Publications by authors named "Bohua Wen"
Thin and flexible solid-state electrolyte (SSE) films with high ionic conductivity and low interfacial resistance are urgently required for lithium metal batteries (LMBs). However, it's still challenging to reduce the film thickness to <20 µm, especially for those with high ceramic contents. Herein, a facile slurry casting method is developed to prepare the ultra-thin (14 µm) LiZrSiPO (LZSP) films with ceramic content up to 91% using a composite polymer binder, polyvinylidene fluoride (PVDF), and polyethylene oxide (PEO).
View Article and Find Full Text PDFLithium-rich layered oxides (LLOs) are concerned as promising cathode materials for next-generation lithium-ion batteries due to their high reversible capacities (larger than 250 mA h g ). However, LLOs suffer from critical drawbacks, such as irreversible oxygen release, structural degradation, and poor reaction kinetics, which hinder their commercialization. Herein, the local electronic structure is tuned to improve the capacity energy density retention and rate performance of LLOs via gradient Ta doping.
View Article and Find Full Text PDFDesign principles for self-forming interfaces enabling stable lithium-metal anodes.
Proc Natl Acad Sci U S A
November 2020
Article Synopsis
- Researchers are focusing on thin lithium-metal anodes (<50 µm) to enhance Li-ion batteries, but face challenges with dendrite formation and low coulombic efficiency (CE).
- Previous studies indicate that the solid-electrolyte interface (SEI) significantly influences lithium deposition behavior; however, optimal design rules for SEIs are still unclear.
- This study identifies key factors for creating effective SEIs—specifically the fraction of ionic compounds and compactness—leading to improved performance and demonstrating one of the longest cycle lives (350 cycles with 80% capacity retention) in high-specific-energy lithium batteries.