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寒潭无影

新虫 (小有名气)


[交流] PVP在制备锂硫电池电极材料里做分散剂,提高了电池性能

PVP通常会用于表面活性剂或者分散剂,有助于分散获得更小粒径的纳米材料。这篇论文采用PVP分散硫化锂和炭黑的体系,使得两者可以结合,并且相互有良好分散性。直接上摘要~~~

The lithium−sulfur (Li−S) battery is a great alternative to the state-of-the-art lithium ion batteries due to its high energy density. However, low utilization of active materials, the insulating nature of sulfur or lithium sulfide (Li2S), and polysulfide dissolution in organic liquid electrolyte lead to low initial capacity and fast performance degradation. Herein, we propose a facile and viable approach to address these issues. This new approach entails synthesis of Li2S/carbon black (Li2S/CB) cores encapsulated by a nitrogendoped carbon shell with polyvinylpyrrolidone (PVP) assistance. Combining energy-filtered transmission electron microscopy (EFTEM) elemental mappings, XPS and FTIR measurements, it is confirmed that the as-synthesized material has a structure of a Li2S/CB core with a nitrogen-doped carbon shell (denoted as Li2S/CB@
NC). The Li2S/CB@NC cathode yields an exceptionally high initial capacity of 1020 mAh/g based on Li2S mass at 0.1 C with stable Coulombic efficiency of 99.7% over 200 cycles. Also, cycling performance shows the capacity decay per cycle as small as 0.17%. Most importantly, to further understand the materials for battery applications, field emission transmission electron microscopy (FETEM) and elemental mapping tests without exposure to air for Li2S samples in cycled cells are reported. Along with the first ever FETEM and field emission scanning electron microscopy (FESEM) investigations of cycled batteries, Li2S/CB@NC cathode demonstrates the capability of robust core−shell
nanostructures for different rates and improved capacity retention, revealing Li2S/CB@NC designed here as an outstanding system for high-performance lithium−sulfur batteries.
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三价铁离子

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6楼2016-02-29 12:55:31
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billie113

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liguohaoc

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25楼2016-02-29 13:33:42
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wangkez

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支持一下^_^
27楼2016-02-29 13:42:14
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332423

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希望有用吧,还是祝福一下

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32楼2016-02-29 14:54:17
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1263121482

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33楼2016-10-14 16:37:07
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amatetsai

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小木虫: 金币+0.5, 给个红包,谢谢回帖
感谢楼主好样的∩_∩

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35楼2017-06-30 06:49:19
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简单回复
2016-02-29 12:30   回复  
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祝福
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祝福
nono20094楼
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2016-02-29 13:01   回复  
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2016-02-29 13:03   回复  
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感谢分享 发自小木虫Android客户端
Sammy210楼
2016-02-29 13:04   回复  
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yanlangw13楼
2016-02-29 13:08   回复  
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支持
jeangong14楼
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douwangj15楼
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a
renqingyao17楼
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祝福
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yukaiv19楼
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祝福
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祝福 发自小木虫IOS客户端
shwkfd21楼
2016-02-29 13:24   回复  
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祝福 发自小木虫IOS客户端
amberblue22楼
2016-02-29 13:26   回复  
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2016-02-29 13:33   回复  
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支持 发自小木虫Android客户端
duanhek26楼
2016-02-29 13:36   回复  
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祝福
yejinshi28楼
2016-02-29 13:42   回复  
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2016-02-29 13:42   回复  
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祝福 发自小木虫IOS客户端
feinuanx30楼
2016-02-29 13:51   回复  
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支持
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2017-06-26 11:32   回复  
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