Lithium Ion Battery Positive Electrode Material
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Solution Overview
Problem
Current lithium ion battery positive electrode active materials do not adequately meet the requirements for high capacity and rate characteristics, especially in large-sized battery applications.
Innovation Solution
A positive electrode active material with a layer structure represented by the compositional formula Liα(NiβM1-β)Oγ, where α is between 0.9 and 1.2, β is between 0.70 and 0.79, and γ is 1.9 or more, with specific lattice constant and compositional ratio coordinates within defined regions on a graph, optimizing the ratio of lithium to other metals for improved battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional lithium-containing transition metal oxides are used as positive electrode active material, then basic battery function is achieved, but high capacity and rate characteristics are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional ratios (α, β, γ) and lattice constants (a, c) of the lithium-containing transition metal oxide. By optimizing these parameters within specific ranges, the material achieves both high capacity and excellent rate characteristics, resolving the contradiction between quantity of substance and reliability.
Solution Approach 2:
The patent uses composite materials by combining multiple transition metals (Ni, Co, Mn, Al) in specific ratios within the lithium-containing oxide structure. This composite approach leverages the advantages of each metal to achieve high capacity while maintaining good rate characteristics and cycle stability.
2Reliability
If metal oxide complexation is performed to improve battery characteristics, then cycle characteristics and safety are enhanced, but high capacity and rate characteristics remain insufficient
Solution Approach 1:
The patent optimizes the compositional parameters (α, β, γ) and lattice constants to achieve a balance between cycle characteristics and capacity. The specific parameter ranges ensure structural stability for good cycle life while maintaining high lithium content for high capacity.
Solution Approach 2:
The patent applies local quality by creating a heterogeneous metal distribution within the oxide structure, where different metals occupy specific sites to provide both structural stability (for cycle characteristics) and high lithium content (for capacity).
Data Source
Figure 1
AI summary
The present invention provides a positive electrode active material for lithium ion battery which has a high capacity and good rate characteristics can be provided. The positive electrode active material for lithium ion battery has a layer structure represented by the compositional formula: Lix(NiyM1-y)OZ (wherein M represents at least one type selected from the group consisting of Mn, Co, Al, Mg, Cr, Ti, Fe, Nb, Cu and Zr, x denotes a number from 0.9 to 1.2, y denotes a number from 0.70 to 0.79, and z denotes a number of 1.9 or more), wherein the coordinates of the lattice constant a and compositional ratio (Li/M) are within the region enclosed by three lines given by the equations: y = 1.108, y = -37.298x + 108.27, and y = 75.833x - 217.1 on a graph in which the x-axis represents a lattice constant a and the y-axis represents a compositional ratio (Li/M) of Li to M, and the lattice constant c is 14.2 to 14.25.