Composite Cathode Active Material for Lithium Battery
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Solution Overview
Problem
Lithium batteries face challenges in maintaining voltage stability and efficiency during repeated charging and discharging due to structural instability of cathode active materials, leading to decreased capacity and lifetime performance.
Innovation Solution
A composite cathode active material is developed, combining a first metal oxide with a layered crystal structure and a second metal oxide with a perovskite crystal structure, where the second metal oxide enhances structural stability and electron conductivity, improving charging/discharging efficiency and lifetime characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional cathode active material is used, then the battery can be manufactured with standard capacity, but the voltage characteristics decrease and structural stability deteriorates after repeated charging and discharging
Solution Approach 1:
The patent applies composite materials by combining layered crystal structure metal oxide and perovskite crystal structure metal oxide in a composite cathode active material. The layered structure provides stable lithium ion insertion/extraction pathways while the perovskite structure enhances structural stability during charging/discharging cycles, resolving the contradiction between maintaining reliability and extending duration of action.
2Ease of manufacture
If the cathode active material structure is simplified, then manufacturing is easier, but voltage characteristics and capacity characteristics deteriorate after repeated charging and discharging
Solution Approach 1:
The composite cathode active material combines two metal oxides with different crystal structures that can be synthesized through conventional solid-state reaction methods. This approach maintains ease of manufacture while achieving improved voltage characteristics and capacity characteristics through the synergistic effect of the layered and perovskite structures.
3Quantity of substance
If high capacity cathode material is used, then battery capacity increases, but structural instability increases leading to decreased lifetime performance
Solution Approach 1:
The patent uses a composite of layered crystal structure metal oxide (providing high capacity through efficient lithium ion transport) and perovskite crystal structure metal oxide (providing structural stability). This composite structure maintains high capacity while preventing structural degradation during repeated charging and discharging cycles.
Solution Approach 2:
The layered crystal structure regions provide pathways for lithium ion insertion and extraction to enable high capacity, while the perovskite crystal structure regions provide structural stability to maintain composition integrity. Each phase performs its specialized function locally within the composite material.
Data Source
AI summary
A composite cathode active material including: a first metal oxide having a layered crystal structure; and a second metal oxide having a perovskite crystal structure, wherein the second metal oxide includes a first metal and a second metal that are each 12-fold cubooctahedrally coordinated to oxygen. Also a cathode including the composite cathode material and a lithium battery containing the cathode.