Porous Lithium Metal Anode Structure for Dendrite Suppression
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Solution Overview
Problem
Lithium metal batteries suffer from poor cycle characteristics due to the formation of lithium dendrites and electrolyte consumption during charging and discharging, leading to short circuits and rapid deterioration.
Innovation Solution
A lithium metal battery design featuring an anode with a porous layer structure, including regions exposed and inserted into the anode active material layer, which inhibits dendrite formation and electrolyte consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium metal is used as an anode active material to achieve high theoretical electric capacity, then the electric capacity is improved, but dendrites form and grow on the surface causing short circuits and deteriorating lifespan characteristics
Solution Approach 1:
A porous layer is disposed on the anode active material layer to provide a controlled porous structure that prevents dendrite formation while maintaining high electric capacity. The porous structure allows lithium ion transport while physically constraining dendrite growth.
Solution Approach 2:
The anode is constructed as a composite structure combining anode active material layer with a porous layer, creating a multi-layer composite that simultaneously achieves high capacity and improved lifespan by separating the functions of lithium storage and dendrite prevention.
2Quantity of substance
If lithium metal is used as an anode active material, then high theoretical electric capacity is achieved, but electrolyte consumption increases during charging and discharging processes
Solution Approach 1:
The porous layer reduces electrolyte consumption by providing a controlled interface between the electrolyte and anode active material, limiting unnecessary electrolyte decomposition reactions while maintaining ion transport efficiency.
3Stability of the object's composition
If carbonaceous anode active materials such as graphite are used, then high stability is achieved due to no volume change during charging and discharging, but the theoretical electric capacity is limited to approximately 372 mAh/g
Solution Approach 1:
The invention creates a composite anode structure that combines carbonaceous materials with a porous layer, achieving both the high stability of carbonaceous materials and the enhanced capacity benefits of lithium metal without the dendrite formation problems.
Data Source
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AI summary
Provided are a lithium metal battery and a method for manufacturing an anode included therein, the lithium metal battery comprising a cathode, an anode, and an electrolyte disposed between the cathode and the anode, wherein the anode includes an anode current collector, an anode active material layer disposed on the anode current collector, and a porous layer including a porous structure, the porous layer includes a first region exposed on the anode active material layer, and a second region inserted into the anode active material layer, and the anode active material layer includes a second region into which the porous layer is inserted, and a third region into which the porous layer is not inserted.