期刊
NANO LETTERS
卷 18, 期 1, 页码 467-474出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b04416
关键词
Lithium-ion batteries; anode materials; long cycling; fast charge/discharge
类别
资金
- UW System Applied Research Grant Program (ARG) [106-Y-06-8000-4]
- UWM Research Growth Initiative (RGI)
- UWM start-up
Searching for new anode alternatives in lieu of graphite for lithium-ion batteries that can deliver better electrochemical performance to meet the emerging energy/power demands in electric vehicles becomes particularly challenging. We report a rationally designed hybrid composite as anode in LIB that exhibits a greatly improved gravimetric capacity of 727 mAh/g with a Coulombic efficiency of >99.8% after 3000 cycles at 1.0 C. A capacity of 662 mAh/g at a high rate of 5.0 C was obtained after impressively long 10 000 cycles. From the 50th to 10 000th cycle under 5.0 C, the capacity retention is >97% with a negligible decay of <0.00026% per cycle. The excellence in electro-chemistry is attributed to the efficient stress relax, accommodable space, lack of agglomeration, and solid-electrolyte interphase consuming Li+ of a delicate composite configuration that is composed of a Sn kernel wearing adjustable TiO2 skin.
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