Electrocatalysis of lithium polysulfides: current collectors as electrodes in Li/S battery configuration.
Electrocatalysis of lithium polysulfides: current collectors as electrodes in Li/S battery configuration.
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DOI：
10.1038/srep08763
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发表时间：
2015-03-05
影响因子：
4.6
通讯作者：
Arava LM
中科院分区：
文献类型：
--
作者：
Babu G;Ababtain K;Ng KY;Arava LM
锂硫（Li/S）化学物质由于其高理论能量密度而成为最有前途的下一代电池技术之一。然而，它们的中间副产物多硫化物（PS）的有害影响必须得到解决，以实现这些理论性能限制。使用多孔碳捕获PS的有限方法取得了有限的成功。在这项研究中，我们偏离了流行的方法，通过在Li/S电池配置中引入催化概念。发现工程集流体对PS具有催化活性，从而消除了对碳基质及其加工强制性粘合剂、添加剂和溶剂的需要。我们揭示了电化学性能的大幅提高，并证实了我们的研究结果，使用一个详细的实验参数研究，涉及几个动力学参数，如表面积，温度，电流速率和浓度的PS的变化。所得到的新型电池配置使用二维（2D）平面Ni集电器提供了700 mAh g-1的放电容量，并且使用设计的三维（3D）集电器实现了高达900 mAh g-1的容量增强。 电池容量已经过100次充放电循环的稳定性测试。
Lithium Sulfur (Li/S) chemistries are amongst the most promising next-generation battery technologies due to their high theoretical energy density. However, the detrimental effects of their intermediate byproducts, polysulfides (PS), have to be resolved to realize these theoretical performance limits. Confined approaches on using porous carbons to entrap PS have yielded limited success. In this study, we deviate from the prevalent approach by introducing catalysis concept in Li/S battery configuration. Engineered current collectors were found to be catalytically active towards PS, thereby eliminating the need for carbon matrix and their processing obligatory binders, additives and solvents. We reveal substantial enhancement in electrochemical performance and corroborate our findings using a detailed experimental parametric study involving variation of several kinetic parameters such as surface area, temperature, current rate and concentration of PS. The resultant novel battery configuration delivered a discharge capacity of 700 mAh g−1 with the two dimensional (2D) planar Ni current collectors and an enhancement in the capacity up to 900 mAh g−1 has been realized using the engineered three dimensional (3D) current collectors. The battery capacity has been tested for stability over 100 cycles of charge-discharge.
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影响因子：
4.6
作者：
Hao, Feng;Dong, Pei;Zhang, Jing;Zhang, Yongchang;Loya, Phillip E.;Hauge, Robert H.;Li, Jianbao;Lou, Jun;Lin, Hong
通讯作者：
Lin, Hong
影响因子：
15
作者：
Ogasawara, T;Débart, A;Bruce, PG
通讯作者：
Bruce, PG
影响因子：
3.9
作者：
HODES, G;MANASSEN, J;CAHEN, D
通讯作者：
CAHEN, D
影响因子：
--
作者：
Ji, Xiulei;Nazar, Linda F.
通讯作者：
Nazar, Linda F.
影响因子：
16.6
作者：
Jayaprakash, N.;Shen, J.;Archer, Lynden A.
通讯作者：
Archer, Lynden A.