材料科学
电解质
快离子导体
石墨烯
阳极
阴极
电池(电)
化学工程
电化学
电极
陶瓷
纳米技术
复合材料
电气工程
化学
量子力学
物理
工程类
物理化学
功率(物理)
作者
Edward Matios,Huan Wang,Chuanlong Wang,Xiaofei Hu,Xuan Lu,Jianmin Luo,Weiyang Li
标识
DOI:10.1021/acsami.8b19519
摘要
Employing solid ceramic electrolyte in sodium (Na) metal batteries enables safe and cost-effective energy storage solution toward the advent of sustainable energy. Nevertheless, the development of solid-state Na batteries is hindered by the large interfacial charge transfer resistance between electrodes and solid electrolyte. Here, a novel and scalable design approach is utilized to significantly reduce the interfacial resistance through the direct growth of graphene-like interlayer on Na+ superionic conductor (NASICON) ceramic electrolyte, resulting in a 10-fold decrease of interfacial resistance. Benefiting from the graphene regulated NASICON, extremely stable Na plating/stripping cycling performance using solid electrolyte at a current density up to 1 mA/cm2 with a cycling capacity of 1 mAh/cm2 for 500 cycles (1000 h) is demonstrated for the first time. The surface of Na electrode after 1000 h of cycling remained smooth because of uniform Na+ flux across graphene-coated-NASICON/Na interface enabled by the abundant graphene defects network for efficient Na+ transport. Solid-state room temperature battery consists of graphene-regulated NASICON electrolyte, Na3V2(PO4)3 cathode and Na anode delivered a reversible initial capacity of 108 mAh/g at 1C current density for 300 cycles with 85% capacity retention, far superior than the battery with pristine NASICON. This work can be a valuable contribution toward a safe and stable solid-state Na metal battery system, and provide insights for solid-state lithium metal batteries as well.
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