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Carboxymethyl chitosan: A new water soluble binder for Si anode of Li-ion batteries

2013; Elsevier BV; Volume: 247; Linguagem: Inglês

10.1016/j.jpowsour.2013.08.073

1873-2755

Yue Lu, Lingzhi Zhang, Haoxiang Zhong,

Advanced Battery Materials and Technologies

Carboxymethyl chitosan (C-chitosan) is investigated as a new water soluble binder for Si anode of Li-ion batteries. The Fourier transformation infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) measurements reveal that the strong hydrogen bonding is formed between the hydroxylated Si surface and the polar groups (–OH, –COOH and –NH2) of C-chitosan. The Si/C-chitosan anode (Si:carbon black:C-chitosan = 62:30:8 in weight ratio) exhibits a high first discharge capacity (4270 mAh g−1) with a first coulombic efficiency of 89%, and maintains a capacity of 950 mAh g−1 at the current density of 500 mA g−1 over 50 cycles.