Lithium Nickel Composite Oxide Cathode Material
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Solution Overview
Problem
Current lithium ion battery positive electrode active materials, such as lithium nickel composite oxides, require improvements in characteristics like capacity, cycle stability, and internal resistance for large-scale applications, particularly due to excess oxygen amounts and suboptimal particle sizes.
Innovation Solution
A positive electrode active material with the composition Li(Li x Ni 1-x-y M y )O 2+α, where M represents Mn and Co, with specific peak strength ratios and diffraction angles, and an excess oxygen amount, is developed to enhance battery characteristics by optimizing oxygen content and particle size distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium nickel composite oxide with excess oxygen amount is used, then battery capacity is improved, but manufacturing precision deteriorates
Solution Approach 1:
The invention changes the oxygen content parameter from stoichiometric (O2) to excess oxygen (O2+α) where α > 0.1, fundamentally altering the chemical composition to achieve higher battery capacity while maintaining structural stability through the specific oxygen excess range
Solution Approach 2:
The invention uses composite materials by combining lithium nickel composite oxide with specific metal elements (Mn, Co, Ni) in controlled ratios, creating a multi-element composite structure that achieves both high capacity and manufacturing feasibility through synergistic effects of different metal oxides
2Reliability
If particle size is reduced to improve rate characteristics, then electron conductivity is improved, but manufacturing complexity increases
Solution Approach 1:
The invention changes the particle size parameter from conventional larger sizes to a specific range (3-15 μm average diameter with 0.3-2.0 μm primary particles), optimizing electron conductivity and rate characteristics while maintaining manufacturing feasibility through controlled particle size distribution
Solution Approach 2:
The invention segments the particle structure into distinct hierarchical levels: primary particles (0.3-2.0 μm) that provide high surface area and electron conductivity, and secondary aggregate particles (3-15 μm) that provide mechanical stability and manageable handling, thereby improving rate characteristics without excessive manufacturing complexity
Data Source
AI summary
The present invention provides a positive electrode active material for a lithium ion battery with excellent battery characteristics can be provided. The positive electrode active material for a lithium ion battery is represented by the following composition formula: Li(LixNi1-x-yMy)O2+α (in the formula, M represents at least one selected from Sc, Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B, and Zr, 0 ≤ x ≤ 0.1, 0 < y ≤ 0.7, and α > 0).