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Addition of yttrium oxide as an effective way to enhance the cycling stability of LiCoO2 cathode material for Li-ion batteries
Solid State Ionics ( IF 3.2 ) Pub Date : 2020-08-25 , DOI: 10.1016/j.ssi.2020.115426
Hubert Ronduda , Magdalena Zybert , Anna Szczęsna , Tomasz Trzeciak , Andrzej Ostrowski , Piotr Wieciński , Władysław Wieczorek , Wioletta Raróg-Pilecka , Marek Marcinek

Lithium‑cobalt oxide (LiCoO2) is the first and still popular cathode material (LCO) used in Li-ion batteries. Its high theoretical capacity is a driving force to improve its properties in order to fully use its significant potential. In this paper the attempts of a partial substitution of Co3+ ions with Y3+ ions to synthesize yttrium-doped LiCoO2 cathode (0–15 mol% of Y) were described. The physicochemical characterization were conducted by ICP, TGA-MS, N2 physisorption, X-ray diffraction (PXRD) and scanning electron microscopy (SEM-EDS). All the prepared cathode materials exhibit well-layered structure and high crystallinity. Unexpectedly, yttrium ions did not substituted the Co3+ sites and were present in the form of a separate oxide phase. Yttrium oxide act as a modifier adversely affecting the initial capacity of the LCO cathode material. However, the galvanostatic cycling revealed that the yttrium oxide addition has a beneficial effect on the cycling stability and capacity retention of the LCO material, especially for the small content of Y3+ (5 mol%). The cycling of this electrode (100 cycles at 1C between 3.0 and 4.4 V vs. Li/Li+) was stable and constant, the loss of capacity was steady and the smallest among all the tested materials.



中文翻译:

添加氧化钇作为增强锂离子电池LiCoO 2正极材料循环稳定性的有效方法

锂钴氧化物(LiCoO 2)是用于锂离子电池的第一种且仍很流行的正极材料(LCO)。它的高理论容量是改善其性能以充分利用其巨大潜力的动力。本文描述了用Y 3+离子部分取代Co 3+离子来合成钇掺杂的LiCoO 2阴极(Y的0-15摩尔%)的尝试。通过ICP,TGA-MS,N 2物理吸附,X射线衍射(PXRD)和扫描电子显微镜(SEM-EDS)进行理化表征。所有制备的正极材料均显示出良好的层状结构和高结晶度。出乎意料的是,钇离子并未取代Co 3+并以单独的氧化物相形式存在。氧化钇用作改性剂,不利地影响了LCO阴极材料的初始容量。然而,恒电流循环表明,加入氧化钇对LCO材料的循环稳定性和容量保持具有有益的作用,特别是对于少量的Y 3+(5mol%)。该电极的循环(在1C下100循环,相对于Li / Li +在3.0和4.4 V之间)是稳定且恒定的,容量损失稳定且在所有测试材料中最小。

更新日期:2020-08-25
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