Lithium Solid Battery Li Storing Layer Dendrite Prevention
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Solution Overview
Problem
Lithium solid batteries face challenges in coulomb efficiency due to dendrite growth, which affects the battery's performance and safety, particularly when the anode includes multiple layers.
Innovation Solution
Incorporating a Li storing layer between the anode current collector and the solid electrolyte layer with a specific amount of Li storage capacity and thickness, optimized to prevent dendrite growth, using carbon materials like KETJENBLACK and a binder such as PVDF, and ensuring the Li ion conductivity is lower than the solid electrolyte layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Li storing layer is added between the anode current collector and solid electrolyte layer to prevent dendrite growth, then reliability is improved, but device complexity increases
Solution Approach 1:
A Li storing layer is introduced as an intermediary component between the anode current collector and the solid electrolyte layer. This intermediate layer serves as a buffer zone that accommodates lithium deposition and prevents direct contact between the solid electrolyte and current collector, thereby inhibiting dendrite growth while maintaining structural simplicity
Solution Approach 2:
The thickness of the Li storing layer is optimized to specific ranges (5-50 μm in some embodiments, 10-30 μm in others) to achieve the optimal balance between dendrite prevention and coulomb efficiency. By controlling this critical parameter, the system prevents dendrite formation without excessive complexity
2Reliability
If the Li storing layer thickness is increased to improve dendrite inhibition, then reliability is improved, but coulomb efficiency deteriorates
Solution Approach 1:
The thickness of the Li storing layer is precisely controlled within optimal ranges (5-50 μm, preferably 10-30 μm) to achieve the right balance. This parameter optimization ensures the layer is thick enough to inhibit dendrite growth effectively while remaining thin enough to maintain good coulomb efficiency and minimize energy loss
Solution Approach 2:
Rather than making the Li storing layer excessively thick for maximum dendrite protection, the invention uses a partially optimized thickness that provides sufficient dendrite inhibition while avoiding the excessive action that would lead to poor coulomb efficiency. This partial action approach achieves adequate protection without the negative consequences of over-engineering
3Reliability
If the amount of Li storage in the Li storing layer is increased to improve dendrite prevention, then reliability is improved, but the battery capacity is reduced
Solution Approach 1:
The amount of Li storage in the Li storing layer is optimized to specific ranges (0.05-0.50 mAh/cm², preferably 0.10-0.30 mAh/cm²) to achieve the optimal balance between dendrite prevention and maintaining battery capacity. This parameter control ensures sufficient lithium is stored for dendrite inhibition while preserving overall battery performance
Solution Approach 2:
The Li storing layer contains a partial amount of lithium storage rather than excessive lithium. This partial action provides sufficient lithium for dendrite prevention purposes without over-storing lithium that would unnecessarily reduce the battery's overall capacity and energy density
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
This configuration enhances the coulomb efficiency of the battery by inhibiting dendrite growth and improving the reversibility of lithium deposition and dissolution, leading to increased discharge capacity and reduced self-discharge.
Implementation Method 1
a Li storing layer between the anode current collector and the solid electrolyte layer; an amount of Li storage of the Li storing layer to a cathode charging capacity
Implementation Method 2
a solid electrolyte layer... a Li ion conductivity of the Li storing layer is preferably lower than a Li ion conductivity of the solid electrolyte layer
Implementation Method 3
the Li storing layer may comprise a carbon material. the carbon material is preferably KETJENBLACK, an electro-conductive carbon black
Data Source
AI summary
A main object of the present disclosure is to provide a lithium solid battery in which the coulomb efficiency of the battery upon deposition and dissolution of a metal lithium is improved. The above object is achieved by providing a lithium solid battery comprising: an anode current collector, a solid electrolyte layer, a cathode active material layer, and a cathode current collector; wherein the lithium solid battery comprises a Li storing layer between the anode current collector and the solid electrolyte layer; an amount of Li storage of the Li storing layer to a cathode charging capacity is 0.13 or more; and a thickness of the Li storing layer is 83 μm or less.