阴极
石墨烯
材料科学
碘化锂
氧化物
电化学
锂(药物)
复合数
化学工程
制作
电池(电)
气凝胶
纳米技术
电极
复合材料
化学
冶金
内分泌学
病理
物理化学
功率(物理)
工程类
替代医学
物理
医学
电解质
量子力学
作者
Sang-Hyeon Kim,Sung Kon Kim,Peng Sun,Nuri Oh,Paul V. Braun
出处
期刊:Nano Letters
[American Chemical Society]
日期:2017-10-20
卷期号:17 (11): 6893-6899
被引量:66
标识
DOI:10.1021/acs.nanolett.7b03290
摘要
Li-iodine chemistry is of interest for electrochemical energy storage because it has been shown to provide both high power and high energy density. However, Li-iodine batteries are typically formed using Li metal and elemental iodine, which presents safety and fabrication challenges (e.g., the high vapor pressure of iodine). These disadvantages could be circumvented by using LiI as a starting cathode. Here, we present fabrication of a reduced graphene oxide (rGO)/LiI composite cathode, enabling for the first time the use of LiI as the Li-ion battery cathode. LiI was coated on rGO by infiltration of an ethanolic solution of LiI into a compressed rGO aerogel followed by drying. The free-standing rGO/LiI electrodes show stable long-term cycling and good rate performance with high specific capacity (200 mAh g-1 at 0.5 C after 100 cycles) and small hysteresis (0.056 V at 1 C). Shuttling was suppressed significantly. We speculate the improved electrochemical performance is due to strong interactions between the active materials and rGO, and the reduced ion and electron transport distances provided by the three-dimensional structured cathode.
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