Study of early cycling deterioration of a Ni/MH battery by electrochemical impedance spectroscopy

Shaoan Cheng, Jianqing Zhang, Hong Liu, Yongjun Leng, Anbao Yuan, Chunan Cao

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


a.c. impedance measurements are made on spiral-wound, size 4/5A, Ni/MH batteries, which are prepared by using direct-seal technology. Both the positive and the negative electrodes are fabricated by filling in a porous nickel substrate with the active materials. The main purpose of the investigation is to determine the cause(s) of the early cycling deterioration of this foam-type battery. The results demonstrate that the cycle-life curve can be divided into three parts. After little change in capacity and voltage, deterioration of the Ni/MH battery occurs as the voltage performance decreases. This is followed by a sharp decrease in both the discharge capacity and the voltage performance. The decrease in voltage performance is due to drying of the separator, which increases the total ohmic resistance of the battery, while the decrease of discharge capacity is due to an inactive surface that increases the charge-transfer resistance of the battery.

Original languageEnglish (US)
Pages (from-to)155-157
Number of pages3
JournalJournal of Power Sources
Issue number1
StatePublished - Jul 15 1998

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering


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