Solid Electrolyte Binder for Battery Interface Resistance
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Solution Overview
Problem
All solid-state secondary batteries face increased interface resistance due to the use of hard solid electrolytes, which affects ion conductivity and stability, and existing binders fail to meet current performance requirements.
Innovation Solution
An all solid-state secondary battery design incorporating a binder made of an inorganic solid electrolyte with specific properties, including a carbon-based main chain structure and functional groups, to reduce interface resistance and enhance ion conductivity and high-temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a hard inorganic solid electrolyte is used, then flame resistance and energy density are improved, but interface resistance increases
Solution Approach 1:
A binder comprising a specific high-molecular-weight compound is introduced as an intermediary between the hard inorganic solid electrolyte particles and electrode materials. This binder mediates the interface interactions, reducing contact resistance while maintaining the flame resistance benefits of the inorganic electrolyte. The binder forms a flexible matrix that ensures good contact between rigid components without compromising safety.
Solution Approach 2:
The solid electrolyte is formulated as a composite material combining hard inorganic solid electrolyte particles with a binder comprising a specific high-molecular-weight compound. This composite structure integrates the flame resistance and ion conductivity of inorganic electrolytes with the flexibility and low interface resistance characteristics of the polymer binder, achieving both safety and performance requirements.
2Reliability
If existing high-molecular-weight binders are used, then some interface resistance issues are缓解, but performance requirements are not met
Solution Approach 1:
The binder uses a specific high-molecular-weight compound with carefully controlled parameters: weight-average molecular weight of 10,000 to 1,000,000 and specific functional group content (0.1 to 10 mmol/g). These parameter optimizations enable the binder to achieve both low interface resistance and high-temperature stability, meeting stringent performance requirements that existing binders could not satisfy.
Solution Approach 2:
The binder is designed with specific local chemical properties through functional groups (carboxyl, hydroxyl, amine, or isocyanate groups) that selectively interact with inorganic solid electrolyte surfaces. This localized functional quality enhances interfacial adhesion and ion transport at critical contact points without requiring changes to the entire electrolyte system.
3Ease of manufacture
If conventional binders are used, then manufacturing is simplified, but high-temperature preservation stability deteriorates
Solution Approach 1:
The high-molecular-weight compound is selected with specific parameters including weight-average molecular weight (10,000 to 1,000,000) and functional group content (0.1 to 10 mmol/g). These parameter ranges provide both thermal stability for high-temperature operation and sufficient reactivity for effective binding, maintaining ease of manufacture while achieving superior temperature stability.
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 battery exhibits improved ion conductivity, binding properties, and high-temperature preservation stability, effectively addressing the interface resistance issues and meeting current performance requirements.
Implementation Method 1
an inorganic solid electrolyte having a property of conducting ions of a metal belonging to Group I or II
Data Source
AI summary
An all solid-state secondary battery including: a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer, in which at least any one of the positive electrode active material layer, the negative electrode active material layer, or the solid electrolyte layer includes an inorganic solid electrolyte having a property of conducting ions of a metal belonging to Group I or II of the periodic table and a binder constituted of a specific high-molecular-weight compound.