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Article Navigation> JOURNAL OF BEIJING INSTITUTE OF TECHNOLOGY> 2005> 14(4): 438-441
LI Li, WU Feng, CHEN Ren-jie, CHEN Shi. Effect of Overcharge on Electrochemical Performance of Sealed-Type Nickel/Metal Hydride Batteries[J]. JOURNAL OF BEIJING INSTITUTE OF TECHNOLOGY, 2005, 14(4): 438-441.
Citation: LI Li, WU Feng, CHEN Ren-jie, CHEN Shi. Effect of Overcharge on Electrochemical Performance of Sealed-Type Nickel/Metal Hydride Batteries[J].JOURNAL OF BEIJING INSTITUTE OF TECHNOLOGY, 2005, 14(4): 438-441.
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Effect of Overcharge on Electrochemical Performance of Sealed-Type Nickel/Metal Hydride Batteries

  • School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, China

  • Received Date:2004-04-27
    Abstract
  • The effects of overcharge on electrochemical performance of AA size sealed-type nickel/metal hydride(Ni/MH) batteries and its degradation mechanism were investigated. The results indicated that the relationship between the effects of different overcharge currents on the increasing velocity of inner pressure and the degradation velocity of cycle life and discharge voltage remains in almost direct proportion. After overcharge cycles, the positive electrode materials remain the original structure, but there occur some breaks because of the irreversible expand of crystal lattice. And the negative electrode alloy particles have inconspicuous pulverization, but are covered with lots of corrosive products and its main component is rare earth hydroxide or oxide. These are all the main reasons leading to the degradation behavior of the discharge capacity and cycle life of Ni/MH batteries.
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