Comparative studies on potential dependent electrochemical impedance spectroscopy of cathode material 0.5Li2MnO3·0.5LiNi0.5Mn0.5O2 for the initial two charging cycles

2015 ◽  
Vol 15 (2) ◽  
pp. 149-155 ◽  
Author(s):  
Chao Chen ◽  
Shu Chen ◽  
Miao Shui ◽  
Xiaoping Xu ◽  
Weidong Zheng ◽  
...  
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Cathode Material ◽  
Comparative Studies ◽  
Electrochemical Impedance

Significant Improvement of Electrochemical Performance of Ni-rich Cathode Material by Polyethylene Coating

2016 ◽  
Vol 19 (3) ◽  
pp. 157-161
Author(s):  
Byeong-Chan Jang ◽  
Jong-Tae Son
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Performance ◽  
Cathode Material ◽  
Discharge Capacity ◽  
Electrochemical Impedance ◽  
Initial Discharge Capacity ◽  
Coated Material ◽  
Initial Discharge ◽  
Polyethylene Coating

We attempted to use polyethylene (PE) to coat the surface of the cathode material in order to suppress these unnecessary reac-tion, and the results obtained via electrochemical impedance spectroscopy (EIS) suggest the growth of the SEI resistance and charge trans-fer resistance was suppressed in the samples consisting of 0.1 wt% PE-coated Li[(Ni0.6Co0.1Mn0.3)0.36(Ni0.80Co0.15Al0.05)0.64)]O2 (NCS). The initial discharge capacity of the coated material was of 190.56 mAhg-1 at 0.1 C between 3.0 and 4.3 V, and 94.6 % of this capacity was retained after 30 cycles. A notable of effect of the PE coating, is that the resulting exothermic temperature appears at approximately 258.1 °C, which is higher than that for bare NCS at 249.3 °C.

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