Electrochemical properties of graphitic carbon nitrides
Electrochemical properties of graphitic carbon nitrides
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DOI：
10.1504/ijnt.2014.063784
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发表时间：
2014-07
影响因子：
0.5
通讯作者：
A. B. Jorge;F. Corà;A. Sella;P. McMillan;D. Brett
中科院分区：
文献类型：
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作者：
A. B. Jorge;F. Corà;A. Sella;P. McMillan;D. Brett
锂离子电池（LIB）是目前便携式储能应用的首选设备;然而，需要提高能量和功率密度，以支持未来更苛刻的任务，例如与汽车运输相关的任务。在商业上，LIB阳极通常由石墨碳基系统制成，其存在与表面钝化和缓慢嵌入动力学相关的瓶颈。我们已经研究了层状/石墨碳氮化物（gCNMs）作为替代阳极材料;它们独特的结构和化学特性使纯C石墨无法实现的新插层过程成为可能。我们的gCNMs由在不同温度下处理的含C，N的前体制备。循环伏安法显示在0.5- 1.5V范围内的清楚的氧化/还原循环，表明发生Li +嵌入，导致先前半导体材料的导电性质。较高的反应温度导致石墨层的弯曲和随之而来的平面性损失，对它们的电化学性能具有负面影响。
Lithium-ion batteries (LIBs) are the current devices of choice for portable energy storage applications; however, improvements in energy and power densities are required to sustain future more demanding tasks, such as those associated with automotive transport. Commercially, LIB anodes are typically made from graphitic carbon-based systems that present bottlenecks associated with surface passivation and slow intercalation kinetics. We have investigated layered/graphitic carbon nitrides (gCNMs) as alternative anode materials; their unique structure and chemistry enable new intercalation processes not available for pure-C graphite. Our gCNMs are prepared from C, N-containing precursors treated at different temperatures. Cyclic voltammetry showed clear oxidation/reduction cycles in the 0.5–1.5 V range indicating that Li + intercalation took place resulting in electric conduction properties of the previously semiconducting material. Higher reaction temperatures lead to buckling of the graphitic layers and consequent loss of planarity, with a negative effect on their electrochemical performance.