In:
Journal of The Electrochemical Society, The Electrochemical Society, Vol. 169, No. 4 ( 2022-04-01), p. 040533-
Abstract:
LiNiO 2 , a promising cobalt-free cathode, suffers from poor cyclic stability and inferior rate performance due to structural degradation. A strategy based on the synergistic effect of a strong Nb–O bond (753 kJ mol −1 ), high valence state (Nb 5+ ), and larger ionic radius (0.64 Å) was developed to improve the properties of LiNiO 2 . The synergistic effects can effectively improve lattice stability, lower Li + /Ni 2+ cation mixing, expand LiO 6 -slab spaces, enhance the conductivity and inhibit the H2–H3 phase transition, which can enhance the stability of the layered structure, accelerate Li + diffusion and alleviate mechanical damage. Therefore, LiN 0.99 Nb 0.01 O 2 exhibits higher capacity retention (91.4% after 100 cycles at 0.5C) and superior rate capability (143 mAh g −1 at 5C). As a comparison, the data of bare LiNiO 2 is 69.2% and 127 mAh g −1 under the same conditions. These results further demonstrate the effectiveness of the proposed doping strategy.
Type of Medium:
Online Resource
ISSN:
0013-4651
,
1945-7111
DOI:
10.1149/1945-7111/ac653e
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2022
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