SDBS Intercalation and Adsorption Synergistically Enhance the Electrochemical Performance of Flaky Nickel-Cobalt Hydroxide
LIU Zhiwei*, WU Chan, TI Xinsen, LIU Youzhi
Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, School of Chemistry and Chemical Engineering, North University of China, Taiyuan 030051, China
Abstract: Nickel-cobalt layered double hydroxide (Ni-Co LDH) has a high theoretical specific capacity and rich chemically active sites. However, flaky Ni-Co LDH has problems such as low specific capacity and poor rate capability. To address these problems, this work adopts a solvent thermal method to prepare Ni-Co LDH electrode materials, and an aqueous solution of sodium dodecylbenzene sulfonate (SDBS) as the intercalator. The morphological structure and electrochemical properties of the electrode materials before and after liquid-phase intercalation have been investigated. It is found that the SDBS intercalation and adsorption can expand the layer spacing of Ni-Co LDH, enhance the surface activity of electrode materials, and thus accelerate the diffusion of electrolyte ions, improving its specific capacity and rate capability. The specific capacity of the mo-dified Ni-Co LDH was 677 C/g (1 504 F/g, 2 A/g), and its capacity retention rate was 72% (1—30 A/g), which was significantly better than that of the unmodified material. In addition, the electrochemical kinetic analysis further shows that the SDBS intercalation and adsorption substantially improve the capacity contribution of Ni-Co LDH battery-type electrode material. Finally, the enhanced Ni-Co LDH was used as the positive electrode material and activated carbon (AC) as the negative electrode material to assemble a hybrid capacitor. It had a high energy density of 46 Wh/kg at a power density of 363 W/kg. This work proposes an idea of SDBS intercalation and adsorption to enhance the electrochemical performance of Ni-Co LDH, which can be used as a reference for synthesizing high-performance electrode materials.
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2025, Vol. 39 
