Journal
ELECTROCHIMICA ACTA
Volume 326, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.134964
Keywords
Polyethylenimine; Hyperbranched structure; Multidimensional hydrogen-bonding; Polymer binder; Silicon anode
Categories
Funding
- Natural Science Foundation of Zhejiang Province [LQ18E040001, LY19E090005, LY19B030006]
- Jiaxing Science and Technology Project [2017AY13009]
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We report the use of cross-linked hyperbranched polyethylenimine (PEI) as a commercially available, eco-friendly, water-soluble, efficient polymer binder for silicon anode of lithium ion battery for the first time. Compared with traditional one-dimensional linear binders, the PEI with 3-dimensional topological hyperbranched structure and high density of amino groups can facilitate stronger multidimensional hydrogen-bonding interactions with silicon nanoparticles which may more effectively buffer large volume change of silicon particles during lithiation/delithiation process. In addition, the cross-linked 3-dimensional network of PEI limits movement of silicon nanoparticles and maintains integrity of the anode. Through optimizing the amount of cross-linking agent, 1,4-butanediol diglycidyl ether, to balance bonding reversibility and mechanical strength of PEI, the cross-linked Si/PEI anode shows significantly improved cycling performance with a specific capacity of 2180 m Ah g(-1) at a current density of 500 mA g(-1) after 100 cycles. (C) 2019 Elsevier Ltd. All rights reserved.
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