Nonaqueous Electrolyte Ceramic Gradient for Short Circuit Load
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Solution Overview
Problem
Lithium ion nonaqueous electrolyte secondary batteries face challenges in maintaining battery characteristics, such as energy density and cycle life, when a short circuit occurs due to deformation, as the load increase degrades the impregnating ability of the electrolyte solution, leading to reduced performance.
Innovation Solution
A nonaqueous electrolyte composition is developed using a ceramic powder with specific particle size and surface area, applied in a concentration gradient to the electrodes, enhancing the load-bearing capacity during a short circuit without compromising battery characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a ceramic is applied to the surface of electrodes to prevent deformation and short circuits, then the load-bearing capacity during short circuit is improved, but the impregnating ability of electrolytic solution into the electrodes is degraded
Solution Approach 1:
The patent applies ceramic particles with specific properties (average particle size of 0.1 to 2.5 μm and BET specific surface area of 0.5 to 11 m²/g) to the electrode surfaces where short circuit prevention is most critical, while maintaining electrolyte access in other regions. This localized application of ceramic with controlled particle size and surface area provides mechanical strength exactly where needed without broadly blocking electrolyte impregnation across the entire electrode structure.
2Quantity of substance
If the exterior package is simplified to increase capacity, then the energy density is improved, but the resistance to deformation and short circuit is degraded
Solution Approach 1:
The patent creates a composite structure by combining ceramic particles with electrode materials. The ceramic component provides mechanical strength and deformation resistance, while the electrode material maintains electrochemical functionality and energy storage capacity. This composite approach allows the battery to achieve both high energy density (through simplified packaging) and adequate mechanical protection against short circuits.
Data Source
AI summary
A nonaqueous electrolyte composition includes an electrolyte salt, a nonaqueous solvent, a matrix polymer, and a ceramic powder, wherein the ceramic powder has an average particle size of 0.1 to 2.5 μm and a BET specific surface area of 0.5 to 11 m2/g.