Solid-state electrolyte and solid-state battery containing same

Abstract

The invention discloses a solid-state electrolyte and a solid-state battery containing the solid-state electrolyte. The solid-state electrolyte is a polymer solid-state electrolyte, and the polymer is obtained by polymerizing a composition comprising the following components: polyester polyol, polysiloxane, electrolyte salt, diisocyanate, an additive, a chain extender and metal chloride. The solid electrolyte disclosed by the invention has excellent chain segment movement capability and rich lithium ion migration sites, cannot be broken under relatively large stress in a circulation process, and can be self-healed even after being broken under limiting conditions. The excellent tear resistance of the solid electrolyte elastomer is derived from a strong and tough dynamic microphase separation structure formed in the solid electrolyte elastomer, and meanwhile, the solid electrolyte also has rigidity and certain elasticity, so that the problem of electrode expansion of the solid battery in the circulating process can be effectively inhibited; and the safety performance of the battery is further improved.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage batteries, in particular to a solid electrolyte and a solid battery containing the solid electrolyte. Background technique [0002] Lithium battery is one of the fastest growing batteries at present. However, with the increasing market demand for lithium batteries, the safety of lithium batteries has become increasingly prominent. Many spontaneous combustion accidents in mobile phones and cars are caused by a short circuit inside the battery that generates a lot of heat, causing the internal electrolyte to decompose. The use of solid electrolytes instead of organic electrolytes is expected to fundamentally solve the above problems. [0003] Solid electrolytes include inorganic solid electrolytes and organic polymer solid electrolytes. Although dendrite growth is inhibited to a certain extent and the safety problem of liquid leakage is solved, there is also the problem that...

AI Technical Summary

Problems solved by technology

For example, the key materials of solid-state batteries are all solid / solid rigid interfaces, so interfacial gaps are likely to exist between the layers of key materials, resulting in poor contact problems.

In addition, the volume change of high specific energy electrode materials such as metal lithium will cause great strain during cycling, and the uneven deposition of lithium will easily lead to the generation of lithium dendrites, which will eventually lead to the destruction of the interface, which will seriously affect the solid-state battery. Stable energy output and improved cycle life

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