Metal lithium negative electrode for lithium battery and lithium battery

A metal lithium and lithium battery technology, which is applied in the field of metal lithium negative electrodes, can solve the problems of not achieving the practical effect of metal lithium, reactive side reactions, loss of active materials, etc., and achieves suppression of side reactions, stable properties, and high stability. Effect

Inactive Publication Date: 2020-06-02
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium metal negative electrode still has the following problems: 1. The high reactivity of lithium metal causes the occurrence of side reactions in the process of charging and discharging reactions; 2. The generation of lithium metal dendrites causes safety problems such as short circuit of the battery; 3. The "dead lithium" produced by the shedding of crystals causes the loss of active materials
[0005] Although the use of the above-mentioned modified protection method can improve the performance of lithium metal, it has not achieved the practical effect of lithium metal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of lithium battery:

[0026] First prepare the metal lithium foil negative electrode loaded with tricobalt tetroxide on the surface, put the metal lithium into the magnetron sputtering chamber in the form of roll-to-roll, and then put the sputtering target containing tricobalt tetroxide into the magnetron sputtering target position, set the sputtering Parameters: sputtering vacuum 2Pa, reaction gas of argon, deposition power of 120W, deposition time of 15 minutes, the thickness of obtained cobalt tetroxide layer is 0.5 micron, and the thickness of metal lithium foil is 100 micron. Choose Li[Ni 1 / 3 CO 1 / 3 mn 1 / 3 ]O is the positive electrode material, the aluminum foil is the positive electrode current collector, and the electrolyte contains LiPF 6 The concentration is 1mol / L, the volume ratio of organic solvent PC:DMC:EMC=1:1:1, the aluminum tab is the lead terminal, and the soft pack battery packed with aluminum-plastic film is prepared according to the m...

Embodiment 2

[0028] First prepare the metal lithium foil negative electrode loaded with cobalt-lanthanum composite oxide on the surface, put the metal lithium into the magnetron sputtering chamber in the form of roll-to-roll, and then put the sputtering target containing the mixture of tricobalt tetroxide and lanthanum oxide into the magnetron sputtering On the target position, set the sputtering parameters: the sputtering vacuum is 1Pa, the reaction gas is argon, the deposition power is 150W, and the deposition time is 10 minutes. The thickness of the obtained cobalt-lanthanum composite oxide layer is 1 micron, and the thickness of the metal lithium foil It is 150 microns, and the surface is covered with a conductive layer of carbon nanotubes with a thickness of 0.5 microns. Choose LiFePO 4 It is the positive electrode material, the aluminum foil is the positive electrode current collector, and the electrolyte contains LiPF 6 The concentration is 1mol / L, the volume ratio of organic solve...

Embodiment 3

[0030] First prepare the metal lithium foil negative electrode with copper sulfide on the surface, put the metal lithium boron alloy into the magnetron sputtering chamber in the form of roll-to-roll, and then put the sputtering target containing copper sulfide into the magnetron sputtering target position , set the sputtering parameters: the sputtering vacuum is 1.5Pa, the reaction gas is argon, the deposition power supply is 100W, and the deposition time is 10 minutes. 10 microns with 80% lithium content. Choose LiCoO 2 It is the positive electrode material, the aluminum foil is the positive electrode current collector, and the electrolyte contains LiPF 6 The concentration is 1mol / L, the volume ratio of organic solvent PC:DMC:EC:EMC=1:1:1:1, the aluminum tab is the lead terminal, and the soft pack battery packaged in aluminum plastic film is prepared according to the method in the prior art. The pouch battery is tested under the condition of 0.1C charge and discharge rate, ...

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Abstract

The invention relates to a metal lithium negative electrode for a lithium battery. The metal lithium negative electrode comprises a metal lithium substrate and a compact inorganic compound surface layer, wherein the metal lithium substrate comprises metal lithium and alloy thereof, and the inorganic compound surface layer is a metal compound which can be subjected to an in-situ oxidation-reductionreaction with the metal lithium in an electrolyte to generate a lithium compound and nano metal particle composite structure. The compact inorganic surface layer of the metal lithium negative electrode can spontaneously react with metal lithium when electrolyte is injected into the battery; a lithium compound phase with high ionic conductivity is generated; meanwhile, nano metal particle phases which are uniformly distributed are generated in the lithium compound phase, and the inorganic surface layer has an electronic conductivity characteristic due to nano metal particles, so a continuous non-porous complex-phase structure compact inorganic surface layer with an ion and electron mixed conductivity characteristic is formed. When the metal lithium with the inorganic surface layer is usedin a lithium battery, the side reaction of the metal lithium can be effectively inhibited, the safety of the battery is improved, and the cycle life is prolonged.

Description

technical field [0001] The invention relates to the field of chemical power sources, in particular to a metallic lithium negative electrode for lithium batteries. Background technique [0002] Chemical power sources are becoming more and more important in the national economy. Compared with secondary battery systems such as lead-acid batteries, nickel-cadmium batteries, and nickel-metal hydride batteries, lithium-ion secondary batteries have higher specific energy, higher specific power, and higher energy efficiency. With advantages such as long cycle life, it has become the first choice for secondary energy storage batteries in emerging fields such as electric vehicles and wind power generation energy storage. [0003] As countries around the world pay more and more attention to energy and environmental issues, electric vehicles and wind-solar energy storage technologies have developed rapidly, and the energy density of secondary batteries is one of the key factors that lim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M10/052
CPCH01M4/134H01M10/052Y02E60/10
Inventor 王崇陈剑
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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