More Like this

1. Carbon Additive-Free Crumpled Ti 3 C 2 T X MXene-Encapsulated Silicon Nanoparticle Anodes for Lithium-Ion Batteries

   https://doi.org/10.1021/acsaem.1c01736  

   Sarang, Kasturi ; Zhao, Xiaofei ; Holta, Dustin ; Cao, Huaixuan ; Arole, Kailash ; Flouda, Paraskevi ; Oh, Eun-Suok ; Radovic, Miladin ; Green, Micah J. ; Lutkenhaus, Jodie L. ( October 2021 , ACS Applied Energy Materials)
2. A mechanistic study of mesoporous TiO 2 nanoparticle negative electrode materials with varying crystallinity for lithium ion batteries

   https://doi.org/10.1039/c9ta12499c  

   Deng, Changjian ; Lau, Miu Lun ; Ma, Chunrong ; Skinner, Paige ; Liu, Yuzi ; Xu, Wenqian ; Zhou, Hua ; Zhang, Xianghui ; Wu, Di ; Yin, Yadong ; et al ( January 2020 , Journal of Materials Chemistry A)

   Nanoscale oxide-based negative electrodes are of great interest for lithium ion batteries due to their high energy density, power density and enhanced safety. In this work, we conducted a case study on mesoporous TiO 2 nanoparticle negative electrodes with uniform size and varying crystallinity in order to investigate the trend in the electrochemical properties of oxide-based nanoscale negative electrodes with varying crystallinity. Mesoporous solid spherical TiO 2 nanoparticles with a uniform particle size and varying crystallinity, i.e. , amorphous TiO 2 (A-TiO 2 ), partially crystalline TiO 2 (PC-TiO 2 ) and fully crystalline TiO 2 (FC-TiO 2 ) nanoparticles were studied. At low current rate (quasi steady-state), the specific capacity of the samples drops with the decrease of crystallinity. Ex situ synchrotron pair distribution function analysis reveals that the 1D zigzag Li ion diffusion pathway becomes expanded with the increase of crystallinity, which promotes ion mobility and charge storage. At high current rates (away from equilibrium states), however, the A-TiO 2 sample demonstrates slightly larger capacity than the FC-TiO 2 sample, both of which show larger capacities than that of the PC-TiO 2 sample. Both A-TiO 2 and FC-TiO 2 samples exhibit higher capacitive contribution to the charge storage and larger Li + diffusivity than those of the PC-TiO 2 sample, which explains their better rate capability. Moreover, the larger Li + diffusivity of the A-TiO 2 sample leads to the slightly larger specific capacity than the FC-TiO 2 sample at the highest current rate. 

   more » « less
3. Leveraging Nanoparticle Dispersion State To Tune Vanadium Ion Selectivity of Nanophase-Segregated Ionomer Nanocomposites for Redox Flow Batteries

   https://doi.org/10.1021/acsaem.9b01443  

   Domhoff, Allison ; Balwani, Apoorv ; Martin, Tyler B. ; Davis, Eric M. ( December 2019 , ACS Applied Energy Materials)
4. Communication—Deconvoluting the Conductivity Enhancement due to Nanoparticle Fillers in PVdF-Based Polymer Electrolytes for Li-Metal Batteries

   https://doi.org/10.1149/1945-7111/abe168  

   Deivanayagam, Ramasubramonian ; Shahbazian-Yassar, Reza ( February 2021 , Journal of The Electrochemical Society)

   null (Ed.)
5. Ferromagnetic Nanoparticle–Assisted Polysulfide Trapping for Enhanced Lithium–Sulfur Batteries

   https://doi.org/10.1002/adfm.201800563  

   Gao, Zan ; Schwab, Yosyp ; Zhang, Yunya ; Song, Ningning ; Li, Xiaodong ( April 2018 , Advanced Functional Materials)

   The lithium–sulfur (Li–S) battery is a promising candidate for next‐generation high‐density energy storage devices because of its ultrahigh theoretical energy density and the natural abundance of sulfur. However, the practical performance of the sulfur cathode is plagued by fast capacity decay and poor cycle life, both of which can be attributed to the intrinsic dissolution/shuttling of lithium polysulfides. Here, a new built‐in magnetic field–enhanced polysulfide trapping mechanism is discovered by introducing ferromagnetic iron/iron carbide (Fe/Fe₃C) nanoparticles with a graphene shell (Fe/Fe₃C/graphene) onto a flexible activated cotton textile (ACT) fiber to prepare the ACT@Fe/Fe₃C/graphene sulfur host. The novel trapping mechanism is demonstrated by significant differences in the diffusion behavior of polysulfides in a custom‐designed liquid cell compared to a pure ACT/S cathode. Furthermore, a cell assembled using the ACT@Fe/Fe₃C/S cathode exhibits a high initial discharge capacity of ≈764 mAh g⁻¹, excellent rate performance, and a remarkably long lifespan of 600 cycles using ACT@Fe/Fe₃C/S (whereas only 100 cycles can be achieved using pure ACT/S). The new magnetic field–enhanced trapping mechanism provides not only novel insight but unveils new possibilities for mitigating the “shuttle effect” of polysulfides thereby promoting the practical applications of Li–S batteries.

    

   more » « less