Lithium Titanate Electrode Pore Structure for Battery Energy Density
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Solution Overview
Problem
Existing lithium rechargeable battery electrodes have a reduced utilization factor of active material, leading to insufficient energy density and capacity, as they achieve only 80% or less filling factor, resulting in suboptimal battery performance.
Innovation Solution
The use of a lithium titanate sintered body with a mean fine pore diameter of 0.10 to 0.20 µm, specific surface area of 1.0 to 3.0 m²/g, and relative density of 80 to 90% as the positive or negative electrode, allowing for improved active material filling and electrolyte impregnation, enhancing energy density and charge-discharge characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the filling factor of active material is increased to 80% or more, then the energy density is improved, but the utilization factor of active material is reduced to 80% or less
Solution Approach 1:
The electrode uses a porous sintered body structure with controlled pore diameter (0.03-0.10 μm) and porosity (10-30%). This porous structure allows sufficient electrolyte penetration to maintain high active material utilization (80% or more) while achieving high filling factor (80% or more), resolving the contradiction between energy density and utilization factor
Solution Approach 2:
The invention optimizes specific physical parameters of the sintered body including pore diameter (0.03-0.10 μm), porosity (10-30%), and specific surface area (0.3-2.0 m²/g). By precisely controlling these parameters, the electrode achieves both high filling factor for energy density and sufficient electrolyte access for high utilization factor
2Quantity of substance
If the filling factor of active material is increased to improve energy density, then the battery capacity is improved, but the charge-discharge characteristics become insufficient
Solution Approach 1:
The porous sintered body structure with optimized pore diameter (0.03-0.10 μm) and porosity (10-30%) enables simultaneous achievement of high battery capacity through high filling factor and excellent charge-discharge characteristics through sufficient electrolyte penetration and ion transport
Solution Approach 2:
By optimizing the specific surface area (0.3-2.0 m²/g) and pore structure parameters, the invention achieves high battery capacity while maintaining excellent charge-discharge characteristics, resolving the contradiction between capacity and speed
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
This configuration results in a lithium rechargeable battery with high energy density and excellent charge-discharge characteristics, maintaining a high active material utilization factor and reducing resistance to ionic conductivity, while preventing electrolyte impregnation issues and voltage drops.
Implementation Method 1
The lithium titanate sintered body has a mean fine pore diameter of 0.10 to 0.20 μm, a specific surface area of 1.0 to 3.0 m²/g, and a relative density of 80 to 90%
Implementation Method 2
The lithium titanate sintered body has a mean fine pore diameter of 0.10 to 0.20 μm, a specific surface area of 1.0 to 3.0 m²/g, and a relative density of 80 to 90%
Data Source
Figure 1
AI summary
A lithium rechargeable battery having a nonaqueous electrolyte held between a positive electrode and a negative electrode is provided. The lithium rechargeable battery has a high energy density and a high battery capacity by enhancing a filling factor of an active material of the positive electrode or the negative electrode. In the lithium rechargeable battery includes the positive electrode, the negative electrode, and the nonaqueous electrolyte held between the positive electrode and the negative electrode, the positive electrode or the negative electrode is comprised of a lithium titanate sintered body. The lithium titanate sintered body has a mean fine pore diameter of 0.10 to 0.20 µm, a specific surface area of 1.0 to 3.0 m2/g, and a relative density of 80 to 90%.