The Stabilization Effect of CO2 in Lithium-Oxygen/CO2 Batteries.,Angewandte Chemie International Edition

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The Stabilization Effect of CO2 in Lithium-Oxygen/CO2 Batteries.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-06-14 , DOI: 10.1002/anie.202006303
Kai Chen _{1,

2} , Gang Huang ₃ , Jin-Ling Ma ₁ , Jin Wang ₁ , Dong-Yue Yang _{1,

2} , Xiao-Yang Yang ₁ , Yue Yu _{1,

2} , Xin-Bo Zhang _{1,

2}

Affiliation

The lithium (Li)–air battery has an ultrahigh theoretical specific energy, however, even in pure oxygen (O₂), the vulnerability of conventional organic electrolytes and carbon cathodes towards reaction intermediates, especially O₂⁻, and corrosive oxidation and crack/pulverization of Li metal anode lead to poor cycling stability of the Li‐air battery. Even worse, the water and/or CO₂ in air bring parasitic reactions and safety issues. Therefore, applying such systems in open‐air environment is challenging. Herein, contrary to previous assertions, we have found that CO₂ can improve the stability of both anode and electrolyte, and a high‐performance rechargeable Li–O₂/CO₂ battery is developed. The CO₂ not only facilitates the in situ formation of a passivated protective Li₂CO₃ film on the Li anode, but also restrains side reactions involving electrolyte and cathode by capturing O₂⁻. Moreover, the Pd/CNT catalyst in the cathode can extend the battery lifespan by effectively tuning the product morphology and catalyzing the decomposition of Li₂CO₃. The Li–O₂/CO₂ battery achieves a full discharge capacity of 6628 mAh g⁻¹ and a long life of 715 cycles, which is even better than those of pure Li–O₂ batteries.

中文翻译：

锂氧/ CO2电池中CO2的稳定作用。

的锂（Li） -空气电池具有超高理论比能量，然而，甚至在纯氧气（O ₂），常规有机电解质和朝向反应中间体碳阴极的脆弱性，特别是运行₂^-，和腐蚀性氧化和裂纹/锂金属阳极的粉碎会导致锂空气电池的循环稳定性差。更糟糕的是，空气中的水和/或CO ₂带来了寄生反应和安全问题。因此，在露天环境中应用此类系统具有挑战性。在这里，与先前的说法相反，我们发现CO ₂可以改善阳极和电解质的稳定性，以及高性能的可充电Li–O ₂ / CO ₂电池已开发。该CO ₂不仅有利于在原位形成保护性钝化的Li ₂ CO ₃的锂阳极膜，而且还通过捕获ö抑制涉及电解质和阴极侧反应₂^-。此外，阴极中的Pd / CNT催化剂可通过有效调节产品形态并催化Li ₂ CO ₃的分解来延长电池寿命。Li–O ₂ / CO ₂电池的完全放电容量为6628 mAh g ^-1，使用寿命长达715个循环，甚至比纯Li–O ₂电池更好。

更新日期：2020-06-14

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