TY - JOUR
T1 - Hierarchically Structured Ti3C2T MXene Paper for Li-S Batteries with High Volumetric Capacity
AU - zhao, Wenli
AU - Lei, Yongjiu
AU - Zhu, Yunpei
AU - Wang, Qian
AU - Zhang, Fan
AU - Dong, Xiaochen
AU - Alshareef, Husam N.
N1 - KAUST Repository Item: Exported on 2021-05-07
Acknowledgements: This work is financially supported by the Natural Science Foundation of Jiangsu Province (BK20190688), Postdoctoral Reserch Foundation of China (2019M651815), and King Abdullah University of Science and Technology (KAUST).
PY - 2021/5/2
Y1 - 2021/5/2
N2 - Due to the Low density of sulfur as well as the large portion of carbon-based materials used as conducting network and lithium polysulfide (LiPS) host, the practical volumetric energy density of lithium–sulfur (Li–S) batteries barely rivals the Li-ion batteries. Here, MXene (Ti3C2Tx)-based membrane with unique 3D hierarchical structure, high electronic conductivity, abundent active binding sites, fast ion transport ability, and high affinity for lithium polysulfides has been developed as a new host material to improve the electrochemical performance of Li-S batteries. With a density of 2.2 g cm−3, a MXene-based cathode containing 4.0 mg cm−2 sulfur delivers a high volumetric capacity of 2.7 Ah cm−3 after 200 cycles. Based on operando XRD and ex-situ XPS results, we find that the Ti-OH bonds present on the surface of MXene membrane can effectively trigger the LiPS transformation. Furthermore, α-S8, as the stable charge product, is first reported in MXene-based host along with its possible important role in curtailing active mass loss and enhancing cycling capability. Our results reveal that 2D MXene with rationally-designed architecture enable high volumetric capacity Li-S batteries for practical applications.
AB - Due to the Low density of sulfur as well as the large portion of carbon-based materials used as conducting network and lithium polysulfide (LiPS) host, the practical volumetric energy density of lithium–sulfur (Li–S) batteries barely rivals the Li-ion batteries. Here, MXene (Ti3C2Tx)-based membrane with unique 3D hierarchical structure, high electronic conductivity, abundent active binding sites, fast ion transport ability, and high affinity for lithium polysulfides has been developed as a new host material to improve the electrochemical performance of Li-S batteries. With a density of 2.2 g cm−3, a MXene-based cathode containing 4.0 mg cm−2 sulfur delivers a high volumetric capacity of 2.7 Ah cm−3 after 200 cycles. Based on operando XRD and ex-situ XPS results, we find that the Ti-OH bonds present on the surface of MXene membrane can effectively trigger the LiPS transformation. Furthermore, α-S8, as the stable charge product, is first reported in MXene-based host along with its possible important role in curtailing active mass loss and enhancing cycling capability. Our results reveal that 2D MXene with rationally-designed architecture enable high volumetric capacity Li-S batteries for practical applications.
UR - http://hdl.handle.net/10754/669116
UR - https://linkinghub.elsevier.com/retrieve/pii/S2211285521003761
U2 - 10.1016/j.nanoen.2021.106120
DO - 10.1016/j.nanoen.2021.106120
M3 - Article
SN - 2211-2855
SP - 106120
JO - Nano Energy
JF - Nano Energy
ER -
