Yuheng Zheng

Wuhan University of Technology

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Ju Li

Massachusetts Institute of Technology

Yunhui Huang

Huazhong University of Science and Technology

Sa Li

Tongji University

Wenjian Liu

Qingdao University

Yaxiang Lu

Institute of Physics

Can Zhang

Chinese Academy of Sciences

Sa Li

Tongji University

Yong Xie

Xidian University

Yixing Gao

Hong Kong Polytechnic University

Yong‐Sheng Hu

Chinese Academy of Sciences

Cooperative Institutions

Chinese Academy of Sciences

Tongji University

University of Chinese Academy of Sciences

Huazhong University of Science and Technology

Institute of Physics

Beijing National Laboratory for Molecular Sciences

Wuhan University of Technology

Xi'an Jiaotong University

University of Science and Technology of China

Czech Academy of Sciences, Institute of Physics

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Electrophilicity and Nucleophilicity of Boryl Radicals

The Journal of Organic Chemistry (2017)

Chao Wu Xiufang Hou Yuheng Zheng Pengfei Li Dongmei Lu

We carried out a survey of the relative reactivity of a collection of 91 neutral boryl radicals using density functional calculations. Their reactivities were characterized by four indices, i.e., the global electrophilicity, global nucleophilicity, local electrophilicity, and local nucleophilicity. Particularly, the global electrophilicity and nucleophilicity indices span over a moderately wider range than those of carbon radicals, indicating their potentially broader reactivity. Thus, boryl radicals may be utilized in electrophilic radical reactions, while traditionally they are only considered for nucleophilic radical reactions. In contrast, the local electrophilicity and nucleophilicity indices at the boron center show a different reactivity picture than their global counterparts. The inconsistency is rooted in the low and varying spin density on boron (for most radicals, less than 50%) in different boryl radicals, which is a combinative result of radical stabilization via electron delocalization and the low electronegativity of boron (compared to carbon). In short, the boron character in boryl radicals may be weak and their reactivity is not reflected by the local indices based on boron but by the global ones.

Reactivity

Electronegativity

10.1021/acs.joc.6b02849

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Citations (69)

Novel Li[(CF₃SO₂)(n-C₄F₉SO₂)N]-Based Polymer Electrolytes for Solid-State Lithium Batteries with Superior Electrochemical Performance

ACS Applied Materials & Interfaces (2016)

Qiang Ma Xingguo Qi Bo Tong Yuheng Zheng Wenfang Feng

Solid polymer electrolytes (SPEs) would be promising candidates for application in high-energy rechargeable lithium (Li) batteries to replace the conventional organic liquid electrolytes, in terms of the enhanced safety and excellent design flexibility. Herein, we first report novel perfluorinated sulfonimide salt-based SPEs, composed of lithium (trifluoromethanesulfonyl)(n-nonafluorobutanesulfonyl)imide (Li[(CF3SO2)(n-C4F9SO2)N], LiTNFSI) and poly(ethylene oxide) (PEO), which exhibit relatively efficient ionic conductivity (e.g., 1.04 × 10-4 S cm-1 at 60 °C and 3.69 × 10-4 S cm-1 at 90 °C) and enough thermal stability (>350 °C), for rechargeable Li batteries. More importantly, the LiTNFSI-based SPEs could not only deliver the excellent interfacial compatibility with electrodes (e.g., Li-metal anode, LiFePO4 and sulfur composite cathodes), but also afford good cycling performances for the Li|LiFePO4 (>300 cycles at 1C) and Li-S cells (>500 cycles at 0.5C), in comparison with the conventional LiTFSI (Li[(CF3SO2)2N])-based SPEs. The interfacial impedance and morphology of the cycled Li-metal electrodes are also comparatively analyzed by electrochemical impedance spectra and scanning electron microscopy, respectively. These indicate that the LiTNFSI-based SPEs would be potential alternatives for application in high-energy solid-state Li batteries.

10.1021/acsami.6b10597

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Organic Thiocarboxylate Electrodes for a Room‐Temperature Sodium‐Ion Battery Delivering an Ultrahigh Capacity

Angewandte Chemie (2017)

Hongyang Zhao Jianwei Wang Yuheng Zheng Ju Li Xiaogang Han

Abstract Organic room‐temperature sodium‐ion battery electrodes with carboxylate and carbonyl groups have been widely studied. Herein, for the first time, we report a family of sodium‐ion battery electrodes obtained by replacing stepwise the oxygen atoms with sulfur atoms in the carboxylate groups of sodium terephthalate which improves electron delocalization, electrical conductivity and sodium uptake capacity. The versatile strategy based on molecular engineering greatly enhances the specific capacity of organic electrodes with the same carbon scaffold. By introducing two sulfur atoms to a single carboxylate scaffold, the molecular solid reaches a reversible capacity of 466 mAh g −1 at a current density of 50 mA g −1 . When four sulfur atoms are introduced, the capacity increases to 567 mAh g −1 at a current density of 50 mA g −1 , which is the highest capacity value reported for organic sodium‐ion battery anodes until now.

Carboxylate

Sodium-ion battery

Carbon fibers

10.1002/ange.201708960

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Citations (36)

Carbon Reduction Target

Figshare (2023)

Yuheng Zheng

Carbon reduction target as a policy tool to reduce emissions: empirical evidence from 1st Nationally Determined Contributions

Carbon fibers

10.6084/m9.figshare.21748160.v3

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Citations (0)

Carbon Reduction Target

Figshare (2023)

Yuheng Zheng

Carbon reduction target as a policy tool to reduce emissions: empirical evidence from 1st Nationally Determined Contributions

Carbon fibers

10.6084/m9.figshare.21748160.v4

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Citations (0)

Enhancing tourism and hospitality organizations’ ESG via transformational leadership and employee pro-environmental behavior: The effect of organizational culture

International Journal of Hospitality Management (2024)

Yuheng Zheng Yixing Gao Nicholas J. Thomas

Hospitality

10.1016/j.ijhm.2024.103970

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Citations (1)

Gassing in Sn-Anode Sodium-Ion Batteries and Its Remedy by Metallurgically Prealloying Na

ACS Applied Materials & Interfaces (2019)

Wenjian Liu Xinlong Chen Can Zhang Hui Xu Xin Sun

Despite the high theoretical energy densities of tin as the anode of sodium-ion batteries, its electrochemical performance has been plagued by the inadequate initial Coulombic efficiency (ICE) and poor cycle life. While it is generally believed that mechanical degradation, namely, pulverization and subsequent loss of electrical contact, is the underlying cause, here, we show that gassing is an essential problem in sodium-ion batteries with Sn anode. Since the gas generation appears at a certain voltage, reducing the voltage by metallurgically prealloying Sn with Na could be a solution, with an additional benefit of compensating for "live" Na loss in future cycles. When the metallurgically alloyed foil is used as the anode in Na3V2(PO4)2F3 (NVPF)//alloy full cells, the ICE is significantly improved from 24.68 to 75%, and from the 2nd cycle to the 100th cycle, the average Coulombic efficiency can be maintained up to 99.44%. The full cell can run for 100 cycles, with acceptable capacity decay to 81.4 mAh/g(NVPF) from the initial 112.5 mAh/g(NVPF).

Degradation

10.1021/acsami.9b05005

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Citations (51)

Superior electrochemical performance of sodium-ion full-cell using poplar wood derived hard carbon anode

Energy storage materials (2018)

Yuheng Zheng Yaxiang Lu Xingguo Qi Yuesheng Wang Linqin Mu

Carbon fibers

10.1016/j.ensm.2018.09.002

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Citations (111)

High Temperature-Pressure Metalized Optical Fiber Dual FP Sensor With Welding Encapsulation

IEEE Sensors Journal (2024)

Tianliang Li Tao Huang Yuheng Zheng Nian Wang Xue Han

Encapsulation

10.1109/jsen.2024.3414307

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Citations (0)

Organic Thiocarboxylate Electrodes for a Room‐Temperature Sodium‐Ion Battery Delivering an Ultrahigh Capacity

Angewandte Chemie International Edition (2017)

Hongyang Zhao Jianwei Wang Yuheng Zheng Ju Li Xiaogang Han

Organic room-temperature sodium-ion battery electrodes with carboxylate and carbonyl groups have been widely studied. Herein, for the first time, we report a family of sodium-ion battery electrodes obtained by replacing stepwise the oxygen atoms with sulfur atoms in the carboxylate groups of sodium terephthalate which improves electron delocalization, electrical conductivity and sodium uptake capacity. The versatile strategy based on molecular engineering greatly enhances the specific capacity of organic electrodes with the same carbon scaffold. By introducing two sulfur atoms to a single carboxylate scaffold, the molecular solid reaches a reversible capacity of 466 mAh g-1 at a current density of 50 mA g-1 . When four sulfur atoms are introduced, the capacity increases to 567 mAh g-1 at a current density of 50 mA g-1 , which is the highest capacity value reported for organic sodium-ion battery anodes until now.

10.1002/anie.201708960

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Citations (107)