Bendable Secondary Battery Electrolyte for Low-Resistance Interfaces
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Solution Overview
Problem
Lithium-ion secondary batteries face challenges with interface contact resistance and safety due to the large volume change of negative electrode active materials, leading to potential ignition risks and reliability issues, especially in solid-state batteries.
Innovation Solution
Incorporating a third solid electrolyte layer impregnated with an ionic liquid between the positive and negative electrode layers, which improves interface contact and safety by reducing interface resistance and preventing leakage, while allowing for a semi-solid electrolyte structure that enhances flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an organic electrolyte solution is used in lithium-ion batteries, then high capacity and output can be achieved, but safety risks increase due to flammability
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid by using a sulfide-based solid electrolyte, thereby eliminating flammability while maintaining ionic conductivity for high power output
Solution Approach 2:
The patent creates a composite structure by forming an intervening layer that combines the negative electrode active material with the solid electrolyte, achieving both safety and performance requirements
2Object-affected harmful factors
If a solid electrolyte is used to improve safety, then flammability is eliminated, but interface contact resistance increases due to volume change of negative electrode active material
Solution Approach 1:
The patent segments the negative electrode structure by forming an intervening layer between the negative electrode active material and the solid electrolyte, allowing independent optimization of each component's properties
Solution Approach 2:
The patent introduces an intervening layer as a mediator between the negative electrode active material and solid electrolyte, facilitating interface contact and reducing resistance caused by volume changes
3Reliability
If an intervening layer is added between negative electrode and solid electrolyte, then interface contact is improved, but device complexity increases
Solution Approach 1:
The patent merges the intervening layer with the negative electrode active material layer, creating an integrated structure that reduces overall device complexity while maintaining improved interface contact
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 provides a secondary battery with improved interface resistance, safety, and flexibility, enabling the creation of bendable batteries with reduced risk of ignition and enhanced reliability.
Implementation Method 1
the electrolyte layer contains a third solid electrolyte and an ionic liquid, and a space in the electrolyte layer, specifically, a space in the third solid electrolyte is impregnated with the ionic liquid
Implementation Method 2
solid-state batteries having a solid electrolyte instead of an electrolyte solution between a positive electrode and a negative electrode have been explored
Data Source
AI summary
Provided is a secondary battery having a favorable interface contact between an active material and an electrolyte. The secondary battery includes a positive electrode layer, a negative electrode layer, and an electrolyte layer positioned between the positive electrode layer and the negative electrode layer. The positive electrode layer contains a positive electrode active material and a first solid electrolyte, the negative electrode layer contains a negative electrode active material and a second solid electrolyte, the electrolyte layer contains a third solid electrolyte and an ionic liquid, and a space in the third solid electrolyte is impregnated with the ionic liquid. The secondary battery is bendable.