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Metal lithium negative electrode material, as well as preparation method and application thereof

A technology of negative electrode material and metal lithium, applied in the field of metal lithium negative electrode material and its preparation, can solve the problems of poor electrode conductivity and dendrite growth, and achieve the effects of improving conductivity, preventing side reactions and stabilizing structure.

Active Publication Date: 2019-06-28
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of metal lithium negative electrode material to solve the problems of poor electrical conductivity and dendrite growth of existing metal lithium as an electrode

Method used

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  • Metal lithium negative electrode material, as well as preparation method and application thereof
  • Metal lithium negative electrode material, as well as preparation method and application thereof
  • Metal lithium negative electrode material, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of the metal lithium negative electrode material of the present embodiment comprises the following steps:

[0029] (1) After mixing the ground ferric fluoride and the binder polyvinylidene fluoride, coat it on the copper foil and dry it in a vacuum oven;

[0030] (2) Surface polishing is carried out on the metal lithium placed in the argon atmosphere until the metal lithium surface presents a metallic luster;

[0031] (3) bonding and compacting the polished lithium metal to the iron fluoride pole piece in step (1);

[0032] (4) heating the metal lithium bonded with the metal fluoride in (3) for 2 hours, and the heating temperature is 60° C.;

[0033] (5) The metal lithium and the iron fluoride pole pieces are separated, and the surface residues of the metal lithium are cleaned with ethylene carbonate to prepare the metal lithium negative electrode material.

[0034] A protective layer of lithium fluoride and metallic iron is formed on the surfac...

Embodiment 2

[0036] The preparation method of the metal lithium negative electrode material of the present embodiment comprises the following steps:

[0037] (1) After the aluminum fluoride after grinding is mixed with the binder polytetrafluoroethylene, it is coated on the copper foil and dried in a vacuum oven;

[0038] (2) polishing the surface of the lithium aluminum alloy placed in an argon atmosphere until the surface of the lithium aluminum alloy presents a metallic luster;

[0039] (3) bonding and compacting the polished lithium aluminum alloy to the aluminum fluoride pole piece in step (1);

[0040] (4) Heating the lithium aluminum alloy bonded with aluminum fluoride in (3) for 6 hours at a heating temperature of 80°C;

[0041] (5) The lithium aluminum alloy and the aluminum fluoride pole piece are separated, and the surface residue of the lithium aluminum alloy is cleaned with dimethyl carbonate to obtain a metal lithium negative electrode material.

[0042] A protective layer ...

Embodiment 3

[0044] The preparation method of the metal lithium negative electrode material of the present embodiment comprises the following steps:

[0045] (1) After the zinc fluoride after grinding is mixed with the binder polyacrylic acid, it is coated on the copper foil and dried in a vacuum oven;

[0046] (2) The lithium-zinc alloy placed in an argon atmosphere is surface-polished until the surface of the lithium-zinc alloy presents a metallic luster;

[0047] (3) Laminating and compacting the polished lithium-zinc alloy with the zinc fluoride pole piece in step (1);

[0048] (4) Heating the lithium-zinc alloy bonded with zinc fluoride in (3) for 12 hours at a heating temperature of 100°C;

[0049] (5) The lithium-zinc alloy and the zinc fluoride pole piece are separated, and the surface residue of the lithium-zinc alloy is cleaned with diethyl carbonate to obtain a metal lithium negative electrode material.

[0050] A protective layer of lithium fluoride and lithium-zinc alloy is ...

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Abstract

The invention discloses a metal lithium negative electrode material, as well as a preparation method and the application thereof, and belongs to the field of lithium battery materials. According to the invention, the metal fluoride is hot-pressed on the metal lithium and a replacement reaction occurs between the metal fluoride and the metal lithium. Through the replacement reaction, a uniform andstable protective layer with excellent electronic conductivity and ionic conductivity is formed on the surface of metal lithium. In this way, the side reaction between the metal lithium and the electrolyte can be prevented. Meanwhile, the uniform deposition of lithium ions is facilitated through high ion mobility and electronic conductivity of the surface of the metal lithium. The generation of lithium dendrites is effectively inhibited, and the service life of a battery is prolonged. Meanwhile, the preparation method disclosed by the invention is simple, simple and convenient to operate and low in equipment requirement.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a metal lithium negative electrode material and a preparation method and application thereof. Background technique [0002] In recent years, digital 3C products, new energy vehicles, etc. have increasingly demanded high-energy-density energy storage equipment, and the energy density of traditional lithium-ion batteries has been unable to meet the requirements. Metal lithium anode has become a research hotspot because of its extremely high specific capacity of 3860mAh / g and the lowest reduction potential of -3.04V (vs. SHE). [0003] However, due to the low Coulombic efficiency and dendrite growth problems of lithium metal during cyclic charge and discharge, it is difficult to be applied. On the one hand, due to the active chemical characteristics of metallic lithium, it can continuously have side reactions with the electrolyte and consume the electrolyte; on th...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/134H01M4/04H01M10/052
CPCY02E60/10
Inventor 王丽平蒋澄牛晓滨
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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