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Interface protection structure and preparation method thereof and battery having interface protection structure

An interface protection and battery technology, applied in the field of electrochemical energy storage, can solve the problems of inability to block the direct contact between electrolyte and lithium metal, complicated interface or structure nanotechnology, loss of lithium metal and electrolyte, etc., and is conducive to large-scale Promote, improve Coulombic efficiency and cycle life, and improve the effect of energy density

Active Publication Date: 2019-12-17
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above aspects prolong the life of the lithium battery and improve the battery cycle performance to a certain extent, there are still problems such as SEI will still be broken and repaired, and the lithium metal and electrolyte will be lost; the direct contact between the electrolyte and lithium metal cannot be blocked; so Nanotechnology involving interfaces or structures is too complex to be industrialized

Method used

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  • Interface protection structure and preparation method thereof and battery having interface protection structure
  • Interface protection structure and preparation method thereof and battery having interface protection structure
  • Interface protection structure and preparation method thereof and battery having interface protection structure

Examples

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Effect test

Embodiment 1

[0053] The invention provides an interface protection structure, which is made of a main material, and the main material adopts foamed graphene (FG). The preparation method is as follows:

[0054] Take 30mg of FG powder, put it into a mixture of pure water and ethanol (1:1 volume ratio, about 50ml) for ultrasonic dispersion, and then simply suction filter and peel off to obtain the interface protection structure. The Buchner funnel is used for suction filtration on qualitative filter paper, and then the obtained interface protection structure can be cut to form the required specifications.

[0055] The interface protection structure obtained in this example was assembled as a half-cell according to the above-mentioned button-type lithium metal secondary half-cell assembly method.

Embodiment 2

[0057] The invention provides an interface protection structure, which is made of a host material, which is a powder mixed with foamed graphene (FG) and carbon nanotubes (CNT) at a mass ratio of 9:1. The preparation method is as follows:

[0058] Take 30mg of FG+CNT powder, put it into a mixture of pure water and ethanol (1:1 volume ratio, about 50ml) for ultrasonic dispersion, and then simply suction filter and peel off to obtain the interface protection structure. 70mm qualitative filter paper is used for suction filtration with a Buchner funnel, and then the obtained interface protection structure can be cut to form the required specifications.

[0059] The interface protection structure obtained in this example was assembled as a half-cell according to the above-mentioned button-type lithium metal secondary half-cell assembly method.

Embodiment 3

[0061] The difference between Example 3 and Example 2 is that the mass ratio of the two in FG+CNT powder is changed to 8:2. Others are the same as embodiment 2.

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Abstract

The invention provides an interface protection structure which comprises a main body material, wherein the main body material is a carbon-based material and comprises at least one of foam graphene (FG), carbon nanotubes (CNT) and carbon fibers. The interface protection structure is prepared by dispersing raw materials in a dispersion liquid, and then, performing suction filtration and stripping. The interface protection structure is a self-supporting structure and is formed without the help of a binder, has a certain flexibility and can be further applied to a flexible battery, can suppress dendrite growth and volume change of a lithium metal battery in the charging and discharging process and block direct contact between electrolyte and lithium metal, and improves coulombic efficiency andcycle life of the battery. The preparation raw materials of the interface protection structure are easy to obtain, and the preparation method is simple and easy to implement; the interface protectionstructure can be directly applied to existing lithium metal battery products; and large-scale popularization is facilitated.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a lithium metal battery interface protection structure and a preparation method thereof. Background technique [0002] Commercial lithium-ion batteries with graphite as the negative electrode have the advantages of low self-discharge rate, no memory effect, and long cycle life. Peak-filling valley fields. However, there is a theoretical specific capacity (372mAh g -1 ) is low, and the first cycle will cause a large amount of irreversible capacity loss and other deficiencies; at the same time, the current single energy density of lithium-ion batteries is about 200Wh / kg (the theoretical limit is about 400Wh / kg), which is far from reaching the U.S. Department of Energy. The "Battery 500" (that is, battery pack energy density of 500Wh / kg) program requirements cannot meet the requirements of high energy density in emerging application fields, and its application in emer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/628H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 彭哲王木钦任飞鸿林欢李振东王德宇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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