Ni2P/Graphene Sheets as Anode Materials with Enhanced Electrochemical Properties versus Lithium

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• 作者：Yi Lu ; Xiuli Wang ; Yongjin Mai ; Jiayuan Xiang ; Heng Zhang ; Lu Li ; Changdong Gu ; Jiangping Tu ; Scott X. Mao
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：October 25, 2012
• 年：2012
• 卷：116
• 期：42
• 页码：22217-22225
• 全文大小：743K
• 年卷期：v.116,no.42(October 25, 2012)
• ISSN：1932-7455

文摘

Hybridizing Ni₂P/graphene sheet composite is successfully accomplished via a one-pot solvothermal method. As anode materials for lithium-ion batteries, the Ni₂P spheres with sizes of 10鈥?0 nm can effectively prevent the agglomeration of graphene sheets. In turn, the graphene sheets with good electrical conductivity serve as a conducting network for fast electron transfer between the active materials and charge collector, as well as buffered spaces to accommodate the volume expansion/contraction during cycling. The cyclic stability and rate capability of Ni₂P are significantly improved after the incorporation of graphene sheets. After 50 cycles, the Ni₂P/graphene sheet hybrid delivers a capacity of 450 mA h g^鈥? and 360 mA h g^鈥? at a current density of 54.2 and 542 mA g^鈥?, respectively. The voltage hysteresis of Ni₂P with and without graphene sheets is also discussed. The incorporation of graphene sheets can partly decrease the voltage polarization, and modify the thickness of solid electrolyte interface (SEI) film.