The Enhanced Electrochemical Performance of Nanocrystalline Li[Li sub(0.26)Ni sub(0.11)Mn sub(0.63)]O sub(2) Synthesized by the Molten-Salt Method for Li-ion batteries

• Published in: Electrochimica acta Vol. 117; pp. 285 - 291
• Main Authors: ZhenYao, Wang, Biao, Li, Jin, Ma, DingGuo, Xia
• Format: Journal Article
• Language: English
• Published: 20-01-2014
• Subjects: Channels; Diffusion rate; Electrodes; Extraction; Insertion; Lithium; Metal ions; Nanocrystals
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2013.11.124

Nanocrystalline Li[Li0.26Ni0.11Mn0.63]O2 were easily prepared by using Ni0.15Mn0.85(OH) sub(2) and Li sub(2)CO sub(3) as precursors and KCl as melt-salt for the high capacity materials of Li-ion storage. The obtained nanoparticles showed same morphology of polygonal shape and the particle size distribution increased with increasing sinter temperature. The Li[Li0.26Ni0.11Mn0.63]O2 electrode sintered at 800 degree C for 12 h exhibits a reversible capacity of more than 300 mAh g super(-1) at 0.1 C rate between 2 V and 4.8 V and the capacity retention remains 86% and 90% after 90 cycles at the rate of 0.5 C and 1 C, respectively. These superior electrochemical performances are discussed in detail and ascribed to the low dimension and well-crystallized particles. The low dimension provides a short diffusion path and fast transport channels for the lithium ion insertion/extraction reactions and the well-crystallized structure restrains the elimination of oxide ion vacancies and metal ions rearrangement during charge-discharge cycling.