Use of Ce to Reinforce the Interface of Ni‐Rich LiNi0.8Co0.1Mn0.1O2 Cathode Materials for Lithium‐Ion Batteries under High Operating Voltage,ChemSusChem

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Use of Ce to Reinforce the Interface of Ni‐Rich LiNi0.8Co0.1Mn0.1O2 Cathode Materials for Lithium‐Ion Batteries under High Operating Voltage
ChemSusChem ( IF 7.5 ) Pub Date : 2019-01-25 , DOI: 10.1002/cssc.201802304
Feng Wu _{1,

2} , Qing Li ₁ , Lai Chen ₁ , Yun Lu ₁ , Yuefeng Su _{1,

2} , Liying Bao ₁ , Renjie Chen _{1,

2} , Shi Chen _{1,

2}

Affiliation

Nickel‐rich cathode materials are among the most promising cathode materials for high‐energy lithium‐ion batteries. However, their structural and thermodynamic stability, cycle and rate performances still need to be further improved. In this study, the rare earth element Ce is employed to reinforce the interface of Ni‐rich cathode materials both internally and externally. High‐valence Ce⁴⁺ can easily cause the oxidization of Ni²⁺ to Ni³⁺ when doped into the material owing to its strong oxidation performance, thus reducing Li⁺/Ni²⁺ mixing. In addition, the inert Ce³⁺ ions in transition metal slabs with strong Ce−O bonds can maintain the layered structure at high delithiation state. Furthermore, when the calcination temperature during synthesis is above 500 °C, a CeO₂ coating layer will form, which can protect the electrode from erosion by the electrolyte and alleviate the increasing resistance during cycling. The modified Ni‐rich materials fabricated with an erosion‐resistant CeO₂ layer outside and stronger Ce−O bonds inside with reduced Li⁺/Ni²⁺ mixing exhibit excellent electrochemical properties, especially at high operating voltages, for example, the 50th capacity retention at 0.2 C within 2.75–4.5 V is improved from 89.8 % to 99.2 % after the modification.

中文翻译：

使用Ce增强高工作电压下锂离子电池的富镍LiNi0.8Co0.1Mn0.1O2正极材料的界面

富镍正极材料是高能锂离子电池最有希望的正极材料之一。但是，它们的结构和热力学稳定性，循环和速率性能仍需要进一步改善。在这项研究中，稀土元素Ce用于在内部和外部增强富Ni阴极材料的界面。掺杂到材料中的高价Ce ⁴⁺由于其强大的氧化性能，很容易导致Ni ²⁺氧化为Ni ³⁺，从而减少了Li ⁺ / Ni ^2+的混合。此外，惰性铈³⁺具有强Ce-O键的过渡金属平板中的离子可以将层状结构维持在高脱锂状态。此外，当合成期间的煅烧温度高于500℃时，将形成CeO ₂涂层，其可以保护电极免受电解质的侵蚀并减轻循环期间电阻的增加。具有外部抗腐蚀CeO ₂层和内部强Ce-O键并减少Li ⁺ / Ni ²⁺混合的改性富镍材料具有出色的电化学性能，特别是在高工作电压下，例如第50个容量保持率修改后，在0.25 C和2.75–4.5 V范围内的电压从89.8％提高到99.2％。

更新日期：2019-01-25

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