Solid electrolyte material, electrolyte and lithium battery, and preparation methods thereof

Abstract

The invention discloses a solid electrolyte material, an electrolyte and a lithium battery, and preparation methods thereof. The electrolyte material comprises a core and a coating, the core is a carbon-based conductor material, the surface of the core is coated with the coating, and the coating is an inorganic ceramic material. The electrolyte material has the coating, so the electron conducting characteristic of the carbon-based conductor material is shielded; and the carbon-based conductor material is introduced into the solid electrolyte material, so the ion mobility of the solid electrolyte is improved, the generation of lithium dendrites is restricted, and the stability of the electrolyte in air is improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a solid electrolyte material, an electrolyte, a lithium battery and a preparation method thereof. Background technique [0002] With the popularity of electronic products in recent years, lithium batteries as their power sources have become more and more popular due to their advantages such as light weight, small size, high working voltage, high energy density, high output power, high charging efficiency and no memory effect. Pay attention to. And in the fields of power tools, electric vehicles, and large-scale energy storage, there are increasingly higher requirements for the safety and performance of lithium batteries. [0003] Currently commercially available lithium batteries are usually composed of a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and a casing. Among them, the electrolyte mostly uses organic electrolytes with flammable or...

AI Technical Summary

Problems solved by technology

Although the ion mobility of the former can reach the level of liquid electrolyte (10 -2 S / cm), but the inorganic material has poor elasticity and cannot be in close contact with lithium metal, resulting in hindered ion transmission, and these sulfur-phosphorus inorganic compound materials are chemically unstable and sensitive to oxygen and water vapor in the air, which affects the charge and discharge of the battery. Cycles

Although the polymer coating material has good elasticity and can be in close contact with lithium metal, its ion mobility is low, which seriously limits the use of lithium batteries.

Most of the solutions at this stage are to incorporate inorganic ceramic compounds containing fast ion conductors into polymers, combining the elasticity of polymers and the high ion mobility of fast ion conductors, but the improvement of mobility Still limited, can never reach the level of liquid electrolyte

[0005] Electrolyte materials in the prior art can only choose materials that conduct ions and do not conduct electrons, which limits the selection range of electrolyte materials, and it is difficult to find materials that have high ion mobility, do not conduct electrons, and can exist stably in the air

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