Positive electrode active material composite particle and powder

Abstract

Provided are a positive electrode active material composite particle and powder that can be suitably used in the production of a lithium ion secondary battery having low internal resistance and excellent charge / discharge characteristics. The positive electrode active material composite particle according to the present disclosure includes a base particle constituted by a positive electrode active material containing a lithium composite oxide having a layered crystal structure, and a coating layer that is constituted by a material containing a multiple oxide different from the positive electrode active material, a lithium compound, and an oxoacid compound, and that at least partially coats a surface of the base particle. The oxoacid compound preferably contains at least one of a nitrate ion and a sulfate ion as an oxoanion.

Description

technical field [0001] The invention relates to a positive electrode active material composite particle and powder. Background technique [0002] Lithium-ion secondary batteries are gaining importance as high-energy power sources in a wide range of industries. In particular, all-solid-state batteries, in which the electrolyte is replaced with a solid electrolyte, are attracting attention as a technology that realizes safety and high-speed charge and discharge. [0003] Due to the characteristics of materials and structures, the internal resistance of all-solid-state batteries is easy to increase, and most of them cannot be fully operated at temperatures around room temperature, for example, above 10°C and below 35°C. Charging characteristics comparable to those of conventional lithium-ion secondary batteries are required, and a rapid decrease in charge-discharge capacity due to internal resistance during operation at a temperature around room temperature has become a problem...

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Problems solved by technology

[0011] However, in the structure described in Patent Document 1, countless pores are likely to be generated in the solid electrolyte, and point contacts are likely to be formed at the interface, so that a shortage of lithium ions near the interface is likely to occur, and sufficient full-scale electrolyte is realized at a temperature around room temperature. The technology of solid-state batteries is not enough

[0012] In addition, in the structure described in Patent Document 2, an ion conductor is mixed with a medium having a different concentration of lithium ions, and a capacitive resistance is formed at the interface between the two during charge and discharge. Therefore, the net internal resistance of the positive electrode composite material increases instead The problem

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