Li-Coated O2 Active Material for High-Capacity Low-Resistance Batteries
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Solution Overview
Problem
The electrode active material with an O2-type structure has limitations in terms of capacity and resistance.
Innovation Solution
A composite active material is developed, comprising an active material particle with an O2-type structure and a coat layer made of an oxide containing Li, which covers at least a part of the particle's surface, with a controlled particle diameter of less than 5.90 μm, enhancing Li diffusion and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the particle diameter is reduced to improve Li diffusion and conductivity, then resistance decreases, but manufacturing precision and particle size control become more difficult
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle diameter within a specific range (less than 5.90 μm, preferably 4.00 μm or less) to optimize the balance between Li diffusion efficiency and manufacturing feasibility. This parameter optimization resolves the contradiction by identifying a critical size threshold that achieves low resistance while remaining manufacturable
Solution Approach 2:
The patent creates a composite active material consisting of O2-type structured particles with controlled size and composition, combining multiple transition metal elements (Mn, Ni, Co) in specific ratios. This composite approach enables simultaneous achievement of low resistance through optimized Li diffusion paths and controllable particle size through compositional tuning
2Quantity of substance
If the particle diameter is reduced to shorten diffusion distance, then capacity increases, but particle size control and manufacturing precision worsen
Solution Approach 1:
The patent utilizes parameter changes by establishing a critical particle diameter threshold (less than 5.90 μm) that maximizes capacity through shortened Li diffusion paths while maintaining manufacturability. The specific size parameter is optimized to achieve high capacity without sacrificing production control
Solution Approach 2:
The patent applies partial action by reducing particle size to a specific extent (below 5.90 μm) rather than minimizing it completely. This partial reduction achieves sufficient capacity improvement while avoiding the manufacturing precision issues that would arise from excessive size reduction
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
The composite active material achieves high capacity and low resistance, with improved Li-ion conduction paths and reduced diffusion distances.
Implementation Method 1
enhancing Li diffusion and conductivity
Implementation Method 2
reduced diffusion distances
Data Source
AI summary
A composite active material in the present disclosure includes an active material particle and a coat layer. The active material particle has an O2-type structure. The active material particle contains Li, at least one transition metal element of Mn, Ni, and Co, and O, as constituent elements. The coat layer covers at least a part of a surface of the active material particle. The coat layer is a layer of an oxide that contains Li as a constituent element. A particle diameter (D50) of the composite active material is less than 5.90 μm.