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Preparation of 3D spherical Ni/Al LDHs with significantly enhanced electrochemical performance as a superior cathode material for Ni/MH batteries.

Nie, Yajing; Li, Wei; Pan, Junqing; Senthil, Raja Arumugam; Fernandez, Carlos; Khan, Abrar; Sun, Yanzhi; Liu, Jianjun

Authors

Yajing Nie

Wei Li

Junqing Pan

Raja Arumugam Senthil

Carlos Fernandez

Abrar Khan

Yanzhi Sun

Jianjun Liu

Abstract

Nickel-based hydroxides with excellent electrochemical performance have been considered as cathode materials for Ni/MH batteries. In this paper, a Ni/Al layered double hydroxides (Ni/Al LDHs) material with three-dimensional (3D) spherical structure is synthesized by a facile stable dual complexation-precipitation method. SEM images show that the obtained Ni/Al LDHs possess 3D spherical structure composed of nanosheets. XRD and CV tests indicate that doping of Al increases the distance between Ni-Al layers, greatly improving the specific capacity of the obtained materials. The electrochemical tests show that the specific capacity of the obtained material with 18% Al is up to 383.4 mAh g-1 at a current density of 1 A g-1. In addition, when the current density is further increased to 10 and 20 A g-1, the specific capacity of this material still maintains 345.0 mAh g-1 and 307.9 mAh g-1, respectively, which implies that this cathode material can provide remarkable power densities. Moreover, the material composed of Ni/Al LDHs keeps 97.6% initial capacity after 5000 cycles at a current density of 10 A g-1, showing an excellent cycling stability and durability.

Journal Article Type Article
Publication Date Nov 1, 2018
Journal Electrochimica acta
Print ISSN 0013-4686
Electronic ISSN 1873-3859
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 289
Pages 333-341
Institution Citation NIE, Y., LI, W., PAN, J., SENTHIL, R.A., FERNANDEZ, C., KHAN, A., SUN, Y. and LIU, J. 2018. Preparation of 3D spherical Ni/Al LDHs with significantly enhanced electrochemical performance as a superior cathode material for Ni/MH batteries. Electrochimica acta [online], 289, pages 333-341. Available from: https://doi.org/10.1016/j.electacta.2018.09.043
DOI https://doi.org/10.1016/j.electacta.2018.09.043
Keywords Ni/Al LDHs; Ni/MH battery; 3D nano structure; Cathode material; High charge discharge speed

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