《Table 1.Electrochemical properties of La Fe O3–xwt%Ni (x=0, 5, 10, 15) electrodes》

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《Enhanced electrochemical properties of LaFeO_3 with Ni modification for MH–Ni batteries》

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Note:S100 is the capacity retention rate after 100 cycles；HRD1500 is the high-rate dischargeability at a discharge current density of 1500m A·g-1.

Fig.3 shows the discharge curves of the La Fe O3–xwt%Ni（x=0，5，10，15）electrodes.The middle discharge voltages and the discharge capacities of Ni-modified La Fe O3 are higher than those of pure La Fe O3，suggesting that the Ni modification effectively improved the electrochemical kinetics and utilization of La Fe O3.These results confirm that the Ni-modified La Fe O3 electrodes exhibit higher power density and higher energy density than unmodified La Fe O3electrodes when used as negative electrode materials for MH–Ni batteries.As the Ni content was increased from 0 to10wt%，the maximum discharge capacity（Cmax）of the LaFe O3–xwt%Ni electrodes was enhanced from 266.8 m Ah·g-1to 339.7 m Ah·g-1（Table 1）.However，when the amount of added Ni was 15wt%（i.e.，the La Fe O3–15wt%Ni electrode），the Cmax decreased to 324.3 m Ah·g-1.Because Ni is an inactive material in MH–Ni batteries，excess Ni in the composites may well decrease the discharge capacity.Thus，the Ni content for the composites should be controlled at an appropriate level to attain high discharge capacity.