Unusual Formation of ZnCo2O4 3D Hierarchical Twin Microspheres as a High-Rate and Ultralong-Life Lithium-Ion Battery Anode Material
Unusual Formation of ZnCo2O4 3D Hierarchical Twin Microspheres as a High-Rate and Ultralong-Life Lithium-Ion Battery Anode Material
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ZnCo2O4 3D多级孪生微球的异常形成作为高倍率和超长寿命的锂离子电池负极材料
DOI：
10.1002/adfm.201303442
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发表时间：
2014-05-01
影响因子：
19
通讯作者：
Xiong, Shenglin
中科院分区：
文献类型：
--
作者：
Bai, Jing;Li, Xiaogang;Xiong, Shenglin
一个简单的两步策略，包括多元醇的方法和随后的热退火处理，成功地开发了大规模制备ZnCo 2 O 4各种层次的微/纳米结构（双微球和微立方体）没有表面活性剂的援助。据我们所知，这是第一次报道的ZnCo 2 O 4介孔双微球和微立方体的合成。更重要的是，基于反应时间对前驱体形貌演化的影响，首次提出了一种全新的晶体生长机制，即伴随形貌和相变化的多步分裂-原位溶解再结晶，来理解三维孪晶微球的形成，为研究新型微/纳米结构的形成提供了新的研究机会。当作为锂离子电池（LIB）的负极材料进行评价时，ZnCo 2 O 4分级微结构表现出上级容量保持率，在5 A g-1速率下2000次循环的优异循环稳定性。令人惊讶的是，ZnCo 2 O 4双微球显示出非常高的倍率性能高达10 A g-1的倍率。应该注意的是，在如此高的充电/放电速率下的超高速率性能和循环稳定性显著高于先前报道的关于ZnCo 2 O 4微米/纳米结构和ZnCo 2 O 4基异质结构的大多数工作。ZnCo 2 O 4三维分级微/纳米结构显示出作为高性能LIB负极材料的巨大潜力。
A facile two-step strategy involving a polyol method and subsequent thermal annealing treatment is successfully developed for the large-scale preparation of ZnCo2O4 various hierarchical micro/nanostructures (twin mcrospheres and microcubes) without surfactant assistance. To the best of our knowledge, this is the first report on the synthesis of ZnCo2O4 mesoporous twin microspheres and microcubes. More significantly, based on the effect of the reaction time on the morphology evolution of the precursor, a brand-new crystal growth mechanism, multistep splitting then in situ dissolution recrystallization accompanied by morphology and phase change, is first proposed to understand the formation of the 3D twin microshperes, providing new research opportunity for investigating the formation of novel micro/nanostructures. When evaluated as anode materials for lithium-ion batteries (LIBs), ZnCo2O4 hierarchical microstructures exhibit superior capacity retention, excellent cycling stability at the 5 A g-1 rate for 2000 cycles. Surprisingly, the ZnCo2O4 twin microspheres show an exceptionally high rate capability up to the 10 A g-1 rate. It should be noted that such super-high rate performance and cycling stability at such high charge/discharge rates are significantly higher than most work previously reported on ZnCo2O4 micro/nanostructures and ZnCo2O4-based heterostructures. The ZnCo2O4 3D hierarchical micro/nanostructures demonstrate the great potential as negative electrode materials for high-performance LIBs.