自然科学版 英文版
自然科学版 英文版
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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 10    October 2016

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Effect of binary conductive additive mixtures on electrochemical performance of polyoxomolybdate as cathode material of lithium ion battery
LI Wen-liang(李文良)1, 2, NI Er-fu(倪尔福)2, LI Xin-hai(李新海)1, GUO Hua-jun(郭华军)1

1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Highpower International Inc., Xinxia Road, Pinghu Town, Longgang District, Shenzhen 518111, China

Abstract:Binary carbon mixtures, carbon black ECP 600JD (ECP) combined with vapor grown carbon fiber (VGCF) or carbon nanotube (CNT), or graphene (Gr) in different mass ratios, are investigated as the conductive additives for the cathode material polyoxomolybadate Na3[AlMo6O24H6] (NAM). Field emission scanning electron microscopy and energy dispersive X-ray spectroscopy show that the surfaces of NAM particles are covered homogeneously with the binary conductive additive mixtures except the combination of ECP and CNT. The optimum combination is the mixture of ECP and VGCF, which shows higher discharge capacity than the combinations of ECP and CNT or Gr. Initial discharge capacities of 364, 339, and 291 mA·h/g are obtained by the combination of ECP and VGCF in the mass ratios of 2:1, 1:1, and 1:2, respectively. The results of electrochemical impedance spectra and 4-pin probe measurements demonstrate that the combination of ECP and VGCF exhibits the highest electrical conductivity for the electrode.

 

Key words: lithium ion battery; cathode; Na3[AlMo6O24H6] (NAM); conductive additive

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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