, and reaction conditions easy effect

Active Publication Date: 2022-06-28
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 in lithium metal batteries
  • Inorganic si-zno-li composite material, preparation method and application in lithium metal batteries
  • Inorganic si-zno-li composite material, preparation method and application in lithium metal batteries

Examples

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Effect test

Embodiment 1

[0034] A preparation method of an inorganic Si-ZnO-Li composite material applied to a 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 were mixed with lithium flakes in a mass ratio of 1:1:2, placed in a crucible, heated to 300 °C, and stirred for 30 min to obtain a molten mixture ;

[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] Due to the insufficient amount of Li metal, the composite material prepared in this example could not be pressed into an electrode sheet. The digital photo after cooling is shown in figure 1 (a).

Embodiment 2

[0039] A preparation method of an inorganic Si-ZnO-Li composite material applied to a 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 were mixed with lithium flakes in a mass ratio of 1.5:1.5:6, placed in a crucible, heated to 300 °C, and stirred for 30 min to obtain a molten mixture ;

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

Embodiment 3

[0043] A preparation method of an inorganic Si-ZnO-Li composite material applied to a 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 were mixed with lithium flakes in a mass ratio of 1:2:6, placed in a crucible, heated to 300 °C, and stirred for 30 min to obtain a molten mixture ;

[0045] (2) Si-ZnO-Li composite material: Cool the Si-ZnO-Li molten mixture obtained in step (1) to room temperature, and then mechanically press it into a composite material with a uniform thickness, 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 its application in lithium metal batteries. An inorganic Si-ZnO-Li composite material, which is mainly made by melting silicon powder, zinc oxide and lithium after mixing, wherein the mass ratio of silicon powder and zinc oxide is 1:0.5-3, silicon powder and oxide The mass ratio of zinc to lithium is 1:1.5‑3. The method of the invention is simple to prepare, and the obtained Si-ZnO-Li composite material can maintain self-support and has good mechanical strength. Si‑ZnO‑Li composites have high lithium ion and electron diffusion rates, which can effectively improve the electrochemical performance of batteries when used in lithium metal batteries.

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 rapid charge and discharge is increasing. Lithium-ion batteries (LIBs) have been the main energy source in portable electronic devices since their commercialization in the 1990s, which has greatly contributed to the rapid development of modern electronics. However, the graphite anode in Li-ion batteries suffers from the theoretical capacity (372 mAh g -1 ) and cannot meet ...

Claims

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Application Information

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Patent Type & Authority Patents(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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