High energy Li-ion capacitors with conversion type Mn3O4 particulates anchored to few layer graphene as the negative electrode
High energy Li-ion capacitors with conversion type Mn3O4 particulates anchored to few layer graphene as the negative electrode
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DOI：
10.1039/c6ta05944a
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发表时间：
2016-10
影响因子：
--
通讯作者：
M. Ulaganathan;V. Aravindan;W. Ling;Q. Yan;S. Madhavi
中科院分区：
文献类型：
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作者：
M. Ulaganathan;V. Aravindan;W. Ling;Q. Yan;S. Madhavi
本文报道了用固定在少层石墨烯上的转换型Mn 3 O 4八面体（Mn 3 O 4-G）作为负极，活性炭（AC）作为正极制备高能锂离子电容器（LICs）。首先，Mn 3 O 4-G复合材料通过水热方法使用市售的石墨烯纳米片制备。两个电极（AC和Mn 3 O 4-G）的Li存储研究在具有金属Li的单电极/半电池配置中进行以评估质量平衡。在制造LIC之前，Mn 3 O 4-G在世伟洛克接头中与Li预锂化，随后与所需负载的AC配对。AC/Mn 3 O 4-G基LIC的最大能量密度为142 W h kg−1，具有9000次循环的出色循环能力，保持率为80%。这一结果无疑为开发使用转换型负电极而不是传统的插入型阳极的高能LIC提供了新的途径。
We report the fabrication of high energy Li-ion capacitors (LICs) using conversion type Mn3O4 octahedrons anchored to few layer graphene (Mn3O4-G) as the negative electrode with activated carbon (AC) as the positive one. First, the Mn3O4-G composite is prepared via a hydrothermal approach using commercially available graphene nanosheets. Li-storage studies of both electrodes (AC and Mn3O4-G) are conducted in single electrode/half-cell configuration with metallic Li to assess the mass balance. Prior to the fabrication of LICs, Mn3O4-G is pre-lithiated in Swagelok fittings with Li and subsequently paired with the desired loading of AC. The AC/Mn3O4-G based LIC delivered a maximum energy density of ∼142 W h kg−1 with excellent cyclability of 9000 cycles with ∼80% retention. This result certainly provides new avenues for the development of high energy LICs using conversion type negative electrodes rather than traditional insertion type anodes.