期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 39, 页码 33863-33875出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b09002
关键词
in situ precipitation and encapsulation; Er2O3; voltage fading; capacity degradation; Li- and Mn-rich layered oxide cathode material; lithium ion batteries
资金
- National Natural Science Foundation of the People's Republic of China [51571178]
- Aerospace Science and Technology Innovation Fund of the China Aerospace Science and Technology Corp. (CASC)
- National Materials Genome Project [2016YFB0700600]
A novel strategy of in situ precipitation and encapsulation of the Er2O3 phase on the Li(Li0.2Ni0.13Co0.13Mn0.54)O-2 (LNCMO) cathode material for lithium ion batteries is proposed for the first time. The Er2O3 phase is precipitated from the bulk of the LNCMO material and encapsulated onto its. entire surface during the calcining process. Electroehemicial 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 transfnission electron microscopy. The results show that an-about 10 nm Er2O3 layer is successfully encapsulated onto the entire surface of the LNCMO matrix material. This unique nanoscale Er2O3 encapsulation 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.
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