Nonaqueous Electrolyte Composition for Short Circuit Resistance
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Solution Overview
Problem
Conventional nonaqueous electrolyte secondary batteries face challenges in achieving high strength against short circuits without compromising battery characteristics, as existing solutions either increase short-circuit resistance at the cost of reduced impregnation and performance or enhance battery characteristics at the expense of strength.
Innovation Solution
A nonaqueous electrolyte composition containing a matrix resin, a filler, and a surfactant, or a matrix resin and a filler with a prescribed aluminum oxide having an alpha-conversion rate of 80% or more, is used to enhance both short-circuit load resistance and battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a ceramic is coated on the surface of an electrode to increase strength against short circuits, then the strength (load) until short circuit is generated is increased, but the impregnation properties of the electrolytic solution into the electrode are easily lowered
Solution Approach 1:
The patent changes the physical and chemical parameters of the electrolyte composition by incorporating specific components (surfactants, aluminum oxide fillers with controlled particle size and composition) to modify the electrolyte's properties. This allows the electrolyte to maintain adequate impregnation capability while the aluminum oxide filler provides mechanical strength to prevent short circuits.
Solution Approach 2:
The patent creates a composite electrolyte system by combining multiple components: nonaqueous solvent, electrolyte salt, matrix resin, aluminum oxide filler (with specific particle size distribution including fine particles ≤0.1 μm), and surfactant. This composite approach allows the electrolyte to simultaneously achieve good impregnation properties and provide mechanical strength through the aluminum oxide network.
2Quantity of substance
If the exterior pack is made simple to achieve high capacity, then the capacity is enhanced, but when deformation is large, a short circuit is easily generated
Solution Approach 1:
The aluminum oxide filler acts as an intermediary mechanical support structure within the electrolyte composition. It provides a rigid framework that maintains physical separation between electrodes and prevents deformation-induced short circuits, while still allowing the electrolyte to function properly.
Solution Approach 2:
The patent modifies the mechanical properties of the electrolyte system by controlling the particle size, composition, and content of aluminum oxide filler, enabling the electrolyte to provide structural support without compromising capacity.
Data Source
AI summary
A nonaqueous electrolyte composition includes: a nonaqueous solvent; an electrolyte salt; a matrix resin; a filler; and a surfactant.