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Wang B.-P.,Beifang University of Nationalities | Wang B.-P.,Kocel New Energy Material Ltd
Chinese Rare Earths | Year: 2015

(La1-xNdx)0.8Mg0.2Ni3.4Al0.1 (x=0~0.4) electrode alloys were prepared by inductive melting method. The effects of Nd substitution for La on structure and electrochemical property of the alloys were investigated. XRD analysis indicated that the alloys consisted of multi-phases, and the main phase varied from (La,Mg)2Ni7 phase to (La,Mg)5Ni19 phase with the increase of Nd. The electrochemical investigations indicated that the discharge capacity first increased then decreased. When x equalled to 0.1, the maximum discharge capacity reached 365.0 mAh·g-1. At the same time, the cyclic performance and high rate dischargeability decreased with the addition of Nd. ©, 5015, Editorial Office of Chinese Rare Earths. All right reserved.

Wang B.,Kocel New Energy Material Company | Zhao L.,Kocel New Energy Material Company | Cai C.,Jinchuan Group Ltd. | Wang S.,Jinchuan Group Ltd.
International Journal of Hydrogen Energy | Year: 2014

The effects of surface coating with polyaniline on electrochemical properties of La0.8Mg0.2Ni3.4Al0.1 electrode alloys were studied in this paper. The flake-shaped polyaniline coatings were deposited on the surface of La0.8Mg 0.2Ni3.4Al0.1 alloy powders by electrodeless deposition. Electrochemical studies showed that the discharge capacity increased to 391.8 mAh g-1 after surface modification with polyaniline, compared to 382.5 mAh g-1 for the bare alloys. The cyclic stability over 100 cycles improved from 81.6% to 87.5%. Also, the kinetic properties were investigated in detail. © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Hou C.-P.,Northwestern Polytechnical University | Hou C.-P.,Kocel New Energy Material Ltd | Ma Y.,Northwestern Polytechnical University | Dong X.-Z.,Northwestern Polytechnical University | And 3 more authors.
Journal of Alloys and Compounds | Year: 2016

A facile method for enhancing electrochemical performances of LiCo1/3Ni1/3Mn1/3O2 cathode material by mixing with Al(OH)3 additives is reported. The commercial 18,650 size Li-ion cells were manufactured based on Al(OH)3-mixed LiCo1/3Ni1/3Mn1/3O2 cathode and artificial graphite anode in a LiPF6-based non-aqueous electrolyte. The cell with Al(OH)3-mixed LiCo1/3Ni1/3Mn1/3O2 cathode exhibits an excellent capacity retention ratio of 63.1% after 300 cycles between 4.3 and 2.75 V at 55 °C, however, that of a pristine cell is only 29.7%. In contrast of the pristine cell, the storage stability of the Al(OH)3-mixed LiCo1/3Ni1/3Mn1/3O2 cell is also enhanced greatly. It is found that reducing unwanted side-reactions on cathode with the electrolyte by adsorbing trace amounts of HF in the electrolyte lead to improvement in the electrochemical performances of Al(OH)3-mixed LiCo1/3Ni1/3Mn1/3O2 cells. © 2015 Elsevier B.V. All rights reserved.

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