Cu-doped layered P2-type Na0.67Ni0.33-xCuxMn0.67O2 cathode electrode material with enhanced electrochemical performance for sodium-ion batteries
Cu-doped layered P2-type Na0.67Ni0.33-xCuxMn0.67O2 cathode electrode material with enhanced electrochemical performance for sodium-ion batteries
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Cu掺杂层状P2型Na0.67Ni0.33-xCuxMn0.67O2增强钠离子电池电化学性能的正极材料
DOI：
10.1016/j.cej.2020.126578
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发表时间：
2021-01
影响因子：
15.1
通讯作者：
Fei Teng
中科院分区：
文献类型：
--
作者：
Liu Yang;Shao-hua Luo;Yafeng Wang;Yang Zhan;Qing Wang;Yahui Zhang;Xin Liu;Wenning Mu;Fei Teng
采用简便的固相方法制备了一系列Cu掺杂层状P2型Na0.67Ni0.33-xCuxMn0.67O2 (x = 0、0.05、0.10、0.15、0.20、0.33)，并作为钠离子电池正极材料进行了研究。通过X射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）技术检查了正极材料的微观结构和形貌。对Na0.67Ni0.33-xCuxMn0.67O2样品的电化学特性进行了系统研究，通过引入电化学活性Cu2+离子作为取代基，该样品表现出良好的容量保持率、循环稳定性和倍率性能。当x=0.15时，样品在2-4.3 V电压范围内0.1 C首次放电容量为120 mAh g(-1)，200次循环后容量保持率为78%，在20 C高电流倍率下可逆容量为62 mAh g(-1)。与原始化合物相比，电化学性能的增强可归因于插入过渡金属的Cu2+ (TM) 层，在充电至高电压时稳定 P2 相结构，防止 P2-O2 相变。同时，铜的存在也有助于基于Cu2+/Cu3+氧化还原反应的可逆容量。该策略可以通过增强TM层之间的稳定性来提高循环性能和倍率性能。
A series of Cu-doped layered P2-type Na0.67Ni0.33-xCuxMn0.67O2 (x = 0, 0.05, 0.10, 0.15, 0.20, 0.33) were fabricated using a convenient solid-state method and studied as cathode materials for sodium-ion batteries. The microstructure and morphology of the cathode materials were examined by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM) techniques. The electrochemical characteristics of Na0.67Ni0.33-xCuxMn0.67O2 samples have been investigated systematically and it shows good capacity retention, cycling stability and rate performance by introducing electrochemically active Cu2+ ions as substituents. When x = 0.15, the sample delivers an initial discharge capacity of 120 mAh g(-1) at 0.1 C in the voltage range 2-4.3 V with a capacity retention of 78% after 200 cycles, and a reversible capacity of 62 mAh g(-1) can be obtained at a high current rate of 20 C. Compared with the pristine compound, the enhanced electrochemical performance can be attributed to the Cu2+ inserted into the transition metal (TM) layer, which stabilizes the P2-phase structure against P2-O2 phase transition when charging to high voltage. Meanwhile, the presence of copper also contributes to the reversible capacity based on the Cu2+/Cu3+ redox reaction. This strategy can improve the cyclability and rate performance by enhancing the stability between TM layers.
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影响因子：
3.7
作者：
Qiu, Jingxia;Li, Sheng;Zhang, Shanqing
通讯作者：
Zhang, Shanqing
影响因子：
3.2
作者：
DELMAS, C;BRACONNIER, JJ;HAGENMULLER, P
通讯作者：
HAGENMULLER, P
DOI：
10.1002/asia.201403134
发表时间：
2015-03
期刊：
Chemistry, an Asian journal
影响因子：
--
作者：
Yanfen Wen;Bei Wang;G. Zeng;K. Nogita;D. Ye;Lianzhou Wang
通讯作者：
Yanfen Wen;Bei Wang;G. Zeng;K. Nogita;D. Ye;Lianzhou Wang
影响因子：
27.8
作者：
Hasa, Ivana;Buchholz, Daniel;Hassoun, Jusef
通讯作者：
Hassoun, Jusef
影响因子：
3
作者：
Ling Wu;Shengkui Zhong;Jiajia Lu;Fan Lv;Jie-qun Liu
通讯作者：
Ling Wu;Shengkui Zhong;Jiajia Lu;Fan Lv;Jie-qun Liu