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首页> 外文会议>EV technology for specialty applications 2019 >Electrochemical Properties of Ni-Rich Cathode Material Using Organic Acid as Chelating Agents for Lithium-Ion Batteries
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Electrochemical Properties of Ni-Rich Cathode Material Using Organic Acid as Chelating Agents for Lithium-Ion Batteries

机译：有机酸作为锂离子电池螯合剂的富镍正极材料的电化学性能

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摘要

For the lithium-ion batteries, cathode materials play an important role in determining their capacity and average voltage of the battery. The commercially manufacturing methods for cathode materials are solid state reaction(SSR), sol-gel, co-precipitation and spray drying method. Among above methods, co-precipitation method is one of the most useful synthetic technology to control particle size and morphology with high tap-density. Ammonia is widely used as a chelating agent during co-precipitation method, it needs to be replaced, since ammonia is highly toxic. In this study, Ni-rich precursors were prepared by using organic acid as chelating agents. The particle size distribution, growth rate, particle morphology and crystalline structure of the prepared precursors were analyzed by PSD, SEM and XRD. The prepared precursors had spherical shape and average particle size of 5-10 μm. The precursors were mixed thoroughly with lithium salt and were subsequently calcined at different calcination temperature to obtain lithiated powder. The particle morphology and crystalline structure of the cathode materials with different calcination temperature were analyzed using SEM and XRD. The electrochemical performance of the coin cell using a cathode material fabricated by co-precipitation method in LiPF6(EC:DEC=1:1 vol%) electrolyte was evaluated by the initial charge/discharge, cycle, cyclic voltammetry and Impedance test. The electrochemical performance of the Ni-rich cathode material was degraded with increasing R-factor. Also, Ni-rich cathode material with lower R-factor showed a higher capacity (=180 mAh/g) and better stability.
机译：对于锂离子电池，正极材料在确定其容量和电池的平均电压方面起着重要作用。阴极材料的商业生产方法是固态反应（SSR），溶胶-凝胶法，共沉淀法和喷雾干燥法。在上述方法中，共沉淀法是最有用的合成技术之一，以高振实密度控制粒径和形貌。氨在共沉淀法中被广泛用作螯合剂，由于氨具有剧毒作用，因此需要更换。在这项研究中，通过使用有机酸作为螯合剂制备了富镍前体。通过PSD，SEM和XRD分析了所制备前驱体的粒径分布，生长速率，颗粒形貌和晶体结构。制备的前体具有球形和5-10μm的平均粒径。将前体与锂盐充分混合，然后在不同的煅烧温度下煅烧以获得锂化粉末。利用SEM和XRD分析了不同煅烧温度下正极材料的颗粒形态和晶体结构。通过初始充电/放电，循环，循环伏安法和阻抗测试，评估了在LiPF6（EC：DEC = 1：1 vol％）电解质中使用共沉淀法制造的正极材料制造的纽扣电池的电化学性能。富镍正极材料的电化学性能随着R因子的增加而降低。而且，具有较低R因子的富镍正极材料显示出更高的容量（= 180 mAh / g）和更好的稳定性。

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  • 会议地点 Strasbourg(FR)
  • 作者

    Hyun Woo Park; Jong Dae Lee;

  • 作者单位

    Chungbuk National University, College of Engineering, Department of Chemical Engineering, 1 Chungdaero, Seowongu, Cheongju, Chungbuk, 28644 South Korea;

    Chungbuk National University, College of Engineering, Department of Chemical Engineering, 1 Chungdaero, Seowongu, Cheongju, Chungbuk, 28644 South Korea;

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