Novel graphene-based total-soil metal lithium battery and working method thereof

Abstract

The invention discloses a novel graphene-based total-soil metal lithium battery. The novel graphene-based total-soil metal lithium battery comprises a positive electrode, a negative electrode, solid electrolyte, a diaphragm and a battery shell. In the battery, a positive current collector adopts a LiFePO4-graphene based compound; a negative current collector adopts metal lithium; the diaphragm adopts polypropylene; the solid electrolyte adopts a V2S5-graphene based composite material; the middle of the positive electrode and the solid electrolyte is coated with one layer of the diaphragm; themiddle of the negative electrode and the solid electrolyte is coated with one layer of the diaphragm; the diaphragms are arranged in parallel and are accommodated in the battery shell; the battery isformed by stacking the positive electrode, the negative electrode, the diaphragms and the solid electrolyte in an inserting bag mode; and convex parts on substrates of the positive electrode and the negative electrode are connected with leads to form conductive lugs. The graphene total-soil metal lithium battery reduces the internal resistance of the battery, has excellent electronic conductivity,lithium ion conversation rate and metal lithium rechargeability, improves electrode solid / solid interface contact stability, has high energy density and high safety, and is suitable for a power battery of a new energy automobile.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a novel 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 b...

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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 new structure, aiming to solve the problem of low ionic conductivity, poor solid / solid interface contact and stability, and safety of solid-state electrolyte materials in all-solid-state lithium batteries. The problem is to reduce the internal resistance of the battery by changing the positive electrode, electrolyte and structure, 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 state of the electrode and solid electrolyte. / Solid interface contact tightness and stability

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