▎ 摘　　要

To address the poor cycling stability and low rate capability of MoS2 as electrode materials for lithium-ion batteries (LIBs), herein, the CoS2/MoS2/PDDA-rGO/PMo12 nanocomposites are constructed via a simple hydrothermal process, combining the advantages of all three, namely, CoS2/MoS2 heterojunction and polyoxometalates (POMs) provide abundant catalytically active sites and increase the multi-electron transfer ability, and the positively charged poly(diallyldimethylammonium chloride) modified reduced graphene oxide (PDDA-rGO) improve electronic conductivity and effectively prevent the aggregation of MoS2, meanwhile stabilize the negatively charged [PMo12O40](3-). After the electrochemical testing, the resulting CoS2/MoS2/PDDA-rGO/PMo12 nanocomposite achieved 1055 mAhg(-1) initial specific capacities and stabilized at 740 mAhg(-1) after 150 cycles at 100 mAg(-1) current density. And the specific capacities of MoS2, MoS2/PDDA-rGO, CoS2/MoS2, and CoS2/MoS2/PDDA-rGO were 201, 421, 518, and 589 at 100 mAg(-1) after 150 cycles, respectively. The fact of the greatly improving capacity of MoS2-based nanocomposites suggests its potential for high performance electrode materials of LIBs. Moreover, the lithium storage mechanism of CoS2/MoS2/PDDA-rGO/PMo12 has been discussed on the basis of cyclic voltammetry with different scan rates.