Construction of an Electron Bridge in PolyoxometalatesGraphene Oxide Ultrathin Nanosheets To Boost the Lithium Storage Performance
Chang, JN (Chang, Jia-Nan)[ 1 ] ; Zhang, M (Zhang, Mi)[ 2 ] ; Gao, GK (Gao, Guang-Kuo)[ 1,3 ] ; Lu, M (Lu, Meng)[ 1 ] ; Wang, YR (Wang, Yi-Rong)[ 1 ] ; Jiang, C (Jiang, Cheng)[ 1 ] ; Li, SL (Li, Shun-Li)[ 1 ] ; Chen, YF (Chen, Yifa)[ 1,2 ]* ; Lan, YQ (Lan, Ya-Qian)[ 1,2 ] *（兰亚乾）
[ 1 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Jiangsu Key Lab Biofunct Mat, Nanjing 210023, Jiangsu, Peoples R China
[ 2 ] South China Normal Univ, Sch Chem, Guangzhou 510006, Guangdong, Peoples R China
[ 3 ] Harbin Univ Sci & Technol, Coll Chem & Environm Engn, Sch Mat Sci & Engn, Harbin 150040, Heilongjiang, Peoples R China
ENERGY & FUELS 2020, 34, 12, 16968–16977
Polyoxometalates (POMs), possessing multiple-electron redox ability, controllable size, and precise structure, hold much promise to be applied as anode materials in lithium-ion batteries (LIBs). However, the applications of them have been largely limited by the low conductivity and dissolution in an electrolyte. Herein, we report a series of covalently connected MnMo6-2NH(2)-GO ultrathin nanosheets (as thin as similar to 1.1 nm), in which MnMo6-2NH(2) as the electron sponge is covalently linked to graphene oxide and the covalent bond as the electron bridge is highly adventurous for battery applications. Specifically, MnMo6-2NH(2)-GO-2 presents a reversible capacity of 1143 mAh (0.1 A g(-1)) after 100 cycles, and the capacity retention is nearly 100% at 1000 mA over 500 cycles. In addition, it also shows excellent rate capability (301 mAh g(-1) in 5 A g(-1)). This work paves a new way in designing POM-based novel electrode materials for high-performance LIBs.