Self-Healing Binder for All-Solid-State Battery Interfacial Stability
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Solution Overview
Problem
All-solid-state batteries face interfacial contact loss due to volume changes of the active material during charging and discharging, leading to reduced initial discharge capacity and Coulombic efficiency.
Innovation Solution
A binder for all-solid-state batteries is developed, comprising a main chain crosslinked by a compound with two or more thiol functional groups, incorporating aromatic vinyl and conjugated diene-based monomer-derived repeating units, and polar functional groups, which exhibits 'self-healing' properties to prevent interfacial contact loss with the solid electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional binder is used in all-solid-state batteries, then the battery structure is simple and easy to manufacture, but interfacial contact loss occurs due to volume changes of the active material during charging and discharging
Solution Approach 1:
The binder's chemical structure is modified by incorporating aromatic vinyl monomer-derived repeating units and conjugated diene-based monomer-derived repeating units with specific functional groups, changing the physical and chemical parameters of the binder to enable crosslinking reactions that maintain interfacial contact stability during battery operation
Solution Approach 2:
The binder is designed as a composite polymer structure combining aromatic vinyl monomer units and conjugated diene-based monomer units with polar functional groups, creating a multi-component molecular system that provides both mechanical flexibility and chemical reactivity for self-healing properties
2Reliability
If the binder uses crosslinking structure with thiol functional groups, then self-healing properties are achieved to prevent interfacial contact loss, but the manufacturing process becomes more complex
Solution Approach 1:
The binder is pre-synthesized with dormant crosslinking functionality incorporated into the polymer chain during manufacturing, allowing the crosslinking network to form in advance or be activated later under controlled conditions, thereby simplifying the overall manufacturing process while maintaining self-healing capability
Solution Approach 2:
The binder contains thiol functional groups that can autonomously undergo crosslinking reactions in response to volume changes of the active material, enabling the binder to self-adjust and self-repair interfacial contact without requiring external intervention or complex manufacturing processes
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 binder improves initial discharge capacity and Coulombic efficiency by preventing interfacial contact loss, enhancing electrochemical and lifetime characteristics of the battery.
Implementation Method 1
a main chain crosslinked by a compound comprising two or more thiol functional groups
Implementation Method 2
the main chain further comprises a polar functional group, thereby to exhibit so-called 'self-healing' properties, i.e., preventing interfacial contact loss with the solid electrolyte
Data Source
Figure 1~2
Figure 3~4a
Figure 4b
AI summary
The present disclosure relates to a binder for an all-solid-state battery comprising a main chain crosslinked by a compound comprising two or more thiol functional groups, wherein the main chain comprises an aromatic vinyl monomer-derived repeating unit and a conjugated diene-based monomer-derived repeating unit; a positive electrode for an all-solid-state battery comprising the binder for an all-solid-state battery, a conductive material, a positive electrode active material, and a solid electrolyte; and an all-solid-state battery comprising a positive electrode, a negative electrode, and a solid electrolyte layer disposed between the positive electrode and the negative electrode, wherein the positive electrode comprises the positive electrode for an all-solid-state battery.