【作者】 姜巍； 姜鲁华； 孙海； 孙公权；

【Author】 Wei Jiang;Luhua Jiang;Hai Sun;Gongquan Sun;Dalian Institute of Chemical Physics,Dalian National Laboratory for Clean Energy,Chinese Academy of Sciences;

【机构】 中国科学院大连化学物理研究所大连洁净能源国家实验室(筹)燃料电池研究部；

【摘要】 镁离子二次电池具有理论比容量高(2200 mAh g^-1)、安全性好、镁储量丰富等优势^[1],近年来成为二次电池领域研究热点之一。然而,Mg²⁺离子所负电荷数较多,溶剂化较为严重,因而较难嵌入到一般的基质材料中,开发可逆嵌入/脱嵌Mg²⁺离子的高比容量正极材料具有很大的挑战性^[2]。文献中报道Dai等人^[3]利用具有大孔的泡沫碳为正极材料,构筑了循环性能达7500次的铝离子二次电池,然而其容量仅为70 mAh mg^-1,因此构建更高比表面、更大的内部空间的新型纳米结构正极材料以容纳更多离子的脱嵌是提高镁离子二次电池实际比容量的关键。本工作制备并考察了一系列活性碳、异质元素掺杂氧化石墨、多壁碳纳米管等碳材料作为镁离子二次电池正极材料,对比研究了不同结构以及不同异质元素掺杂的碳材料比容量和循环性能,提出镁在碳材料表面的沉积规律。更多还原

【Abstract】 Magnesium-ion rechargeable battery is of merits,such as high capacity(2200 mAh g^-1),safety,and abundant reserves,and thus is emerging as one of the research hotspots in the field of rechargeable battery.However,Mg²⁺ions are hard to intercalate the common cathodic materials due to serious salvation.To develop cathodic materials with high capacity and fast intercalation and deintercalation of Mg²⁺ ions is extremely necessary and full of challenge.It was reported that Dai et al.fabricated a Al³⁺ ion rechargeable battery of good recycling property,employing carbon foam as the cathode,however,the capacity was as low as 70 mAh mg^-1.To explore cathodic materials of high surface area and large interior space to hold more Mg²⁺ ions is crucial for this type of batteries.In this presentation,we investigated a series of carbon materials,including active carbon,hetero-element doped graphite and multi-wall carbon nanotubes,as cathode materials,and compared their specific capacity and reversible ability,proposed the deposition behavior of magnesium on carbon materials.更多还原