posted on 2017-12-13, 00:00authored byShuai Kang, Xi Chen, Junjie Niu
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 electrochemistry
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”.