Aluminum-lithium alloy composite negative electrode sheet for solid-state battery and preparation method and application thereof

Abstract

The invention discloses an aluminum-lithium alloy composite negative electrode sheet for a solid-state battery, and the aluminum-lithium alloy composite negative electrode sheet is characterized by comprising aluminum-lithium alloy powder, propylene carbonate, a conductive agent, a binder, polyethylene oxide and a lithium salt. A preparation method of the aluminum-lithium alloy composite negativeelectrode sheet is as follows: aluminum-lithium alloy powder is immersed in a propylene carbonate solution under an inert atmosphere, and an immersed aluminum-lithium alloy powder and propylene carbonate mixed material is taken out; the immersed aluminum-lithium alloy powder and propylene carbonate mixed material and the conductive agent are blended in a vacuum mixer; mixed powder and the binder are uniformly dispersed in a NMP solution, and the polyethylene oxide and the lithium salt are injected to form a complex dielectric; and the complex dielectric obtained in the step 3 is fully mixed evenly in the vacuum mixer to obtain composite negative electrode slurry. Advantages are that the aluminum-lithium alloy powder is aluminum and lithium mixed alloy powder, and a battery system with thelithium-aluminum alloy as a negative electrode has high energy, high power density, long storage period, compact structure and long cycle life.

Description

technical field [0001] The invention relates to the field of new energy lithium batteries, in particular to an aluminum-lithium alloy composite negative electrode sheet for a solid-state battery, a preparation method for an aluminum-lithium alloy composite negative electrode sheet for a solid-state battery, and an aluminum-lithium alloy composite negative electrode sheet for a solid-state battery. Application of lithium alloy composite negative electrode sheet. Background technique [0002] The structure of an all-solid-state lithium-ion battery includes a positive electrode, an electrolyte, and a negative electrode, all of which are composed of solid materials. The solid electrolyte can greatly simplify the battery construction process while conducting lithium ions. Compared with traditional electrolyte lithium-ion batteries, all-solid-state lithium-ion batteries have the following advantages: ①Completely eliminates the potential safety hazards of electrolyte corrosion and ...

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Problems solved by technology

[0003] All-solid-state lithium-ion batteries provide a possibility for the use of metal lithium in the negative electrode. However, lithium dendrites will be generated during the cycle of metal Li, which will not only reduce the amount of lithium available for intercalation / extraction, but more seriously cause At the same time, metal Li is very active and easily reacts with oxygen and moisture in the air, and metal Li cannot withstand high temperatures, which brings difficulties to the assembly and application of batteries. Alloying lithium metal is an application of lithium A New Idea for Negative Pole

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