LISICON Solid Electrolyte Composition for Room-Temperature Li-Ion Conduction
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Solution Overview
Problem
Current solid electrolyte materials for lithium-ion batteries lack high ionic conductivity and stability, particularly at room temperature, and often contain sulfur, which poses safety risks due to hydrogen sulfide generation.
Innovation Solution
A novel solid electrolyte material with a LISICON-type structure composed of Li, Ge, V, and Ga, optimized with specific molar ratios and processing methods to enhance lithium-ion conductivity and stability, free from sulfur, and suitable for all-solid-state batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte materials are used, then structural stability is maintained, but lithium-ion conductivity is insufficient and sulfur content creates safety risks
Solution Approach 1:
The patent changes the chemical composition parameters by completely eliminating sulfur and introducing gallium (Ga) along with optimized ratios of Li, Ge, and V. This compositional parameter change achieves both high lithium-ion conductivity (exceeding 4.0×10−5 S/cm at room temperature) and eliminates safety risks from hydrogen sulfide generation, resolving the contradiction between reliability and harmful factors
Solution Approach 2:
The patent creates a composite solid electrolyte material with a specific multi-element composition (Li, Ge, V, Ga, O) forming a LISICON-type crystal structure. This composite material approach combines multiple elements in optimized proportions to achieve synergistic effects: high ionic conductivity from the crystal structure while eliminating sulfur-related safety hazards, thus resolving the technical contradiction
2Ease of manufacture
If sulfur-containing solid electrolyte materials are used, then manufacturing simplicity is maintained, but safety risks increase due to hydrogen sulfide generation
Solution Approach 1:
The patent modifies the compositional parameters by replacing sulfur with oxygen and introducing gallium, creating a sulfur-free solid electrolyte. This parameter change eliminates hydrogen sulfide generation while maintaining manufacturability through conventional solid-state reaction methods, thus resolving the contradiction between ease of manufacture and harmful factors
3Temperature
If room temperature operation is targeted, then practical application feasibility is improved, but ionic conductivity requirements become more stringent
Solution Approach 1:
The patent optimizes compositional parameters (Li, Ge, V, Ga ratios) and crystal structure parameters (LISICON-type structure) to achieve high lithium-ion conductivity exceeding 4.0×10−5 S/cm at room temperature. This parameter optimization enables practical room temperature operation while meeting stringent conductivity requirements, resolving the contradiction between temperature and reliability
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 material achieves high lithium-ion conductivity exceeding 4.0×10−5 S/cm at room temperature, ensuring excellent charge and discharge characteristics and improved safety by eliminating sulfur, thus enhancing battery performance and safety.
Implementation Method 1
the solid electrolyte material can have a practical lithium-ion conductivity, and can have a high lithium-ion conductivity. Here, a high lithium-ion conductivity is, for example, more than 4.0×10−5 S/cm near room temperature
Data Source
AI summary
A solid electrolyte material according to the present disclosure includes a crystalline phase including Li, Ge, V, Ga, and O, wherein the crystalline phase has a LISICON-type structure. A battery according to the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer disposed between the positive electrode and the negative electrode. At least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer includes the solid electrolyte material according to the present disclosure.