TY - JOUR
T1 - Carbon/Sulfur Composites Stabilized with Nano-TiNi for High-Performance Li-S Battery Cathodes
AU - Pang, Yuepeng
AU - Xu, Ying
AU - Li, Yongtao
AU - Xu, Fen
AU - Sun, Lixian
AU - Yang, Junhe
AU - Li, Hai Wen
AU - Zheng, Shiyou
N1 - Funding Information:
We gratefully acknowledge the support of the National Science Foundation of China (Grant Nos. 51472161, 51671135, 51472160, U1501242, 51671062, and 51501107). We also acknowledge the support of the Shanghai Outstanding Academic Leaders Plan, the Program of Shanghai Subject Chief Scientist (Grant No. 17XD1403000), and the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning (Grant No. TP2014048).
Publisher Copyright:
© Copyright 2019 American Chemical Society.
PY - 2019/2/25
Y1 - 2019/2/25
N2 - In this work we proposed a novel strategy to prepare high-performance Li-S battery cathodes by nano-TiNi synergistically stabilizing C/S composites, whereby the TiNi/C/S hybrid composites were synthesized by infusing S gas into carbon black (CB) and nano-TiNi composites in vacuum. After several initial conditioning charge/discharge cycles, this unique TiNi/C/S hybrid nanocomposite cathode shows a high capacity (300 mAh/g based on total and 960 mAh/g based on S) with Coulombic efficiency of near 100% at 100 mA/g for around 300 cycles without obvious capacity decay. Due to its high electronic/ionic conductivity, the TiNi/C/S nanocomposite can retain an overall capacity of 150 mAh/g (480 mAh/g based on S) even at a higher current density of 10.0 A/g, demonstrating the outstanding rate capability. The exceptional performance of TiNi/C/S cathode can be ascribed to (i) the strong interactions between nano-TiNi and S to form metal disulfide clusters, (ii) the CB percolating throughout the composite to prevent nano-TiNi and metal sulfides particles from aggregating into large particles during lithiation/delithiation, (iii) the good electronic conductivity of TiNi and CB to facilitate transportation of electrons, and (iv) the flexibility of CB and TiNi alloy to accommodate large volumetric change during lithiation/delithiation. These synergistic interactions among TiNi, C and S provide a new material design strategy to achieve high overall performance of S cathodes for Li-S batteries.
AB - In this work we proposed a novel strategy to prepare high-performance Li-S battery cathodes by nano-TiNi synergistically stabilizing C/S composites, whereby the TiNi/C/S hybrid composites were synthesized by infusing S gas into carbon black (CB) and nano-TiNi composites in vacuum. After several initial conditioning charge/discharge cycles, this unique TiNi/C/S hybrid nanocomposite cathode shows a high capacity (300 mAh/g based on total and 960 mAh/g based on S) with Coulombic efficiency of near 100% at 100 mA/g for around 300 cycles without obvious capacity decay. Due to its high electronic/ionic conductivity, the TiNi/C/S nanocomposite can retain an overall capacity of 150 mAh/g (480 mAh/g based on S) even at a higher current density of 10.0 A/g, demonstrating the outstanding rate capability. The exceptional performance of TiNi/C/S cathode can be ascribed to (i) the strong interactions between nano-TiNi and S to form metal disulfide clusters, (ii) the CB percolating throughout the composite to prevent nano-TiNi and metal sulfides particles from aggregating into large particles during lithiation/delithiation, (iii) the good electronic conductivity of TiNi and CB to facilitate transportation of electrons, and (iv) the flexibility of CB and TiNi alloy to accommodate large volumetric change during lithiation/delithiation. These synergistic interactions among TiNi, C and S provide a new material design strategy to achieve high overall performance of S cathodes for Li-S batteries.
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U2 - 10.1021/acsaem.8b02121
DO - 10.1021/acsaem.8b02121
M3 - Article
AN - SCOPUS:85064984255
SN - 2574-0962
VL - 2
SP - 1537
EP - 1543
JO - ACS Applied Energy Materials
JF - ACS Applied Energy Materials
IS - 2
ER -