All-solid-state battery and preparation method thereof

Abstract

The invention relates to an all-solid-state battery and a preparation method thereof. The all-solid-state battery comprises a positive electrode, an organic-inorganic composite electrolyte, a multifunctional intermediate layer and a negative electrode which are sequentially stacked, the preparation raw materials of the multifunctional middle layer comprise a high-molecular polymer, an ionic liquid monomer, an initiator and a solvent; the ionic liquid monomer comprises at least one unsaturated carbon-carbon double bond; and the cation of the ionic liquid monomer is selected from one or a combination of more of piperidine cation, quaternary ammonium salt cation and pyrrole cation. The all-solid-state battery is of an integrated structure, the problem that lithium intercalation and deintercalation reactions are difficult to complete due to the use of ionic liquid is solved, and the long-acting cycle stability of the all-solid-state battery is ensured.

Description

technical field

[0001] The invention relates to the technical field of batteries, in particular to an all-solid-state battery and a preparation method thereof. Background technique

[0002] At present, solid-state batteries that use solid electrolytes instead of liquid electrolytes are one of the effective ways to solve the safety of lithium-ion batteries and improve energy density. Unlike liquid electrolytes, which have good deformation and contact capabilities, it is difficult for solid-state batteries to maintain effective contact with the electrodes, especially during battery cycling, where the surface morphology on the electrodes will continue to change, such as expansion, contraction, and lithium dendrites. These problems will aggravate the failure of lithium solid-state batteries. In order to improve the solid-solid interface contact, the electrolyte layer prepared by the electrolyte layer and the buffer layer or the modified layer is the most widely used and effecti...

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