Elastic Sheet Tuning for Solid-State Battery Electrode Contact
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Solution Overview
Problem
All-solid-state batteries face issues with maintaining close-contacting forces between electrodes and solid electrolytes due to external forces during charging and discharging, leading to potential cracking and reduced lithium ion mobility, which affects discharge efficiency and cycle-life.
Innovation Solution
An elastic sheet for all-solid-state batteries with a Δ Tan δ value of 0.12 to 0.40, made from materials like acrylic and urethane-based resins, absorbs external forces and maintains contact between electrodes, preventing cracking and enhancing restoring force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressing force is applied to maintain close-contacting force between electrodes and solid electrolyte, then contact between electrodes and solid electrolyte is improved, but cracks may occur in the solid electrolyte reducing lithium ion mobility
Solution Approach 1:
The patent changes the physical parameters of the elastic sheet by controlling the ΔTan δ value (difference between Tan δ at 45°C and 25°C) to be within a specific range. This parameter optimization allows the elastic sheet to provide appropriate pressing force while absorbing excess stress, preventing cracks in the solid electrolyte during battery assembly and charging/discharging cycles.
Solution Approach 2:
The patent introduces an elastic sheet as a flexible component between the electrodes and solid electrolyte. This thin film structure can deform elastically to maintain close contact between components while absorbing mechanical stress, preventing crack formation in the rigid solid electrolyte during battery operation.
2Quantity of substance
If the negative electrode undergoes repeated shrinkage and expansion during charging and discharging, then battery capacity is improved, but the negative electrode may not shrink back to its original thickness reducing lithium ion movement speed
Solution Approach 1:
The elastic sheet acts as a flexible buffer layer that can accommodate the shrinkage and expansion of the negative electrode during charging and discharging cycles. The sheet's elasticity allows it to deform with the electrode volume changes while maintaining structural integrity and continuous contact, ensuring lithium ion pathways remain open.
Solution Approach 2:
The elastic sheet provides beforehand cushioning by being pre-installed between the negative electrode and solid electrolyte. During electrode expansion, the sheet absorbs the mechanical stress before it can damage the solid electrolyte or create gaps that would impede lithium ion movement.
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 elastic sheet effectively disperses external forces, maintains electrode contact, and improves battery performance by preventing cracking and enhancing cycle-life.
Implementation Method 1
an elastic sheet for an all-solid-state battery having a Δ Tan δ value of greater than or equal to 0.12 and less than 0.40
Implementation Method 2
The elastic sheet for an all-solid-state battery according to an embodiment may absorb external force well, disperse the force applied to a solid electrolyte, and exhibit excellent restoring force during a charge and discharge process.
Implementation Method 3
exhibit excellent restoring force during a charge and discharge process
Data Source
AI summary
The present invention relates to an elastic sheet for an all-solid-state battery, and the elastic sheet for an all-solid-state battery has a Δ Tan δ value of 0.12 or greater and less than 40.