Evaluation of guar gum-based biopolymers as binders for lithium-ion batteries electrodes
Evaluation of guar gum-based biopolymers as binders for lithium-ion batteries electrodes
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DOI：
10.1016/j.electacta.2018.01.083
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发表时间：
2018-03-01
影响因子：
6.6
通讯作者：
Passerini, Stefano
中科院分区：
文献类型：
--
作者：
Carvalho, Diogo Vieira;Loeffler, Nicholas;Passerini, Stefano
本文报道了用瓜尔胶及其两种衍生物作为锂离子电池正极粘合剂的研究。这些聚合物在LiBS的工作电压下(0.01-5V vs Li/Li+)电化学稳定，在200℃以下没有热分解迹象。使用瓜尔豆胶制成的锂镍锰钴氧化物(NMC)电极具有优异的电化学性能，例如，5C倍率循环下的放电容量为100mAhg(-1)。原始电极的X射线光电子能谱(XPS)测量表明，活性物质颗粒周围的粘结剂层较薄，导致了上述电化学性能。全锂离子电池利用正负极上的瓜尔豆胶，表现出接近110mAHg(-1)的稳定放电容量(基于正极活性材料)，并具有高的库仑效率。用XPS对全锂离子电池的循环石墨电极进行了尸检，发现形成了一层薄的固体电解质界面(SEI)。(C)2018爱思唯尔有限公司。保留所有权利。
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 degrees 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. Xray 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 similar to 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). (c) 2018 Elsevier Ltd. All rights reserved.