Solid Electrolyte Composition for Stable High-Conductivity Batteries
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Solution Overview
Problem
Current lithium solid-state battery technologies face challenges in achieving improved reliability, capacity, thermal characteristics, lifetime, and recharge performance to meet the demands of increasing mobile devices, hybrid/electric automobiles, and Internet-of-Things devices.
Innovation Solution
A solid electrolyte material comprising Li, T, X, and A, where T is at least one of P, As, Si, Ge, Al, and B, X is a halogen or N, and A is one or more of S and Se, with specific X-ray diffraction peaks, is used to form a solid electrolyte layer in lithium solid-state batteries, enhancing ionic conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte materials are used, then manufacturing is simpler, but ionic conductivity and capacity retention are insufficient
Solution Approach 1:
The patent employs composite solid electrolyte materials combining multiple elements (Li, P, S, Si, B, Al, Ge, As, Se, Te) to achieve superior ionic conductivity and capacity retention. The composite structure allows synergistic effects among different elements, resolving the contradiction between improved reliability and material complexity by creating a multi-functional electrolyte system.
Solution Approach 2:
The patent systematically varies compositional parameters (ratios of Li, P, S, and other elements) and processing parameters (sintering temperature, time, and atmosphere) to optimize electrolyte performance. This parameter optimization approach enables achieving high ionic conductivity and capacity retention while managing the complexity of multi-element compositions.
2Quantity of substance
If higher capacity batteries are developed, then energy storage increases, but thermal stability and safety deteriorate
Solution Approach 1:
The patent utilizes phase transition parameters and compositional ratios to achieve high lithium capacity while maintaining thermal stability. By carefully controlling the stoichiometry and processing conditions, the electrolyte achieves optimal performance at elevated temperatures without compromising safety.
Solution Approach 2:
The patent converts the potential harm of high-capacity materials (which often exhibit poor thermal stability) into benefit by selecting specific element combinations that inherently provide both high capacity and thermal resistance. The multi-element composition transforms what would be conflicting requirements into synergistic properties.
3Reliability
If solid electrolyte density is increased, then ionic conductivity improves, but mechanical fragility increases
Solution Approach 1:
The patent employs composite materials with multiple elements that provide both high ionic conductivity and mechanical strength. The combination of different sized atoms and bonding characteristics in the multi-element electrolyte creates a structure that is both conductive and mechanically robust, resolving the contradiction between density/conductivity and mechanical strength.
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 material improves capacity retention, resistance, and stability at elevated temperatures, with high ionic conductivity and mechanical properties that support efficient energy storage and utilization in lithium solid-state batteries.
Implementation Method 1
enhancing ionic conductivity
Implementation Method 2
may include glass ceramic and/or mixed crystalline phases
Data Source
AI summary
A solid electrolyte material comprises Li, T, X and A wherein T is at least one of P, As, Si, Ge, Al, and B; X is one or more halogens or N; A is one or more of S and Se. The solid electrolyte material has peaks at 17.8°±0.75° and 19.2°±0.75° in X-ray diffraction measurement with Cu-Kα(1,2)=1.5418 Å and may include glass ceramic and/or mixed crystalline phases.