Metal Composite Precursor for Lower-Temperature Li-Ion Cathode Calcination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The calcination temperature for mixing lithium compounds with metal composite compounds is challenging due to low reactivity, leading to high energy consumption and potential destruction of the crystal structure of the positive electrode active material in lithium secondary batteries.
Innovation Solution
A metal composite compound with specific particle size and strength ratios, calcined at 500° C. to 1,000° C. in an oxygen-containing atmosphere, enhancing reactivity with lithium compounds and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high calcination temperature is used to improve reactivity between lithium compound and metal composite compound, then the reaction completeness is improved, but the crystal structure of the positive electrode active material is destroyed and energy consumption increases
Solution Approach 1:
The invention changes the particle size parameters of the metal composite compound (controlling D50 and D90 within specific ranges) and the particle strength ratio (B/A ≥ 0.85) to optimize reactivity. This allows the reaction to proceed completely at lower calcination temperatures (500-800°C), preventing crystal structure destruction and reducing energy consumption while maintaining reaction completeness
Solution Approach 2:
The invention performs preliminary size reduction and strength optimization of the metal composite compound before the calcination reaction. By controlling particle size distribution and ensuring uniform particle strength, the material is pre-prepared to react efficiently at lower temperatures, avoiding the need for high temperature treatment that would destroy the crystal structure
2Productivity
If a high calcination temperature is used to ensure complete reaction, then the reaction efficiency is improved, but the energy consumption increases significantly
Solution Approach 1:
By optimizing particle size parameters (D50: 1-20 μm, D90: 3-50 μm) and particle strength ratio (B/A ≥ 0.85), the invention enhances the specific surface area and reactivity of the metal composite compound. This enables complete reactions at lower calcination temperatures (500-800°C), significantly reducing energy consumption while maintaining high reaction efficiency and productivity
3Reliability
If the particle size of metal composite compound is reduced to increase surface area and reactivity, then the reactivity with lithium compound is improved, but the particle strength decreases and handling becomes difficult
Solution Approach 1:
The invention optimizes particle size parameters (D50: 1-20 μm, D90: 3-50 μm) to achieve adequate surface area for high reactivity while controlling the particle strength ratio (B/A ≥ 0.85) to ensure particles remain mechanically robust. This balanced parameter optimization maintains both high reactivity with lithium compounds and sufficient particle strength for easy handling and processing
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 method produces a positive electrode active material with improved reactivity and structural integrity, optimizing battery performance while minimizing energy use.
Implementation Method 1
a step of calcining the obtained mixture at a temperature of 500° C. to 1,000° C. in an oxygen-containing atmosphere
Implementation Method 2
a 50% cumulative volume particle diameter (D50) and a 90% cumulative volume particle diameter (D90) of the aforementioned particles measured by a laser diffraction scattering method
Data Source
AI summary
The present invention pertains to a metal composite compound that contains a transition metal element and is used as a precursor of a positive electrode active material for a lithium ion secondary battery, the metal composite compound being in a form of particles, wherein when a 50% cumulative volume particle diameter (D50) and a 90% cumulative volume particle diameter (D90) of the particles measured by a laser diffraction scattering method are denoted as a (μm) and b (μm), respectively, a ratio of B (MPa), which is an average particle strength of particles having a particle diameter of b±1.0 (μm), with respect to A (MPa), which is an average particle strength of particles having a particle diameter of a±1.0 (μm), i.e., B/A, is 0.85 or more and 1 or less.