Sulfide solid electrolyte sheet and preparation method thereof

Abstract

The invention provides a sulfide solid electrolyte sheet and a preparation method thereof. The invention provides a sulfide solid electrolyte sheet which comprises a sulfide electrolyte material and aboron element doped in the sulfide electrolyte material, and the relative deviation (B0B100) / B0 between the mass concentration B0 of the boron element at any position on the surface of the electrolyte sheet and the mass concentration B100 of the boron element at a position 100 [mu] m away from the position does not exceed 20%. In the sulfide solid electrolyte sheet disclosed in the application, the boron element introduced into the sulfide solid electrolyte can effectively reduce the binding effect of anions on lithium ions, and improve the transmission capacity of the lithium ions; the boronelement is uniformly distributed in the sulfide solid electrolyte, the doping uniformity and the conductivity of the solid electrolyte are improved, and the surface roughness of the solid electrolytesheet is remarkably improved, so that the diffusion process of lithium ions in the sulfide solid electrolyte sheet and a lithium metal anode interface is facilitated, the interface impedance is reduced, and the cycle performance of the battery is improved.

Description

technical field

[0001] The present application relates to the field of batteries, in particular to a sulfide solid electrolyte sheet and a preparation method thereof. Background technique

[0002] In recent years, with the rapid development of consumer electronics and electric vehicles, lithium-ion batteries have become the most widely used secondary battery technology in social life. However, with the rapid increase in the number of lithium-ion battery products, negative news about lithium-ion batteries smoking, catching fire and even exploding is endless. The safety and energy density of lithium-ion batteries need to be improved.

[0003] Traditional liquid lithium batteries are difficult to avoid battery safety accidents due to the volatile and flammable characteristics of liquid electrolytes. Therefore, solid electrolytes have attracted attention as an alternative product with higher safety performance. The existing solid electrolytes can be divided into three categorie...

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