Metal Composite Compound Crystal-State Control for Li Battery Efficiency
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Solution Overview
Problem
Current methods for producing lithium secondary batteries face challenges in controlling the crystal state of metal composite compounds, which affects battery performance, leading to a demand for improved control over the crystal state to enhance battery efficiency.
Innovation Solution
A metal composite compound with specific crystallite size distribution characteristics, produced through a method involving the mixing and calcining of a lithium compound with a metal composite compound in an oxygen-containing atmosphere, is developed to achieve high initial efficiency in lithium secondary batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mixing and calcining methods are used to produce lithium secondary batteries, then production process simplicity is maintained, but control over crystal state of metal composite compound is insufficient, resulting in suboptimal battery performance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the crystallite size distribution parameters (relative standard deviation ≥0.50, mode 50-200 Å, average 100-300 Å) of the metal composite compound through controlled calcination processes. This enables optimization of lithium ion conductivity and battery performance while maintaining manufacturing feasibility
2Productivity
If crystallite size distribution is not controlled, then production process is simple, but initial efficiency of lithium secondary battery is reduced
Solution Approach 1:
The patent implements parameter changes by establishing specific crystallite size distribution parameters (relative standard deviation of 0.50 or more, mode of 50 Å or more, average of 120 Å or more) through controlled calcination. These parameter specifications directly improve initial efficiency while providing clear manufacturing guidance
Solution Approach 2:
The patent replaces complex mechanical control methods with thermal field control (calcination temperature and atmosphere control) to achieve precise crystallite size distribution. This substitution simplifies the manufacturing process while maintaining high initial efficiency
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 developed metal composite compound enables the production of lithium secondary batteries with high initial efficiency by optimizing the crystal state of the positive electrode active material, leading to improved lithium ion conductivity and battery performance.
Implementation Method 1
in a powder X-ray diffraction measurement using CuKα rays, a relative standard deviation of a volume-based crystallite size distribution calculated from a diffraction peak
Implementation Method 2
a calcining step of calcining an obtained mixture in an oxygen-containing atmosphere at a temperature of 500° C. or higher and 1000° C. or lower
Data Source
AI summary
A metal composite compound, in which, in a powder X-ray diffraction measurement using CuKα rays, a relative standard deviation of a volume-based crystallite size distribution calculated from a diffraction peak in a range of 2θ=19±1° is 0.50 or more.