http://pubs.acs.org/doi/abs/10.1021/acsenergylett.6b00582

Interconnected Ni(HCO3)2 Hollow Spheres Enabled by Self-Sacrificial Templating with Enhanced Lithium Storage Properties

Shiqiang Zhao, Zewei Wang, Yanjie He, Beibei Jiang, Yeuwei Harn, Xueqin Liu, Faqi Yu, Fan Feng, Qiang Shen*, and Zhiqun Lin*

Key Laboratory for Colloid and Interface Chemistry of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China

School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States

Interconnectednickel bicarbonate (Ni(HCO₃)₂) hollow spheres were produced and exploited for the first time as an anode of lithiumion batteries, delivering the 80^th reversible capacityof 1442 mAh g^-1at the current rate of 100 mAg^-1 which is 3.9 times the theoretical capacityof commercial anode graphite. The time-dependent study suggested a self-sacrificialtemplating formation mechanism that yielded such intriguing interconnectedhollow structures. X-ray photoelectron spectroscopy(XPS) measurements on cycled electrodes indicated thatboth the deep oxidation of Ni²⁺ into Ni³⁺ and thereversible reactions in HCO₃^- accounted for the ultrahighcapacity of Ni(HCO₃)₂in comparison to its generally accepted theoretical capacity of 297 mAh g^-1. Morphological characterizations revealedthat the interconnected hollow structures enabled the enhancedrate performance and cycling stability due to their large contact areas with electrolyte andbetter buffering effect to accommodate the volume change compared to the solidcounterpart.

文章PDF:

Ni(HCO3)2 for LIB-MS-ACS Energy Lett., 2017, 2, pp 111–116.pdf

Ni(HCO3)2 for LIB-SI-ACS Energy Lett., 2017, 2, pp 111–116.pdf