材料科学
阴极
聚丙烯腈
电池(电)
阳极
双功能
锂(药物)
电极
金属锂
化学工程
复合材料
聚合物
化学
物理化学
催化作用
有机化学
功率(物理)
内分泌学
工程类
物理
医学
量子力学
作者
Viet Hung Pham,J. Anibal Boscoboinik,Darı́o Stacchiola,Ethan C. Self,Manikandan Palanisamy,Sudhan Nagarajan,Yixian Wang,Vilas G. Pol,Jagjit Nanda,Eunsu Paek,David Mitlin
标识
DOI:10.1016/j.ensm.2019.04.021
摘要
We report a bifunctional sodium metal battery (SMB) and lithium metal battery (LMB) cathode based on 63 wt.%SeS covalently bonded to a co-pyrolyzed polyacrylonitrile (PAN) host, termed “SeSPAN”. This dense, low surface area, fully-amorphous electrode offers a highly favorable combination of reversible capacity, rate capability, and cycling life: At a fast charging rate of 1 A g−1, the reversible capacities with Na and Li are 632 and 749 mAh g−1 (based on active SeS), with cycle 1 CE of 81% in both cases. At an ultra-fast charging rate of 4 A g−1 (∼5C) the reversible capacities with Na and Li are 453 and 604 mAh g−1. Li-SeSPAN degrades 3% at cycle 500, while with Na-SeSPAN degrades by 17% after 150 cycles at 0.5 A g−1. Both Na and Li cells display a uniquely low voltage hysteresis (210 and 200 mV at a current density of 0.2 A g−1), indicative of facile charge-discharge kinetics. Analysis of the post-cycled anodes shows negligible S or Se crossover, with neither species being detected in the Li-SEI after extended cycling.
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