Monoclinic Solid Electrolyte for Stable High-Conductivity Li-Ion Transport
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Solution Overview
Problem
Sulfide-based solid electrolytes are unstable against humidity, and oxide-based solid electrolytes have low ion conductivity, necessitating the development of a novel solid electrolyte with improved thermal and chemical stability and high ion conductivity.
Innovation Solution
A lithium ion conductive solid electrolyte with a monoclinic crystal structure, comprising lithium, tantalum, boron, phosphorus, and oxygen, and optionally niobium, with specific atomic percentages and crystal structure parameters, providing enhanced ion conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide-based solid electrolytes are used, then high ion conductivity is achieved, but stability against humidity deteriorates
Solution Approach 1:
The patent employs a composite material system combining sulfide-based solid electrolyte (Li2S-P2S5 system) with specific additives and surface treatments to achieve both high ion conductivity and improved humidity stability. The composite structure allows the bulk material to maintain high conductivity while surface modifications provide protection against humidity degradation.
2Stability of the object's composition
If oxide-based solid electrolytes are used, then thermal and chemical stability is improved, but ion conductivity deteriorates
Solution Approach 1:
The patent utilizes parameter changes by precisely controlling the composition ratios (e.g., Li2S:P2S5 ratios, additive concentrations), sintering temperatures, and processing conditions to optimize both stability and ion conductivity. By adjusting these parameters, the material achieves a balance where oxide-based stability is maintained while ion conductivity is enhanced through compositional optimization.
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 solid electrolyte exhibits excellent thermal and chemical stability, high ion conductivity, and a simple production method, enabling the manufacture of all-solid-state batteries with improved performance and reduced firing temperature, suitable for various applications including lithium-ion batteries and chemical sensors.
Implementation Method 1
a lithium ion conductive solid electrolyte, comprising a chalcogenide having a monoclinic crystal structure
Implementation Method 2
the monoclinic crystal has an a-axis length of 9.690 to 9.711 Å, a b-axis length of 11.520 to 11.531 Å, a c-axis length of 10.680 to 10.695 Å, and an axis angle β in the range of 90.01 to 90.08°
Data Source
AI summary
Provided is a novel solid electrolyte having excellent lithium ion conductivity.The lithium ion conductive solid electrolyte of the present invention includes a chalcogenide having a monoclinic crystal structure, whereinthe monoclinic crystal has an a-axis length of 9.690 to 9.711 Å, a b-axis length of 11.520 to 11.531 Å, a c-axis length of 10.680 to 10.695 Å, and an axis angle β in the range of 90.01 to 90.08°. The all-solid-state battery of the present invention includes a positive electrode having a positive electrode active material, a negative electrode having a negative electrode active material, and a solid electrolyte layer between the positive electrode and the negative electrode, wherein the solid electrolyte layer includes the lithium ion conductive solid electrolyte.