Enhanced conversion reaction kinetics in low crystallinity SnO2/CNT anodes for Na-ion batteries
作者： Jiang Cui , Zheng-Long Xu , Shanshan Yao , Jiaqiang Huang , Jian-Qiu Huang
DOI: 10.1039/C6TA03541H
关键词: Oxide 、 Materials science 、 Anode 、 Electrochemical kinetics 、 Ion 、 Nanoparticle 、 Crystallinity 、 Carbon nanotube 、 Nanotechnology 、 Kinetics 、 Chemical engineering
摘要: The specific capacities of SnO2 anodes in sodium ion batteries (SIBs) are far below the values expected from theory. Herein, we propose that kinetically-controlled, reversible ‘conversion reaction’ between Na ions and is responsible for storage where diffusion rate limiting factor. This revelation contrary to current understanding ‘alloying as major reaction process. Aiming fully utilize theoretical capacity conversion reaction, a composite electrode consisting carbon nanotubes coated with mainly amorphous phase together crystalline nanoparticles synthesized. SnO2/CNT deliver superior 630.4 mA h g−1 at 0.1 A 324.1 high 1.6 due enhanced kinetics. volume expansion accommodated by CNT substrate, giving rise an excellent 69% retention after 300 cycles. aforementioned findings give new insight into fundamental electrochemical kinetics electrodes offer potential solution low poor cyclic stability other metal oxide based on reactions.
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