Pretreated precursor to realize dual modification that improves the high voltage electrochemical performance of LiNi0.8Co0.1Mn0.1O2 cathode materials
Pretreated precursor to realize dual modification that improves the high voltage electrochemical performance of LiNi0.8Co0.1Mn0.1O2 cathode materials
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预处理前驱体实现双重改性，提高LiNi0.8Co0.1Mn0.1O2正极材料的高电压电化学性能
DOI：
10.1016/j.jallcom.2020.158325
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发表时间：
2020-12
影响因子：
6.2
通讯作者：
Yijing Gu
中科院分区：
文献类型：
--
作者：
Ji;ong Zhang;Fuzhong Wu;Xinyi Dai;Yi Mai;Yijing Gu
富镍阴极以其令人满意的容量和低廉的成本得到了越来越多的研究。然而，富镍阴极在充放电过程中容量迅速衰减，限制了其实际应用。本工作以KMnO4为前驱体，在空气中合成了LiNi0.8Co0.1Mn0.1O2(NCM811)。产物具有多种形貌和结构表征，从而验证了该前处理能够成功地实现MnO2涂层和Mn4+掺杂的双重改性。电化学测试表明，经1.0wt%KMnO4处理的样品在3.0~4.5V范围内表现出良好的循环性能，0.2C下100次循环后的容量保持率达到79.15%，比空气中焙烧的纯样品(59.22%)和氧气中焙烧的纯样品(71.17%)具有更好的循环稳定性。此外，在抑制极化的同时，在1℃的大电流密度下，容量保持率达到82.27%。循环伏安和交流阻抗谱测试表明，预氧化降低了电极的电阻，抑制了不可逆相变。保护性的MnO2涂层抑制了活性物质与电解液之间的界面反应，而Mn4+掺杂改善了晶体结构。因此，经KMnO4处理的前驱体可以在空气中制备出在4.5 V处具有优异电化学性能的LiNi0.8Co0.1Mn0.1O2。
Ni-rich cathodes have been increasingly studied due to their satisfactory capacity and low cost. However, the rapid attenuation of capacity during charging and discharging Ni-rich cathodes limits their practical use. In this work, a KMnO4-pretreated precursor is used to synthesize LiNi0.8Co0.1Mn0.1O2(NCM811) in air. The product shows various morphological and structural characterizations, thereby verifying that the pretreatment can successfully achieve the dual modification of a MnO2coating and Mn4+doping. Electrochemical tests indicate that the 1.0 wt% KMnO4-pretreated sample exhibits superior cycling performance from 3.0 to 4.5 V. Additionally, the capacity retention rate after 100 cycles reaches 79.15% at 0.2 C, which shows that the pretreated sample has better cycling stability compared with the pure sample calcined in air (59.22%) and the pure sample calcined in oxygen (71.17%). In addition, the capacity retention reaches 82.27% at a high current density of 1 C while suppressing the potential polarization. Cyclic voltammetry and electrochemical impedance spectroscopy tests show that the pretreatment decreases the resistance and suppresses the irreversible phase transition. The protective MnO2coating inhibits the interfacial reactions between the active substance and electrolyte, while the Mn4+dopant improves the crystal structure. Therefore, it is concluded that LiNi0.8Co0.1Mn0.1O2, with a superior electrochemical performance at a high of 4.5 V, can be prepared through a KMnO4-pretreated precursor in air.
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