Solid-State Battery Insulation Layout for Dendrite Suppression
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Solution Overview
Problem
In all-solid batteries, lithium metal dendrite deposition is non-uniform due to current concentration, leading to reduced durability as the positive electrode and solid electrolyte layer migrate, affecting the battery's performance.
Innovation Solution
A solid-state battery design with a lithium metal layer and a solid electrolyte layer sequentially laminated, where an insulation member is placed between the lithium metal layer and the solid electrolyte layer, and at its corners, to prevent lithium metal dendrite deposition and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal layer is used in all-solid battery, then high energy density is achieved, but dendrite deposition occurs leading to reduced durability
Solution Approach 1:
An insulation member is introduced as an intermediary component between the lithium metal layer and the solid electrolyte layer. This insulation member prevents direct contact and suppresses dendrite formation by eliminating current concentration at the interface, thereby resolving the contradiction between maintaining high energy density from lithium metal and ensuring durability against dendrite-induced failure.
2Quantity of substance
If lithium metal layer is used in all-solid battery, then high capacity is achieved, but current concentration causes positive electrode and solid electrolyte layer migration
Solution Approach 1:
The insulation member serves as a mediator that prevents current concentration at the lithium metal-solid electrolyte interface. By blocking the direct electrical contact, it eliminates the driving force for material migration, thus preserving both the high lithium capacity and the compositional stability of the interface during charge-discharge cycles.
3Reliability
If insulation member is added to prevent dendrite deposition, then durability is improved, but device complexity increases
Solution Approach 1:
The insulation member is positioned only at the outer circumferential end of the lithium metal layer where dendrite formation is most critical. This targeted placement provides effective protection against dendrite-induced failure while minimizing the additional structural complexity, as the insulation member can be integrated into existing battery components or applied as a simple coating in the critical region.
Data Source
AI summary
A solid-state batter is provided which includes an electrode stack in which a solid electrolyte layer and positive electrode composite layer are sequentially laminated on a lithium metal layer, in which, when viewing the electrode stack from a top surface, an outer circumferential end of the lithium metal layer exists more to an inner side than an outer circumferential end of the solid electrolyte layer, and an insulation member extending from the solid electrolyte layer towards the lithium metal layer is disposed in a region between the outer circumferential end of the lithium metal layer and the outer circumferential end of the solid electrolyte layer.