Kinetic investigation of sulfurized polyacrylonitrile cathode material by electrochemical impedance spectroscopy

2011 ◽  
Vol 56 (14) ◽  
pp. 5252-5256 ◽  
Author(s):  
Li Wang ◽  
Jishi Zhao ◽  
Xiangming He ◽  
Chunrong Wan
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Cathode Material ◽  
Electrochemical Impedance ◽  
Kinetic Investigation

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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