Enhanced Electrochemical Performances of Ni Doped Cr₈O₂₁ Cathode Materials for Lithium-ion Batteries

Abstract

Cathode materials, nickel doped Cr₈O₂₁, were synthesized by a solid-state method. The effects of Ni doping on the electrochemical performances of Cr₈O₂₁ were investigated. The experimental results show that the discharge capacities of the samples depend on the nickel contents, which increases firstly and then decreases with increasing Ni contents. Optimized Ni_0.5Cr_7.5O₂₁ delivers a first capacity up to 392.6 mAh·g⁻¹ at 0.1 C. In addition, Ni doped sample also demonstrates enhanced cycling stability and rate capability compared with that of the bare Cr₈O₂₁. At 1 C, an initial discharge capacity of 348.7 mAh·g⁻¹ was achieved for Ni_0.5Cr_7.5O₂₁, much higher than 271.4 mAh·g⁻¹ of the un-doped sample, with an increase of more than 28%. Electrochemical impedance spectroscopy results confirm that Ni doping reduces the growth of interface resistance and charge transfer resistance, which is conducive to the electrochemical kinetic behaviors during charge-discharge.

Keywords

Cr₈O₂₁ / cathode material / doping / electrochemical performances / lithium-ion batteries

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