Lithium Sulfate Composite Positive Active Material for Thermal Stability
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Solution Overview
Problem
Lithium batteries face challenges in achieving high capacity and thermal stability, which affect their charge and discharge efficiency and lifetime performance.
Innovation Solution
A positive active material is developed, comprising lithium sulfate and a core of primary particles made from compounds including nickel, lithium, and a first element such as cobalt or manganese, with specific heat treatment processes to optimize the inclusion of lithium sulfate within the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional positive active materials are used to achieve high capacity, then the battery capacity increases, but thermal stability deteriorates
Solution Approach 1:
The patent applies composite materials by combining lithium sulfate particles with a core material containing nickel, lithium, and other elements in specific ratios. This composite structure enables the material to achieve high capacity characteristics while maintaining thermal stability, as the lithium sulfate component provides thermal stability while the core material delivers high capacity performance.
2Quantity of substance
If high capacity positive active materials are used, then charge and discharge efficiency improves, but lifetime performance deteriorates
Solution Approach 1:
The composite structure of lithium sulfate and core material with controlled composition ratios creates a synergistic effect that simultaneously improves charge-discharge efficiency and extends battery lifetime. The specific elemental composition in the core material enhances electrochemical activity for better efficiency, while the overall composite structure ensures long-term stability for extended lifetime.
3Stability of the object's composition
If lithium sulfate content is increased to improve thermal stability, then thermal stability improves, but high capacity characteristics deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the content of lithium sulfate and the composition ratios of nickel, lithium, and other elements in the core material. By optimizing these parameters within specific ranges, the invention achieves a balance where thermal stability is improved through lithium sulfate while high capacity characteristics are maintained through the optimized core material composition.
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 solution enhances the high capacity characteristics and thermal stability of the positive active material, leading to improved charge and discharge efficiency and extended lifetime of lithium batteries.
Implementation Method 1
A positive active material is developed, comprising lithium sulfate and a core of primary particles made from compounds including nickel, lithium, and a first element such as cobalt or manganese, with specific heat treatment processes to optimize the inclusion of lithium sulfate within the material
Data Source
AI summary
A positive active material, a method of preparing the same, and a lithium battery including the same.