Mesoporous Cathode Material for Lithium-Ion Battery Capacity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing lithium-ion battery cathode materials have large pore diameters, leading to long lithium ion migration paths, resulting in low capacity, capacity attenuation, and increased internal resistance due to cracking during charge and discharge cycles.
Innovation Solution
A lithium-ion battery cathode material with a porous structure comprising mesopores of 2-20 nm, accounting for 90% of the total pore volume, which provides shorter migration paths for lithium ions and prevents cracking, thereby enhancing cycle performance and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pore diameter of cathode material is large, then the coatability and low-temperature performance are improved, but the lithium ion migration path becomes long, resulting in low capacity
Solution Approach 1:
The patent applies porous materials by controlling the pore size distribution to be predominantly in the 2-20 nm range (mesopores), which optimizes both ion transport and structural stability. The porous structure provides adequate pathways for lithium ion migration while maintaining short enough paths to ensure high capacity, resolving the contradiction between coatability and capacity.
2Ease of manufacture
If the pore diameter of cathode material is large, then the manufacturing ease is improved, but cracks are generated during repeated charge and discharge, deteriorating cycle life
Solution Approach 1:
The patent applies parameter changes by precisely controlling the pore size distribution parameters, setting the majority of pores (90% or more by volume) in the 2-20 nm range. This parameter optimization maintains material structural stability during charge-discharge cycles, preventing crack formation while preserving manufacturing feasibility.
3Quantity of substance
If the pore volume of mesopores is increased to 90% or more, then the capacity and cycle performance are improved, but the specific surface area increases, potentially leading to higher reactivity with electrolyte
Solution Approach 1:
The patent applies local quality by creating a specific pore size distribution where mesopores (2-20 nm) dominate the volume (90% or more), while controlling the overall specific surface area to remain within 0.25-1.5 m²/g. This localized optimization of pore characteristics ensures high capacity through adequate ion transport pathways while limiting excessive surface reactivity with the electrolyte.
Data Source
AI summary
The cathode material of the invention has a porous structure, wherein the pore volume of mesoporous with pore diameter of 2-20 nm accounts for 90% or more of the total pore volume. As compared with conventional lithium-ion battery cathode material, the lithium-ion battery cathode material of the present invention contains mainly mesopores, and the pore size of mesopores is mostly in the range of 2-20 nm.