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Published on: March 7, 2018
Improving the Cycling Stability of Li Anode in All-Solid-State Lithium Batteries with Li-Ga Anodic Interlayer
Jie Lu1, Guoyong Xue1, Chenji Hu1
1School of Chemistry and Chemical Engineering, In Situ Center for Physical Sciences, Shanghai Electrochemical Energy Device Research Center (SEED), State Key Laboratory of Metal Matrix Composites, and Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
A new Li-Ga alloy interlayer effectively suppresses lithium dendrite growth in all-solid-state lithium batteries (ASSLBs). This strategy enhances lithium diffusion kinetics, leading to improved cycling stability and performance for next-generation batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Commercialization of lithium metal anodes in all-solid-state lithium batteries (ASSLBs) is challenging due to lithium dendrite growth and uneven deposition.
- Stabilizing the anode-solid-state electrolyte interface is crucial for safe and efficient ASSLB operation.
Purpose of the Study:
- To develop a practical interfacial engineering strategy to overcome limitations in ASSLB performance.
- To suppress lithium dendrite formation and enhance lithium ion diffusion kinetics at the anode.
Main Methods:
- A facile metal displacement strategy was employed to create a lithium-gallium (Li-Ga) alloy anodic interlayer.
- The Li-Ga alloy modified lithium (Li-Ga@Li) anode was characterized for its structural and electrochemical properties.
- Symmetric cells and ASSLBs with a high-loading NCM811 cathode were assembled and tested for cycling stability and rate capability.
Main Results:
- The Li-Ga alloy interlayer significantly suppressed lithium dendrite growth and stabilized the anode-solid-state electrolyte interface.
- The Li-Ga@Li anode exhibited a doubled lithium atomic diffusion coefficient compared to pristine lithium metal.
- Symmetric cells demonstrated stable lithium stripping/plating for over 800 hours with reduced polarization and increased critical current density.
- ASSLBs utilizing the Li-Ga@Li anode showed enhanced rate capability and prolonged cycling stability with a NCM811 cathode.
Conclusions:
- The Li-Ga alloy interlayer is an effective strategy for improving interfacial stability and lithium diffusion in ASSLBs.
- This approach offers a practical route toward high-performance and reliable all-solid-state lithium batteries.
- The enhanced diffusivity via interfacial engineering is key to advancing ASSLB technology.
