Composite Anode Interface for Uniform Lithium Deposition
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Solution Overview
Problem
Existing anodeless all-solid-state batteries face challenges in achieving uniform lithium deposition and reversible operation due to the absence of an anode active material, leading to inefficiencies and potential short circuits.
Innovation Solution
Incorporating a composite structure layer with a carbon layer and a metal deposition layer containing lithiophilic metals on the anode current collector, which enhances physical contact and uniform lithium deposition by filling voids between the solid electrolyte and the anode current collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the anode active material layer is simply removed and only the anode current collector is applied, then the energy density per weight can be greatly increased, but lithium may not be uniformly deposited and the battery is not reversibly driven
Solution Approach 1:
A composite structure layer comprising a carbon layer and a metal deposition layer is introduced as an intermediary between the anode current collector and the solid electrolyte. This intermediate layer serves as a mediator that facilitates uniform lithium ion deposition and extraction, enabling reversible battery operation while maintaining the anodeless configuration for high energy density
Solution Approach 2:
The composite structure layer combines multiple materials (carbon material and lithiophilic metal) with different properties to achieve both uniform lithium deposition and structural stability. The carbon layer provides a conductive matrix while the metal deposition layer enhances lithium affinity, creating a synergistic composite that resolves the contradiction between simple configuration and reversible operation
2Ease of manufacture
If the anode active material layer is simply removed and only the anode current collector is applied, then the manufacturing process becomes simpler, but lithium deposition uniformity deteriorates
Solution Approach 1:
The anode structure is segmented into distinct functional layers: a carbon layer for electrical conductivity and a metal deposition layer for enhanced lithium affinity. This segmentation allows each layer to perform its specific function optimally, ensuring uniform lithium deposition while maintaining a relatively simple manufacturing process compared to traditional anode structures
Solution Approach 2:
Different regions of the anode structure are assigned different properties: the carbon layer provides a conductive network while the metal deposition layer provides high lithium affinity. This local differentiation of material properties ensures uniform lithium deposition across the electrode surface while keeping the overall manufacturing process straightforward
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 solution improves cycle efficiency and reversibility by minimizing irreversible capacity and suppressing lithium dendrite growth, enabling stable operation at room temperature.
Implementation Method 1
forming a composite structure layer on an anode current collector by applying a metal deposition layer containing a lithiophilic metal on the carbon layer
Data Source
AI summary
An anodeless all-solid-state battery includes an anode current collector, a composite structure layer positioned on the anode current collector, a solid electrolyte positioned on the composite structure layer, and a cathode positioned on the solid electrolyte, in which the composite structure layer includes a carbon layer including a carbon material, and a metal deposition layer positioned on the carbon layer and including lithiophilic metal particles.