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What is the Role of Nb in Nickel-Rich Layered Oxide Cathodes for Lithium-Ion Batteries?
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-03-18 , DOI: 10.1021/acsenergylett.1c00190 Fengxia Xin 1 , Hui Zhou 1 , Yanxu Zong 2 , Mateusz Zuba 3 , Yan Chen 4 , Natasha A. Chernova 1 , Jianming Bai 5 , Ben Pei 1 , Anshika Goel 6 , Jatinkumar Rana 3 , Feng Wang 7 , Ke An 4 , Louis F. J. Piper 3 , Guangwen Zhou 2 , M. Stanley Whittingham 1
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-03-18 , DOI: 10.1021/acsenergylett.1c00190 Fengxia Xin 1 , Hui Zhou 1 , Yanxu Zong 2 , Mateusz Zuba 3 , Yan Chen 4 , Natasha A. Chernova 1 , Jianming Bai 5 , Ben Pei 1 , Anshika Goel 6 , Jatinkumar Rana 3 , Feng Wang 7 , Ke An 4 , Louis F. J. Piper 3 , Guangwen Zhou 2 , M. Stanley Whittingham 1
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Nickel-rich layered metal oxide LiNi1–y–zMnyCozO2 (1 – y – z ≥ 0.8) materials are the most promising cathodes for next-generation lithium-ion batteries in electric vehicles. However, they lose more than 10% of their capacity on the first cycle, and interfacial/structural instability causes capacity fading. Coating and substitution are possible direct and effective solutions to solve these challenges. In this Letter, Nb coating and Nb substitution on LiNi0.8Mn0.1Co0.1O2 (NMC811) is easily produced through a scalable wet chemistry method followed by sintering from 400 to 800 °C. A Li-free Nb oxide treatment is found to remove surface impurities forming a LiNbO3/Li3NbO4 surface coating, to reduce the first capacity loss and to improve the rate performance. Nb substitution stabilizes the structure, as evidenced by less heat evolution on heating, thus providing better long cycling stability with a 93.2% capacity retention after 250 cycles.
中文翻译：
Nb在用于锂离子电池的富镍层状氧化物阴极中的作用是什么？
富镍层状金属氧化物的LiNi 1- ý - ž锰ý钴ž Ô 2（1 - Ÿ - Ž ≥0.8）的材料是在电动车辆的新一代锂离子电池的最有希望的阴极。但是，它们在第一个循环中损失了超过10％的容量，并且界面/结构的不稳定性导致容量衰减。涂层和替代是解决这些挑战的直接有效的解决方案。在本函中，LiNi 0.8 Mn 0.1 Co 0.1 O 2上的Nb涂层和Nb替代（NMC811）易于通过可扩展的湿化学方法生产，然后在400至800°C的温度下烧结。发现无锂的Nb氧化物处理可去除形成LiNbO 3 / Li 3 NbO 4表面涂层的表面杂质，从而减少首次容量损失并提高倍率性能。Nb取代使结构稳定，这在加热时产生的热量较少，从而证明了更好的长期循环稳定性，并在250次循环后保持了93.2％的容量。
更新日期：2021-04-09
中文翻译：
Nb在用于锂离子电池的富镍层状氧化物阴极中的作用是什么？
富镍层状金属氧化物的LiNi 1- ý - ž锰ý钴ž Ô 2（1 - Ÿ - Ž ≥0.8）的材料是在电动车辆的新一代锂离子电池的最有希望的阴极。但是，它们在第一个循环中损失了超过10％的容量，并且界面/结构的不稳定性导致容量衰减。涂层和替代是解决这些挑战的直接有效的解决方案。在本函中，LiNi 0.8 Mn 0.1 Co 0.1 O 2上的Nb涂层和Nb替代（NMC811）易于通过可扩展的湿化学方法生产，然后在400至800°C的温度下烧结。发现无锂的Nb氧化物处理可去除形成LiNbO 3 / Li 3 NbO 4表面涂层的表面杂质，从而减少首次容量损失并提高倍率性能。Nb取代使结构稳定，这在加热时产生的热量较少，从而证明了更好的长期循环稳定性，并在250次循环后保持了93.2％的容量。
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