Advanced rechargeable aluminium ion battery with a high-quality natural graphite cathode.
Advanced rechargeable aluminium ion battery with a high-quality natural graphite cathode.
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DOI：
10.1038/ncomms14283
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发表时间：
2017-02-13
影响因子：
16.6
通讯作者：
Dai H
中科院分区：
文献类型：
--
作者：
Wang DY;Wei CY;Lin MC;Pan CJ;Chou HL;Chen HA;Gong M;Wu Y;Yuan C;Angell M;Hsieh YJ;Chen YH;Wen CY;Chen CW;Hwang BJ;Chen CC;Dai H
近来，对具有铝阳极、石墨阴极和离子液体电解质的铝离子电池的兴趣已经增加;然而，仍有许多工作要做以增加阴极容量并理解阴离子-石墨插层机理的细节。在这里，使用原始天然石墨薄片制成的铝离子电池单元在99 mA g−1（0.9 C）的电流密度下实现了110 mAh g−1的比容量，库仑效率为198%，具有清晰的放电电压平台（2.25-2.0 V和1.9-1.5 V）。该电池在6 C下的容量为60 mAh g−1，超过6，000次循环，库仑效率为99%。拉曼光谱显示两种不同的嵌入过程涉及氯铝酸阴离子在两个放电平台，而C-Cl键合的表面上，或天然石墨的边缘，被发现使用X-射线吸收光谱。最后，理论计算研究了氯铝酸阴离子在石墨电极中的嵌入行为。可再充电铝离子电池是一类新兴的能量存储装置。在这里，作者揭示了高品质的天然石墨作为一个有前途的阴极铝离子电池，也确定氯铝酸阴离子嵌入石墨的拉曼光谱。
Recently, interest in aluminium ion batteries with aluminium anodes, graphite cathodes and ionic liquid electrolytes has increased; however, much remains to be done to increase the cathode capacity and to understand details of the anion–graphite intercalation mechanism. Here, an aluminium ion battery cell made using pristine natural graphite flakes achieves a specific capacity of ∼110 mAh g−1 with Coulombic efficiency ∼98%, at a current density of 99 mA g−1 (0.9 C) with clear discharge voltage plateaus (2.25–2.0 V and 1.9–1.5 V). The cell has a capacity of 60 mAh g−1 at 6 C, over 6,000 cycles with Coulombic efficiency ∼ 99%. Raman spectroscopy shows two different intercalation processes involving chloroaluminate anions at the two discharging plateaus, while C–Cl bonding on the surface, or edges of natural graphite, is found using X-ray absorption spectroscopy. Finally, theoretical calculations are employed to investigate the intercalation behaviour of choloraluminate anions in the graphite electrode. Rechargeable aluminium ion batteries are an emerging class of energy storage device. Here the authors reveal high-quality natural graphite as a promising cathode for Al-ion batteries, also identifying chloroaluminate anion intercalation in graphite by Raman spectroscopy.