In-situ high loading of SnO2 monocrystals in a tridimensional carbon network via chemical bonding for enhanced lithium storage performance
In-situ high loading of SnO2 monocrystals in a tridimensional carbon network via chemical bonding for enhanced lithium storage performance
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通过化学键合在三维碳网络中原位高负载 SnO2 单晶，以增强锂存储性能
DOI：
10.1016/j.jallcom.2018.10.205
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发表时间：
2019-02
影响因子：
6.2
通讯作者：
Zhao Jianqing
中科院分区：
文献类型：
--
作者：
Shi Tong;Kuai Xiaoxiao;Zhu Wenchang;Tian Kai;Lu Hui;Huang Xue;Gao Lijun;Zhao Jianqing
平均粒径为~10nm的SnO2单晶被原位嵌入三维碳网络（标记为SnO2@C）中，负载百分比高达39.5wt%。讨论了SnO2@C纳米复合材料的合成机理。 X射线光电子能谱证明了SnO2纳米颗粒和碳骨架之间可能存在化学键合，从而增强了SnO2@C纳米复合材料作为锂离子电池阳极材料的锂存储性能。 SnO2@C负极材料在0.1 C下的初始充电容量为844mAh/g，在1 C（1 C=0.79 A/g）下经过700次电化学循环后仍能保持661mAh/g的比容量，与裸SnO2材料相比，循环性能和高倍率性能显着提高。根据CV循环中记录的1.10/1.25V的可逆氧化还原对，SnO2@C负极材料的高储锂容量可归因于与SnO还原为Sn以及相应的再氧化过程相关的电化学可逆性。 SnO2@C负极在高温下也表现出出色的循环稳定性，在1 C下125次循环后的剩余容量为512mAh/g，在5 Cat 55°C下300次循环后的剩余容量分别为233mAh/g。 TEM/HRTEM 图像显示了循环 SnO2@C 纳米复合材料的理想结构完整性和碳网络的稳健性，这对卓越的锂存储性能做出了重大贡献。
SnO2monocrystals with an average particle size of ∼10 nm have beenin-situembedded in a tridimensional carbon network (marked as SnO2@C) with a high loading percentage of 39.5 wt%. The synthetic mechanism of SnO2@C nanocomposite is discussed. The X-ray photoelectron spectroscopies demonstrate probable chemical bonding between SnO2nanoparticles and the carbon framework for enhanced lithium storage performance of SnO2@C nanocomposite as an anode material for lithium ion batteries. The SnO2@C anode material delivers an initial charge capacity of 844 mAh/g at 0.1 C, and can retain a specific capacity of 661 mAh/g after 700 electrochemical cycles at 1 C (1 C = 0.79 A/g), showing considerably improved cycling and high-rate performance as compared with the bare SnO2material. The high lithium storage capacity of SnO2@C anode material can be attributed to electrochemical reversibility related to the reduction of SnO to Sn and corresponding re-oxidation process, according to a reversible redox pair at 1.10/1.25 V recorded in CV cycles. The SnO2@C anode also reveals outstanding cycling stability at elevated temperature, resulting in a remaining capacity of 512 mAh/g after 125 cycles at 1 C and 233 mAh/g after 300 cycles at 5 C at 55 °C, respectively. TEM/HRTEM images show desirable structural integrity of cycled SnO2@C nanocomposite and the robustness of the carbon network, which significantly contributes to superior lithium storage performance.
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