V2O5正极材料的合成及电化学性能研究
Synthesis and electrochemical properties of V2O5 cathode materials
V2O5因能量密度高成为水系锌离子电池最有潜力的正极材料之一,但在高电流密度下稳定性和导电性较差。为了改善其充放电性能和高电流密度下的稳定性,采用水热法合成了十二烷胺掺杂氧化钒纳米管(VONTs)。使用扫描电子显微镜和透射电子显微镜观察到材料呈棒状,该结构有助于锌离子的插入/脱出,从而提升氧化钒纳米管的电化学性能。电化学测试结果表明,在电流密度为2 A/g时,VONTs的放电比容量为165.6 mAh/g,经历390次循环后放电容量仍保持约66.2 mAh/g,容量保持率为40%,相比于V2O5,具有较好的循环稳定性。
V2O5 is one of the most promising cathode materials for aqueous zinc-ion batteries due to its high energy density,but it has poor stability and conductivity at high current density.In order to improve its charge-discharge performance and stability at high current density,the vanadium oxide nanotubes (VONTs) were prepared by doping dodecylamine with hydrothermal method.The material was observed to be rod-shaped by scanning electron microscopy and transmission electron microscopy.This structure facilitates the intercalation/deintercalation of zinc ions,thereby improving electrochemical properties of VONTs.The electrochemical test results show that the specific discharge capacity of VONTs is 165.6 mAh·g-1 when the current density is 2 A·g-1.After 390 cycles,the discharge capacity still retains approximately 66.2 mAh·g-1 with the capacity retention rate of 40%.Compared with V2O5,VONTs has better cycle stability.
水系锌离子电池 / 电化学性能 / 氧化钒纳米管 / 水热法 / V2O5
aqueous zinc-ion battery / electrochemical performance / vanadium oxide nanotubes (VONTs) / hydrothermal method / V2O5
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广东省教育厅2024年度特色创新(自然科学类)项目(2024KTSCX411)
广东省教育厅2024年度创新团队项目—智能汽车关键技术研发创新团队(2024KCXTD091)
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