Issue 25, 2015

The role of nanoscale-range vanadium treatment in LiNi0.8Co0.15Al0.05O2 cathode materials for Li-ion batteries at elevated temperatures

Abstract

In order to overcome the inherent structural instability of bare LixNi0.8Co0.15Al0.05O2 (BNCA) containing large amounts of LiOH and Li2CO3 impurities at 60 and >200 °C, an effective nanoscale layer was generated by coating BNCA with an ammonium vanadate precursor, followed by annealing at 400 °C. This process forms a 17 nm thick surface layer containing V4+ ions in the transition metal 3b sites, thereby decreasing the thickness of the cation-mixing layer, which is the main factor responsible for destabilizing the surface structure. Such a coating also helps in substantially reducing the amount of surface impurities of LiOH, Li2CO3, and H2O by forming LiVO2, LiV2O5, VO2, and V2O5. Consequently, at 60 °C, vanadium-treated LiNi0.8Co0.15Al0.05O2 (VNCA) demonstrated excellent cyclability with a discharge capacity of 179 mA h g−1 after 200 cycles (after 17 days) between 3 and 4.3 V, corresponding to 90% capacity retention, which is 18% higher than the capacity retention measured for BNCA. More importantly, VNCA exhibits a significantly reduced heat generation and a higher onset temperature for exothermic reactions.

Graphical abstract: The role of nanoscale-range vanadium treatment in LiNi0.8Co0.15Al0.05O2 cathode materials for Li-ion batteries at elevated temperatures

Supplementary files

Article information

Article type
Paper
Submitted
02 Mar 2015
Accepted
15 May 2015
First published
15 May 2015

J. Mater. Chem. A, 2015,3, 13453-13460

Author version available

The role of nanoscale-range vanadium treatment in LiNi0.8Co0.15Al0.05O2 cathode materials for Li-ion batteries at elevated temperatures

M. Lee, M. Noh, M. Park, M. Jo, H. Kim, H. Nam and J. Cho, J. Mater. Chem. A, 2015, 3, 13453 DOI: 10.1039/C5TA01571E

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