Lithium Metal Composite Oxide Pore Control for Stable Electrode Slurry
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Solution Overview
Problem
The viscosity of the positive electrode mixture in lithium secondary batteries is prone to change due to the varying state of lithium metal composite oxide particles, affecting the coating properties and consistency of the manufacturing process.
Innovation Solution
A lithium metal composite oxide with specific pore size distribution, particle size, and compositional control, including Li and Ni, is formulated to maintain low initial viscosity and stability during continuous coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the particle state of lithium metal composite oxide is not controlled, then the initial viscosity of positive electrode mixture is high during adjustment, but controlling particle state increases manufacturing complexity
Solution Approach 1:
The invention controls specific parameters of the lithium metal composite oxide particles (pore volume in 2-10 nm range, average particle diameter, specific surface area) to achieve low initial viscosity of the positive electrode mixture during adjustment, resolving the contradiction between ease of operation and manufacturing complexity by establishing precise parameter specifications
Solution Approach 2:
The invention performs preliminary control of particle state parameters before the coating process to ensure low initial viscosity during adjustment, preventing viscosity problems before they occur during manufacturing rather than addressing them during the coating process
2Manufacturing precision
If the particle state of lithium metal composite oxide changes during continuous coating, then coating consistency deteriorates, but maintaining constant particle state increases process complexity
Solution Approach 1:
The invention specifies precise parameter ranges for the lithium metal composite oxide (pore volume >0.4×10^-3 cm³/g in 2-10 nm range, particle diameter 3-20 μm, specific surface area 0.5-2.0 m²/g) that maintain stability during continuous coating, achieving coating consistency through controlled parameter selection
Solution Approach 2:
The invention uses a simple mixing process to prepare the positive electrode mixture with controlled particle state, avoiding complex real-time viscosity control systems during continuous coating by establishing stable particle properties beforehand
3Ease of operation
If high pore volume in 2-10 nm range is achieved, then initial viscosity is reduced, but particle stability during storage may deteriorate
Solution Approach 1:
The invention optimizes the pore volume parameter in the 2-10 nm range to be greater than 0.4×10^-3 cm³/g while simultaneously controlling other parameters (particle diameter, specific surface area, composition ratios) to maintain both low initial viscosity and particle stability during storage and processing
Solution Approach 2:
The invention uses a composite lithium metal oxide containing multiple elements (Li, Ni, and other metals) with controlled pore structure and composition ratios, where the composite structure provides both the desired pore volume for low viscosity and structural stability for particle integrity
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 ensures a positive electrode mixture with stable viscosity, improving coating consistency and quality in lithium secondary batteries.
Implementation Method 1
a pore volume in a range where a pore size is 2 nm or more and 10 nm or less is more than 0.4 × 10^-3 cm³/g, in a pore size distribution of an adsorption isotherm which is obtained by measuring an adsorption isotherm and a desorption isotherm with a nitrogen gas according to a Barrett-Joyner-Halenda method
Data Source
Figure 1~2
AI summary
A lithium metal composite oxide contains at least Li and Ni, in which (1) and (2) are satisfied, (1) in a pore size distribution of an adsorption isotherm which is obtained by measuring an adsorption isotherm and a desorption isotherm with a nitrogen gas according to a Barrett-Joyner-Halenda method, a pore volume in a range where a pore size is 2 nm to 10 nm is more than 0.4 × 10-3 cm3/g and 1.0 × 10-3 cm3/g, (2) A/D50 is 0.9 × 10-3 to 3.4 × 10-3.