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172 results on '"Sun, Chencheng"'

17. A Rooted Multifunctional Heterogeneous Interphase Layer Enabled by Surface‐Reconstruction for Highly Durable Sodium Metal Anodes.

Author

Cao, Liang, Guo, Jia, Feng, Yong, Li, Yue, Qiu, Yawen, Zhu, Wenxuan, Tan, Yajun, Sun, Chencheng, Rui, Xianhong, and Geng, Hongbo

Subjects
SODIUM, DENDRITIC crystals, METALS, TIN selenide, SURFACE reconstruction, ANODES
Abstract

Sodium plating–stripping with high reversibility is still an intractable challenge for sodium metal‐based batteries due to the fragile natural solid‐electrolyte interphase (SEI) film and severe Na dendrites growth. Herein, a surface reconstruction strategy is proposed and a rooted heterogeneous interlayer derived from in situ reactions between tin selenide and Na metal (abbr. Na/SnSe) is produced to regulate Na+ deposition behavior and impede dendrite growth. The high sodiophilic Na15Sn4 component demonstrates the robust combination and dendrite suppression capability, inhibiting fracture and delamination problems during volume variation. Meanwhile, the superionic Na2Se ingredient contributes to the optimized Na+ conduction efficiency and low nucleation overpotential, enabling uniform distribution of electrical fields and ultimately eliminating Na dendrites. Consequently, the reconfigured multifunctional Na/SnSe interphase realizes a long‐term lifespan over 2400 h at 0.5 mA cm−2/1 mAh cm−2 in symmetric cell with an extremely low voltage hysteresis. Moreover, the assembled Na/SnSe||NaNi1/3Fe1/3Mn1/3O2 pouch cell achieves exceptional cycling stability and capacity retention (90.4 mAh g−1 after 1800 cycles at a high current density of 2 A g−1), exploiting an avenue for designing durable SEI layer and high‐quality sodium metal batteries. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Unprecedented Formation of a Binuclear Au(II)–Au(II) Complex through Redox State Cycling: Electrochemical Interconversion of Au(I)–Au(I), Au(II)–Au(II), and Au(I)–Au(III) in Binuclear Complexes Containing the Carbanionic Ligand C6F4PPh2

Author

Sun, Chencheng, primary, Mirzadeh, Nedaossadat, additional, Guo, Si-Xuan, additional, Li, Jiezhen, additional, Li, Zhengkui, additional, Bond, Alan M., additional, Zhang, Jie, additional, and Bhargava, Suresh K., additional

Published
2019
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50. Pseudocapacitance-boosted ultrafast and stable Na-storage in NiTe2 coupled with N-doped carbon nanosheets for advanced sodium-ion half/full batteries.

Author

Han, Xu, Jiang, Qilei, Zhang, Mengling, Qin, Zheng, Geng, Hongbo, Sun, Chencheng, and Gu, Hongwei

Subjects
NANOSTRUCTURED materials, SODIUM ions, ENERGY storage, ENERGY density, ELECTROCHEMICAL analysis, CARBON foams
Abstract

Developing high-rate and durable anode materials for sodium-ion batteries (SIBs) is still a challenge because of the larger ion radius of sodium compared with the lithium ion during charge–discharge processes. Herein, NiTe2 coupled with N-doped carbon (NiTe2/NC) hexagonal nanosheets has been fabricated through a solvothermal and subsequent carbonisation strategy. This unique hexagonal nanosheet structure offers abundant active sites and contact area to the electrolyte, which could shorten the Na+ diffusion path. The heterostructured N-doping carbon improves the electrochemical conductivity and accelerates the kinetics of Na+ transportation. Electrochemical analysis shows that the charge–discharge process is controlled by the pseudocapacitive behavior thus leading to high-rate capability and long lifespan in half batteries. As expected, high capacities of 311 mA h g−1 to 217 mA h g−1 at 5 A g−1 to 10 A g−1 are maintained after 800 and 1200 cycles, respectively. Furthermore, a full battery equipped with a Na3V2(PO4)2O2F cathode and a NiTe2/NC anode offers a maximum energy density of 104 W h kg−1 and a maximum power density of 9116 W kg−1. The results clearly show that the NiTe2/NC hexagonal nanosheet with superior Na storage properties is an advanced new material for energy storage systems. [ABSTRACT FROM AUTHOR]

Published
2021
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