Surface Coating Layer on Li Metal for Increased Cycle Stability of Li-O2 Batteries

被引：33

作者：

Jang, Il Chan ^{[1
]}

Ida, Shintaro ^{[2
]}

Ishihara, Tatsumi ^{[1
,2
,3
]}

机构：

[1] Kyushu Univ, Grad Sch Integrated Frontier Sci, Dept Automot Sci, Nishi Ku, Fukuoka 8190395, Japan

[2] Kyushu Univ, Fac Engn, Dept Appl Chem, Nishi Ku, Fukuoka 8190395, Japan

[3] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, Fukuoka 8190395, Japan

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2014年 / 161卷 / 05期

关键词：

LITHIUM-AIR BATTERY; ELECTROCHEMICAL PERFORMANCE; IMPEDANCE SPECTROSCOPY; CARBONATE SOLUTIONS; SULFUR BATTERIES; ELECTROLYTE; ANODE; POLYMER; MORPHOLOGY; CHEMISTRY;

D O I：

10.1149/2.087405jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The effects of polymer coating on the cycle stability of Li-O-2 batteries were investigated. Capacity fading is much higher with increasing Li utilization; however, it was found that coating the Li metal with poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) highly and effectively increased the cycle stability of a Li-O-2 battery. This indicates that the coating may prevent shape changes of the metal during discharge and charge cycles. Impedance analysis suggested that the interfacial resistance on the anode compartment explained the low cycle stability in cells containing pristine Li. The PVdF-HFP coating suppressed this interfacial resistance during discharge-charge cycles performed at current densities exceeding 0.1 mA/cm(2). Microscopy studies showed that lithium morphology deposited on the polymer coated electrode showed suppressed needle-like dendrite formation explaining the increase in the cycle stability of Li-O-2 batteries. (C) 2014 The Electrochemical Society. All rights reserved.

引用

页码：A821 / A826

页数：6

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