Highly Porous Mn3O4 Micro/Nanocuboids with In Situ Coated Carbon as Advanced Anode Material for Lithium-Ion Batteries
Highly Porous Mn3O4 Micro/Nanocuboids with In Situ Coated Carbon as Advanced Anode Material for Lithium-Ion Batteries
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具有原位涂层碳的高孔 Mn3O4 微/纳米立方体作为锂离子电池的先进负极材料
DOI：
10.1002/smll.201704296
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发表时间：
2018-05-09
期刊：
影响因子：
13.3
通讯作者：
Xia, Hui
中科院分区：
文献类型：
--
作者：
Jiang, Yao;Yue, Ji-Li;Xia, Hui
大多数过渡金属氧化物基于转化机理的电化学性能受到循环稳定性差、倍率性能差、严重的不可逆反应导致的高过电位、低电导率和差离子扩散性的极大限制。为了解决这些问题，设计并通过一锅水热法合成了具有原位形成碳基质的高多孔Mn 3 O 4微/纳米立方体（简称Mn3O4@C微/纳米立方体），其中葡萄糖同时充当还原剂和碳源。复合材料中的碳含量、颗粒尺寸和孔结构可以容易地控制，从而导致在长方体中具有丰富孔的连续碳基体。所制备的Mn3O4@C微/纳米立方体表现出大的可逆比容量（在100 mA g（-1）的电流密度下为879 mAh g（-1））以及优异的循环稳定性（500次循环后86%的容量保持率）和倍率性能，使其成为锂离子电池负极材料的潜在候选者。此外，这种简单有效的合成策略可以进一步探索作为一种通用的方法，用于合成其他分级过渡金属氧化物和碳杂化物与微妙的结构工程。
The electrochemical performance of most transition metal oxides based on the conversion mechanism is greatly restricted by inferior cycling stability, rate capability, high overpotential induced by the serious irreversible reactions, low electrical conductivity, and poor ion diffusivity. To mitigate these problems, highly porous Mn3O4 micro/nanocuboids with in situ formed carbon matrix (denoted as Mn3O4@C micro/nanocuboids) are designed and synthesized via a one-pot hydrothermal method, in which glucose plays the roles of a reductive agent and a carbon source simultaneously. The carbon content, particle size, and pore structure in the composite can be facilely controlled, resulting in continuous carbon matrix with abundant pores in the cuboids. The as-fabricated Mn3O4@C micro/nanocuboids exhibit large reversible specific capacity (879 mAh g(-1) at the current density of 100 mA g(-1)) as well as outstanding cycling stability (86% capacity retention after 500 cycles) and rate capability, making it a potential candidate as anode material for lithium-ion batteries. Moreover, this facile and effective synthetic strategy can be further explored as a universal approach for the synthesis of other hierarchical transition metal oxides and carbon hybrids with subtle structure engineering.