Electrochemical performance of single crystal belt-like NH4V3O8 as cathode material for lithium-ion batteries
Electrochemical performance of single crystal belt-like NH4V3O8 as cathode material for lithium-ion batteries
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DOI：
10.1016/j.electacta.2015.06.027
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发表时间：
2015-08-20
影响因子：
6.6
通讯作者：
Klingeler, R.
中科院分区：
文献类型：
--
作者：
Ottmann, A.;Zakharova, G. S.;Klingeler, R.
以乙酸为酸化剂，采用水热法合成了具有带状形貌的NH 4V 3 O 8。所得的纯相NH 4 V 3 O 8微晶具有光滑的表面，并且通常为25-45 μ m长、2-15 μ m宽和0.6-1.2 μ m厚。通过循环伏安法和恒电流循环的电化学研究表明，原始材料是可逆Li+脱/嵌入的合适宿主。通过Randles-Sevcik方程对循环伏安法的峰电流进行分析表明，Li+脱嵌/嵌入是扩散控制的，D类似于5.10（-15）cm（2）s（-1）。在20 mAg（-1）下的最大放电容量为299 mA h g（-1）。在90 mA g（-1）下，其100次循环的容量保持率为90%，仍为201 mA hg（-1），表明带状NH_4V_3O_8是一种很有前途的锂离子二次电池正极材料。(C)2015爱思唯尔有限公司版权所有。
NH4V3O8 with belt-like morphology has been synthesized via a hydrothermal process, using acetic acid as acidulant. The resulting phase-pure NH4V3O8 microcrystals have smooth surfaces and are typically 25-45 mu m long, 2-15 mu m wide, and 0.6-1.2 mu m thick. Electrochemical studies by means of cyclic voltammetry and galvanostatic cycling show that the pristine material is a suitable host for reversible Li+ de-/intercalation. Analysis of the peak currents from cyclic voltammetry by means of the Randles-Sevcik equation suggests that the Li+ de-/intercalation is diffusion-controlled with D similar to 5.10(-15) cm(2)s(-1). The maximum discharge capacity, at 20 mAg(-1), amounts to 299 mA h g(-1). At 90 mA g(-1), it is still 201 mA hg(-1) with a capacity retention of 90% in the 100th cycle, indicating the belt-like NH4V3O8 being a promising candidate for application as cathode material in secondary lithium-ion batteries. (C) 2015 Elsevier Ltd. All rights reserved.