石墨烯负载Ni2P纳米片作为锂硫电池的硫基复合正极材料 |
Ni2P Nanosheets on Graphene as Sulfur-Based Composite Cathode Material for Lithium-Sulfur Batteries |
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摘要: 将磷化镍纳米片均匀负载到石墨烯(G)上制备出Ni2P/G复合材料,并将其作为硫载体构筑了硫基复合材料(S/Ni2P/G)。研究表明,磷化镍纳米片对可溶性多硫化物具有强的化学作用和较高的电催化活性,使S/Ni2P/G硫基复合材料表现出良好的电化学性能。特别是,在高硫含量(80.3%)和低电解液用量(15μL·mg-1)条件下,S/Ni2P/G硫基复合材料展现出1 164.7mAh·g-1的质量比容量和良好的循环稳定性。此外,S/Ni2P/G复合材料具有高的振实密度(1.02 g·cm-3),其体积比容量高达954.0mAh·cm-3,约为S/G复合材料体积比容量的1.6倍。 |
关键词: 锂硫电池 硫正极 石墨烯 磷化镍 |
基金项目: 国家自然科学基金(No.52174281,22075151)和高等学校博士点专项基金(No.B2021203016)资助。 |
Abstract: In this work, nickel phosphide (Ni2P) nanosheets were dispersed uniformly on graphene (G) to fabricate the Ni2P/G composite. Furthermore, the S/Ni2P/G sulfur- based composite was prepared further for lithium- sulfur batteries. Due to the strong chemical absorbability and high electrocatalytic activity of Ni2P nanosheets towards soluble polysulfides, S/Ni2P/G composite showed superior electrochemical performance. In particular, under the condition of high sulfur content (80.3%) and low electrolyte usage (15 μL·mg-1), S/Ni2P/G composite delivered a high initial specific discharge capacity of 1 164.7 mAh·g-1 and good cycling stability. In addition, due to the high tap density of 1.02 g·cm-3, S/Ni2P/G composite showed a high volumetric capacity of 954.0 mAh·cm-3, almost 1.6 times of that for S/G composite. |
Keywords: lithium-sulfur batteries sulfur cathode graphene nickel phosphide |
投稿时间:2021-11-17 修订日期:2022-02-07 |
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高睿,王振宇,王璐,陈鹏,刘胜,马志鹏,邵光杰.石墨烯负载Ni2P纳米片作为锂硫电池的硫基复合正极材料[J].无机化学学报,2022,38(4):685-694. |
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