▎ 摘　　要

Unlike for SnO2, few studies have reported on the use of SnC2O4 as an anode material for rechargeable lithium batteries. Here, we first introduce a SnC2O4-reduced graphene oxide composite produced via hydrothermal reactions followed by a layer-by-layer self-assembly process. The addition of rGO increased the electric conductivity up to similar to 10(-3) S cm(-1). As a result, the SnC2O4-reduced graphene oxide electrode exhibited a high charge (oxidation) capacity of similar to 1166 mAh g(-1) at a current of 100 mA g(-1) (0.1 C-rate) with a good retention delivering approximately 620 mAh g(-1) at the 200th cycle. Even at a rate of 10 C (10 A g(-1)), the composite electrode was able to obtain a charge capacity of 467 mAh g(-1). In contrast, the bare SnC2O4 had inferior electrochemical properties relative to those of the SnC2O4-reduced graphene oxide composite: similar to 643 mAh g(-1) at the first charge, retaining 192 mAh g(-1) at the 200th cycle and 289 mAh g(-1) at 10 C. This improvement in electrochemical properties is most likely due to the improvement in electric conductivity, which enables facile electron transfer via simultaneous conversion above 0.75 V and de/alloy reactions below 0.75 V: SnC2O4 + 2Li(+) + 2e(-) -> Sn + Li2C2O4 + xLi(+) + xe(-) -> LixSn on discharge (reduction) and vice versa on charge. This was confirmed by systematic studies of ex situ X-ray diffraction, transmission electron microscopy, and time-of-flight secondary-ion mass spectroscopy.