Negative electrode comprising solid electrolyte and low porosity and lithium battery applying the negative electrode

Abstract

The present invention provides a negative electrode comprising solid electrolyte and low porosity. The negative electrode comprises: an anode active material, a solid electrolyte, a conductive agent,and a binder, and a preparation method thereof comprises: dividing the anode active material and the solid electrolyte into at least three grades according to particle size; then carrying out mixing according to a certain ratio to achieve particle size distribution; mixing the material obtained by particle size distribution with the conductive agent, the binder and an organic solvent according toa certain ratio, stirring uniformly, smearing and drying; and pressing a dried pole piece at room temperature and suppressing the pole piece into a usable electrode. According to the invention, the solid electrolyte is added to the negative electrode pole piece, the solid electrolyte participates in the distribution of the anode material, the low-porosity electrode is prepared by cold pressing, and a lithium ion channel is provided for the low-porosity negative electrode, so the energy density of the lithium battery can be improved and the use amount of electrolyte is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a negative electrode containing a solid electrolyte and low porosity and a lithium battery using the negative electrode. Background technique [0002] With the rapid development of applications such as electric vehicles and new energy power generation, the development of advanced energy storage technologies has become an urgent need. Among many energy storage technologies, lithium-ion batteries are considered to be one of the most potential energy storage technologies. At present, lithium-ion batteries commonly used in the market use organic electrolyte materials as their electrolytes, which may cause problems such as leakage, flammability and explosion, which may cause safety hazards in the use of lithium-ion batteries. In recent years, with the rapid expansion of electric vehicles, battery safety has received unprecedented attention. To address safety iss...

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Problems solved by technology

[0005] Although the composite quasi-electrolyte in the above-mentioned patent has high conductivity, there is still the problem of interface stability between the electrolyte and the electrode, and in the current solid battery research, the treatment methods for the electrode mainly include the use of various sputtering, Deposition means to make thin film electrodes (Journal of electrochemical society.1996,143(10):3203-3213; Solid State Ionics.2000,135(3-4):41-42; Functional materials.2008,39(1): 91-94) or the method of coating electrode active materials with PEO-based polymer electrolytes (Advanced Energy Materials.2017, 1701437; Angew.Chem.Int.Ed.2016,55,1-5), but both It has its own shortcomings: the former has limited energy density, which limits the scope of use of thin-film batteries; the latter has low room temperature conductivity and poor electrochemical and chemical stability

Appropriately increasing the number of coarse-grained components can increase the packing density of the mixture and make it close to the most compact packing, but when the component is greater than 3, it is of little practical significance (Petroleum Drilling Technology. 2007.Vol.35No.4.46-49. )

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