High Performance Lithium-Ion Hybrid Capacitors Employing Fe3O4-Graphene Composite Anode and Activated Carbon Cathode
High Performance Lithium-Ion Hybrid Capacitors Employing Fe3O4-Graphene Composite Anode and Activated Carbon Cathode
复制标题
采用 Fe3O4-石墨烯复合阳极和活性炭阴极的高性能锂离子混合电容器
DOI：
10.1021/acsami.7b03452
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发表时间：
2017-05-24
影响因子：
9.5
通讯作者：
Ma, Yanwei
中科院分区：
文献类型：
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作者：
Zhang, Shijia;Li, Chen;Ma, Yanwei
锂离子电容器具有优异的电化学性能和高的能量-功率输出，被认为是一种很有前途的储能器件。在本工作中，我们采用一种简单的方法合成了一种由Fe 3 O 4纳米晶机械锚定在石墨烯三维阵列（Fe 3 O 4-G）层之间组成的复合电极材料，该材料与其他传统电极材料相比具有许多优点，例如高的锂存储容量（在0.1 A g（-1）下为820 mAh g（-1））、高电导率和改进的电化学稳定性。在此基础上，利用合适的阴阳极电荷平衡，成功制备了Fe_3 O_4-G//AC软封装LIC，其能量密度高达120.0 Wh kg（-1），功率密度高达45.4 kW kg（-1），（在60.5Wh kg（-1）下实现），并且在1000次循环后高达94.1%和在10000次循环后高达81.4%的优异容量保持率。Fe 3 O 4-G//AC混合装置的能量密度与Ni-金属氢化物电池相当，并且其电容功率能力和循环寿命与超级电容器（SC）相当。因此，这种锂离子混合电容器有望弥合锂离子电池与太阳能电池之间的差距，并在下一代储能领域获得光明的前景。
Lithium-ion capacitors (LICs) are considered as promising energy storage devices to realize excellent electrochemical performance, with high energy-power output. In this work, we employed a simple method to synthesize a composite electrode material consisting of Fe3O4 nanocrystallites mechanically anchored among the layers of three-dimensional arrays of graphene (Fe3O4-G), which exhibits several advantages compared with other traditional electrode materials, such as high Li storage capacity (820 mAh g(-1) at 0.1 A g(-1)), high electrical conductivity, and improved electrochemical stability. Furthermore, on the basis of the appropriated charge balance between cathode and anode, we successfully fabricated Fe3O4-G//activated carbon (AC) soft-packaging LICs with a high energy density of 120.0 Wh kg(-1), an outstanding power density of 45.4 kW kg(-1) (achieved at 60.5 Wh kg(-1)), and an excellent capacity retention of up to 94.1% after 1000 cycles and 81.4% after 10 000 cycles. The energy density of the Fe3O4-G//AC hybrid device is comparable with Ni-metal hydride batteries, and its capacitive power capability and cycle life is on par with supercapacitors (SCs). Therefore, this lithium-ion hybrid capacitor is expected to bridge the gap between Li-ion battery and SCs and gain bright prospects in next-generation energy storage fields.