Solid-state electrolyte capable of in-situ polymerization and all-solid-state battery containing solid electrolyte

Abstract

The invention discloses a solid-state electrolyte capable of in-situ polymerization and an all-solid-state battery containing the solid-state electrolyte, and the solid-state battery with a sandwich-like structure is obtained by taking PNCs as a modification layer for in-situ modification of an inorganic solid-state electrolyte and / or an organic solid-state electrolyte. The modification method provided by the invention can effectively improve the interface performance between the solid electrolyte and the electrode in situ, and the prepared polymer solid electrolyte coating has higher ionic conductivity and excellent bonding performance. Therefore, the polymer solid electrolyte can be used as the buffer layer while utilizing the excellent performance of the inorganic solid electrolyte and / or the organic solid electrolyte, and thus high-safety, high-reliability and long-life energy storage can be fundamentally realized. And the modification method can significantly increase transmission channels of lithium ions so as to reduce the transmission impedance of a solid-solid interface and protect the solid electrolyte from being reduced by the metal lithium negative electrode, thereby improving the electrochemical performance of the solid-state battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to an in-situ polymerizable solid electrolyte and an all-solid battery containing the solid electrolyte. Background technique [0002] Traditional lithium-ion batteries use flammable liquid electrolytes and graphite as the negative electrode, which not only has insufficient energy density, but also has potential safety hazards. Solid-state batteries have attracted considerable attention in next-generation energy storage devices due to their higher energy density and superior safety performance than current state-of-the-art Li-ion batteries. [0003] However, after changing the electrolyte from liquid to solid, the lithium-ion battery system transforms from the solid-liquid interface of the electrode material-electrolyte to the solid-solid interface of the electrode material-solid electrolyte. However, there is no wettability between solid and solid, and the interface contact res...

AI Technical Summary

Problems solved by technology

However, its hardness is high, and when it is in direct contact with the positive and negative electrodes and assembled, it will lead to a large interface impedance, so that lithium ions cannot pass through the positive electrode / electrolyte and electrolyte / negative electrode interfaces smoothly during charge and discharge, which will seriously affect the solid lithium. Electrochemical performance of ion batteries

At the same time, when the oxide solid electrolyte is in direct contact with the metal lithium negative electrode with strong reducibility, it will also face the problem of partial reduction of the active components of the electrolyte, which will cause a change in the electrolyte structure, thereby seriously reducing its lithium ion conductivity.

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