LiTa2PO8 Solid Electrolyte Low-Temperature Sintering
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Solution Overview
Problem
Oxide solid electrolytes in all-solid-state batteries face challenges with high grain boundary resistance, requiring both compression molding and sintering at high temperatures to achieve sufficient ion conductivity and relative density, which is economically inefficient and difficult to balance.
Innovation Solution
A lithium ion conductive solid electrolyte composition based on LiTa2PO8 combined with LiTa3O8, Ta2O5, and TaPO5, with specific stoichiometric formulas and elemental ratios, allowing for sufficient ion conductivity and relative density even at low firing temperatures (≤900°C).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperature sintering is used to achieve sufficient ion conductivity and relative density, then the solid electrolyte performance is improved, but manufacturing cost increases and equipment requirements become more stringent
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte by incorporating LiTa3O8, Ta2O5, and TaPO5 phases alongside LiTa2PO8, with specific atomic percentage ranges for Li (5-20%), Ta (10.6-16.6%), and P (5.3-8.3%). This compositional parameter change enables the material to achieve high ion conductivity and relative density at lower sintering temperatures (≤900°C), resolving the contradiction between performance and manufacturing cost.
Solution Approach 2:
The patent creates a composite solid electrolyte material consisting of multiple phases: LiTa2PO8 monoclinic crystal structure combined with LiTa3O8, Ta2O5, and/or TaPO5. This composite structure leverages the synergistic effects of different phases to achieve both high ion conductivity and high relative density at reduced sintering temperatures, thereby improving ease of manufacture while maintaining reliability.
2Manufacturing precision
If high temperature sintering is used to obtain high relative density, then the solid electrolyte quality is improved, but energy consumption increases and equipment complexity increases
Solution Approach 1:
The patent modifies the compositional parameters by introducing specific oxide phases (Ta2O5, TaPO5, LiTa3O8) into the LiTa2PO8 system with controlled atomic percentages. This parameter change reduces the sintering temperature required to achieve high relative density (≥90%), thereby reducing energy consumption and equipment complexity while maintaining manufacturing precision.
3Ease of manufacture
If low firing temperature is used to reduce manufacturing cost, then economic efficiency is improved, but ion conductivity and relative density are insufficient
Solution Approach 1:
The patent develops a composite material system where LiTa2PO8 is combined with LiTa3O8, Ta2O5, and/or TaPO5 phases. This composite structure enables the solid electrolyte to achieve sufficient ion conductivity and relative density at low firing temperatures (≤900°C), thus improving economic efficiency without sacrificing reliability.
Solution Approach 2:
By adjusting the atomic percentages of constituent elements (Li: 5-20%, Ta: 10.6-16.6%, P: 5.3-8.3%) and controlling the phase composition ratios, the patent optimizes the material properties to achieve high performance at low processing temperatures, resolving the contradiction between ease of manufacture 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 solution enables the production of solid electrolytes with high ion conductivity and relative density at lower temperatures, improving economic efficiency and preventing material decomposition or short circuits in all-solid-state batteries.
Implementation Method 1
a powder of the solid electrolyte material needs to be not only compression molded, but also sintered into a high density solid electrolyte
Data Source
AI summary
A lithium ion conductive solid electrolyte or an all-solid-state battery. The lithium ion conductive solid electrolyte satisfies any of (I) to (III): (I) having a crystal structure based on LiTa2PO8 and a crystal structure based on at least one compound selected from LiTa3O8, Ta2O5, and TaPO5; (II) being represented by the stoichiometric formula of Lia1Tab1Bc1Pd1Oe1 where 0.5<a1<2.0, 1.0<b1≤2.0, 0<c1<0.5, 0.5<d1<1.0, and 5.0<e1≤8.0; (III) being represented by the stoichiometric formula of Lia2Tab2Mac2Bd2Pe2Of2 where 0.5<a2<2.0, 1.0<b2≤2.0, 0<c2<0.5, 0<d2<0.5, 0.5<e2<1.0, and 5.0<f2≤8.0, and Ma is one or more elements selected from the group consisting of Nb, Zr, Ga, Sn, Hf, Bi, W, Mo, Si, Al, and Ge.