Sulfide Solid Electrolyte Ion Conductivity via K and P Doping
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Solution Overview
Problem
Current solid electrolyte materials for lithium batteries lack favorable ion conductivity, which hinders the development of high-output batteries.
Innovation Solution
A sulfide solid electrolyte material comprising Li, K, Si, and P elements, with specific molar fractions and crystal structure characteristics, is developed to enhance ion conductivity, including a crystal phase with a peak at 2θ=29.58° and a producing method involving mechanical milling and heating to achieve high crystal phase ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sulfide solid electrolyte material is used to replace liquid electrolyte, then safety is improved and production cost is reduced, but ion conductivity is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte by incorporating specific ratios of Li, K, Si, and P elements. The molar fraction of P element to total Si and P elements is controlled at 0.5≤P/(Si+P)≤0.7, and K element to total Li and K elements is controlled at 0<... These parameter adjustments optimize the crystal structure to achieve both high ion conductivity and safety.
Solution Approach 2:
The patent creates a composite sulfide solid electrolyte material combining multiple elements (Li, K, Si, P, S) in specific proportions. This composite approach leverages the beneficial properties of each element: Li for ion conductivity, K for structural stability, Si for chemical stability, and P for enhancing overall performance, achieving both safety and high power output.
2Ease of manufacture
If conventional solid electrolyte materials are used, then production cost is reduced, but ion conductivity remains insufficient for high-output batteries
Solution Approach 1:
The patent optimizes manufacturing parameters by controlling the molar fractions of constituent elements within specific ranges (P/(Si+P) = 0.5-0.7, K/(Li+K) = 0<...). These parameter specifications enable consistent production of high-performance electrolyte material while maintaining cost-effectiveness through a straightforward synthesis process using conventional raw 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 achieves favorable ion conductivity, enabling the production of high-output batteries with improved safety and reduced production costs by eliminating flammable organic solvents.
Implementation Method 1
A sulfide solid electrolyte material with favorable ion conductivity
Implementation Method 2
having a peak at a position of 2θ=29.58°±0.50° in X-ray diffraction measurement using a CuKα ray
Data Source
AI summary
A sulfide solid electrolyte material includes Li, K, Si, P and S elements; a peak at 2θ=29.58°±0.50° and not having a peak at a position of 2θ=27.33°±0.50° in X-ray diffraction measurement using a CuKα ray, or when a diffraction intensity at the peak of 2θ=29.58°±0.50° is regarded as IA and a diffraction intensity at the peak of 2θ=27.33°±0.50° is regarded as IB having a peak at the position of 2θ=27.33°±0.50°, a value of IB/IA is less than 1; a P element molar fraction (P/(Si+P)) to a Si element total and the P element satisfies 0.5≦P/(Si+P)≦0.7, and a K element molar fraction (K/(Li+K)) to a Li element total and the K element satisfies 0<K/(Li+K)≦0.1.