Garnet Solid Electrolyte Composition for Low-Temperature Sintering
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Solution Overview
Problem
Existing solid electrolytes for electricity storage devices face challenges in achieving high ionic conductivity and thermal shock resistance while maintaining atmospheric stability and low sintering temperatures.
Innovation Solution
A novel solid electrolyte composition incorporating Li, Pr, Zr, O, and M (where M is at least one element from Sb, Bi, As, Ge, and Te) with a garnet-type crystal structure, allowing for sintering at temperatures below 1050°C and achieving improved ionic conductivity and thermal shock resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Pr-containing garnet-type solid electrolytes are used, then high ionic conductivity is achieved, but sintering temperature must be high (above 1050°C) and thermal shock resistance is poor
Solution Approach 1:
The patent modifies the chemical composition parameters of the garnet-type solid electrolyte by incorporating specific elements (Ta, W, Mo, Nb, or Bi) at controlled concentrations (0.01-0.10 mole ratio relative to Pr). This compositional parameter change enables the material to achieve high ionic conductivity while being sinterable at lower temperatures (900-1050°C), thus resolving the contradiction between ionic conductivity and sintering temperature.
Solution Approach 2:
The patent creates a composite solid electrolyte system by combining Pr-containing garnet structure with additional metal elements (Ta, W, Mo, Nb, or Bi). This composite approach allows the material to inherit the high ionic conductivity of conventional Pr-garnet while gaining enhanced sinterability and thermal shock resistance from the added elements, particularly Bi which forms low-melting-point phases that facilitate sintering at lower temperatures.
2Reliability
If conventional Pr-containing garnet-type solid electrolytes are used, then high ionic conductivity is achieved, but thermal shock resistance is poor
Solution Approach 1:
The patent adjusts the compositional parameters by introducing specific metal elements (particularly Bi) in controlled amounts (0.01-0.10 mole ratio). These compositional modifications change the thermal properties of the solid electrolyte, improving its thermal shock resistance while maintaining high ionic conductivity through the preserved Pr-containing garnet structure.
Solution Approach 2:
The patent develops a composite material system where Pr-containing garnet is combined with additional elements (Ta, W, Mo, Nb, or Bi). The composite structure allows the material to maintain the high ionic conductivity pathway of the garnet structure while the added elements, particularly Bi, provide enhanced thermal shock resistance through low-melting-point phases that accommodate thermal stress.
3Use of energy by stationary object
If sintering temperature is reduced below 1050°C, then manufacturing cost and energy consumption decrease, but ionic conductivity and thermal shock resistance are compromised
Solution Approach 1:
The patent changes the compositional parameters by adding specific metal elements (Ta, W, Mo, Nb, or Bi) that act as sintering aids. These elements enable the solid electrolyte to be sintered at lower temperatures (900-1050°C) while still achieving sufficient density and maintaining high ionic conductivity, thus reducing energy consumption without sacrificing performance.
Solution Approach 2:
The patent uses composite material design where Pr-containing garnet is combined with sintering aid elements (particularly Bi). The composite structure allows low-temperature sintering (reducing energy consumption) while the garnet phase maintains high ionic conductivity and the composite structure provides thermal shock resistance.
4Use of energy by stationary object
If sintering temperature is reduced below 1050°C, then manufacturing cost and energy consumption decrease, but thermal shock resistance is compromised
Solution Approach 1:
The patent modifies compositional parameters by incorporating specific elements (particularly Bi) in controlled amounts. These compositional changes enable low-temperature sintering while simultaneously improving thermal shock resistance, as the added elements form phases that accommodate thermal stress even when sintered at lower temperatures.
Solution Approach 2:
The patent creates a composite material where Pr-containing garnet is combined with sintering aid elements (Ta, W, Mo, Nb, or Bi). This composite structure enables low-temperature sintering (reducing energy consumption) while the composite nature provides enhanced thermal shock resistance through the synergistic effect of the garnet phase and the added elements.
Data Source
AI summary
A solid electrolyte according to the present disclosure contains Li, Pr, Zr, O, and M and includes a crystalline phase having a garnet-type crystal structure, wherein the M is at least one selected from the group consisting of Sb, Bi, As, Ge, and Te. An electricity storage device according to the present disclosure may be, for example, a battery. The battery includes a positive electrode, a negative electrode, and an electrolyte layer provided between the positive electrode and the negative electrode. At least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer may include the solid electrolyte according to the present disclosure.