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Published on: March 7, 2018
Integrating Prelithiation and Interface Protection to Achieve High-Energy All-Solid-State Batteries
Xiangqun Xu1,2, Shiyong Chu1,2, Sheng Xu1,2
1College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and Frontiers Science, Center for Critical Earth Material Cycling, Nanjing University, Nanjing, 210023, China.
A novel Li$_{5}$FeO$_{4}$ (LFO) coating on Ni-rich cathodes enhances all-solid-state batteries (ASSBs) with Li-free anodes. This protective layer improves cycle life and energy density for safer, high-performance energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- All-solid-state batteries (ASSBs) with Li-free anodes offer high safety and energy density.
- Chemical-mechanical degradation limits cycle life in Li-free anode ASSBs due to lack of Li inventory.
- Ni-rich layered oxides are promising cathodes but prone to degradation with sulfide solid-state electrolytes (SSEs).
Purpose of the Study:
- To develop a protective coating for Ni-rich cathodes in Li-free anode ASSBs.
- To mitigate degradation issues caused by the interaction between Ni-rich cathodes and SSEs.
- To enhance the cycle life and energy density of Li-free anode ASSBs.
Main Methods:
- Coating Ni-rich layered oxide cathodes with Li$_{5}$FeO$_{4}$ (LFO) as a prelithiation agent.
- Fabricating Li-free anode ASSBs utilizing the LFO-coated cathode and sulfide SSE.
- Evaluating electrochemical performance, including reversible capacity, capacity retention, and energy density.
Main Results:
- The LFO coating effectively protects the Ni-rich cathode from reacting with the SSE.
- Reversible capacity increased from 174.7 to 199.7 mAh g$^{-1}$, and capacity retention improved from 33.8% to 84.8% after 100 cycles.
- An ultrahigh energy density of 440 Wh kg$^{-1}$ was achieved in a Li-free anode all-solid-state pouch cell.
Conclusions:
- The LFO-coated cathode significantly enhances the stability and performance of Li-free anode ASSBs.
- The protective LFO layer successfully prevents cathode structural degradation and SSE decomposition.
- This approach offers a viable strategy for developing high-energy and long-lasting Li-free anode ASSBs.
