Layered Solid-State Lithium Battery for Dendrite Suppression
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Solution Overview
Problem
Lithium metal batteries face issues with non-uniform electrodeposition leading to dendrite formation, which causes battery deterioration, short circuits, and reduced performance due to interfacial resistance and lithium reactivity.
Innovation Solution
A layered all-solid-state battery cell design featuring a lithium metal anode layer, an anode protective layer, multiple electrolyte layers with varying compositions and thicknesses, and a cathode layer, which includes carbon nanotubes for improved ionic conductivity and mechanical strength, reducing dendrite growth and enhancing ion transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal anode is used to achieve high energy density, then energy density is improved, but dendrite formation occurs leading to battery deterioration and short circuits
Solution Approach 1:
A protective layer comprising metal particles (such as aluminum, magnesium, or their alloys) is introduced as an intermediary between the lithium metal anode and the solid electrolyte. This protective layer prevents direct contact and reaction between lithium metal and the solid electrolyte, suppressing dendrite formation and interface degradation, thereby maintaining both high energy density and battery reliability
Solution Approach 2:
The anode structure is designed as a composite system with multiple layers: lithium metal anode layer, protective metal particle layer, and solid electrolyte layer. This composite structure combines the high capacity of lithium metal with the protective function of metal particles and the ionic conductivity of solid electrolyte, resolving the contradiction between energy density and stability
2Object-affected harmful factors
If solid electrolyte is used to eliminate flammability issues, then safety is improved, but interfacial resistance increases reducing electrochemical performance
Solution Approach 1:
The protective layer comprising metal particles serves as a mediator that improves interfacial contact between the lithium metal anode and solid electrolyte. This intermediate layer reduces interfacial resistance by filling gaps and enhancing contact area, while maintaining the non-flammable property of the solid electrolyte system
Solution Approach 2:
The protective layer modifies the physical and chemical parameters at the interface, including surface roughness, contact area, and ionic conductivity. By changing these interfacial parameters, the system achieves both safety (non-flammability) and good electrochemical performance (low interfacial resistance)
3Duration of action of moving object
If lithium is continuously deposited and removed during operation, then battery cycling is enabled, but non-uniform deposition forms dendrites causing battery deterioration
Solution Approach 1:
The protective metal particle layer acts as a mediator that promotes uniform lithium deposition during cycling. This intermediate layer provides a stable surface for lithium ion insertion and extraction, preventing non-uniform deposition and dendrite formation, thereby enabling long-term cycling with maintained durability
Solution Approach 2:
The protective layer is formed beforehand on the lithium metal anode surface before cycling begins. This preliminary protective structure prevents subsequent non-uniform lithium deposition and dendrite formation during repeated charge-discharge cycles, ensuring both cycling capability and battery durability
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 layered design provides improved mechanical strength, reduced resistance, and enhanced ionic conductivity, resulting in higher energy density, longer driving range, and shorter charging times for solid-state batteries.
Implementation Method 1
another layer configured to provide mechanical strength to the battery cell as well as improved ionic diffusion
Implementation Method 2
an anode protective layer in contact with the lithium metal anode layer, the anode protective layer comprising at least one metal
Data Source
AI summary
An all-solid-state battery cell has a lithium metal anode layer, an anode protective layer in contact with the lithium metal anode layer, the anode protective layer comprising at least one metal, a first electrolyte layer in contact with the anode protective layer, a second electrolyte layer, an electrolyte interlayer comprising carbon and binder, the electrolyte interlayer positioned directly between the first electrolyte layer and the second electrolyte layer, and a cathode layer in contact with the second electrolyte layer.