A solid-state battery capable of operating at room temperature and its preparation method

Abstract

The invention relates to a solid-state battery capable of operating at room temperature and a preparation method thereof. The solid-state battery includes a positive electrode, a negative electrode, and a solid electrolyte film. The negative electrode includes metal lithium and an interface protection film formed on the surface of the metal lithium. The interface protection film processes the metal through a treatment solution. Lithium is formed, the treatment liquid includes a solute and a solvent, the solute is one or more combinations of lithium difluorophosphate, lithium hexafluorophosphate, lithium difluorobis(oxalato)phosphate, and lithium tetrafluorooxalate phosphate, and the solvent is dimethyl sulfoxide One or more of dimethylformamide; solid-state batteries also include liquid substances dripped on the solid electrolyte membrane, and the liquid substances are one or more of propylene carbonate, r-butyrolactone, and ethylene carbonate. Various combinations. The solid-state battery of the present invention can operate at room temperature, thereby reducing thermal management costs and improving the safety of the solid-state battery; the positive and negative electrodes have good compatibility with the solid-state electrolyte membrane, low interface impedance, and high lithium ion migration rate.

Description

technical field [0001] The invention belongs to the field of new energy, and in particular relates to a solid-state battery capable of operating at room temperature and a preparation method thereof. Background technique [0002] At present, commercial lithium-ion batteries generally use organic liquid electrolytes and gel electrolytes, which inevitably introduce volatile, flammable, and explosive organic liquids into the battery system, which brings serious safety hazards to the battery system. Therefore, replacing the electrolyte with a solid electrolyte and developing an all-solid-state lithium-ion battery is the only way to fundamentally solve the safety problem. The structure of the all-solid-state battery includes a positive electrode, a solid-state electrolyte, and a negative electrode. The solid-state electrolyte acts as a separator to hinder electron transmission while conducting lithium ions, which greatly simplifies the battery construction process. [0003] In ad...

AI Technical Summary

Problems solved by technology

Although there is basically no side reaction of solid electrolyte decomposition at the interface between the solid electrolyte and the electrode material, the solid properties make the electrode / electrolyte interface compatibility poor, and the high interface impedance seriously affects the ion transmission, which ultimately leads to the difficulty in the actual capacity of the solid-state battery. fully play

[0004] In order to solve the high interface impedance of solid-state batteries, in the prior art, solid-state batteries usually operate at high temperatures (generally 60°C), that is, charge and discharge at high temperatures, which makes the thermal management cost of solid-state batteries high

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