Coated Solid Electrolyte Particles for Lower Battery Interface Resistance
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Solution Overview
Problem
Existing all-solid-state rechargeable batteries face challenges in reducing interfacial resistance between solid electrolyte particles and positive electrode active materials, which affects cycle-life and rate discharge capacity.
Innovation Solution
A solid electrolyte is developed, comprising solid ion conductor particles coated with a compound represented by Chemical Formula 1 (Li3+aM1bX16+c) and a lithium-deficient layer at the interface between the particles and the coating layer, which reduces interfacial resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrolyte particles are used directly without coating, then the battery structure is simple and easy to manufacture, but the interfacial resistance between solid electrolyte particles and positive electrode active materials is high, affecting cycle-life and rate discharge capacity
Solution Approach 1:
The patent applies composite materials by creating a multi-layered solid electrolyte structure consisting of a core solid ion conductor particle, an intermediate coating layer containing compounds like Li3InCl6 or Li3InBr6, and an outer protective layer. This composite structure reduces interfacial resistance between the solid electrolyte and positive electrode active materials while maintaining manufacturing feasibility through controlled deposition processes
Solution Approach 2:
The patent implements local quality by applying different materials and properties to different regions of the solid electrolyte structure. The coating layer is specifically designed with different chemical composition and electrical properties than the core particle, creating localized regions optimized for ionic conductivity and interfacial contact with the positive electrode, thereby improving cycle-life and rate discharge capacity without complicating the overall manufacturing process
2Reliability
If a coating layer is added to solid ion conductor particles, then interfacial resistance is reduced and ionic conductivity is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent uses an intermediary coating layer composed of compounds such as Li3InCl6, Li3InBr6, or their mixtures with LiCl, LiBr, or LiI. This intermediate layer acts as a mediator between the solid ion conductor particles and the positive electrode active materials, facilitating ionic transport and reducing interfacial resistance. The coating can be applied through controlled chemical deposition or physical vapor deposition methods that maintain ease of manufacture while achieving the desired ionic conductivity enhancement
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 proposed solid electrolyte achieves high cycle-life and rate discharge capacity characteristics while ensuring safety, with improved ionic conductivity and reduced interfacial resistance.
Implementation Method 1
a lithium-deficient layer at an interface between the solid ion conductor particles and the coating layer
Data Source
AI summary
A solid electrolyte, a positive electrode including the same, and an all-solid-state rechargeable battery, the solid electrolyte includes solid ion conductor particles; a coating layer on the solid ion conductor particles, the coating layer including a compound represented by Chemical Formula 1; and a lithium-deficient layer at an interface between the solid ion conductor particles and the coating layer:Li3+aM1bX16+c. [Chemical Formula 1]