Dual Roles of Li3N as an Electrode Additive for Li‐Excess Layered Cathode Materials: A Li‐Ion Sacrificial Salt and Electrode‐Stabilizing Agent,Chemistry - A European Journal

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Dual Roles of Li3N as an Electrode Additive for Li‐Excess Layered Cathode Materials: A Li‐Ion Sacrificial Salt and Electrode‐Stabilizing Agent
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2018-08-20 , DOI: 10.1002/chem.201801809
Xiaofei Bian ₁ , Qiang Pang ₁ , Yingjing Wei ₁ , Dong Zhang ₁ , Yu Gao ₁ , Gang Chen _{1,

2}

Affiliation

Li₂CO₃‐passivated Li₃N with high stability is prepared by aging Li₃N powder in dry air, and is then used as an electrode additive for a Li(Li_0.18Ni_0.15Co_0.15Mn_0.52)O₂ (LLMO) cathode material. The material shows a large irreversible capacity of 800 mA h g⁻¹ during the first charge, with the formation of a Li₂N intermediate product. Acting as a Li⁺ sacrificial salt for a LLMO(+)/graphite(−) Li‐ion battery, 2 wt % Li₃N results in a 10 % increase in discharge capacity. The Li₂N intermediate product reacts with the electrolyte, forming a uniform and regular surface film on the cathode. Moreover, chemical bonding between LLMO and N improves the electrode stability, resulting in excellent electrochemical performance.

中文翻译：

Li3N作为过量锂分层电极材料的电极添加剂的双重作用：锂离子牺牲盐和电极稳定剂

通过在干燥空气中老化Li ₃ N粉末来制备具有高稳定性的Li ₂ CO ₃钝化的Li ₃ N，然后将其用作Li（Li _0.18 Ni _0.15 Co _0.15 Mn _0.52）O ₂（LLMO）的电极添加剂阴极材料。该材料在首次充电期间显示出800 mA h g ^-1的不可逆大容量，并形成了Li ₂ N中间产物。2 wt％的Li ₃ N充当LLMO（+）/石墨（-）锂离子电池的Li ⁺牺牲盐，导致放电容量增加10％。李₂N中间产物与电解质反应，在阴极上形成均匀且规则的表面膜。此外，LLMO和N之间的化学键提高了电极的稳定性，从而获得了出色的电化学性能。

更新日期：2018-08-20

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