Crystalline Metal Oxide Coating on Lithium Battery Cathode
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Solution Overview
Problem
Current lithium batteries using transition metal compounds as cathode active materials have limited electrical capacity, low electrical conductivity, and reduced lifetime and high-rate characteristics due to the use of non-conductive materials.
Innovation Solution
A composite cathode active material is developed with a core capable of intercalating and deintercalating lithium, coated with a crystalline metal oxide layer, which improves electrical conductivity and enhances the battery's surface conductivity, lifetime, and high-rate characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If transition metal compounds are used as cathode active materials, then electrical capacity is improved, but electrical conductivity deteriorates
Solution Approach 1:
The patent applies composite materials by combining transition metal compounds (for high capacity) with conductive materials such as carbon coatings or metallic oxides (for improved conductivity). This creates a composite cathode structure where the conductive material forms a coating or matrix around the transition metal particles, simultaneously achieving high electrical capacity and adequate electrical conductivity.
2Quantity of substance
If non-conductive materials are used to increase capacity, then electrical capacity is improved, but lifetime and high-rate characteristics deteriorate
Solution Approach 1:
The patent uses conductive materials as an intermediary between the non-conductive transition metal compounds and the electrolyte/external circuit. This intermediary conductive layer facilitates electron transport while allowing the high-capacity transition metal material to function, thereby improving both lifetime and high-rate characteristics without sacrificing capacity.
3Ease of manufacture
If conventional cathode materials are used, then manufacturing simplicity is maintained, but high-rate characteristics deteriorate
Solution Approach 1:
The patent modifies physical parameters of the cathode material by applying surface coatings or altering particle morphology (such as reducing particle size or creating porous structures). These parameter changes enhance the surface area and conductivity, improving high-rate characteristics while maintaining compatibility with conventional manufacturing processes.
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 cathode active material with a crystalline coating layer significantly improves the electrical conductivity and charging/discharging characteristics of lithium batteries, leading to enhanced lifetime and high-rate performance.
Implementation Method 1
a core capable of intercalating and deintercalating lithium
Data Source
AI summary
A composite cathode active material, a cathode including the same, a lithium battery including the cathode, and preparation method thereof are disclosed. The composite cathode active material includes: a core capable of intercalating and deintercalating lithium; and a crystalline coating layer disposed on at least part of a surface of the core, wherein the coating layer include a metal oxide.