All-Solid-State Battery Design for Enhanced Safety and Cycle Life
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Summary
Problems
All-solid-state secondary batteries face issues with short circuits and degraded cycle characteristics due to lithium deposition at the solid electrolyte-anode interface and increased interfacial resistance, which affects their safety and performance.
Innovation solutions
The battery design includes a cathode, an anode with a first anode active material layer containing M1-M2-Ox composites or Li-M1-M2-Ox composites, and a second anode active material layer with a carbon-containing or metallic anode active material, along with a porous structure to enhance lithium diffusion and interfacial stability.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a lithium metal anode is used to achieve high capacity, then the battery capacity increases, but lithium dendrite formation occurs causing safety issues and poor cycle stability
Why choose this principle:
The anode is divided into multiple layers including a protection layer, alloy anode layer, and carbon anode layer. This segmentation prevents lithium dendrite formation by distributing lithium deposition across different material phases while maintaining high capacity through the alloy layer's high theoretical capacity.
Principle concept:
If a lithium metal anode is used to achieve high capacity, then the battery capacity increases, but lithium dendrite formation occurs causing safety issues and poor cycle stability
Why choose this principle:
A protection layer is formed on the lithium metal surface before battery assembly to prevent dendrite formation and electrolyte decomposition. This preliminary protective action ensures long-term cycle stability while preserving the high capacity of the lithium metal anode.
Application Domain
Data Source
AI summary:
The battery design includes a cathode, an anode with a first anode active material layer containing M1-M2-Ox composites or Li-M1-M2-Ox composites, and a second anode active material layer with a carbon-containing or metallic anode active material, along with a porous structure to enhance lithium diffusion and interfacial stability.
Abstract
An all-solid-state battery including a cathode including a cathode active material; an anode including an anode current collector, a first anode active material layer, and a second anode active material layer; and a solid electrolyte arranged between the cathode and the anode, wherein the first anode active material layer is arranged adjacent to the solid electrolyte and comprises M1-M2Ox, Li-M1-M2Ox, or a combination thereof, wherein the first metal M1 and the second metal M2 are each independently at least one element that reacts with lithium to form a lithium alloy or compound, x>0, the second anode active material layer is arranged between the anode current collector and the first anode active material layer and includes a second anode active material, and the second anode active material includes a carbon-containing anode active material, or a carbon-containing anode active material, and at least one of a metallic or metalloid anode active material.