RESEARCH OF VON-AMPE CYCLIC VOLTAMMETRY CHARACTERISTICS OF LaNi5-xGex ALLOYS USE AS NEGATIVE ELECTRODE IN Ni-MH RECHARGEABLE BATTERIES
Abstract
In this paper, we present a study on the effect of partial substitution of Ge element for Ni in LaNi5 alloy on the Von-Ampere cyclic vontammetry characteristics of the negative electrode MH in the Ni-MH rechargeable battery. LaNi5-xGex alloy (x = 0.1 ÷ 0.5) is made by arc melting method in Argon gas atmosphere. The electrode chargre-discharge measurement results performed on the Bi-Potentiostat 336A device show that, with partial substitution of the Ge element for Ni, the Von-Ampere cyclic vontammtry of the LaNi5-xGex alloy is similar to the original LaNi5 sample. To see more clearly the effect of the replacement Ge concentration on the electrode charge-discharge process, GRES software was used to calculate the maxium density Jmax and charge Q of the samples. The results show that, during the hydrogen storage process of the negative electrode, both the maximum discharge current density Jmax and charge Q increase in the initial discharge cycles and gradually stabilize after 30 cycles. The increase in the maxium current density Jmax and the charge Q indicates the need for initial activation cycles of the electrode prior to use.
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