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Controlling to Expand Reversibly Li2O2-formation/decomposition by Modifying Electrolyte in Lithium-oxygen Batteries

34 Pages Posted: 8 Jun 2018 Sneak Peek Status: Published

See all articles by Xiaodong Lin

Xiaodong Lin

Xiamen University - Collaborative Innovation Center of Chemistry for Energy Materials (iChEM)

Ruming Yuan

Xiamen University - Collaborative Innovation Center of Chemistry for Energy Materials (iChEM)

Yong Cao

Hefei Guoxuan High-tech Power Energy Co., Ltd.

Xiaobing Ding

Xiamen University - Collaborative Innovation Center of Chemistry for Energy Materials (iChEM)

Senrong Cai

Xiamen University - Collaborative Innovation Center of Chemistry for Energy Materials (iChEM)

Bowen Han

Xiamen University - Collaborative Innovation Center of Chemistry for Energy Materials (iChEM)

Xulai Yang

Hefei Guoxuan High-tech Power Energy Co., Ltd.

Lei Gong

Xiamen University - Collaborative Innovation Center of Chemistry for Energy Materials (iChEM)

Mingsen Zheng

Xiamen University - Collaborative Innovation Center of Chemistry for Energy Materials (iChEM)

Quanfeng Dong

Xiamen University - Collaborative Innovation Center of Chemistry for Energy Materials (iChEM)

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Abstract

Aprotic lithium-oxygen (Li-O2) battery has attracted worldwide attention because of its ultrahigh theoretical energy density. However, its practical application is critically hindered by cathode passivation, large polarization and severe parasitic reactions. Here, we demonstrated a newly designed ruthenium (II) polypyridyl complex (RuPC) by which an expanded reversibly Li2O2-formation/decomposition could be achieved in lithiumoxygen batteries. Experimental and theoretical results revealed that the RuPC can not only expand the formation of Li2O2 in electrolyte, but also suppress the reactivity of LiO2 intermediate during discharge, thus alleviating the cathode passivation and parasitic reactions significantly. In addition, an initial delithiation pathway can be achieved when charging in turn, thus the Li2O2 products can be decomposed reversibly with a low overpotential. As a result, the RuPC-catalyzed Li-O2 batteries exhibited a high discharge capacity (~9281 mAh g-1), a low charge overpotential (0.54 V) and a ultralong cycle life (371 cycles). This work provides an alternative way of designing the soluble organic catalysts for metal-oxygen batteries.

Keywords: lithium-oxygen battery; cathode passivation; large polarization; severe parasitic reactions; ruthenium (II) polypyridyl complex; multifunctional soluble catalyst; initial delithiation pathway

Suggested Citation

Lin, Xiaodong and Yuan, Ruming and Cao, Yong and Ding, Xiaobing and Cai, Senrong and Han, Bowen and Yang, Xulai and Gong, Lei and Zheng, Mingsen and Dong, Quanfeng, Controlling to Expand Reversibly Li2O2-formation/decomposition by Modifying Electrolyte in Lithium-oxygen Batteries (2018). Available at SSRN: https://ssrn.com/abstract=3188418 or http://dx.doi.org/10.2139/ssrn.3188418
This is a paper under consideration at Cell Press and has not been peer-reviewed.

Xiaodong Lin

Xiamen University - Collaborative Innovation Center of Chemistry for Energy Materials (iChEM)

Fujian 361005
China

Ruming Yuan

Xiamen University - Collaborative Innovation Center of Chemistry for Energy Materials (iChEM)

Fujian 361005
China

Yong Cao

Hefei Guoxuan High-tech Power Energy Co., Ltd.

Wei D Road, Yaohai Industrial Zone, Hefei
Hefei, Anhui 210016
China

Xiaobing Ding

Xiamen University - Collaborative Innovation Center of Chemistry for Energy Materials (iChEM)

Fujian 361005
China

Senrong Cai

Xiamen University - Collaborative Innovation Center of Chemistry for Energy Materials (iChEM)

Fujian 361005
China

Bowen Han

Xiamen University - Collaborative Innovation Center of Chemistry for Energy Materials (iChEM)

Fujian 361005
China

Xulai Yang

Hefei Guoxuan High-tech Power Energy Co., Ltd.

Wei D Road, Yaohai Industrial Zone, Hefei
Hefei, Anhui 210016
China

Lei Gong

Xiamen University - Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) ( email )

Fujian 361005
China

Mingsen Zheng

Xiamen University - Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) ( email )

Fujian 361005
China

Quanfeng Dong (Contact Author)

Xiamen University - Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) ( email )

Fujian 361005
China

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