All-Solid Battery Anode Coating for Low-Resistance Interfaces
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Solution Overview
Problem
All-solid batteries face challenges such as increased interfacial resistance and the risk of short-circuits due to surface roughness of the solid electrolyte layer and uneven current distribution, which affect their cycle characteristics and safety.
Innovation Solution
The implementation of a conformal coating layer with excellent conformality on the solid electrolyte layer, combined with a porous anode current collector and a carbonaceous anode active material, helps to reduce interfacial resistance and prevent short-circuits by ensuring uniform current distribution and maintaining electrical conductivity in the anode layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte layer is used instead of an electrolytic solution, then safety is improved by reducing fire risk, but interfacial resistance increases and surface roughness causes uneven current distribution
Solution Approach 1:
A conformal coating layer is introduced as an intermediary between the solid electrolyte layer and the anode active material layer. This coating layer mediates the interface, reducing interfacial resistance while maintaining the safety benefits of the solid electrolyte. The coating ensures uniform current distribution by conformally covering the solid electrolyte surface, thereby eliminating the harmful effects of surface roughness.
Solution Approach 2:
The surface roughness of the solid electrolyte layer is controlled to be 2 μm or less by adjusting manufacturing parameters. This parameter change reduces the unevenness of the surface, thereby minimizing uneven current distribution and improving overall battery performance while maintaining the inherent safety advantages of solid electrolytes.
2Stability of the object's composition
If the surface roughness of the solid electrolyte layer is reduced, then current distribution uniformity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The conformal coating layer serves as a mediator that compensates for surface roughness issues. By applying this coating, the invention achieves uniform current distribution even when the solid electrolyte surface has some roughness, thereby reducing the stringency of manufacturing precision requirements while maintaining electrical performance.
3Reliability
If a conformal coating layer is added to reduce interfacial resistance, then electrical conductivity is improved, but device complexity increases
Solution Approach 1:
The conformal coating layer is designed with porous characteristics that allow it to conformally cover the solid electrolyte surface while maintaining good electrical contact. This porous structure enables the coating to adapt to surface roughness variations, improving electrical conductivity without requiring excessive manufacturing complexity.
Data Source
AI summary
The all-solid battery includes: a cathode layer including a cathode active material layer, an anode layer, and a solid electrolyte layer that is disposed between the cathode layer and the anode layer and includes a solid electrolyte, wherein the anode layer includes a porous anode current collector; a first anode active material layer including a first metal and a carbonaceous anode active material disposed on the porous anode current collector; a conformal coating layer including a second metal disposed on the first anode active material layer, wherein the conformal coating layer of the anode layer is between the first anode active material layer and the solid electrolyte layer, and a surface roughness of the solid electrolyte layer, proximate to the conformal coating layer, is about 2 micrometers or less.