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Molecular-Scale Functionality on Graphene To Unlock the Energy Capabilities of Metal Hydrides for High-Capacity Lithium-Ion Batteries

Journal Article


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Abstract


  • Metal hydrides have attracted great intentions

    as anodes for lithium-ion batteries (LIBs) due to their

    extraordinary theoretical capacity. It is an unsolved challenge,

    however, to achieve high capacity with stable cyclability,

    owing to their insulating property and large volume expansion

    upon lithium storage. Here, we introduce self-initiated

    polymerization to realize molecular-scale functionality of

    metal hydrides with conductive polymer, that is, polythiophene

    (PTh), on graphene, leading to the formation of

    MgH2@PTh core−shell nanoparticles on graphene. The

    nanoscale characteristics of MgH2 not only relieve the

    induced stress upon volume changes but also allow fast

    diffusivity and high reactivity for Li-ion transport. More importantly, the conformal coating of ultrathin PTh membrane

    can effectively suppress the detrimental reactions between MgH2 and electrolyte, provide enhanced performance with

    facile electron and Li+ transport, and preserve its structural integrity, attributed to the strong molecular interaction

    between PTh and MgH2 as well as its various products during electrochemical reactions. With this structure, a high

    reversible specific capacity of 1311 mAh g−1 at 100 mA g−1, excellent rate performance of 1025 mAh g−1 at 2000 mA g−1,

    and a capacity retention of 84.5% at 2000 mA g−1 after 500 cycles are observed for MgH2@PTh nanoparticles as anode for

    LIBs.

Authors


  •   Xia, Guanglin
  •   Zhang, Baoping (external author)
  •   Chen, Xi (external author)
  •   Sun, Dalin (external author)
  •   Guo, Zaiping
  •   Liang, Fuxin (external author)
  •   Zou, Weidong (external author)
  •   Yang, Zhenzhong (external author)
  •   Yu, Xuebin (external author)

Publication Date


  • 2018

Citation


  • Xia, G., Zhang, B., Chen, X., Sun, D., Guo, Z., Liang, F., Zou, W., Yang, Z. & Yu, X. (2018). Molecular-Scale Functionality on Graphene To Unlock the Energy Capabilities of Metal Hydrides for High-Capacity Lithium-Ion Batteries. ACS Nano, 12 (8), 8177-8186.

Scopus Eid


  • 2-s2.0-85055755319

Ro Full-text Url


  • https://ro.uow.edu.au/context/aiimpapers/article/4667/type/native/viewcontent

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3613

Number Of Pages


  • 9

Start Page


  • 8177

End Page


  • 8186

Volume


  • 12

Issue


  • 8

Place Of Publication


  • United States

Abstract


  • Metal hydrides have attracted great intentions

    as anodes for lithium-ion batteries (LIBs) due to their

    extraordinary theoretical capacity. It is an unsolved challenge,

    however, to achieve high capacity with stable cyclability,

    owing to their insulating property and large volume expansion

    upon lithium storage. Here, we introduce self-initiated

    polymerization to realize molecular-scale functionality of

    metal hydrides with conductive polymer, that is, polythiophene

    (PTh), on graphene, leading to the formation of

    MgH2@PTh core−shell nanoparticles on graphene. The

    nanoscale characteristics of MgH2 not only relieve the

    induced stress upon volume changes but also allow fast

    diffusivity and high reactivity for Li-ion transport. More importantly, the conformal coating of ultrathin PTh membrane

    can effectively suppress the detrimental reactions between MgH2 and electrolyte, provide enhanced performance with

    facile electron and Li+ transport, and preserve its structural integrity, attributed to the strong molecular interaction

    between PTh and MgH2 as well as its various products during electrochemical reactions. With this structure, a high

    reversible specific capacity of 1311 mAh g−1 at 100 mA g−1, excellent rate performance of 1025 mAh g−1 at 2000 mA g−1,

    and a capacity retention of 84.5% at 2000 mA g−1 after 500 cycles are observed for MgH2@PTh nanoparticles as anode for

    LIBs.

Authors


  •   Xia, Guanglin
  •   Zhang, Baoping (external author)
  •   Chen, Xi (external author)
  •   Sun, Dalin (external author)
  •   Guo, Zaiping
  •   Liang, Fuxin (external author)
  •   Zou, Weidong (external author)
  •   Yang, Zhenzhong (external author)
  •   Yu, Xuebin (external author)

Publication Date


  • 2018

Citation


  • Xia, G., Zhang, B., Chen, X., Sun, D., Guo, Z., Liang, F., Zou, W., Yang, Z. & Yu, X. (2018). Molecular-Scale Functionality on Graphene To Unlock the Energy Capabilities of Metal Hydrides for High-Capacity Lithium-Ion Batteries. ACS Nano, 12 (8), 8177-8186.

Scopus Eid


  • 2-s2.0-85055755319

Ro Full-text Url


  • https://ro.uow.edu.au/context/aiimpapers/article/4667/type/native/viewcontent

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3613

Number Of Pages


  • 9

Start Page


  • 8177

End Page


  • 8186

Volume


  • 12

Issue


  • 8

Place Of Publication


  • United States