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Overcharge performance of LiMn2O4/graphite battery with large capacity

  • Yun-jian Liu (刘云建)
  • Xin-hai Li (李新海)Email author
  • Hua-jun Guo (郭华军)
  • Zhi-xing Wang (王志兴)
  • Qi-yang Hu (胡启阳)
  • Wen-jie Peng (彭文杰)
Article

Abstract

The LiMn2O4/graphite battery was fabricated and its 3 C/10 V overcharge performance was studied. Spinel LiMn2O4 was synthesized by solid-state method and 325680-type size full battery was fabricated. The structure and morphology of the powders were characterized by XRD and SEM technique, respectively. The battery explodes after 3 C/10 V overcharged test, and surface temperature of the battery case arrives at 290 °C in 12 s after exploding. Black air is given out with blast. Carbon, MnO, and Li2CO3 are observed in the exploded powders. The cathode electrode remains spinel structure with 5.0 V charged. Cracks in the cathode electrode particles are detected with the increase of voltage by SEM technique. The 5.0 V charged electrode can decompose into Mn3O4 at 400 °C. It is demonstrated that the decomposition of 5.0 V charged electrode can be promoted and Mn4+ can be deoxidized to Mn2+ by carbon and electrolyte through the simulation of blast process.

Key words

LiMn2O4 MnO battery overcharge blast 

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Copyright information

© Central South University Press and Springer Berlin Heidelberg 2009

Authors and Affiliations

  • Yun-jian Liu (刘云建)
    • 1
  • Xin-hai Li (李新海)
    • 1
    Email author
  • Hua-jun Guo (郭华军)
    • 1
  • Zhi-xing Wang (王志兴)
    • 1
  • Qi-yang Hu (胡启阳)
    • 1
  • Wen-jie Peng (彭文杰)
    • 1
  1. 1.School of Metallurgical Science and EngineeringCentral South UniversityChangshaChina

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