采用溶胶-凝胶法合成碳包覆Li3VO4复合材料(Li3VO4/C),通过X-射线衍射仪(XRD)、扫描电子显微镜(SEM)、热重分析仪(TG)对其进行了表征,探究了该材料作为锂离子电池负极材料的电化学性能。结果表明,该材料具有良好的循环性能和优异的倍率...采用溶胶-凝胶法合成碳包覆Li3VO4复合材料(Li3VO4/C),通过X-射线衍射仪(XRD)、扫描电子显微镜(SEM)、热重分析仪(TG)对其进行了表征,探究了该材料作为锂离子电池负极材料的电化学性能。结果表明,该材料具有良好的循环性能和优异的倍率性能。在1.25 C(1 C=400 m Ah/g)的电流密度下,其首次充电比容量为199.6 m Ah/g,循环150次后,其容量保持率为89.2%。此外,在充放电倍率分别为0.5、1、2、5、10 C时,其充电比容量分别为228.7、202、180.5、149.9、116.6 m Ah/g。展开更多
Due to the high capacity,moderate voltage platform,and stable structure,Li3VO4(LVO) has attracted close attention as feasible anode material for lithium-ion capacitor.However,the intrinsic low electronic conductivity ...Due to the high capacity,moderate voltage platform,and stable structure,Li3VO4(LVO) has attracted close attention as feasible anode material for lithium-ion capacitor.However,the intrinsic low electronic conductivity and sluggish kinetics of the Li+ insertion process severely impede its practical application in lithium-ion capacitors(LICs).Herein,a carbon-coated Li3VO4(LVO/C) hierarchical structure was prepared by a facial one-step solid-state method.The synthesized LVO/C composite delivers an impressive capacity of 435 mAh/g at 0.07 A/g,remarkable rate capability,and nearly 100% capacity retention after 500 cycles at 0.5 A/g.The superior electrochemical properties of LVO/C composite materials are attributed to the improved conductivity of electron and stable carbon/LVO composite structures.Besides,the LIC device based on activated carbon(AC) cathode and optimal LVO/C as anode reveals a maximum energy density of 110 Wh/kg and long-term cycle life.These results provide a potential way for assembling the advanced hybrid lithium-ion capacitors.展开更多
Vanadium oxide Li3VO4 has attracted much attention as anode material for Li-ion batteries in recent years since it has a low and safe redox potential （vs. Li metal）, high specific capacity and its cost is low. Howev...Vanadium oxide Li3VO4 has attracted much attention as anode material for Li-ion batteries in recent years since it has a low and safe redox potential （vs. Li metal）, high specific capacity and its cost is low. However, the poor electronic conductivity and initial low coulombic efficiency limit its practical application. In this mini-review, the state-of-the-art results associated with Li3VO4 are summarized including structure, lithium insertion mechanism, preparation, modification, and electrochemical properties. Finally, the challenges and prospects are also discussed.展开更多
Li3VO4 shows great potential as an intercalation/de-intercalation type anode material for energy-storage devices. Morphology tailoring and surface modification are effective to enhance its lithium storage performance....Li3VO4 shows great potential as an intercalation/de-intercalation type anode material for energy-storage devices. Morphology tailoring and surface modification are effective to enhance its lithium storage performance. In this work, we fabricate carbon coated Li3VO4(C@LVO) rods by a facile morphology inheritance route. The as-prepared C@LVO rods are 400–800 nm in length and 200–400 nm in diameter,and orthorhombic phase with V5+. The unique core-shell rods structure greatly improves the transport ability of electrons and Li+. Such C@LVO submicron-rods as anode materials exhibit excellent rate capability(a reversible capability of 460,438, 416, 359 and 310 m A h g^-1 at 0.2, 1, 2, 5 and 10 C, respectively) and a high stable capacity of 440 and 313 m A h g^-1 up to 300 cycles at 0.2 and 5 C, respectively.展开更多
文摘采用溶胶-凝胶法合成碳包覆Li3VO4复合材料(Li3VO4/C),通过X-射线衍射仪(XRD)、扫描电子显微镜(SEM)、热重分析仪(TG)对其进行了表征,探究了该材料作为锂离子电池负极材料的电化学性能。结果表明,该材料具有良好的循环性能和优异的倍率性能。在1.25 C(1 C=400 m Ah/g)的电流密度下,其首次充电比容量为199.6 m Ah/g,循环150次后,其容量保持率为89.2%。此外,在充放电倍率分别为0.5、1、2、5、10 C时,其充电比容量分别为228.7、202、180.5、149.9、116.6 m Ah/g。
基金funded by the National Natural Science Foundation of China(Nos.51677182 and 51822706)the DNL Cooperation Fund(No.DNL201915)+1 种基金the Beijing Municipal Science and Technology Commission(No.Z181100000118006)the Beijing Nova Program(No.Z171100001117073)。
文摘Due to the high capacity,moderate voltage platform,and stable structure,Li3VO4(LVO) has attracted close attention as feasible anode material for lithium-ion capacitor.However,the intrinsic low electronic conductivity and sluggish kinetics of the Li+ insertion process severely impede its practical application in lithium-ion capacitors(LICs).Herein,a carbon-coated Li3VO4(LVO/C) hierarchical structure was prepared by a facial one-step solid-state method.The synthesized LVO/C composite delivers an impressive capacity of 435 mAh/g at 0.07 A/g,remarkable rate capability,and nearly 100% capacity retention after 500 cycles at 0.5 A/g.The superior electrochemical properties of LVO/C composite materials are attributed to the improved conductivity of electron and stable carbon/LVO composite structures.Besides,the LIC device based on activated carbon(AC) cathode and optimal LVO/C as anode reveals a maximum energy density of 110 Wh/kg and long-term cycle life.These results provide a potential way for assembling the advanced hybrid lithium-ion capacitors.
基金Acknowledgement Financial supports from National Materials Genome Project （No. 2016YFB0700600）, Natural Distinguished Youth Scientists Project of China （No. 51425301）, National Science Foundation Committee of China （Nos. 21374021 and U1601214） and Science and Technology Commission of Shanghai Municipality （No. 14520721800） are greatly appreciated.
文摘Vanadium oxide Li3VO4 has attracted much attention as anode material for Li-ion batteries in recent years since it has a low and safe redox potential （vs. Li metal）, high specific capacity and its cost is low. However, the poor electronic conductivity and initial low coulombic efficiency limit its practical application. In this mini-review, the state-of-the-art results associated with Li3VO4 are summarized including structure, lithium insertion mechanism, preparation, modification, and electrochemical properties. Finally, the challenges and prospects are also discussed.
基金supported by the National Natural Science Foundation of China(21476019 and 21676017)
文摘Li3VO4 shows great potential as an intercalation/de-intercalation type anode material for energy-storage devices. Morphology tailoring and surface modification are effective to enhance its lithium storage performance. In this work, we fabricate carbon coated Li3VO4(C@LVO) rods by a facile morphology inheritance route. The as-prepared C@LVO rods are 400–800 nm in length and 200–400 nm in diameter,and orthorhombic phase with V5+. The unique core-shell rods structure greatly improves the transport ability of electrons and Li+. Such C@LVO submicron-rods as anode materials exhibit excellent rate capability(a reversible capability of 460,438, 416, 359 and 310 m A h g^-1 at 0.2, 1, 2, 5 and 10 C, respectively) and a high stable capacity of 440 and 313 m A h g^-1 up to 300 cycles at 0.2 and 5 C, respectively.
