Coated Solid Electrolyte for Low-Resistance All-Solid-State Batteries
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Solution Overview
Problem
Existing all-solid-state rechargeable batteries face challenges with 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 with a coating layer containing compounds represented by Chemical Formulas 1 and 2, which reduce interfacial resistance and enhance ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte is used to eliminate liquid electrolyte leakage and improve safety, then safety is improved, but interfacial resistance between solid electrolyte particles and positive electrode active materials increases
Solution Approach 1:
The patent introduces a coating layer as an intermediary substance between the solid electrolyte particles and the positive electrode active material. This coating layer mediates the interface, reducing interfacial resistance while maintaining the safety benefits of solid electrolytes. The coating acts as a bridge that facilitates charge transfer without compromising the fundamental safety advantage of using solid instead of liquid electrolyte.
Solution Approach 2:
The patent creates a composite structure by combining the solid electrolyte particles with a coating layer material. This composite approach allows the system to exhibit properties of both components: the safety and ionic conductivity of the solid electrolyte, plus the low interfacial resistance and improved charge transfer characteristics of the coating material.
2Reliability
If solid ion conductor particles are used to maintain ionic conductivity, then ionic conductivity is maintained, but interfacial resistance with positive electrode active material increases affecting cycle-life and rate discharge capacity
Solution Approach 1:
The coating layer serves as an intermediary that protects the solid ion conductor particles from degradation during cycling while facilitating sustained charge transfer. This mediator prevents direct harmful interactions between the solid electrolyte and electrode materials, thereby extending cycle-life without reducing ionic conductivity.
Solution Approach 2:
The patent modifies the surface properties of the solid ion conductor particles by applying a coating layer with different chemical and physical parameters. This parameter change at the surface level improves interfacial compatibility and stability, enabling longer cycle-life while preserving the bulk ionic conductivity of the solid electrolyte.
3Reliability
If solid ion conductor particles are used to maintain ionic conductivity, then ionic conductivity is maintained, but interfacial resistance affects rate discharge capacity
Solution Approach 1:
The coating layer acts as a mediator that enhances charge transfer kinetics at the interface between solid electrolyte particles and positive electrode active material. This intermediary facilitates faster ion and charge exchange, thereby improving rate discharge capacity while maintaining the high ionic conductivity characteristic of solid electrolytes.
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 and maintaining ionic conductivity comparable to liquid electrolytes.
Implementation Method 1
a solid electrolyte including solid ion conductor particles; and a coating layer on a surface of the solid ion conductor particles... maintain ionic conductivity comparable to liquid electrolytes
Data Source
AI summary
A solid electrolyte, a positive electrode, and an all-solid-state rechargeable battery, the solid electrolyte includes solid ion conductor particles; and a coating layer on a surface of the solid ion conductor particles, wherein the coating layer includes a compound represented by Chemical Formula 1 and a compound represented by Chemical Formula 2,Li3+aM1bX16+c [Chemical Formula 1]LiX2. [Chemical Formula 2]