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High-performance lithium ion batteries using SiO2-coated LiNi0.5Co0.2Mn0.3O2 microspheres as cathodes
journal contribution
posted on 2017-01-01, 00:00 authored by C Chen, Tao Tao, W Qi, H Zeng, Y Wu, B Liang, Y Yao, S Lu, Ying (Ian) ChenYing (Ian) ChenLiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM 523) is one of the commercialized NCM cathode materials for lithium ion batteries. In this work, we demonstrate that a 0.5 wt% SiO 2 nanoparticles-coated NCM 523 shows an improved cycling performance and thermal stability, compared with the pure NCM 523. The structural integrity of the NCM 523 during cycling processes can be maintained by the SiO 2 coating layer with a thickness of about 20–30 nm. The 0.5 wt% SiO 2 -coated NCM 523 cathode exhibits a capacity retention of 82.5% over 100 cycles at 0.1 C between 2.5 and 4.3 V, while that of the pristine material is only 68%. Also, the 0.5 wt% SiO 2 -coated sample exhibits a higher reversible capacity (153.4 mAh g −1 ) and better capacity retention (92.4%) over 50 cycles than those of the pure NCM 523 (114.3 mAh g −1 , 66.0%) in the electrolyte with lithium difluoro (oxalato)borate at 1 C in the voltage range of 2.8–4.5 V. The SiO 2 coating layer plays a critical role in improving the electrochemical performance of NCM 523 cathode.
History
Journal
Journal of alloys and compoundsVolume
709Pagination
708 - 716Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0925-8388Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2017, ElsevierUsage metrics
Keywords
CathodeSiO2 coatingLiNi0.5Co0.2Mn0.3O2Thermal stabilityLithium ion batteriesScience & TechnologyPhysical SciencesTechnologyChemistry, PhysicalMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringChemistryMaterials ScienceLiNi(0.5)Co(0.2)Mno(0.3)O(2)CYCLING PERFORMANCEELECTROCHEMICAL PERFORMANCESIGNIFICANT IMPROVEMENTVOLTAGENANOPARTICLESSURFACECondensed Matter Physics
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