锂钴氧化物
X射线光电子能谱
电解质
锂(药物)
瓜尔胶
电极
材料科学
电化学
化学工程
阴极
锂离子电池
法拉第效率
电池(电)
无机化学
化学
工程类
内分泌学
物理化学
功率(物理)
物理
医学
量子力学
生物化学
作者
Diogo Vieira Carvalho,Nicholas Loeffler,Maral Hekmatfar,Arianna Moretti,Guk‐Tae Kim,Stefano Passerini
标识
DOI:10.1016/j.electacta.2018.01.083
摘要
Herein we report the investigation on the use of guar gum and two of its derivatives as LIB positive electrodes binders. These polymers are electrochemically stable within the operating voltage of LIBs (0.01–5 V vs Li/Li+) and do not show evidence of thermal decomposition up to 200 °C. The electrochemical performance of lithium nickel manganese cobalt oxide (NMC) electrodes made using guar gum is excellent as indicated, for instance, by the delivered capacity of 100 mAh g−1 upon 5C rate cycling. X-ray Photoelectron Spectroscopy (XPS) measurements of pristine electrodes reveal as the binder layer surrounding the active material particles is thin, resulting in the above-mentioned electrochemical performance. Full lithium-ion cells, utilizing guar gum on both positive and negative electrodes, display a stable discharge capacity of ∼110 mAh g−1 (based on cathode active material) with high coulombic efficiencies. Post-mortem investigation by XPS of cycled graphite electrodes from full lithium-ion cells revealed the formation of a thin solid electrolyte interface (SEI).
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