Composite Cathode Material for Lithium Battery Structural Stability
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Solution Overview
Problem
Lithium batteries face challenges in maintaining structural stability and efficiency during charging and discharging, particularly at high voltages, leading to decreased capacity and lifespan due to phase transitions in layered metal oxide materials.
Innovation Solution
A composite positive active material is developed, combining a first metal oxide with a layered crystal structure and a second metal oxide with a rocksalt crystal structure, doped with elements from Group 1 and Group 2 of the Periodic Table, to enhance structural stability and lithium ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a layered metal oxide material is used as positive active material, then high discharge capacity can be achieved, but structural stability deteriorates during charging and discharging due to phase transitions
Solution Approach 1:
The patent applies composite materials by combining layered metal oxide (providing high discharge capacity) with spinel metal oxide (providing structural stability). This composite structure allows the material to maintain both high productivity and compositional stability during charging and discharging cycles, resolving the contradiction between achieving high discharge capacity and maintaining structural integrity.
2Stability of the object's composition
If doping elements from Group 1 and Group 2 are introduced, then structural stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by systematically varying the doping elements (selecting from Group 1 and Group 2 elements), doping concentrations, and heat treatment parameters to achieve optimal structural stability. This controlled modification of parameters allows improvement in compositional stability while managing manufacturing complexity through methodical parameter optimization rather than complex structural modifications.
Data Source
AI summary
A composite positive active material includes a composite, the composite including: a first metal oxide having a layered crystal structure; and a second metal oxide having a rocksalt crystal structure, wherein the composite includes at least one doping element selected from Group 1 and Group 2 of the Periodic Table wherein the doping element is not Li.