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36 results on '"Sun, Deye"'

5. Unraveling the Spatial Asynchronous Activation Mechanism of Oxygen Redox‐Involved Cathode for High‐Voltage Solid‐State Batteries

Author

Hu, Naifang, primary, Zhang, Yu‐Han, additional, Yang, Yuan, additional, Wu, Hui, additional, Liu, Yuehui, additional, Hao, Congyi, additional, Zheng, Yue, additional, Sun, Deye, additional, Li, Wenru, additional, Li, Jiedong, additional, Hu, Zhiwei, additional, Chan, Ting‐Shan, additional, Kao, Cheng‐Wei, additional, Kong, Qingyu, additional, Wang, Xiaogang, additional, Haw, Shu‐Chih, additional, Ma, Jun, additional, and Cui, Guanglei, additional

Published
2024
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17. Self‐Polarized Organic–Inorganic Hybrid Ferroelectric Cathode Coatings Assisted High Performance All‐Solid‐State Lithium Battery.

Author

Li, Wenru, Zhang, Shu, Zheng, Weijie, Ma, Jun, Li, Lin, Zheng, Yue, Sun, Deye, Wen, Zheng, Liu, Zhen, Wang, Yaojin, Zhang, Guangzu, and Cui, Guanglei

Subjects
SOLID state batteries, LITHIUM cells, SPACE charge, FERROELECTRIC materials, ELECTRIC fields, CATHODES, ELECTROCHEMICAL electrodes
Abstract

Ferroelectrics can significantly boost electrochemical performances of all‐solid‐state batteries by constructing built‐in electric field to reduce the space charge layer at cathode/solid‐state electrolyte interface. However, the construction mechanism of ferroelectric built‐in electric field is poorly understood. Herein, the guanidinium perchlorate (GClO4) ferroelectrics as the cathode coatings in the LiCoO2‐based all‐solid‐state lithium battery are reported, which has state‐of‐the‐art specific capacity of 210.6 mAh g−1 (91.6% of the liquid battery). Systematic studies reveal that the flexoelectric effect originating from the lattice mismatch between GClO4 and LiCoO2 gives GClO4 coatings the single‐domain state and upward self‐polarization. Consequently, a vertically downward built‐in electric field is generated relative to the cathode, which transports the lithium ions inside the electrolyte to the three‐phase interface to alleviate the space charge layer. These findings highlight that the microstructural characteristics of ferroelectric and electrode materials are the primary concern for building an effective built‐in electric field. [ABSTRACT FROM AUTHOR]

Published
2023
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35. New small molecule gel electrolyte with high ionic conductivity for Li-S batteries.

Author

Zhu, Shaoyin, Ma, Furui, Wang, Yanqing, Yan, Wenchao, Sun, Deye, and Jin, Yongcheng

Subjects
LITHIUM sulfur batteries, IONIC conductivity, POLYMER colloids, ELECTROLYTES, METHYL ether, ELECTROCHEMISTRY
Abstract

A new small molecule gel electrolyte is developed by trapping an organic mixture of 1,3-dioxolane and dimethyl ether with lithium bistrifluoromethanesulfonimide (LiTFSI). The electrochemical properties of the resulting gel electrolyte are investigated. AC impedance spectroscopy reveals that the ionic conductivity of the as-prepared gel electrolyte containing 8.3 wt% small molecules displays a maximum value of 6.43 × 10 S cm at room temperature. The possible interaction between molecule and LiTFSI was investigated by the NMR spectra and a speculated transmission mechanism was also discussed. The sulfur cathode with the as-prepared small molecule gel electrolyte displays the initial discharge specific capacity of 1008 mAh g (0.1 C). The Li-S cells assembled with the as-prepared electrolyte membrane display an excellent cycle performance and coulombic efficiency. The electrolyte membrane played an important role in restraining the shuttle effect of polysulfides. These experimental results demonstrate the possibility and potential as new solid electrolyte for Li-S batteries to replace the traditional polymer gel electrolyte. [ABSTRACT FROM AUTHOR]

Published
2017
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36. Hierarchical structured Mn 2 O 3 nanomaterials with excellent electrochemical properties for lithium ion batteries.

Author

Meng S, Yan W, Ma X, Sun D, Jin Y, and He K

Abstract

A series of Mn 2 O 3 nanomaterials with hierarchical porous structures was synthesized using three types of leaves as templates. In addition to their different morphologies, different porous nanostructures were achieved by choosing different leaves. The Mn 2 O 3 nanomaterial prepared by using gingko leaves as a template provides a larger pore volume and a higher Brunauer-Emmett-Teller (BET) surface area. At the same time, this material also displays excellent electrochemical performance, that is, the specific capacities are 1274.6 mA h g -1 after 300 cycles and 381.5 mA h g -1 at current densities of 300 and 3000 mA g -1 , respectively., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

Published
2019
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