Superior full-cell cycling and rate performance achieved by carbon coated hollow Fe3O4 nanoellipsoids for lithium ion battery
Superior full-cell cycling and rate performance achieved by carbon coated hollow Fe3O4 nanoellipsoids for lithium ion battery
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用于锂离子电池的碳包覆空心 Fe3O4 纳米椭球体实现卓越的全电池循环和倍率性能
DOI：
10.1016/j.electacta.2018.08.060
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发表时间：
2018-10
影响因子：
6.6
通讯作者：
Ning Xiao-Hui
中科院分区：
文献类型：
--
作者：
Sun Liu Yang;Yang Lie;Li Jing;Narayan R. Lakshmi;Ning Xiao-Hui
氧化铁是一种很有前途的锂离子电池负极材料，具有较高的理论比容量，但循环性能和倍率性能较差。为了解决这些问题，本研究设计了150 纳米碳包覆的中空Fe3O4纳米椭球。由于Fe3O4的利用率较高以及碳层提供的缓冲作用，该复合材料具有较高的锂离子储存性能和较长的循环寿命。通过半电池测试发现，即使在5 A−g 1下循环1000次，容量仍超过400 g−1。然后，采用一种简单实用的策略来获得较高的压缩密度(∼1.87 g cm−3)，因此可以通过压缩进一步提高Fe3O4@C电极的体积容量。在全电池测试中，Fe3O4@C电极100次循环后的比容量为400mAhg 1，体积容量为749mAhcm−3。循环稳定性的提高可以归因于最小的体积膨胀和固体-电解质界面层(SEI)在纳米颗粒上的稳定性。最后，对固体-电解质界面层的演化进行了间接监测，并定量测量了活性锂的逐级损失。
Iron oxide, a promising anode material for lithium ion batteries, has a high theoretical specific capacity but exhibits poor cycling performance and rate capability. To resolve these issues, 150 nm sized carbon coated, hollow Fe3O4nanoellipsoids are designed in this study. Owing to the relatively high utilization ratio of Fe3O4and the buffer provided by the carbon layer, this composite has enhanced lithium ion storage properties and long cycle life. From half-cell measurements, the capacity is found to be in excess of 400 mAh g−1even after 1000 cycles at 5 A g−1. And then, a facile and practical strategy is used to gain a relatively high compressed density (∼1.87 g cm−3), so the volumetric capacity of the Fe3O4@C electrode can be further enhanced by subjecting it to compression. In the full cell test, the Fe3O4@C electrode has a specific capacity of 400 mAh g−1and volumetric capacity of 749 mAh cm−3after 100 cycles. The improvement in cycling stability can be attributed to minimal volume expansion and the stability of the solid-electrolyte interphase (SEI) layer, over the nanoparticles. Finally, the evolution of solid-electrolyte interphase layer is indirectly monitored and the progressive loss of active lithium is quantitatively measured.
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作者：
D. Jagadeesan;Uzma Mansoori;P. Mandal;A. Sundaresan;M. Eswaramoorthy
通讯作者：
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影响因子：
10.8
作者：
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通讯作者：
Zhi, Linjie
影响因子：
3.1
作者：
Lisha Shen;Huawei Song;H. Cui;X. Wen;Xiaolin Wei;Chengxin Wang
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