Anodeless Coating Layer for All-Solid-State Battery Dendrite Control
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Solution Overview
Problem
Lithium dendrite growth in all-solid batteries leads to short circuits and capacity deterioration, limiting the practical use of lithium as an anode active material due to existing methods' inability to effectively suppress deposition and growth.
Innovation Solution
An anodeless coating layer is introduced, comprising an anode active material capable of forming alloys or compounds with lithium, and a conductive binder, such as a block copolymer with ion-conductive and electron-conductive domains, which stabilizes the lithium metal layer and suppresses dendrite growth by facilitating lithium ion conductivity and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium is used as anode active material to increase energy density, then energy density is improved, but lithium dendrite growth causes short circuit and capacity deterioration
Solution Approach 1:
A coating layer comprising a block copolymer with conductive domains is introduced as an intermediary between the lithium anode and the electrolyte. This coating layer mediates the interaction by providing a controlled interface that facilitates lithium ion transport while preventing direct contact between lithium dendrites and the electrolyte, thereby resolving the contradiction between high energy density and battery reliability
Solution Approach 2:
The coating layer is formed using a composite material system consisting of a block copolymer with distinct conductive and non-conductive domains. This composite structure combines the benefits of high conductivity regions for ion transport with insulating regions for dendrite suppression, enabling simultaneous achievement of high energy density and reliable operation
2Reliability
If conventional methods are used to suppress lithium dendrite deposition, then dendrite growth is reduced, but battery characteristics and performance remain insufficient
Solution Approach 1:
The block copolymer coating layer exhibits local quality differentiation with conductive domains that facilitate lithium ion transport and non-conductive domains that suppress dendrite growth. This spatially differentiated structure allows the coating to perform multiple functions simultaneously, achieving both dendrite suppression and maintained battery performance without compromise
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 anodeless coating layer enhances lithium ion conductivity, improves battery lifespan, and prevents short circuits by acting as a protective layer for the lithium metal layer, thereby increasing energy density and maintaining battery capacity.
Implementation Method 1
the conductive domain includes an ion-conductive domain, an electron-conductive domain, or a combination thereof
Implementation Method 2
an anode active material capable of forming an alloy with lithium or a compound with lithium
Data Source
AI summary
An anodeless coating layer for an all-solid battery, the anodeless coating layer includes: an anode active material capable of forming an alloy with lithium or a compound with lithium; and a binder, wherein the binder includes a block copolymer including a conductive domain, a non-conductive domain, or a combination thereof, and wherein the conductive domain includes an ion-conductive domain, an electron-conductive domain, or a combination thereof.