Sulfide Solid Electrolyte Material for High Ion Conductivity
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Solution Overview
Problem
Current lithium batteries require safety devices to prevent temperature increases during short circuits due to the use of flammable organic solvents in liquid electrolytes, and there is a need for a solid electrolyte material with improved ion conductivity to enhance battery output power.
Innovation Solution
A sulfide solid electrolyte material comprising Li, Si, P, and S elements, with optional inclusion of F, Cl, Br, or I, exhibiting specific crystal phases and composition ratios to achieve high ion conductivity, which is synthesized through mechanical milling and heating to form a battery with enhanced output power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If liquid electrolytes containing flammable organic solvents are used in lithium batteries, then the batteries can achieve high energy density, but safety devices are required to suppress temperature increase during short circuits
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid, and chemically replaces flammable organic solvents with non-flammable sulfide-based solid electrolyte materials. This parameter change eliminates the fire hazard while maintaining ionic conductivity, thus resolving the safety concern without sacrificing energy density
Solution Approach 2:
The patent employs composite sulfide solid electrolyte materials containing multiple elements (Li, Si, P, S, and halogens) to achieve both high ionic conductivity and non-flammability. The composite structure allows optimization of both safety and energy storage capabilities
2Device complexity
If solid electrolyte materials are used to replace liquid electrolytes, then safety devices can be simplified and production cost reduced, but ion conductivity must be satisfactory to maintain battery performance
Solution Approach 1:
The patent optimizes the chemical composition parameters of the sulfide solid electrolyte by incorporating specific ratios of Li, Si, P, S, and halogen elements. This compositional parameter optimization achieves high ion conductivity comparable to liquid electrolytes, enabling simplification of safety devices without compromising battery performance
Solution Approach 2:
The patent utilizes the solid phase of electrolyte materials to achieve both safety improvements and satisfactory ion conductivity. By carefully controlling the crystalline or amorphous phase structure of the sulfide solid electrolyte, the material exhibits high ionic conductivity while maintaining solid-state safety advantages
3Power
If sulfide solid electrolyte materials with high ion conductivity are developed, then battery output power can be increased, but the material composition and crystal structure must be precisely controlled
Solution Approach 1:
The patent establishes specific compositional parameters (ratios of Li, Si, P, S, and halogen elements) and crystallographic parameters (peak positions in XRD patterns) that directly correlate with high ion conductivity. By controlling these parameters within defined ranges, the material achieves optimal performance for high power battery applications
Solution Approach 2:
The patent employs mechanical milling to synthesize the sulfide solid electrolyte material, replacing more complex conventional solid-state reaction methods. This mechanical approach simplifies the manufacturing process while achieving precise compositional control and high ion conductivity, enabling scalable production of high power battery materials
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 sulfide solid electrolyte material provides satisfactory ion conductivity, simplifying safety measures and increasing battery output power by using a non-flammable solid electrolyte, thus improving battery performance and safety.
Implementation Method 1
a sulfide solid electrolyte material having satisfactory ion conductivity
Implementation Method 2
a peak at a position of 2θ=30.12°±1.00° measured by X-ray diffractometry using CuKα ray
Implementation Method 3
synthesizing an amorphized ion conductive material by mechanical milling
Implementation Method 4
a heating step of obtaining the sulfide solid electrolyte material by heating the amorphized ion conductive material
Data Source
AI summary
An object of the present invention is to provide a sulfide solid electrolyte material having satisfactory ion conductivity. In the present invention, the above object is solved by providing a sulfide solid electrolyte material comprising a Li element, a Si element, a P element, a S element, and an X element (in which X represents at least one of F, Cl, Br and I), the sulfide solid electrolyte material having a crystal phase B having a peak at the position of 2θ=30.12°±1.00° measured by X-ray diffractometry using CuKα ray.