Electrochemical and structural study of layered P2-type Na(2/3)Ni(1/3)Mn(2/3)O2 as cathode material for sodium-ion battery.
Electrochemical and structural study of layered P2-type Na(2/3)Ni(1/3)Mn(2/3)O2 as cathode material for sodium-ion battery.
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DOI：
10.1002/asia.201403134
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发表时间：
2015-03
期刊：
影响因子：
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通讯作者：
Yanfen Wen;Bei Wang;G. Zeng;K. Nogita;D. Ye;Lianzhou Wang
中科院分区：
文献类型：
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作者：
Yanfen Wen;Bei Wang;G. Zeng;K. Nogita;D. Ye;Lianzhou Wang
采用控制共沉淀法和高温固相反应合成了P2型Na（2/3）Ni（1/3）Mn（2/3）O2，并将其用作钠离子电池（SIB）正极材料。在1.5- 3.75V（相对于Na（+）/Na）电压范围内，首次放电容量达到151.8mA·h·g（-1）。充放电50次后，放电容量为123.5mA·h·g（-1），约为初始放电容量的81.4%。原位X射线衍射分析表明，P2-Na（2/3）Ni（1/3）Mn（2/3）O2在循环过程中发生了可逆的结构变化，没有出现O2-Ni（1/3）Mn（2/3）O2相，这对设计稳定、高性能的SIB正极材料具有重要意义。
P2-type Na(2/3)Ni(1/3)Mn(2/3)O2 was synthesized by a controlled co-precipitation method followed by a high-temperature solid-state reaction and was used as a cathode material for a sodium-ion battery (SIB). The electrochemical behavior of this layered material was studied and an initial discharge capacity of 151.8 mA h g(-1) was achieved in the voltage range of 1.5-3.75 V versus Na(+)/Na. The retained discharge capacity was found to be 123.5 mA h g(-1) after charging/discharging 50 cycles, approximately 81.4% of the initial discharge capacity. In situ X-ray diffraction analysis was used to investigate the sodium insertion and extraction mechanism and clearly revealed the reversible structural changes of the P2-Na(2/3)Ni(1/3)Mn(2/3)O2 and no emergence of the O2-Ni(1/3)Mn(2/3)O2 phase during the cycling test, which is important for designing stable and high-performance SIB cathode materials.