Synthesis and Electrochemical Characterization of Lithium Carboxylate 2D Compounds as High‐Performance Anodes for Li−Ion Batteries
Synthesis and Electrochemical Characterization of Lithium Carboxylate 2D Compounds as High‐Performance Anodes for Li−Ion Batteries
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DOI：
10.1002/celc.201901965
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发表时间：
2020-01
期刊：
影响因子：
4
通讯作者：
Haitao Zhang;Yichao Lin;Liang Chen;Deyu Wang;Hengsheng Hu;Cai Shen
中科院分区：
文献类型：
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作者：
Haitao Zhang;Yichao Lin;Liang Chen;Deyu Wang;Hengsheng Hu;Cai Shen
锂离子电池在电动汽车中的大规模使用迫切需要开发具有成本效益和高性能的电极材料。本文中，我们报道了通过使用简单的溶剂热方法合成共轭羧酸盐（Li 4C 8H 2 O 6）和非共轭羧酸盐（Li 4C 4 H2O 6）及其作为锂离子电池负极材料的应用。原子力显微镜观察表明，合成的Li 4C 8H 2 O 6和Li 4C 4 H2O 6具有片状形貌，厚度为3-5 nm。 在50 mA/g的电流密度下，Li 4C 8H 2 O 6和Li 4C 4 H2O 6的首次放电容量分别为251.7 mAh/g和251.6 mAh/g。 此外，Li 4C 8H 2 O 6与少量（5重量%）石墨烯和纳米Si组合以增强循环性能和比容量。 因此，Li 4C 8H 2 O 6/石墨烯和Li 4C 8H 2 O 6/纳米Si复合材料在100 mA/g的相对较高的电流密度下分别呈现350 mAh/g和240 mAh/g的高放电容量。 这些结果表明，羧酸锂是锂离子电池有前途的负极材料。
The large‐scale utilization of Li‐ion batteries in electric vehicles requires urgent development of cost‐effective and high‐performance electrode materials. Herein, we report the synthesis of conjugated carboxylate (Li4C8H2O6) and non‐conjugated carboxylate (Li4C4H2O6) by using a simple solvothermal method and its utilization as anode materials in Li‐ion batteries. Atomic force microscopy reveals that as‐prepared Li4C8H2O6and Li4C4H2O6possess a sheet‐like morphology with a thickness of 3–5 nm. An initial discharge capacities of 251.7 mAh/g and 251.6 mAh/g at a current density of 50 mA/g can be obtained for Li4C8H2O6and Li4C4H2O6,respectively. In addition, Li4C8H2O6is combined with a small amount (5 wt. %) of graphene and nano‐Si to enhance the cyclic performance and specific capacity. Consequently, Li4C8H2O6/graphene and Li4C8H2O6/nano‐Si composites rendered a high discharge capacity of 350 mAh/g and 240 mAh/g, respectively, at a relatively higher current density of 100 mA/g. These results demonstrate that lithium carboxylates are promising anode materials for Li‐ion batteries.