A kind of all-solid-state lithium battery and preparation method thereof

Abstract

The invention discloses an all-solid-state lithium battery and a preparation method thereof. The all-solid-state lithium battery comprises a positive electrode, a negative electrode, a ceramic electrolyte layer, and a polymer solid electrolyte dispersed on the surfaces and spaces of the positive electrode, the negative electrode and the ceramic electrolyte layer; The positive electrode includes a positive electrode collector and a positive electrode layer attached to the surface of the positive electrode collector, the positive electrode layer includes a positive electrode active material, and the surface of the positive electrode active material is coated with a high-voltage ceramic electrolyte; the negative electrode includes a negative electrode collector and a surface-attached surface modification layer, The surface modification layer includes carbon material and a binder; the ceramic electrolyte layer includes a low-pressure ceramic electrolyte and a polymer binder; it can be layered independently or attached to the surface of the positive electrode; the polymer solid electrolyte includes a polymer phase, and a dispersion Lithium salt in the polymer phase. The all-solid-state lithium battery disclosed in the present invention has excellent safety performance, high energy density and excellent cycle stability.

Description

technical field [0001] The invention relates to the field of novel solid-state batteries, in particular to an all-solid-state lithium battery and a preparation method thereof. Background technique [0002] With the rapid development of the new energy vehicle industry, the requirements for the energy density of power batteries are getting higher and higher, but with the improvement of battery energy density, the safety of batteries is facing challenges, especially the metal lithium batteries that directly use metal lithium negative electrodes. [0003] Traditional lithium batteries generally use organic carbonate-based liquid electrolytes, which are flammable and easily cause safety problems. In addition, in the liquid metal lithium battery directly using the lithium negative electrode, the metal lithium is easy to form dendrites during the repeated charging and discharging process, and it is easy to pierce the separator, which leads to safety problems. Ceramic materials are...

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Problems solved by technology

[0005] Aiming at the problems in the prior art, the present invention discloses an all-solid-state lithium battery and a preparation method thereof. The all-solid-state lithium battery not only solves the problem that the liquid electrolyte reduces the safety of the battery, but also slows down the battery life due to the use of a lithium-free negative electrode. The potential safety hazards caused by the direct use of metal lithium anodes compensate to a certain extent the decrease in battery energy density caused by the use of high-density solid-state electrolytes

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