Large-Scale Fabrication of Graphene-like Carbon Nanospheres for Lithium Ion Battery Application
Large-Scale Fabrication of Graphene-like Carbon Nanospheres for Lithium Ion Battery Application
复制标题
大规模制造用于锂离子电池的类石墨烯碳纳米球
DOI：
10.1016/j.electacta.2016.09.125
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发表时间：
2016
影响因子：
6.6
通讯作者：
Huang Fuqiang
中科院分区：
文献类型：
--
作者：
Ding Wei;Xu Li;Chen Xin;Han Yu;Liu Shuangyu;Sheng Peng;Wang Bo;Zhao Guangyao;Bi Hui;Huang Fuqiang
以乙炔为碳源，采用直流电弧放电法制备了类石墨烯碳纳米球（GCNSs）。采用场发射扫描电子显微镜、高分辨透射电子显微镜、拉曼光谱、X射线衍射和氮吸附等手段对产物的形貌和结构进行了表征。GCNSs由高纯度和高质量的准球形同心石墨壳层组成，其尺寸分布在30-50 nm范围内。高品质的GCNSs还表现出高达30.3 S cm-1的高电导率，并且与常规炭黑（CB）相比，可以用作导电剂以显著改善LiFePO 4（LFP）阴极的电化学性能。LFP（GCNSs）阴极在0.1 C下的放电容量达到155.6 mAh g− 1，略高于LFP（CB）。然而，LFP（GCNSs）阴极在1 C和10 C倍率下仍分别提供114.9 mAh g− 1和65.2 mAh g− 1的高容量，远高于LFP（CB）。同时，在1 C和5 C放电倍率下，首次放电容量分别达到114.9 mAh g-1和80.9 mAh g-1，循环100次后容量分别下降到108.5 mAh g-1和79.9 mAh g-1。这表明优异的循环稳定性，特别是在高速率充电/放电循环下。因此，大规模生产、高结晶性和高导电性使GCNSs在能量转换和储存方面具有应用前景。
Large scale preparation of graphene-like carbon nanospheres (GCNSs) was performed by direct-current arc discharge using C2H2as carbon resources. The morphology and structure of the obtained products were investigated by field-emission scanning electron microscope, high-resolution transmission electron microscope, Raman spectroscope, X-ray diffraction and nitrogen adsorption. The GCNSs consist of quasi-spherically concentric graphitic shells with high purity and quality, and its size distribution is in the range of 30–50 nm. The high-quality GCNSs also exhibit highly electrical conductivity of ∼30.3 S cm−1, and can act as conductive agent to significantly improve the electrochemical performance of LiFePO4(LFP) cathode, compared with the conventional carbon black (CB). Discharge capacity of the LFP (GCNSs) cathode reaches up to 155.6 mAh g−1at 0.1 C, which is slightly higher than that of the LFP (CB). However, The LFP (GCNSs) cathode still delivers high capacities of 114.9 mAh g−1and 65.2 mAh g−1at 1 C and 10 C rates, respectively, which are much higher than those of the LFP (CB). At the same time, the discharge capacities reach up to 114.9 mAh g−1and 80.9 mAh g−1at 1 C and 5 C discharge rates for the first discharge, and the corresponding capacities decrease down to 108.5 mAh g−1and 79.9 mAh g−1after 100 cycles, respectively. This indicates excellent cyclic stability, especially at high rate charge/discharge cycles. Thus, the mass production, high crystalline and highly electrical conductivity may make the GCNSs find applications in energy conversion and storage.