Solid-State Battery Anode Bonding Layer for Low Interfacial Resistance
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Solution Overview
Problem
All solid secondary batteries face challenges with interfacial resistance between the anode and the solid electrolyte layer, leading to degraded charge/discharge characteristics due to gaps or voids between these components.
Innovation Solution
A sub-assembly for an all solid secondary battery is developed, featuring a solid electrolyte layer with a carbon active material layer and a bonding layer. The bonding layer includes first carbon particles and crystalline particles with lithium, carbon, and oxygen atoms, improving the interfacial contact and mechanical structure between the anode and the solid electrolyte layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte layer is used in an all solid secondary battery, then safety and energy density are improved, but interfacial resistance increases due to gap regions or voids between the solid electrolyte layer and the anode
Solution Approach 1:
A bonding layer comprising carbon particles and binder is introduced as an intermediary between the solid electrolyte layer and the anode. This bonding layer fills the gap regions and voids that naturally form at the interface, improving physical contact and reducing interfacial resistance without compromising the safety benefits of the solid electrolyte layer.
Solution Approach 2:
The bonding layer is designed with a porous structure containing carbon particles distributed within a binder matrix. This porous structure allows the bonding layer to effectively fill irregular gap regions and voids at the interface, maximizing contact area while maintaining flexibility to accommodate volume changes during charging and discharging cycles.
2Quantity of substance
If a solid electrolyte layer is used in an all solid secondary battery, then energy density is improved, but charge/discharge characteristics are degraded due to poor contact between the anode and the solid electrolyte layer
Solution Approach 1:
The bonding layer acts as a mediator that improves the electrical contact between the anode and solid electrolyte layer. By filling the interface gaps with conductive carbon particles, it enables efficient charge transfer, thereby improving charge/discharge characteristics while preserving the high energy density benefits of the all-solid configuration.
Solution Approach 2:
The bonding layer is constructed as a composite material combining carbon particles (for electrical conductivity) and binder (for mechanical adhesion). This composite structure simultaneously addresses both electrical contact resistance and mechanical bonding requirements, enabling improved charge/discharge performance while maintaining the high energy density of the solid-state battery system.
3Object-affected harmful factors
If a bonding layer is added between the solid electrolyte layer and the anode, then interfacial contact is improved, but device complexity increases
Solution Approach 1:
The bonding layer is applied locally only at the critical interface region between the solid electrolyte layer and the anode, rather than throughout the entire battery structure. This localized approach improves interfacial contact where it is most needed while minimizing the overall structural complexity and material usage of the battery system.
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 proposed sub-assembly enhances high-rate characteristics and life characteristics of the battery by reducing interfacial resistance and maintaining a stable mechanical structure during repeated charging and discharging cycles.
Implementation Method 1
a bonding layer between the solid electrolyte layer and the carbon active material layer and in contact with a surface of the solid electrolyte layer
Data Source
AI summary
A sub-assembly for use in an all-solid secondary battery includes a solid electrolyte layer and an anode on the solid electrolyte layer. The anode includes a carbon active material layer between an anode current collector and the solid electrolyte layer, and a bonding layer between the solid electrolyte layer and the carbon active material layer and contacting a surface of the solid electrolyte layer. The bonding layer includes a plurality of carbon particles and a plurality of crystalline particles of a material having lithium (Li), carbon (C), and oxygen (O) atoms. An all-solid secondary batter includes a cathode and such a sub-assembly.