Lithium metal battery electrolyte and lithium metal battery

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...

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 layer on the surface of the lithium metal layer, so that lithium ions can be more uniformly deposited on the surface of the lithium negative electrode, thereby solving the problem of dendrite growth The problem is to improve the cycle coulombic efficiency of lithium metal batteries. This method is complex to operate, especially on the surface of active lithium metal, and it is difficult to make uniform

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