Positive electrode active substance for secondary battery and secondary battery

JPWO2025069846A1Pending Publication Date: 2025-04-03
0 Cites 0 Cited by

Patent Information

Application Number
JP2025548617
Authority / Receiving Office
JP · JP
Patent Type
Applications
Priority Date
2023-09-29
Filing Date
2024-08-26
Publication Date
2025-04-03

AI Technical Summary

Technical Problem

The prior art still has shortcomings in improving the energy density of the positive electrode living substance of lithium-ion secondary batteries, especially when the effect is not obvious enough when controlling components to increase capacity.

Method used

Lithium metal composite oxides with rock salt structure are used, specifically, lithium, a composite oxide of the first positive element M1 (where Mn accounts for more than 50% of M1) and the second positive element M2, wherein the content of M2 is between 10 ppm and 1000 ppm, the grain size is between 1 nm and 1000 nm, and the half width of the (200) plane is determined by X-ray diffraction to be between 0.1° and 2.5°.

Benefits of technology

A lithium-ion secondary battery with high energy density is realized. By optimizing the crystal structure and composition of the positive electrode living, the initial discharge capacity and average discharge potential of the battery are significantly improved.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

Provided is a positive electrode active substance for a secondary battery, which contains a lithium metal composite oxide having a crystal structure that can belong to the space group Fm-3m. The lithium metal composite oxide contains Li, a first positive element M1 and a second positive element M2. 50 atom% or more of the first positive element M1 is Mn. The content of the second positive element in the lithium metal composite oxide is 10-1000 ppm on a mass basis. The crystallite size of the lithium metal composite oxide falls within the range 1 nm to 120 nm or the half value width of a diffraction peak attributable to the (200) face falls within the range 0.1° to 2.5° on a 2θ basis in an X-Ray diffraction profile of the lithium metal composite oxide determined using CuKα rays.
Need to check novelty before this filing date? Find Prior Art