All-solid-state lithium battery antiperovskite electrolyte conductivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
All-solid-state lithium batteries with lithium-ion-conductive antiperovskite materials exhibit reduced electric conductivity when used between positive and negative sintered plates, leading to charging difficulties.
Innovation Solution
Incorporating a solid electrolyte layer composed of lithium-ion-conductive antiperovskite material between a lithium complex oxide sintered positive-electrode plate and a Ti-containing negative-electrode plate, with metal membranes at the interfaces to prevent conductivity reduction, resulting in a battery with high electric conductivity and improved chargeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If lithium-ion-conductive antiperovskite material is used as solid electrolyte between sintered plates, then the battery structure is simplified and manufacturing is easier, but electric conductivity is reduced leading to charging difficulties
Solution Approach 1:
A current collecting layer is introduced as an intermediary component between the positive electrode plate and the solid electrolyte layer. This current collecting layer serves as a mediator that maintains electrical conductivity pathways while allowing the solid electrolyte to function as intended, thereby resolving the contradiction between simplified manufacturing and maintained electric conductivity.
Solution Approach 2:
The battery structure employs composite material design by combining the solid electrolyte layer with a current collecting layer made of conductive material. This composite approach allows the system to benefit from the simplicity of solid electrolyte manufacturing while compensating for conductivity reduction through the conductive current collecting layer.
2Ease of manufacture
If powder-dispersed positive electrodes with binders are used, then the electrode structure is simpler to manufacture, but packing density of active material is reduced leading to lower capacity
Solution Approach 1:
The binder component is completely removed from the positive electrode structure. By extracting the unnecessary binder material, the patent achieves maximum packing density of lithium complex oxide active material while maintaining structural integrity through the sintered plate configuration, thereby resolving the contradiction between manufacturing simplicity and active material density.
3Reliability
If positive electrode plate with oriented crystal planes is used, then stress at interface is reduced improving reliability, but manufacturing process becomes more complex
Solution Approach 1:
The patent controls the crystallographic orientation parameter of the lithium complex oxide sintered plate, specifically orienting crystal planes (003) at low angles relative to the main face. This parameter change in crystal orientation reduces interfacial stress during charging/discharging cycles, improving reliability while the sintering process itself handles the 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 enables an all-solid-state lithium battery with significantly high electric conductivity and reliable charging performance by maintaining the inherent conductivity of the lithium-ion-conductive material, overcoming previous issues of reduced conductivity and charging challenges.
Implementation Method 1
a solid electrolyte layer composed of a lithium-ion-conductive antiperovskite material
Implementation Method 2
with metal membranes at the interfaces to prevent conductivity reduction
Implementation Method 3
a positive-electrode plate composed of a lithium complex oxide sintered body
Implementation Method 4
a negative-electrode plate containing Ti and permitting intercalation and deintercalation of lithium ions at 0.4 V (vs. Li/Li4) or more
Data Source
AI summary
There is provided an all-solid-state lithium battery including: a positive-electrode plate composed of a lithium complex oxide sintered body having a layered rock-salt structure; a solid electrolyte layer composed of a lithium-ion-conductive antiperovskite material; a negative-electrode plate containing Ti and permitting intercalation and deintercalation of lithium ions at 0.4 (vs. Li/Li+) V or more; a positive-electrode current collecting layer provided on a face, remote from the solid electrolyte layer, of the positive-electrode plate; a negative-electrode current collecting layer provided on a face, remote from the solid electrolyte layer, of the negative-electrode plate; a positive-electrode covering metal membrane provided at an interface between the positive-electrode plate and the solid electrolyte layer; and a negative-electrode covering metal membrane provided at an interface between the negative-electrode plate and the solid electrolyte layer.