Division of Energy Storage, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China.
Dalton Trans. 2018 Jun 12;47(23):7739-7746. doi: 10.1039/c8dt00910d.
The low specific capacity of graphite limits the further increase of the energy density of lithium-ion batteries and their widespread applications. Exploring new anode materials is the key issue. Herein, a new mullite-type compound Bi2Mn4O10 is designed and synthesized. The Bi2Mn4O10/C composite delivers a high reversible specific capacity of 846 mA h g-1 (more than twice that of graphite), and exhibits a high capacity retention of 100% after 300 cycles at 600 mA g-1, which is reported for the first time. The high specific capacity originates from the combination of the conversion reaction and alloying-dealloying reaction, which has been confirmed by the ex situ XRD, IR, SEM and TEM studies. In addition, the unique nanocomposite generated during the charge-discharge process provides excellent cycling stability. This work proves that Bi2Mn4O10/C is a potential anode material for advanced lithium-ion batteries.
石墨的比容量低限制了锂离子电池能量密度的进一步提高及其广泛应用。探索新的阳极材料是关键问题。本文设计并合成了一种新型莫来石型化合物 Bi2Mn4O10。Bi2Mn4O10/C 复合材料提供了 846 mA h g-1 的高可逆比容量（是石墨的两倍以上），在 600 mA g-1 下循环 300 次后容量保持率为 100%，这是首次报道。高比容量源于转化反应和固溶体-脱溶反应的结合，这已通过原位 XRD、IR、SEM 和 TEM 研究得到证实。此外，在充放电过程中产生的独特纳米复合材料提供了优异的循环稳定性。这项工作证明 Bi2Mn4O10/C 是先进锂离子电池的一种有潜力的阳极材料。
