Positive Electrode Active Material Particles for Lithium Secondary Battery
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Solution Overview
Problem
Lithium secondary batteries face challenges in achieving smooth lithium ion migration and improved battery characteristics as they expand into larger applications, requiring enhanced electrical conductivity and ion mobility.
Innovation Solution
The development of positive electrode active material particles with specific magnetic susceptibility ranges, particle diameter distributions, and compositions, including Li, Ni, and other elements like Cu, Ti, and Al, to facilitate efficient lithium ion migration and improved battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If lithium secondary batteries are expanded into larger applications, then power output and energy storage capacity are improved, but lithium ion migration smoothness and electrical conductivity deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the volume magnetic susceptibility mode to be 0.004 or more and less than 0.012, and the average value to be 0.001 or more and 0.3 or less. This magnetic susceptibility parameter control optimizes the electrical conductivity and lithium ion migration properties of the positive electrode active material, resolving the contradiction between power output and ion migration smoothness in large-scale battery applications.
Solution Approach 2:
The patent uses composite materials by employing lithium metal composite oxides with specific magnetic susceptibility characteristics as the positive electrode active material. The composite oxide structure enables simultaneous achievement of high power output and smooth lithium ion migration, as the specific magnetic properties correlate with enhanced electrical conductivity and ion transport properties in the composite material system.
2Quantity of substance
If lithium metal composite oxides are used as positive electrode active materials, then battery energy storage capacity is improved, but electrical conductivity is insufficient
Solution Approach 1:
The patent resolves the electrical conductivity issue by changing the magnetic susceptibility parameters of the lithium metal composite oxide. By controlling the mode to be 0.004 or more and less than 0.012, and the average value to be 0.001 or more and 0.3 or less, the material achieves optimized electrical conductivity while maintaining high energy storage capacity, as these magnetic parameters serve as indicators for optimal electronic structure and charge transport.
3Reliability
If attempts are made to improve battery characteristics, then performance is enhanced, but material composition complexity increases
Solution Approach 1:
The patent simplifies material composition complexity by using parameter changes as the primary optimization approach. Instead of complicating the material composition, the invention focuses on controlling the volume magnetic susceptibility parameters (mode and average value) of the lithium metal composite oxide, which provides a straightforward method to enhance battery characteristics without increasing compositional complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These particles enable enhanced initial charge and discharge capacities, improving the overall battery characteristics by ensuring smooth lithium ion migration and increased conductivity.
Implementation Method 1
when a volume magnetic susceptibility of one whole particle of the positive electrode active material particles for a lithium secondary battery is obtained in each of a plurality of the particles, a mode of individual volume magnetic susceptibilities in a range of 0.004 or more and 0.04 or less is 0.004 or more and less than 0.012
Data Source
AI summary
Positive electrode active material articles for a lithium secondary containing at least Li and Ni,wherein, when a volume magnetic susceptibility of one whole particle of the positive electrode active material particles for a lithium secondary battery is obtained in each of a plurality of the particles, a mode of individual volume magnetic susceptibilities in a range of 0.004 or more and 0.04 or less is 0.004 or lore and less than 0.012.