Porous three-element compound positive plate as well as preparation method and application thereof

Abstract

The invention discloses a porous three-element compound positive plate. The porous three-element compound positive plate is characterized by being prepared from the following materials of a three-element main material, a conducting agent, a binding agent, a fast ionic conductor, lithium salt and a pore forming agent. According to mass fraction of all the materials, the three-element main materialis 80 to 90 parts, the conducting agent is 1 to 5 parts, the binding agent is 2 to 5 parts, the fast ionic conductor is 2 to 15 parts, the lithium salt is 3 to 10 parts, and the pore forming agent is2 to 5 parts. The porous three-element compound positive plate has the advantages that in the porous three-element compound positive plate disclosed by the invention, solid electrolyte is poured intoa pole plate, so that electrode/electrolyte interface compatibility is improved, ion transmission capacity in the pole plate is enhanced, and whole electrochemical performance of a cell is improved. The porous three-element compound plate disclosed by the invention can be applied to the field of solid cells and has large-scale batch production possibility.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, a porous ternary composite positive electrode sheet, a preparation method of a porous ternary composite positive electrode sheet, and an application of a porous ternary composite positive electrode sheet. Background technique [0002] All-solid-state lithium-ion batteries use solid-state electrolytes to replace traditional organic liquid electrolytes, which are expected to fundamentally solve battery safety problems and are ideal chemical power sources for electric vehicles and large-scale energy storage. Stable solid-state electrolytes and high-energy electrode materials for all-solid-state lithium-ion batteries and improved electrode / solid-state electrolyte interface compatibility. [0003] Although there is basically no side reaction of solid electrolyte decomposition at the interface between the solid electrolyte and the electrode material, the solid characteristics make the electrode / ele...

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Problems solved by technology

[0003] Although there is basically no side reaction of solid-state electrolyte decomposition at the interface between the solid-state electrolyte and the electrode material, the solid properties make the electrode / electrolyte interface compatibility poor, and the high interface impedance seriously affects the ion transmission, which ultimately leads to the low cycle life of the solid-state battery. , Poor magnification performance

In addition, the energy density cannot meet the requirements of large batteries

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