Lithium Nickel Composite Oxide Positive Electrode Active Material
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Solution Overview
Problem
Lithium-nickel composite oxides with excess oxygen in lithium ion batteries do not achieve optimal performance as high-quality positive electrode active materials, requiring improvements in battery properties such as capacity, rate performance, and cycle characteristics.
Innovation Solution
A positive electrode active material with a composition of LixNi1−yMyO2+α, where M includes Co and other elements, and an average particle size of 5 μm to 15 μm, with excess oxygen (α > 0.05), optimized to enhance battery properties by controlling particle size distribution and oxygen content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium-nickel composite oxide with excess oxygen is used, then oxygen content increases, but battery property remains insufficient
Solution Approach 1:
The patent changes the oxygen content parameter from conventional levels to excess oxygen (α > 0.05 in formula LixNi1−yMyO2+α), and simultaneously optimizes particle size parameters (D50: 5-15 μm, D90: 20 μm or less) to achieve improved battery properties including capacity, rate performance, and cycle characteristics
Solution Approach 2:
The patent uses a composite material system combining lithium-nickel composite oxide with multiple dopant elements (M = Co and at least one of Sc, Ti, V, Cr, Mn, Fe, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B, or Zr) to achieve synergistic effects that improve battery performance while maintaining structural stability
2Productivity
If particle size is reduced to improve rate performance, then capacity may decrease, but if particle size is increased to improve capacity, then rate performance deteriorates
Solution Approach 1:
The patent optimizes particle size parameters within specific ranges (D50: 5-15 μm, D90: 20 μm or less) to achieve a balance between rate performance and capacity, preventing both excessive particle size reduction and enlargement
Data Source
AI summary
The present invention provides a positive electrode active material for lithium ion batteries having excellent battery property.The positive electrode active material for lithium ion batteries is represented by composition formula: LixNi1−yMyO2+α, whereinM is Co as an essential component and at least one species selected from a group consisting of Sc, Ti, V, Cr, Mn, Fe, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B and Zr, 0.9≤x≤1.2, 0<y≤0.7, α>0.05, andan average particle size (D50) is 5 μm to 15 μm.