Solid Electrolyte Composition 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 a lithium ion conductive compound with tantalum, phosphorus, and oxygen, combined with a boron, bismuth, or phosphorus compound, allowing for amorphous structure and sintering at low temperatures (≤900°C) to achieve sufficient ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature sintering is performed 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, P, and additive elements (B, Bi, or P compounds). This compositional parameter change enables the material to achieve sufficient ion conductivity at lower sintering temperatures (≤900°C), thereby preventing decomposition of electrode materials while maintaining reliable ion conductivity performance.
Solution Approach 2:
The patent creates a composite solid electrolyte material by combining the base compound (a) containing Li, Ta, P, and O with at least one compound (b) selected from boron compounds, bismuth compounds, or phosphorus compounds. This composite structure synergistically improves ion conductivity and enables low-temperature sintering, resolving the contradiction between achieving high ion conductivity and preventing material decomposition.
2Reliability
If high-temperature sintering is performed to reduce grain boundary resistance, then ion conductivity is improved, but economic efficiency decreases due to equipment requirements
Solution Approach 1:
By modifying the chemical composition parameters to include specific ratios of Li, Ta, P, and additive elements (B, Bi, or P compounds), the material achieves sufficient ion conductivity at lower sintering temperatures (≤900°C). This parameter change reduces equipment requirements and manufacturing costs, thereby improving economic efficiency while maintaining reliable ion conductivity.
Solution Approach 2:
The composite structure combining base compound (a) with additive compounds (b) creates a material that requires lower sintering temperatures for adequate ion conductivity. This reduces the need for expensive high-temperature equipment and energy consumption, improving ease of manufacture and economic efficiency.
3Reliability
If high-temperature sintering is performed to achieve high density, then ion conductivity is improved, but energy consumption increases
Solution Approach 1:
The patent optimizes compositional parameters by incorporating specific ratios of Li, Ta, P, and additive elements (B, Bi, or P compounds), enabling the material to achieve high density and sufficient ion conductivity at lower sintering temperatures (≤900°C). This significantly reduces energy consumption compared to conventional high-temperature sintering processes.
Solution Approach 2:
The composite solid electrolyte material combining base compound (a) with additive compounds (b) achieves adequate density and ion conductivity at lower sintering temperatures. This reduces the thermal energy input required for sintering, thereby decreasing overall energy consumption while maintaining reliable battery performance.
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 a sintered body with sufficient ion conductivity at lower temperatures, enhancing economic efficiency and preventing material decomposition, thus facilitating the manufacture of all-solid-state batteries with improved performance.
Implementation Method 1
the solid electrolyte needs to be fired at a high temperature of, for example, about 1100° C.
Data Source
AI summary
A solid electrolyte material, a solid electrolyte, a method for producing these, and an all-solid-state battery. The solid electrolyte material includes a lithium ion conductive compound (a) including lithium, tantalum, phosphorus, and oxygen as constituent elements, and at least one compound (b) selected from a boron compound, a bismuth compound, and a phosphorus compound, wherein the compound (b) is a compound different from the compound (a).