Effect of non-stoichiometry on the charge storage capacity of NiO conversion anodes in Li-ion batteries

Kiran, GK and Munichandraiah, N and VishnuKamath, P (2018) Effect of non-stoichiometry on the charge storage capacity of NiO conversion anodes in Li-ion batteries. In: Journal of Solid State Electrochemistry, 22 (12). pp. 3833-3843.

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Abstract

Conversion anodes comprising non-stoichiometric black NiO suffer severe capacity fading in Li-ion batteries despite having a high Li+ ion diffusion coefficient. We attribute this capacity fading to (i) its small crystallite size (~ 8 nm) and (ii) high charge transfer resistance (Rct ~ 60–180 Ω cm2). Small crystallites enhance grain boundaries which promote Li+ ion diffusion without efficient material utilization. In contrast, the stoichiometric green NiO anodes deliver a stable capacity of 280 mAh g−1 over 50 charge-discharge cycles. The comparatively higher capacity of green NiO can be explained from its (i) large crystallite size (~ 104 nm) and (ii) negligible Rct values.

Item Type:	Journal Article
Publication:	Journal of Solid State Electrochemistry
Publisher:	Springer New York LLC
Additional Information:	The copyright for this article belongs to Springer New York LLC.
Keywords:	Anodes; Charge transfer; Crystallite size; Grain boundaries; Ions; Lithium compounds; Nickel oxide; Stoichiometry, Capacity fading; Charge storage capacity; Charge-discharge cycle; Impedance spectroscopy; Ion diffusion coefficient; Material utilization; Non stoichiometry; Non-stoichiometric, Lithium-ion batteries
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	02 Aug 2022 11:44
Last Modified:	02 Aug 2022 11:44
URI:	https://eprints.iisc.ac.in/id/eprint/75130

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