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Enhanced electrochemical performances of LiNi0.8Co0.1Mn0.1O2 by synergistic modification of sodium ion doping and silica coating
Solid State Ionics ( IF 3.2 ) Pub Date : 2020-01-08 , DOI: 10.1016/j.ssi.2019.115214
Wei Zeng , Quanqi Chen , Yanwei Li , Chao Chen , Xueping Liu , Min Yuan , Renheng Wang , Shaojun Chen , Shunhua Xiao

LiNi0.8Co0.1Mn0.1O2 (LNCM811) is a promising cathode material for lithium ion batteries. However, it is difficult to commercialize on a large scale because of its unstable structure and fast capacity attenuation. To solve above problems, in this paper, the Na-doped LNCM811 material (LNCM811-Na) has been synthesized via hydrothermal method and high temperature solid phase method, and then it is coated with SiO2 ([email protected]2) on the basis of Na doping. The structure, composition, morphology, and microstructure of [email protected]2 are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Scanning electron microscope (SEM) and transmission electron microscope (TEM), respectively. The results show that the specific capacity of the LNCM811–[email protected]2(3%) sample reaches 209 mAh g1 at 0.5C (the LNCM811–0.1Na is 195 mAh g1 and the LNCM811 is 178 mAh g1). When the rate is increased to 10C, the specific capacity of the LNCM811–[email protected]2(3%) sample still reaches 115 mAh g1 (the LNCM811–0.1Na is 95 mAh g1 and the LNCM811 is 72 mAh g1). The results of cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) prove that Na doping and SiO2 coating can effectively reduce the polarization and the charge transfer impedance, further promote the improvement of electrochemical performance. Thus, the LNCM811–[email protected]2(3%) sample is a very promising material in power batteries.



中文翻译:

钠离子掺杂和二氧化硅涂层的协同改性增强LiNi 0.8 Co 0.1 Mn 0.1 O 2的电化学性能

LiNi 0.8 Co 0.1 Mn 0.1 O 2(LNCM811)是一种有前途的锂离子电池正极材料。但是,由于其结构不稳定和容量衰减快,难以大规模商业化。为了解决上述问题,本文通过水热法和高温固相法合成了掺Na的LNCM811材料(LNCM811-Na),然后在其上涂覆SiO 2([email protected] 2)。 Na掺杂的基础。[受电子邮件保护] 2的结构,组成,形态和微观结构分别由X射线衍射(XRD),X射线光电子能谱(XPS),扫描电子显微镜(SEM)和透射电子显微镜(TEM)表征。结果表明,LNCM811– [受电子邮件保护] 2(3%)样品的比容量在0.5C时达到209 mAh g 1(LNCM811–0.1Na为195 mAh g 1,LNCM811为178 mAh g 1)。当速率增加到10C时,LNCM811– [受电子邮件保护] 2(3%)样品的比容量仍然达到115 mAh g 1(LNCM811–0.1Na为95 mAh g 1而LNCM811为72 mAh g 1)。循环伏安法(CV)和电化学阻抗谱(EIS)的结果证明,Na掺杂和SiO 2涂层可以有效降低极化和电荷转移阻抗,进一步促进电化学性能的提高。因此,LNCM811– [受电子邮件保护] 2(3%)样品是动力电池中非常有前途的材料。

更新日期:2020-01-08
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