Lithium ion battery (LIB) is widely used energy storage device. Herein, we report the preparation of ZnWO₄/SnO₂ nanocomposite and ZnWO₄/SnO₂@r-GO nanocomposite via solvothermal method. The structural, elemental and morphological properties of the prepared samples are characterized using x-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDAX), high-resolution transmission electron microscopy (HR-TEM), Brunauer-Emmett-Teller (BET) measurements, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) techniques. The prepared samples are tested as an anode for LIB. The ZnWO₄/SnO₂ (5%) nanocomposite delivers initial discharge capacity of 882 mAh g⁻¹ at a current density of 100 mA g⁻¹, while, the specific capacity increases with the increase of SnO₂ upto 10% tested in present case. Further, ZnWO₄/SnO₂@r-GO nanocomposite exhibits a discharge capacity of 1486 mAh g⁻¹ which is higher than that of ZnWO₄/SnO₂ nanocomposite. In addition, after 500 cycles ZnWO₄/SnO₂@r-GO nanocomposite exhibits 89.8% cycle life and 98% of discharge capacity retention. These results indicate that, ZnWO₄/SnO₂@r-GO nanocomposite is a promising anode material for LIB.

锂离子电池（LIB）是广泛使用的储能设备。在本文中，我们报道了通过溶剂热法制备ZnWO ₄ / SnO ₂纳米复合材料和ZnWO ₄ / SnO ₂ @ r-GO纳米复合材料。使用X射线衍射（XRD），扫描电子显微镜（SEM），能量色散X射线光谱（EDAX），高分辨率透射电子显微镜（HR-TEM）对所制备样品的结构，元素和形态学特性进行表征），Brunauer-Emmett-Teller（BET）测量，拉曼光谱和X射线光电子能谱（XPS）技术。测试制备的样品作为LIB的阳极。ZnWO ₄ / SnO ₂（5％）纳米复合材料在100 mA g ^-1的电流密度下提供了882 mAh g ^-1的初始放电容量，而在当前情况下，比容量随SnO _2的增加而增加，最高可达10％。此外，ZnWO ₄ / SnO ₂ @ r-GO纳米复合材料表现出的放电容量为1486 mAh g ^-1，高于ZnWO ₄ / SnO ₂纳米复合材料的放电容量。另外，经过500次循环后，ZnWO ₄ / SnO ₂ @ r-GO纳米复合材料的循环寿命为89.8％，放电容量保持率为98％。这些结果表明，ZnWO ₄ / SnO ₂r-GO纳米复合材料是LIB的有希望的阳极材料。