Nanowires of spinel cathode material for improved lithium-ion storage

Document Type

Article

Publication Date

9-1-2018

Abstract

Li-excess layered materials, such as Li[Li0.2Mn0.54Ni0.13Co0.13]O2 (LMNCO) et al. are promising cathode materials that can be used in batteries for hybrid electric vehicles (HEV)/electric vehicles (EV), due to their excellent lithium-storage capability and very high energy density. Dramatic capacity loss during electrochemical cycling seriously hinders their practical implementation. It is found that the LMNCO layered cathode material suffers from structural instability and irreversible layered-to-spinel phase transition during lithiation/delithiation, leading to dramatic loss of capacity and deteriorated electrochemical kinetics. To overcome this challenge, we synthesize spinel-structured LHMNCO TBA nanowires using an electrospinning method followed by facile ion-exchange promoted phase transition. After 100 electrochemical cycles at the specific current 0.5 C, spinel-structured LHMNCO TBA still retains a capacity of about 200 mAh/g, corresponding to a capacity retention ratio of 90.5%, much higher than that of layered LMNCO nanowires, which only maintains a specific capacity of 137 mAh/g with only 48.9% capacity retention.

Publication Source (Journal or Book title)

Ionics

First Page

2523

Last Page

2532

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