In Situ Encapsulation of the Nanoscale Er2O3 Phase To Drastically Suppress Voltage Fading and Capacity Degradation of a Li- and Mn-Rich Layered Oxide Cathode for Lithium Ion Batteries
In Situ Encapsulation of the Nanoscale Er2O3 Phase To Drastically Suppress Voltage Fading and Capacity Degradation of a Li- and Mn-Rich Layered Oxide Cathode for Lithium Ion Batteries
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原位封装纳米级 Er2O3 相可显着抑制锂离子电池富锂和富锰层状氧化物正极的电压衰减和容量退化
DOI：
10.1021/acsami.7b09002
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发表时间：
2017
影响因子：
9.5
通讯作者：
Pan Hongge
中科院分区：
文献类型：
--
作者：
Zhang Shiming;Gu Haitao;Tang Tian;Du Wubin;Gao Mingxia;Liu Yongfeng;Jian Dechao;Pan Hongge
首次提出了在锂离子电池正极材料Li（Li0.2Ni0.13Co0.13Mn0.54）O2（LNCMO）上原位沉淀包覆Er2O3相的新方法。Er2O3相从LNCMO材料的本体中沉淀并在煅烧过程中包封到其整个表面上。通过恒电流充放电测试研究了其电化学性能。通过X射线衍射、X射线光电子能谱、扫描电子显微镜和高分辨透射电子显微镜对样品的结构和形貌进行了表征。结果表明，在LNCMO基体材料的整个表面成功地包覆了一层约10 nm的Er2O3薄膜。这种独特的纳米级Er2O3封装可以显著防止LNCMO阴极材料被电解质腐蚀，并在循环过程中稳定LNCMO阴极的晶体结构。因此，制备的Er2O3包覆LNCMO复合材料具有优异的循环性能和高的初始库仑效率。
A novel strategy of in situ precipitation and encapsulation of the Er2O3phase on the Li(Li0.2Ni0.13Co0.13Mn0.54)O2(LNCMO) cathode material for lithium ion batteries is proposed for the first time. The Er2O3phase is precipitated from the bulk of the LNCMO material and encapsulated onto its entire surface during the calcining process. Electrochemicial performance is investigated by a galvanostatic charge and discharge test. The structure and morphology are characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and high-resolution transmission electron microscopy. The results show that an about 10 nm Er2O3layer is successfully encapsulated onto the entire surface of the LNCMO matrix material. This unique nanoscale Er2O3encapsulation can significantly prevent the LNCMO cathode material from being corroded by electrolytes and stabilize the crystal structure of the LNCMO cathode during cycling. Therefore, the prepared Er2O3-coated LNCMO composite exhibits excellent cycling performace and a high initial Coulombic efficiency.