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jimmywhite419

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[交流] Nature com.上新出的锂硫电池文章,跟大家讨论分享一下 已有8人参与

Nature com.上新出的锂硫电池文章,跟大家讨论分享一下:
http://www.nature.com/ncomms/201 ... ull/ncomms9622.html

Encapsulation of sulfur with thin-layered nickel-based hydroxides for long-cyclic lithium–sulfur cells
Abstract:Elemental sulfur cathodes for lithium/sulfur cells are still in the stage of intensive research
due to their unsatisfactory capacity retention and cyclability. The undesired capacity
degradation upon cycling originates from gradual diffusion of lithium polysulfides out of the
cathode region. To prevent losses of certain intermediate soluble species and extend lifespan
of cells, the effective encapsulation of sulfur plays a critical role. Here we report an applicable
way, by using thin-layered nickel-based hydroxide as a feasible and effective encapsulation
material. In addition to being a durable physical barrier, such hydroxide thin films can
irreversibly react with lithium to generate protective layers that combine good ionic
permeability and abundant functional polar/hydrophilic groups, leading to drastic improvements
in cell behaviours (almost 100% coulombic efficiency and negligible capacity decay
within total 500 cycles). Our present encapsulation strategy and understanding of hydroxide
working mechanisms may advance progress on the development of lithium/sulfur cells for
practical use.

Nature com.上新出的锂硫电池文章,跟大家讨论分享一下
QQ图片20151017104712.png
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jimmywhite419

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引用回帖:
7楼: Originally posted by fantasia_13 at 2015-10-20 13:45:00
能不能具体说一下什么问题?
初涉锂硫
不胜感激...

正好我们可以讨论一下
细读之后,我觉得这个作者貌似陈述的是用氢氧化物做了一层膜防止硫流失。这个膜可与锂发生反应,生成物类似电极钝化膜起到稳定电极的作用。个人觉得哈,和以前提到的物理包敷有所不同。
8楼2015-10-20 21:13:13
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magicpopo

金虫 (著名写手)

电之炼金术士

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图3的a图,图4的b图
做过锂硫的简单算一下
3楼2015-10-17 14:33:25
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jimmywhite419

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引用回帖:
2楼: Originally posted by fdbxlq at 2015-10-17 14:15:21
讨论什么?

话说氢氧化物做壳层材料,用于锂电池电池体系是否合适?

[ 发自手机版 http://muchong.com/3g ]
4楼2015-10-17 16:08:38
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foolishmani

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感觉文章新意和数据都没有我最近的AEM好!NiOH不是典型的电容材料么?
5楼2015-10-18 08:03:22
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