Rechargeable Li2O2 electrode for lithium batteries
Rechargeable Li2O2 electrode for lithium batteries
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DOI：
10.1021/ja056811q
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发表时间：
2006-02-01
影响因子：
15
通讯作者：
Bruce, PG
中科院分区：
文献类型：
--
作者：
Ogasawara, T;Débart, A;Bruce, PG
可充电锂电池代表了100年来储能领域最重要的发展之一，有可能解决全球变暖的关键问题。然而，它们储存能量的能力受到可以从正极嵌入电极中移除和重新插入正极嵌入电极中的锂的量的限制，LixCoO 2，0.5 < x < 1（对应于140 mA（.）h g（-1）电荷存储）。放弃嵌入电极，让Li在多孔电极上直接与空气中的O-2反应，可将理论电荷储存量提高5-10倍！在这里，我们展示了可充电Li/O-2电池成功运行的两个基本先决条件;在充电时（通过原位质谱法显示），在有或没有催化剂的情况下，放电时形成的Li 2 O2在充电时分解为Li和O-2，并且充电/放电循环可持续许多循环。
Rechargeable lithium batteries represent one of the most important developments in energy storage for 100 years, with the potential to address the key problem of global warming. However, their ability to store energy is limited by the quantity of lithium that may be removed from and reinserted into the positive intercalation electrode, LixCoO2, 0.5 < x < 1 (corresponding to 140 mA(.)h g(-1) of charge storage). Abandoning the intercalation electrode and allowing Li to react directly with O-2 from the air at a porous electrode increases the theoretical charge storage by a remarkable 5-10 times! Here we demonstrate two essential prerequisites for the successful operation of a rechargeable Li/O-2 battery; that the Li2O2 formed on discharging such an O-2 electrode is decomposed to Li and O-2 on charging (shown here by in situ mass spectrometry), with or without a catalyst, and that charge/discharge cycling is sustainable for many cycles.