Lithium metal battery electrolyte and lithium metal battery

A lithium metal battery and electrolyte technology, applied in the field of lithium ion batteries, can solve problems such as complex operation, low room temperature conductivity of the electrolyte, and difficulty in manufacturing

Active Publication Date: 2019-03-19
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

The method is complicated to operate, and there are many uncontrollable factors in the process of making the electrolyte, and the room temperature conductivity of the prepared electrolyte is still lower than that of the liquid electrolyte.
[0006] In the CN201710774888.8 patent, it is disclosed that a lithium-ion battery negative electrode material sputters and deposits a lithium-silicon alloy la...

Method used

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  • Lithium metal battery electrolyte and lithium metal battery
  • Lithium metal battery electrolyte and lithium metal battery
  • Lithium metal battery electrolyte and lithium metal battery

Examples

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preparation example Construction

[0039] The present invention has no special restrictions on the preparation method of the electrolyte. Before the vegetation is covered, the lithium salt additive and the non-lithium salt are kept fully dry, and the non-aqueous solvent is dehydrated by molecular sieves for more than 24 hours. After the above pretreatment is completed, the above three The raw materials are mixed to obtain an electrolyte solution.

[0040] The present invention also provides a lithium metal battery, comprising a positive electrode, a negative electrode and an electrolyte;

[0041] The negative electrode is lithium metal;

[0042] The electrolyte is the above-mentioned electrolyte for lithium metal batteries.

[0043] In the present invention, there is no special limitation on the type of the positive electrode in the lithium metal battery, and the positive electrode of the lithium metal battery commonly used by those skilled in the art can be used.

[0044] The invention provides an electrolyt...

Embodiment 1

[0047] The electrolyte with the following formula is: 1mol / L LiTFSI, 0.3mol / L NaFSI, and the non-aqueous solvent is dimethyl ether (DME) and ethylene glycol methylene ether (DOL) with a volume ratio of 1:1.

[0048] Metal lithium is used as the negative electrode, and the above-mentioned electrolyte solution is assembled into a lithium-lithium symmetrical battery and a lithium-copper battery respectively.

Embodiment 2

[0050] The electrolyte and the lithium metal battery were obtained according to the formula and materials in Example 1, except that 0.5 mol / L NaFSI was used in this example.

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Abstract

The invention provides a lithium metal battery electrolyte. The lithium metal battery electrolyte is composed of lithium salt, additives and non-aqueous solvent, wherein the additives are one or moreselected from NaBOB, NaTFSI, NaFSI, NaPF6, NaBF4, (C3H3NaO2)n, Na2SO4, Mg(FSI)2, Mg(TFSI)2, KFSI and KTFSI, and the concentration of the additives of the lithium metal battery electrolyte is 0.2-0.5 mol/L; the non-aqueous solvent is one or more selected from carbonate organic solvent, phosphate organic solvent and ether organic solvent. The lithium metal battery electrolyte can form an SEI (solidelectrolyte interface) layer on the surface of a metal lithium negative electrode during a constant current charging and discharging process to improve the safety performance, the utilization rate andthe cycling stability of a lithium metal battery. The invention also provides the lithium metal battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to an electrolyte solution for a lithium metal battery and the lithium metal battery. Background technique [0002] As one of the current mainstream energy storage devices, lithium-ion batteries are widely used in new energy vehicles, various portable electronic devices and communication equipment. With the continuous progress of the downstream field of lithium-ion batteries, especially the explosive development of the new energy vehicle industry, people have put forward higher requirements for the mass energy density and volume energy density of lithium-ion batteries. [0003] Lithium metal batteries use metal lithium as the negative electrode of the battery. Lithium metal negative electrodes are currently a research hotspot due to their high specific capacity and the most negative potential. However, due to the growth of lithium dendrites in the negative electrode d...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/0569H01M10/4235H01M2300/0025H01M2300/0028H01M2300/0037Y02E60/10
Inventor 许和伟石俊黎赵斐何盈刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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