Composite positive plate containing single-crystal high-nickel positive electrode material and all-solid-state battery

Abstract

The invention relates to the technical field of battery positive electrode materials, and discloses a composite positive electrode plate containing a single-crystal high-nickel positive electrode material and an all-solid-state battery, and a preparation method of the composite positive electrode plate comprises the following steps: preparing the single-crystal high-nickel positive electrode material through a secondary lithium-adding sintering method, carrying out surface acidification, coating Li2ZrO3 nano-particles, and carrying out sintering to obtain the composite positive electrode plate containing the single-crystal high-nickel positive electrode material. The positive electrode material is prepared by blending the positive electrode material with fluorine-containing lithium borate, lithium salt and a conductive agent and coating the mixture on a positive electrode current collector; the all-solid-state battery comprises the composite positive plate and a composite solid electrolyte. According to the secondary lithium-adding sintering method, grain growth and a crystal structure can be optimized, and the single-crystal high-nickel positive electrode material with good granularity and low cation mixed arrangement is obtained; the all-solid-state battery can effectively stabilize the interface property between the composite solid electrolyte and the composite positive plate, reduce the internal resistance, prolong the cycle life and improve the overall electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of battery positive electrode materials, and more particularly, the invention relates to a composite positive electrode sheet containing a single crystal high nickel positive electrode material and an all-solid-state battery. Background technique [0002] The energy density of commercial liquid lithium-ion batteries using graphite anodes is approaching the limit, and it is difficult to meet the increasing energy density requirements of portable electronic devices, electric vehicles and large energy storage devices. All-solid-state batteries are considered as one of the most promising solutions. . The cathode material of all-solid-state batteries determines the energy density of all-solid-state batteries. High-nickel cathode materials have been widely used in the preparation of all-solid-state batteries due to their high energy density and high capacity. However, with the increase of nickel content in high-n...

AI Technical Summary

Problems solved by technology

Its shortcoming is that it cannot solve the problem of high interface impedance between the positive electrode active material and the solid electrolyte. The high specific surface area of ​​the positive electrode active material and the inevitable side reactions between the interfaces will still hinder the electrochemical performance and affect the cycle life

At the same time, the binder is an electrochemically inert material, and its addition will reduce the proportion of the positive electrode active material, thereby reducing the energy density of the battery.