Publications by authors named "Xiangxin Cheng"
Surface-Confined Disordered Hydrogen Bonds Enable Efficient Lithium Transport in All-Solid-State PEO-Based Lithium Battery.
Angew Chem Int Ed Engl
March 2025
Polyethylene oxide (PEO)-based electrolytes are essential to advance all-solid-state lithium batteries (ASSLBs) with high safety/energy density due to their inherent flexibility and scalability. However, the inefficient Li transport in PEO often leads to poor rate performance and diminished stability of the ASSLBs. The regulation of intermolecular H-bonds is regarded as one of the most effective approaches to enable efficient Li transport, while the practical performances are hindered by the electrochemical instability of free H-bond donors and the constrained mobility of highly ordered H-bonding structures.
View Article and Find Full Text PDFProlonged engagement in tasks with varying attention demands is thought to elicit distinct forms of mental fatigue, potentially indicating variations in neural activity. This study aimed to investigate the association between mental fatigue and changes in electroencephalogram microstate dynamics during tasks with varying attention demands.In the present study, we employed a 2 × 2 repeated measures ANOVA to analyze the temporal parameters of four distinct microstates (A, B, C, and D) across different levels of attention demands (high vs.
View Article and Find Full Text PDFArticle Synopsis
- Achieving both high-energy-density and high-power-density in power batteries is challenging, but this study uses atomic layer deposition (ALD) and thermal treatments to create an innovative protective coating on commercial LiNiCoMnO (NCM523) cathodes.
- The new coating, which features dual conduction, prevents unwanted reactions and promotes lithium transport, enhancing stability and performance at high voltages.
- The modified battery, Al@EIC-NCM523, shows impressive results with a capacity of 114.7 mAh/g at high rates and retains 74.72% of its capacity after 800 charge cycles, indicating potential for future lithium-ion battery advancements.
Scalable Precise Nanofilm Coating and Gradient Al Doping Enable Stable Battery Cycling of LiCoO at 4.7 V.
Angew Chem Int Ed Engl
August 2024
Article Synopsis
- The development of high-voltage Lithium Cobalt Oxide (LiCoO or LCO) materials is crucial for improving energy densities in smart electronics, but faces challenges, including interface degradation and structural collapse at 4.7 V.
- A novel approach combining an ultra-thin LiAlO coating and gradient aluminum doping addresses these issues by enhancing Li migration and electrochemical stability while reducing side reactions.
- The modified LCO shows significant improvements, achieving a reversible capacity of 230 mAh/g at 4.7 V and excellent cycling stability, making it a promising candidate for high-energy-density electrode materials.