All-solid-state battery and preparation method thereof

Abstract

The invention relates to the technical field of all-solid-state batteries, and specifically discloses an all-solid-state battery and a preparation method thereof. The all-solid-state battery comprisesa positive plate, a negative plate and a solid-state electrolyte plate located between the positive plate and the negative plate, wherein the solid-state electrolyte plate is made of a first solid-state electrolyte material, and the positive plate is made of a positive electrode material and a second solid-state electrolyte material. The all-solid-state battery improves the intrinsic properties and electrochemical performance of the battery, and improves the ion conductivity of the solid-state electrolyte. In addition, the all-solid-state battery is simple in preparation process, has repeatability and mass production and has great application and popularization values.

Description

technical field [0001] The invention relates to the technical field of all-solid-state batteries, in particular to an all-solid-state battery and a preparation method thereof. Background technique [0002] New energy vehicles put forward higher requirements for power batteries. In addition to meeting the requirements of long cruising range and high-power charging and discharging, the safety of automotive power lithium batteries is particularly important. At present, commercial lithium-ion batteries release a large amount of heat when a short circuit occurs, which will ignite the organic electrolyte and cause an explosion hazard, which is obviously difficult to be widely used. Even the Tesla car, which is currently considered the safest, uses a complex battery management system and protective measures, and there have been many fire and explosion accidents in just a few years after it came out. In addition, there are still problems with organic electrolytes: limited electroc...

AI Technical Summary

Problems solved by technology

At present, commercial lithium-ion batteries release a large amount of heat when a short circuit occurs, which will ignite the organic electrolyte and cause explosion hazards. Obviously, it is difficult to be widely used.

Even the Tesla car, which is currently considered the safest, uses a complex battery management system and protective measures, and there have been many fire and explosion accidents in just a few years after it came out

In addition, there are still problems with organic electrolytes: limited electrochemical window, difficult to be compatible with metal lithium anodes and newly developed high-potential cathode materials; lithium ions are not the only carriers, and the internal resistance of the battery will be affected by the The appearance of the ion concentration gradient increases (concentration polarization), and the performance of the battery decreases; the working temperature is limited (safe working temperature 0-40°C); it reacts with the negative electrode material to form a solid electrolyte interphase (SEI) layer, resulting in two materials Continuous consumption, so that the battery capacity continues to decline

However, this solid-state battery is always a solid-state battery with a sulfide solid-state electrolyte, which cannot suppress the shuttle effect of polysulfides in the solid-state electrolyte in practical applications, and the production of solid-state batteries needs to be produced and stored under an inert atmosphere such as argon, which is easy high production cost

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