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Molecular-Scale Functionality on Graphene To Unlock the Energy Capabilities of Metal Hydrides for High-Capacity Lithium-Ion Batteries.
ACS Nano 2018; 12(8):8177-8186AN

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+Show Affiliations

Department of Materials Science , Fudan University , Shanghai 200433 , China. Institute for Superconducting and Electronic Materials , University of Wollongong , North Wollongong , New South Wales 2522 , Australia.Department of Materials Science , Fudan University , Shanghai 200433 , China.Department of Physics , Jimei University , Xiamen 361021 , China.Department of Materials Science , Fudan University , Shanghai 200433 , China.Institute for Superconducting and Electronic Materials , University of Wollongong , North Wollongong , New South Wales 2522 , Australia.State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , China.Department of Physics , Jimei University , Xiamen 361021 , China.State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , China.Department of Materials Science , Fudan University , Shanghai 200433 , China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30063322

Citation

Xia, Guanglin, et al. "Molecular-Scale Functionality On Graphene to Unlock the Energy Capabilities of Metal Hydrides for High-Capacity Lithium-Ion Batteries." ACS Nano, vol. 12, no. 8, 2018, pp. 8177-8186.
Xia G, Zhang B, Chen X, et al. Molecular-Scale Functionality on Graphene To Unlock the Energy Capabilities of Metal Hydrides for High-Capacity Lithium-Ion Batteries. ACS Nano. 2018;12(8):8177-8186.
Xia, G., Zhang, B., Chen, X., Sun, D., Guo, Z., Liang, F., ... 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), pp. 8177-8186. doi:10.1021/acsnano.8b03280.
Xia G, et al. Molecular-Scale Functionality On Graphene to Unlock the Energy Capabilities of Metal Hydrides for High-Capacity Lithium-Ion Batteries. ACS Nano. 2018 Aug 28;12(8):8177-8186. PubMed PMID: 30063322.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Molecular-Scale Functionality on Graphene To Unlock the Energy Capabilities of Metal Hydrides for High-Capacity Lithium-Ion Batteries. AU - Xia,Guanglin, AU - Zhang,Baoping, AU - Chen,Xiaowei, AU - Sun,Dalin, AU - Guo,Zaiping, AU - Liang,Fuxin, AU - Zou,Weidong, AU - Yang,Zhenzhong, AU - Yu,Xuebin, Y1 - 2018/08/03/ PY - 2018/8/1/pubmed PY - 2018/8/1/medline PY - 2018/8/1/entrez KW - graphene KW - lithium-ion batteries KW - magnesium hydride KW - metal hydride KW - self-assembly SP - 8177 EP - 8186 JF - ACS nano JO - ACS Nano VL - 12 IS - 8 N2 - 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. SN - 1936-086X UR - https://www.unboundmedicine.com/medline/citation/30063322/Molecular_Scale_Functionality_on_Graphene_To_Unlock_the_Energy_Capabilities_of_Metal_Hydrides_for_High_Capacity_Lithium_Ion_Batteries_ L2 - https://dx.doi.org/10.1021/acsnano.8b03280 DB - PRIME DP - Unbound Medicine ER -