Active material and method for producing the same, electrode mixture, and battery

By placing a cover portion containing A element on the surface of the positive electrode active material core of the lithium-ion battery, the problem of the increase in the interface resistance between the positive electrode active material and the solid electrolyte is solved, and the battery characteristics are improved.

CN115884943BActive Publication Date: 2025-03-25MITSUI MINING & SMELTING CO LTD
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Patent Information

Application Number
CN202180050633.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2020-09-11
Filing Date
2021-09-03
Publication Date
2025-03-25
Estimated Expiration
2041-09-03

AI Technical Summary

Technical Problem

In lithium-ion batteries, the interface resistance between the positive electrode active substance and the solid electrolyte increases, resulting in a decrease in battery characteristics.

Method used

By placing the cover part on the core surface of the active substance, the cover part contains elements A (such as titanium, zirconium, tantalum, niobium and aluminum), and the average intensity distribution map of the constituent elements of the cover part is measured by an energy dispersion type X-ray analysis device, the first derivative of the peak of element A is obtained so that it has more than two inflection points.

Benefits of technology

It effectively suppresses the generation of high resistance layers, reduces the interface resistance of the battery, and improves the rate characteristics of the battery and other battery characteristics.

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Abstract

The active material of the present invention has a core portion formed of an active material matrix and a covering portion located on the surface of the core portion. The covering portion contains an A element (A is at least one of titanium (Ti), zirconium (Zr), tantalum (Ta), niobium (Nb) and aluminum (Al)). In the average intensity distribution diagram of the constituent elements at the covering portion measured using an energy dispersive X-ray analyzer, when the first-order derivative of the peak caused by the A element is obtained, the first-order derivative has two or more inflection points.
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