24小时热门版块排行榜

返回列表

本帖产生 1 个翻译EPI ，点击这里进行查看

当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖

哟哟william

木虫 (小有名气)

应助: 0 (幼儿园)
金币: 1784.9
帖子: 205
在线: 69.2小时
虫号: 1254368
注册: 2011-04-03
性别: GG
专业: 固体与表面物理化学

[求助] 小段英文翻译，求助。各路大神速来呀！！！

To understand the reason for the superior electrochemical performance
of the sulfur–carbon composite synthesized by the in
situ sulfur-deposition route, EIS measurements were carried out
with the coin cells. The Nyquist profiles of the pure sulfur and
sulfur–carbon composite cathodes and the equivalent circuits are
shown in Fig. 8. Re refers to the resistance of electrolyte, Rct refers
to the charge transfer resistance between the interfaces of carbon/
sulfur/electrolyte, Wo refers to the Warburg impedance, and
CPE refers to the constant phase element [23]. The resistance of
electrolyte was estimated from the intersection of the front end of
semicircles with the Z axis, which is similar for both the cathodes.
The diameter of the impedance semicircles is related to the charge
transfer resistance, which is a measure of the difficulty involved
for charges crossing the boundary between the electrode and electrolyte.
Before cycling, the sulfur–carbon composite cathode has
a slightly lower charge transfer resistance value than the pure sulfur
cathode, which is expected considering its higher first discharge
capacity compared to that of the pure sulfur cathode. The close contact
between the conductive carbon black and the insulating sulfur
lowers the resistance for electrons transferring across the interface
between them. In the subsequent cycles (1st, 25th, and 50th), the
charge-transfer resistance of the pure sulfur cathode grows much
larger than that found with the sulfur–carbon composite cathode.
The main reason for this is the porous structure of the cycled pure
sulfur cathode. Electrons passing across the boundary between conductive
carbon and active material are impeded by the irreversible
formation of the Li2S layer in the pores [10]. The EIS measurements
thus reveal that the sulfur–carbon composite cathode exhibits better
electronic conductivity and lithium-ion transport than the pure
sulfur cathode due to the stable network structure of carbon black
wrapping around the sulfur. The impedance of the sulfur–carbon
composite after 50th cycles does not increase much, suggesting that
the network structure maintains its integrity during the cycling
process.

回复此楼