Influence of Ambient Air on Cell Reactions of Li-air Batteries
Influence of Ambient Air on Cell Reactions of Li-air Batteries
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环境空气对锂空气电池电池反应的影响
DOI：
10.1016/j.electacta.2016.01.102
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发表时间：
2016-02-10
影响因子：
6.6
通讯作者：
Guo, Xiangxin
中科院分区：
文献类型：
--
作者：
Huang, Shiting;Cui, Zhonghui;Guo, Xiangxin
在目前可用的可充电存储单元中，非水锂空气电池提供了最高的理论能量密度。然而，空气中的H2O和CO2被认为是阻碍其性能的有害因素。因此，以往的研究大多集中在纯O-2作为工作气氛的锂氧电池上。环境空气对电池化学性质的实际影响很少被研究。本研究以四乙二醇二甲醚（TEGDME）为基础的电解质和碳纳米管为基础的阴极在环境空气中工作，对锂空气电池进行了研究。第一次放电至2 V时，电池的比容量高达7000 mAh g(1)，当容量截止为500 mAh g(1)时，电池的比容量超过50次。发现tegdme基电解质在电池运行过程中有轻微的分解。初始放电形成Li2O2，并与CO2和H2O反应转化为Li2CO3和LiOH。锂阳极在循环后会膨胀和粉碎，这一问题可以通过涂覆聚合物层的保护来缓解。这些结果为开发实用的环境空气锂电池提供了重要的信息。(C) 2016 Elsevier Ltd.版权所有。
The non-aqueous Li-air battery offers the highest theoretical energy density among currently available rechargeable storage units. However, H2O and CO2 in air are viewed as detrimental factors which hinder its performance. Thus, most previous researches focus on the Li-oxygen battery with pure O-2 as working atmosphere. The actual influence of ambient air on the cell chemistry has seldom been investigated. Here, we carry out study of the Li-air batteries with tetraethylene glycol dimethyl ether (TEGDME)-based electrolytes and carbon-nanotube-based cathodes operated in ambient air. The cells show the specific capacity as large as 7000 mAh g (1) upon the first discharge to 2 V and more than 50 cycles when being operated with the capacity cutoff of 500 mAh g (1). It is found that the TEGDME-based electrolytes slightly decompose during cell operation. Li2O2 forms during initial discharge and turns Li2CO3 and LiOH owing to its reaction with CO2 and H2O. The lithium anodes become expanded and pulverized after cycles, the problem of which can be relieved by protection with coated polymer layers. These results give essential information that would be helpful for development of the practical Li-air batteries operated in ambient atmosphere. (C) 2016 Elsevier Ltd. All rights reserved.