A graphene-based all-solid-state metal lithium battery and its working method

Abstract

The invention discloses a graphene-based all-solid metal lithium battery, which includes a positive electrode, a negative electrode, a solid electrolyte, a separator, and a battery case. The positive current collector of the battery uses LiFePO 4 ‑Graphene-based composites, the negative electrode current collector is made of lithium metal, the separator is made of polypropylene, and the solid electrolyte is made of V 2 S 5 ‑Graphene-based composite material, wherein the positive electrode and the solid electrolyte are coated with a layer of separator, and the negative electrode and the solid electrolyte are also coated with a layer of separator, arranged in parallel, stored in the battery case, and the battery is inserted into the bag The positive electrode, the negative electrode, the separator and the solid electrolyte are laminated, and there is a raised part on the substrate of the positive and negative electrodes connected with the lead wire to form a conductive ear; the graphene all-solid metal lithium battery of the present invention reduces the internal resistance of the battery and has superior The electronic conductivity, lithium ion conversion rate and the rechargeability of metallic lithium improve the stability of the solid / solid interface contact of the electrode; the energy density is high and the safety is strong, which is suitable for the power battery of new energy vehicles.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a graphene-based all-solid metal lithium battery and a working method thereof. Background technique [0002] With the rapid development of electric vehicles, the issue of power batteries has always been a hot spot. Solving the energy density and safety of power batteries is still the primary issue. The innovative technology of power batteries directly affects the leapfrog development of electric vehicles. Ordinary traditional power batteries have low energy density, large volume, poor safety, and high internal resistance, all of which are due to the low conductivity of the electrolyte and the low conductivity of the electrodes. [0003] Power battery is the core part of electric vehicles. Although all-solid-state lithium batteries have great technical advantages, they also have some of the above-mentioned problems. If these problems are not solved, all-solid-state lithium batteri...

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Problems solved by technology

[0004] The object of the present invention is to provide a graphene-based all-solid metal lithium battery with a structure, aiming to solve the problems of low ionic conductivity, poor solid / solid interface contact and stability, and safety of solid-state electrolyte materials in all-solid-state lithium batteries , by changing the positive electrode, electrolyte and structure to reduce the internal resistance of the battery, improve the electronic conductivity, lithium ion conversion rate and the rechargeability, reversibility, cycleability and long life of metal lithium, and at the same time improve the solid / solid state of the electrode and solid electrolyte Solid interface contact tightness and stability

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