Key Laboratory of Automobile Materials, Ministry of Education, and College of Materials Science and Engineering, Jilin University, Changchun 130022, China.
Dalton Trans. 2018 Oct 23;47(41):14540-14548. doi: 10.1039/c8dt03148g.
With the depletion of fossil energy and rapid development of electronic equipment, the commercial lithium-ion batteries (LIBs) do not meet the current energy demand. There is an urgent need to develop novel LIBs with high capacity, long life, and low cost. In this work, we design and synthesize a MnCo2O4@NC@MnO2 three-layered core-shell octahedron with good electrochemical performance using binary transition metal oxide (MnCo2O4), N-doped carbon (NC), and high-capacity manganese oxide (MnO2). The three-layered structure is effective in relieving the volume expansion, improving the electronic conductivity, and strengthening the structural stability. The MnCo2O4@NC@MnO2 three-layered core-shell octahedron displays a high discharge capacity of 894 mA h g-1 at a current density of 500 mA g-1 after 120 cycles. Even at a high current density of 1000 mA g-1, the discharge capacity remains at 839 mA h g-1 after 600 cycles. Furthermore, this material possesses pretty good rate performance. All the results show that this ternary composite is a good anode alternative for lithium storage.
随着化石能源的枯竭和电子设备的快速发展，商业锂离子电池（LIBs）无法满足当前的能源需求。因此，迫切需要开发具有高容量、长寿命和低成本的新型 LIBs。在这项工作中，我们使用二元过渡金属氧化物（MnCo2O4）、氮掺杂碳（NC）和高容量的氧化锰（MnO2），设计并合成了具有良好电化学性能的 MnCo2O4@NC@MnO2 三层核壳八面体。这种三层结构可以有效缓解体积膨胀、提高电子导电性和增强结构稳定性。MnCo2O4@NC@MnO2 三层核壳八面体在 500 mA g-1 的电流密度下循环 120 次后，具有 894 mA h g-1 的高放电容量。即使在 1000 mA g-1 的高电流密度下，经过 600 次循环后，其放电容量仍保持在 839 mA h g-1。此外，该材料还具有良好的倍率性能。所有结果表明，这种三元复合材料是一种很有前途的锂离子存储用的负极替代材料。
