Lattice-Matched Solid-State Electrolyte for Grain Boundary Suppression
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Solution Overview
Problem
Current solid-state batteries face challenges with ion conductivity at grain boundaries, high sintering temperatures, and interface cracking, which hinder practical application and lead to decreased performance.
Innovation Solution
A solid-state electrolyte comprising a combination of a perovskite structure and an antiperovskite structure with similar lattice constants, allowing for a lattice-matched state and reduced grain boundary formation, which enhances ion conductivity and cyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid-state electrolyte with perovskite structure is used, then ion conductivity is improved, but grain boundary formation occurs which reduces performance
Solution Approach 1:
The patent combines perovskite structure solid-state electrolyte particles with antiperovskite structure solid-state electrolyte particles to form a composite solid-state electrolyte. This composite structure suppresses grain boundary formation while maintaining high ion conductivity, resolving the contradiction between improving ion conductivity and preventing grain boundary formation that reduces performance.
2Manufacturing precision
If high sintering temperature is applied, then density is improved, but interface cracking occurs which reduces reliability
Solution Approach 1:
The patent changes the sintering temperature parameter to a moderate range of 900°C to 1100°C, avoiding the high temperatures that cause interface cracking. This temperature optimization allows achieving sufficient density while preventing thermal stress-induced cracking at interfaces, thus resolving the contradiction between improving density and preventing interface cracking.
3Reliability
If perovskite and antiperovskite structures are combined, then lattice matching suppresses grain boundaries, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by specifying that only the surface portions of the solid-state electrolyte particles should have the perovskite or antiperovskite structures with lattice constants within 5% of each other, while the interior can have different compositions. This localized structural requirement achieves grain boundary suppression at interfaces without requiring complete structural uniformity throughout the entire material, thereby reducing manufacturing complexity.
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 results in improved ion conductive properties, suppressing cracking and peeling, and enabling superior charge and discharge cyclability with fast charging capabilities.
Implementation Method 1
the first solid-state electrolyte part and the second solid-state electrolyte part have the respective lattice constants that are similar to each other. This allows for formation of an ionic bond in a lattice-matched state
Implementation Method 2
formation of an ionic bond in a lattice-matched state
Implementation Method 3
improve an ion conductive property
Data Source
AI summary
A solid-state electrolyte that includes: a first solid-state electrolyte part and a second solid-state electrolyte part. The first solid-state electrolyte part has a perovskite structure having a lattice constant that is an integer multiple of a value of greater than or equal to 3.8 Å and less than or equal to 4.1 Å. The second solid-state electrolyte part has an antiperovskite structure having a lattice constant that is an integer multiple of a value of greater than or equal to 3.8 Å and less than or equal to 4.1 Å.