All-Solid Battery Anode Layer for Uniform Lithium Deposition
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Solution Overview
Problem
Lithium-ion batteries with liquid electrolytes pose a risk of overheating and fire due to flammable solvents, and they suffer from internal resistance issues that deteriorate cycle characteristics, necessitating the development of an all-solid battery with improved safety and performance.
Innovation Solution
An all-solid secondary battery design featuring a cathode layer, an anode layer, and a solid electrolyte layer, where the anode layer includes a first and second carbonaceous anode active material layer with specific Raman spectrum intensity ratios to reduce defects and enhance lithium deposition uniformity, preventing short-circuits and improving cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid electrolyte is used in lithium-ion batteries, then the battery can operate with good ionic conductivity, but the risk of overheating and fire increases due to flammable organic solvents
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid, replacing flammable organic solvents with solid electrolyte materials. This fundamental parameter change eliminates the fire hazard while maintaining ionic conductivity necessary for battery operation.
Solution Approach 2:
The patent employs composite structures including carbonaceous materials with specific Raman spectrum characteristics (ID/G ratio between 0.9-1.1) combined with solid electrolytes. This composite approach optimizes both safety and electrochemical performance by selecting materials with complementary properties.
2Reliability
If internal resistance is reduced to improve cycle characteristics, then battery performance improves, but achieving low internal resistance in solid-state batteries is challenging due to interface contact issues
Solution Approach 1:
The patent applies local quality control by specifying that the carbonaceous anode material should have an ID/G ratio between 0.9 and 1.1 in the Raman spectrum, indicating optimized local structural properties. This local optimization of carbon structure enhances interface contact quality and reduces internal resistance at critical battery interfaces.
Solution Approach 2:
The patent changes the structural parameters of the carbonaceous material by controlling the ID/G ratio to fall within the specific range of 0.9-1.1. This parameter optimization improves the material's ability to form good interfacial contact with the solid electrolyte, thereby reducing internal resistance and improving cycle characteristics.
3Reliability
If uniform lithium deposition is achieved to prevent short-circuits, then battery safety and cycle life improve, but achieving uniform deposition requires precise control of anode material structure
Solution Approach 1:
The patent specifies local quality requirements for the carbonaceous anode material through the ID/G ratio parameter (0.9-1.1), which controls the local structural characteristics. This ensures uniform lithium deposition sites are created, preventing dendrite formation and short-circuits while maintaining manufacturability.
Data Source
AI summary
An all-solid secondary battery including: a cathode layer including a cathode active material layer; an anode layer; and a solid electrolyte layer including a solid electrolyte, wherein the solid electrolyte layer is disposed between the cathode layer and the anode layer, wherein the anode layer includes an anode current collector, a first anode active material layer in contact with the solid electrolyte layer, and a second anode active material layer disposed between the anode current collector and the first anode active material layer, wherein the first anode active material layer includes a first carbonaceous anode active material, and the second anode active material layer.