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Method for treating lithium metal with fluoroethylene carbonate and application of lithium metal in solid-state batteries

A technology of fluoroethylene carbonate and metal lithium, which is applied in the direction of lithium batteries, battery electrodes, metal material coating technology, etc., can solve the problems of lithium dendrite growth, poor compatibility of metal lithium/solid electrolyte interface, etc., and achieve cycle The effects of improved performance, low cost, and simple preparation method

Active Publication Date: 2018-08-31
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the problems existing in the above-mentioned prior art, the present invention aims to provide a method for processing lithium metal with fluoroethylene carbonate and its application in solid-state batteries. The poor compatibility of metal lithium / solid electrolyte interface and the problem of lithium dendrite growth in solid-state batteries have obvious effects, and are suitable for large-scale commercial production

Method used

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  • Method for treating lithium metal with fluoroethylene carbonate and application of lithium metal in solid-state batteries
  • Method for treating lithium metal with fluoroethylene carbonate and application of lithium metal in solid-state batteries
  • Method for treating lithium metal with fluoroethylene carbonate and application of lithium metal in solid-state batteries

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Embodiment 1

[0026] 1. A method for processing lithium metal with fluoroethylene carbonate, comprising the steps of: in the glove box, dipping cyclohexane with a nylon brush to wipe lithium metal to remove the oxide layer on the surface, and then lithium metal Immerse in fluoroethylene carbonate, take out the lithium metal after 2 hours, and dry it on a constant temperature heating plate at 60°C to obtain the lithium negative electrode material.

[0027] 2. A solid-state battery: comprising the following steps:

[0028] (1) Preparation of negative electrode material: the negative electrode material is the lithium negative electrode material prepared in this embodiment.

[0029] (2) Preparation of positive electrode material: Weigh LiFePO with a mass ratio of 7:1:2 4 , super P and PEO (LITFSI) were dispersed in tetrahydrofuran, and after stirring for 12 hours, the slurry was uniformly coated on aluminum foil, dried in vacuum at 80°C for 12 hours, and cut into pieces for later use.

[0030...

Embodiment 2

[0032] 1. A method for processing lithium metal with fluoroethylene carbonate, comprising the steps of: in the glove box, dipping cyclohexane with a nylon brush to wipe lithium metal to remove the oxide layer on the surface, and then lithium metal Immerse in fluoroethylene carbonate, take out the lithium metal after 5 hours, and dry it on a constant temperature heating plate at 100°C to obtain the lithium negative electrode material.

[0033] 2. A solid-state battery: comprising the following steps:

[0034] (1) Preparation of negative electrode material: the negative electrode material is the lithium negative electrode material prepared in this embodiment.

[0035] (2) Preparation of positive electrode material: Weigh LiFePO with a mass ratio of 7:1:2 4 , super P and PEO (LITFSI) were dispersed in tetrahydrofuran, and after stirring for 12 hours, the slurry was uniformly coated on aluminum foil, dried in vacuum at 80°C for 12 hours, and cut into pieces for later use.

[003...

Embodiment 3

[0038] 1. A method for processing lithium metal with fluoroethylene carbonate, comprising the steps of: in the glove box, dipping cyclohexane with a nylon brush to wipe the lithium aluminum alloy to remove the oxide layer on the surface, and then place the lithium The alloy is immersed in fluoroethylene carbonate, taken out after 10s, and dried on a constant temperature heating plate at 100°C to obtain the lithium negative electrode material.

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Abstract

The invention relates to a method for treating the surface of lithium metal with fluoroethylene carbonate and an application of the lithium metal in solid-state batteries, and belongs to the technicalfield of preparation of negative electrode materials for lithium batteries. The method comprises that a lithium negative electrode is immersed in fluoroethylene carbonate, and then taken out and subjected to drying treatment to volatilize a residual liquid on the surface. The method is simple and easy to operate and easy to control, has obvious effect on solving the problems of poor compatibilityof lithium metal / solid electrolyte interfaces and lithium dendrite growth in conventional solid-state batteries, and is suitable for large-scale commercialized production.

Description

technical field [0001] The invention belongs to the field of preparation of lithium negative electrode materials, and in particular relates to a method for treating metal lithium with fluoroethylene carbonate and its application in solid-state batteries. Background technique [0002] In recent years, with the rapid development of electric vehicles and high-end portable electronic devices, the demand for high energy density batteries has become more and more urgent. Metal lithium up to 3860mAhg -1 The ultra-high specific capacity and the lowest electrochemical potential (-3.04V relative to the standard hydrogen electrode) make it the ultimate negative electrode for high energy density lithium batteries. In addition, at this stage, lithium metal batteries represented by lithium-sulfur batteries and lithium-air batteries are considered to be the most promising next-generation energy storage systems. However, metal lithium will generate lithium dendrites during cycling, thus r...

Claims

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Application Information

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IPC IPC(8): C23C22/02H01M4/1395H01M4/134H01M10/052
CPCC23C22/02H01M4/134H01M4/1395H01M10/052Y02E60/10
Inventor 慈立杰侯广梅艾青彭瑞芹
Owner SHANDONG UNIV