期刊
NANO ENERGY
卷 12, 期 -, 页码 178-185出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2014.12.011
关键词
Fibers reinforcement; High capacity silicon electrodes; Water-based binders; Lithium-ion batteries
类别
资金
- Australia Research Council
- Office of Vehicle Technologies of the U.S. Department of Energy (U.S. DOE) [DE-AC02-05CH 11231]
Si has attracted enormous research and manufacturing attention as an anode material for lithium ion batteries (LIBs) because of its high specific capacity. The lack of a low cost and effective mechanism to prevent the pulverization of Si electrodes during the lithiation/delithiation process has been a major barrier in the mass production of Si anodes. Naturally abundant gum arabic (GA), composed of polysaccharides and glycoproteins, is applied as a dual-function binder to address this dilemma. Firstly, the hydroxyl groups of the polysaccharide in GA are crucial in ensuring strong binding to Si. Secondly, similar to the function of fiber in fiber-reinforced concrete (FRC), the long chain glycoproteins provide further mechanical tolerance to dramatic volume expansion by Si nanoparticles. The resultant Si anodes present an outstanding capacity of ca. 2000 mAh/g at a 1 C rate and 1000 mAh/g at 2 C rate, respectively, throughout 500 cycles. Excellent long-term stability is demonstrated by the maintenance of 1000 mAh/g specific capacity at 1 C rate for over 1000 cycles. This low cost, naturally abundant and environmentally benign polymer is a promising binder for LIBs in the future. (C) 2014 Elsevier Ltd. All rights reserved.
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