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A high-volumetric-capacity and high-areal-capacity ZnCo₂O₄ anode for Li-ion batteries enabled by a robust biopolymer binder
- Liu, Jie, Xuan, Yuxue, Galpaya, Dilini G. D., Gu, Yuanxiang, Lin, Zhan, Zhang, Shanqing, Yan, Cheng, Feng, Shouhua, Wang, Lei
- Journal of materials chemistry 2018 v.6 no.40 pp. 19455-19462
- anodes, biopolymers, chemistry, guar gum, lithium batteries, mechanical properties, thermoplastics
- Constructing high-areal-capacity anodes with high loading for Li-ion batteries is still an enormous challenge, due to the drastic volume change of large-capacity anode materials during cycling. The conventional PVDF binder system fails to withstand the degradation of high-loading electrodes. Therefore, advanced binders are urgently required. Herein, for the first time, the guar gum (GG) biopolymer has been exploited as a robust binder for micro-sized ZnCo₂O₄ (ZCO) anode materials. Because of its robust mechanical properties and strong interactions with ZCO, the cycling stability of the ZCO anode has been significantly improved with a capacity of 412 mA h g⁻¹ after 600 cycles at 1200 mA g⁻¹. More importantly, the ZCO can act as a “crosslinking agent” to in situ form a robust network with GG, which efficiently maintains the electrode structure stability. Hence, a ZCO anode with an ultrahigh loading of 6.73 mg cm⁻² can be achieved and deliver a high areal capacity of 5.6 mA h cm⁻². Simultaneously, benefiting from the high tap density of micro-ZCO, the ZCO anode gives a high volumetric capacity of 1179 mA h cm⁻³. This study will make a significant contribution to accelerating the progress of designing high-areal-capacity anodes.