Li-Ta-B-P-O Solid Electrolyte for Low-Temperature Sintering
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Solution Overview
Problem
Oxide solid electrolytes used in all-solid-state batteries face high grain boundary resistance, requiring high-temperature sintering to achieve sufficient ion conductivity, which can lead to decomposition and quality alteration of other materials, making it economically inefficient.
Innovation Solution
A solid electrolyte material comprising lithium, tantalum, boron, phosphorus, and oxygen, with specific atomic content ranges and amorphous structure, allowing for sufficient ion conductivity when fired at temperatures of 900° C. or less, thereby reducing processing costs and material degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature sintering is used to achieve sufficient ion conductivity, then ion conductivity is improved, but material decomposition and quality alteration occur
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte by incorporating specific ratios of Li, Ta, B, P, and O elements. This compositional modification enables the material to achieve sufficient ion conductivity at lower sintering temperatures (900°C or less), thereby preventing decomposition and quality alteration of electrode materials while maintaining reliable battery performance
Solution Approach 2:
The patent creates a composite solid electrolyte material combining multiple elements (Li-Ta-B-P-O system) with specific atomic ratios. This composite structure leverages the synergistic effects of different elements to reduce grain boundary resistance and enable low-temperature sintering, resolving the contradiction between achieving high ion conductivity and preventing material degradation
2Reliability
If high-temperature sintering is used to form high density sintered body, then ion conductivity is improved, but processing costs increase
Solution Approach 1:
The patent modifies the chemical composition parameters of the solid electrolyte to include specific ratios of Li (5.0-20.0 atomic %), Ta (10.6-16.6 atomic %), B (0.1-5.0 atomic %), and P (5.3-8.8 atomic %). This compositional optimization enables dense sintered bodies to be formed at lower temperatures (900°C or less), significantly reducing energy consumption and processing costs while maintaining sufficient ion conductivity for practical battery applications
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 enables the production of all-solid-state batteries with sufficient lithium ion conductivity at lower firing temperatures, enhancing economic efficiency and preventing material decomposition.
Implementation Method 1
the solid electrolyte needs to be fired at a high temperature of, for example, about 1100° C.
Implementation Method 2
LiTa2PO8, which has a monoclinic crystal structure, exhibits a high lithium ion conductivity
Data Source
AI summary
One embodiment of the present invention relates to a solid electrolyte material, a solid electrolyte, a method for producing the solid electrolyte, or an all-solid-state battery, and the solid electrolyte material includes lithium, tantalum, boron, phosphorus, and oxygen as constituent elements, wherein a peak position of a peak having the maximum peak intensity among an 11B-NMR peak is in the range of -15.0 to -5.0 ppm.