ZnO Coated Garnet Electrolyte for Lithium Metal Batteries
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Solution Overview
Problem
The development of solid state lithium metal batteries is hindered by high interfacial impedance due to poor wettability between garnet solid state electrolytes and lithium metal, leading to poor contact and increased resistance, which is exacerbated by the volume change of lithium during cycling and the flammability of organic liquid electrolytes.
Innovation Solution
A solid state electrolyte material with a 3D porous structure and a coating layer of ZnO is introduced, which increases the contact between the solid state electrolyte and lithium metal, reducing interfacial resistance and enhancing wettability, thereby improving the performance and safety of lithium metal batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If garnet solid state electrolyte is used, then non-flammability and dendrite blocking are achieved, but poor wettability with lithium metal results in high interfacial resistance
Solution Approach 1:
A thin coating layer of Al, Si, Ge, Ga, In, Sn, or Zn is applied to the surface of the garnet solid state electrolyte. This intermediate layer serves as a mediator that improves wettability with lithium metal anode, enabling better interfacial contact and reducing interfacial resistance while maintaining the underlying garnet's safety and dendrite blocking properties
Solution Approach 2:
The surface properties of the garnet electrolyte are modified by changing the chemical composition through coating application. The coating layer alters surface energy and chemical reactivity parameters, transforming the poor wettability state into a state with improved lithium metal infiltration and reduced interfacial resistance
2Quantity of substance
If lithium metal anode is used, then high energy density is achieved, but volume change during cycling exacerbates poor contact with solid state electrolyte
Solution Approach 1:
The coating layer is applied beforehand to the garnet electrolyte surface to create a buffer interface that can accommodate volume changes of the lithium metal anode during cycling. This pre-applied intermediate layer prevents direct mechanical stress between the expanding/contracting lithium and the rigid garnet, maintaining stable interfacial contact
Solution Approach 2:
A composite structure is formed by combining the garnet solid state electrolyte with a thin coating layer of reactive metal or metal oxide. This composite material structure integrates the high ionic conductivity and safety of garnet with the improved wettability and mechanical compliance of the coating layer, addressing both energy density and contact stability requirements
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 ZnO coating layer achieves a significant reduction in surface interface resistance, allowing for improved lithium infiltration and contact, enhancing the energy density and safety of lithium metal batteries by addressing the wettability issues and flammability concerns.
Implementation Method 1
The ZnO coating layer increases contact between the solid state electrolyte and lithium metal, reducing interfacial resistance and enhancing wettability
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
The present invention is directed to solid state electrolytes that comprise a coating layer. The present invention is also directed to methods of making the solid state electrolyte materials and methods of using the solid state electrolyte materials in batteries and other electrochemical technologies.