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SOC-dependent high-rate dischargeability of AB_5-type metal hydride anode: Mechanism linking phase transition to electrochemical H-desorption kinetics

Zhu, Ding and Zhou, Wanhai and Tang, Zhengyao and Heng, Yang and Liu, Kun and Li, Jinchi and Xie, Lingzhi and Chen, Yungui (2019) SOC-dependent high-rate dischargeability of AB_5-type metal hydride anode: Mechanism linking phase transition to electrochemical H-desorption kinetics. International Journal of Hydrogen Energy, 44 (29). pp. 15278-15286. ISSN 0360-3199. https://resolver.caltech.edu/CaltechAUTHORS:20190513-101849782

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Abstract

The current application of nickel-metal hydride (Ni-MH) batteries places a particular emphasis on the high-rate dischargeability (HRD) at varying state-of-charges (SOCs). However, most research on the HRD of AB5-type MH anodes only considers the fully charged case but overlooks the significant impact of SOC. In this work, at first, the great SOC effect on the HRD or pulse power of AB_5-type MH anode is presented. Then, by crosschecking the SOC dependence of both ‘in situ’ polarization and ‘ex situ’ kinetic parameters, a definite SOC-dependent H-desorption kinetics for AB_5-type MH anode is acquired. Finally, a novel mechanism linking phase transition to H-desorption kinetics for AB_5-type MH anode is proposed. The HRD or pulse power of AB5-type MH anode significantly improves when SOC decreases from 100% to an appropriate range (90-60%) and suddenly deteriorates when SOC drops below ∼20%. The former improvement relates to the formation of saturated solid solution that simultaneously facilitates both charge-transfer reaction and hydrogen diffusion. The latter deterioration is due to the complete depletion of hydride causing an insufficient supply of hydrogen atoms.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.ijhydene.2019.04.078DOIArticle
ORCID:
AuthorORCID
Heng, Yang0000-0001-7431-932X
Liu, Kun0000-0003-1359-7865
Alternate Title:SOC-dependent high-rate dischargeability of AB5-type metal hydride anode: Mechanism linking phase transition to electrochemical H-desorption kinetics
Additional Information:© 2019 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC. Received 26 January 2019, Revised 8 April 2019, Accepted 9 April 2019, Available online 10 May 2019. This study was supported by the Program of International S&T Cooperation of China (No. 2016YFE0124500), the National Natural Science Foundation of China (No. 21603154) and the Science and Technology Support Program of Sichuan Province (No. 2017RZ0033).
Funders:
Funding AgencyGrant Number
Program of International S&T Cooperation of China2016YFE0124500
National Natural Science Foundation of China21603154
Science and Technology Support Program of Sichuan Province2017RZ0033
Subject Keywords:Metal hydride anode; SOC; HRD; Phase transition; Electrode kinetics
Issue or Number:29
Record Number:CaltechAUTHORS:20190513-101849782
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190513-101849782
Official Citation:Ding Zhu, Wanhai Zhou, Zhengyao Tang, Yang Heng, Kun Liu, Jinchi Li, Lingzhi Xie, Yungui Chen, SOC-dependent high-rate dischargeability of AB5-type metal hydride anode: Mechanism linking phase transition to electrochemical H-desorption kinetics, International Journal of Hydrogen Energy, Volume 44, Issue 29, 2019, Pages 15278-15286, ISSN 0360-3199, https://doi.org/10.1016/j.ijhydene.2019.04.078. (http://www.sciencedirect.com/science/article/pii/S0360319919314764)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95427
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:13 May 2019 17:36
Last Modified:11 Nov 2020 00:32

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