Multilayer Lithium Storage Layer for Uniform Anodeless Deposition
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Solution Overview
Problem
Conventional all-solid-state batteries have low energy density due to high specific gravity of solid electrolytes and face challenges with lithium metal anodes, including interfacial bonding issues, dendrite growth, and poor durability in anodeless configurations.
Innovation Solution
An anodeless all-solid-state battery design with a lithium storage layer having a high-porosity second layer at the anode-current-collector side and a low-porosity first layer at the electrolyte side, utilizing a multilayer structure with enhanced binder content in the interface portion to improve adhesion and uniform lithium deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium metal is used as the anode to increase energy density, then energy density is improved, but interfacial bonding issues and dendrite growth occur
Solution Approach 1:
The patent introduces a lithium storage layer as an intermediary between the solid electrolyte and the anode current collector. This layer contains lithium compounds (such as Li3PO4, Li2SiO3, or Li4SiO4) dispersed in a porous structure, which serves as a buffer zone that prevents direct contact between lithium metal and the solid electrolyte, thereby avoiding interfacial bonding issues and dendrite growth while maintaining high energy density
Solution Approach 2:
The lithium storage layer is designed with a porous structure having controlled porosity (30-70%), which provides ample surface area for lithium deposition and accommodation. The porous structure allows uniform lithium distribution during cycling, preventing dendrite formation while maintaining electrical conductivity and ionic transport pathways
2Device complexity
If solid electrolyte is used in all-solid-state battery, then battery structure is simplified, but specific gravity is high leading to low energy density
Solution Approach 1:
The patent applies local quality by creating a lithium storage layer with specific local properties (porosity, lithium compound concentration, binder content) between the solid electrolyte and current collector. This localized modification allows the solid electrolyte to maintain its structural simplicity while the lithium storage layer compensates for the high specific gravity issue by providing additional lithium reservoir capacity
Solution Approach 2:
The lithium storage layer is constructed as a composite material system combining lithium compounds (Li3PO4, Li2SiO3, Li4SiO4), conductive carbon materials (acetylene black, carbon nanotubes), and binder polymers (PVDF, CMC). This composite structure optimizes the balance between ionic conductivity, electrical conductivity, mechanical strength, and lithium storage capacity, thereby improving energy density while maintaining the simplified all-solid-state battery structure
3Device complexity
If anodeless configuration is used to simplify battery structure, then device complexity is reduced, but lithium precipitation is non-uniform leading to poor durability
Solution Approach 1:
The lithium storage layer is prepared in advance with a controlled porous structure and lithium compound distribution before battery assembly. This preliminary structuring ensures that lithium ions have predefined pathways and deposition sites, promoting uniform lithium precipitation during initial charging cycles and preventing the formation of dead lithium and capacity fade, thereby improving durability while maintaining the simplified anodeless configuration
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 design enables uniform lithium deposition, suppresses volume expansion, and enhances durability and charge/discharge efficiency by improving adhesion between layers.
Implementation Method 1
the anode composite layer of an all-solid-state battery is formed by mixing an active material and a solid electrolyte to provide ionic conductivity
Implementation Method 2
enhancing adhesion between layers of a lithium storage layer
Data Source
AI summary
An all-solid-state battery includes: an anode current collector; a lithium storage layer including a first layer located at an electrolyte-layer side and a second layer located at an anode current collector side, having a higher porosity than the first layer, and including an interface portion and a core portion, which is a remaining portion other than the interface portion; an electrolyte layer; and a cathode layer, wherein the anode current collector, the lithium storage layer, the electrolyte layer, and the cathode layer are sequentially laminated, and the interface portion is in contact with the first layer and has a higher binder content per unit volume than the core portion.