石墨烯包覆材料的制备及电化学性能探究

Preparation and Electrochemical Properties of Graphene Nanosheets Wrapped Nanomaterials

为减少水滑石(Layered Double Hydroxide,LDH)用作电极材料时的体积膨胀效应造成电化学性能衰减,本文利用石墨烯纳米片包覆CoNi-LDH制备复合材料。该材料被用作负极材料时,比容量相对于LDH有明显的改善。在电流密度为0.05和2.0 A·g^(-1)时,所达到的首次放电容量是1388、495 mAh·g^(-1)。在0.05 A·g^(-1)的电流密度下,经过20个循环仍保持近乎70%的容量保持率。

In order to reduce the attenuation of electrochemical performance caused by volume expansion when layered double hydroxide(LDH)was used as electrode material,the morphology and structure characterization of cobalt-nickel-LDH and graphene nanosheets were studied.When used as a lithium-ion anode material,it was found that its specific capacity was significantly improved compared to LDH.When the current density was 0.05 and 2.0 A·g^(-1),the initial discharge capacity reached 1388 and 495 mAh·g^(-1).After setting the current density to 0.05 A·g^(-1),after 20 cycles,its capacity retention rate can reach nearly 70%.