Li2GeO3 Solid Electrolyte for High Conductivity and Safety
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Solution Overview
Problem
Conventional solid electrolyte materials for all-solid-state lithium batteries face issues with decreased ion conductivity in N-rich systems and incomplete prevention of hydrogen sulfide generation, which affects battery safety and longevity.
Innovation Solution
A solid electrolyte material represented by Li2+yGe1−xMxO3, where x satisfies 0≤x<0.5 and y satisfies −0.5<y<0.5, incorporating elements like Mg, Al, Ti, and Ge with a six-coordinate structure, which enhances Li-ion conductivity and prevents hydrogen sulfide generation by omitting N and S.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte materials (N-rich systems) are used, then the battery can operate, but ion conductivity decreases
Solution Approach 1:
The patent changes the chemical composition parameters by using a Li2GeO3-based oxide system instead of conventional N-rich or S-containing solid electrolytes. Specifically, it employs the formula Li2+yGe1−xMxO3 where M is a metal element, eliminating N and S from the composition. This parameter change resolves the contradiction by achieving both high ion conductivity (10^-5 S/cm or higher at room temperature) and complete prevention of hydrogen sulfide generation.
Solution Approach 2:
The patent creates a composite oxide material by incorporating metal element M (such as Al, Ga, In, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Ge, Sn, Sb, Ta, or W) into the Li2GeO3 crystal structure. This composite approach allows the material to maintain the high ion conductivity of the Li2GeO3 base while the specific crystal structure and composition prevent hydrogen sulfide generation, resolving the technical contradiction between conductivity and safety.
2Device complexity
If N-rich solid electrolyte materials are used, then the battery structure is simplified, but ion conductivity decreases
Solution Approach 1:
The patent achieves high ion conductivity (10^-5 S/cm or higher at room temperature) by optimizing the compositional parameters within the Li2+yGe1−xMxO3 system. By controlling the values of x and y and selecting appropriate metal elements M, the material maintains a crystal structure that facilitates lithium ion transport, thereby resolving the contradiction between structural simplicity and high ion conductivity.
3Ease of manufacture
If S-containing solid electrolyte materials are used, then the battery can be manufactured, but hydrogen sulfide is generated affecting safety
Solution Approach 1:
The patent fundamentally changes the chemical composition by eliminating sulfur from the solid electrolyte material. The Li2GeO3-based oxide system with formula Li2+yGe1−xMxO3 contains no S, thereby completely preventing hydrogen sulfide generation while remaining manufacturable through conventional ceramic processing techniques.
Solution Approach 2:
The patent eliminates the harmful element (sulfur) from the composition entirely, converting the potential harm of hydrogen sulfide generation into a benefit of complete safety. The Li2GeO3-based oxide system provides both manufacturability and complete prevention of hydrogen sulfide generation, resolving the contradiction between ease of manufacture and safety.
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 maintains high ion conductivity and prevents hydrogen sulfide generation, ensuring safe and prolonged battery operation by using a Li2GeO3-based oxide with a specific crystal structure, such as monoclinic C12/c1, in lithium batteries.
Implementation Method 1
Li-ion conductivity is exerted
Data Source
AI summary
A solid electrolyte material includes: Li2+yGe1−xMxO3. x satisfies an equation of 0≤x<0.5. y satisfies an equation of −0.5<y<0.5. M represents at least one element selected from Mg, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Ga, Zr, Sn, Nb, Sb, Cu, Sc, Ta, and Hf. Ge has a six-coordinate structure, or the solid electrolyte material has a crystal structure attributed to monoclinic, C12/c1.