Nitrogen-Doped Sulfide Solid Electrolyte for Low H2S Emission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Sulfide electrolytes in all-solid-state batteries are susceptible to hydrogen sulfide generation due to their reaction with moisture, posing safety and durability concerns.
Innovation Solution
A solid electrolyte comprising lithium, phosphorous, sulfur, halogen, and nitrogen elements, with specific molar ratios and incorporating ammonium halides, is developed to suppress hydrogen sulfide generation by forming P-N bonds that preferentially react with moisture instead of P-S bonds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sulfur is incorporated into the solid electrolyte to achieve high lithium-ion conductivity, then ionic conductivity is improved, but hydrogen sulfide generation increases when exposed to moisture
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating nitrogen elements (ammonium halides) into the solid electrolyte system. This modifies the bonding characteristics from P-S bonds to P-N bonds, which have different reactivity toward moisture, thereby reducing hydrogen sulfide generation while maintaining ionic conductivity through appropriate molar ratio adjustments
Solution Approach 2:
The patent creates a composite solid electrolyte system containing multiple elements (Li, P, S, halogen, and nitrogen). By combining ammonium halides with lithium phosphorus sulfide base materials, the invention achieves a composite structure where nitrogen-containing compounds modify the overall chemical behavior, suppressing hydrogen sulfide emission while preserving the conductive properties of the sulfide electrolyte matrix
2Object-affected harmful factors
If the sulfur content is reduced to suppress hydrogen sulfide generation, then safety is improved, but lithium-ion conductivity may deteriorate
Solution Approach 1:
The patent adjusts the molar ratios of Li, P, S, halogen, and nitrogen elements to specific ranges. By controlling these compositional parameters, the invention achieves optimal balance between reducing hydrogen sulfide generation (through nitrogen incorporation) and maintaining sufficient lithium-ion conductivity (through appropriate sulfur content and stoichiometry)
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 electrolyte effectively reduces hydrogen sulfide emission while maintaining high lithium-ion conductivity, enhancing safety and durability of all-solid-state batteries.
Implementation Method 1
incorporated nitrogen exhibits suppression of hydrogen sulfide generation while retaining the performance properties of conventional solid electrolytes
Implementation Method 2
a sulfide solid electrolyte with reduced sulfur and incorporated nitrogen exhibits suppression of hydrogen sulfide generation
Implementation Method 3
all-solid-state batteries using a sulfide solid electrolyte synthesized from, e.g., lithium sulfide
Data Source
Figure 1~2
Figure 3~4
AI summary
A solid electrolyte containing a lithium (Li) element, a sulfur (S) element, a phosphorous (P) element, a halogen (X) element, and a nitrogen (N) element. The molar ratio of the difference between the Li and S elements to the P element is 1.5 to 2.2. The molar ratio of the sum of the Li and X elements to the P element is preferably 7.1 to 10.0. The solid electrolyte preferably exhibits diffraction peaks at 2θ = 25.5° ± 1.0°, 29.8° ± 0.5°, and 31.2° ± 1.0° in a diffraction pattern measured by an X-ray diffractometer.