Kang Ha Eun, Park Tae Min, Song Sung Geun, Yoon Young Soo, Lee Sang Jin
Department of Materials Science & Engineering, Gachon University, Seongnam-si 13120, Republic of Korea.
Department of Advanced Materials Science & Engineering, Mokpo National University, Muan-gun 58554, Republic of Korea.
Nanomaterials (Basel). 2024 Jun 26;14(13):1096. doi: 10.3390/nano14131096.
The growing need for lithium-ion batteries, fueled by the widespread use of electric vehicles (EVs) and portable electronic devices, requires high energy density and safety. The cathode material Li(NiCoMn)O (NCM) shows promise, but attaining high efficiency necessitates optimization of both composition and manufacturing methods. Polycrystalline LiNiCoMnO powders were synthesized and assessed in this investigation using a polyvinyl alcohol (PVA) solution method. The study examined different synthesis conditions, such as the PVA to metal ions ratio and the molecular weight of PVA, to assess their influence on powder characteristics. Electrochemical analysis indicated that cathode materials synthesized with a relatively high quantity of PVA with a molecular weight of 98,000 exhibited the highest discharge capacity of 170.34 mAh/g and a high lithium-ion diffusion coefficient of 1.19 × 10 cm/s. Moreover, decreasing the PVA content, irrespective of its molecular weight, led to the production of powders with reduced surface areas and increased pore sizes. The adjustments of PVA during synthesis resulted in pre-sintering observed during the synthesis process, which had an impact on the long-term stability of batteries. The electrodes produced from the synthesized powders had a positive impact on the insertion and extraction of Li+ ions, thereby improving the electrochemical performance of the batteries. This study reveals that cathode materials synthesized with a high quantity of PVA with a molecular weight of 98,000 exhibited the highest discharge capacity of 170.34 mAh/g and a high lithium-ion diffusion coefficient of 1.19 × 10 cm/s. The findings underscore the significance of optimizing methods for synthesizing PVA-based materials to enhance the electrochemical properties of NCM cathode materials, contributing to the advancement of lithium-ion battery technology. The findings underscore the significance of optimizing methods for synthesizing PVA-based materials and their influence on the electrochemical properties of NCM cathode materials. This contributes to the continuous progress in lithium-ion battery technology.
电动汽车（EV）和便携式电子设备的广泛使用，使得对锂离子电池的需求不断增长，这就要求电池具备高能量密度和安全性。阴极材料Li(NiCoMn)O（NCM）展现出了潜力，但要实现高效率，就需要对成分和制造方法进行优化。在本研究中，采用聚乙烯醇（PVA）溶液法合成并评估了多晶LiNiCoMnO粉末。该研究考察了不同的合成条件，如PVA与金属离子的比例以及PVA的分子量，以评估它们对粉末特性的影响。电化学分析表明，用分子量为98,000的相对大量PVA合成的阴极材料表现出最高放电容量170.34 mAh/g和高锂离子扩散系数1.19×10 cm/s。此外，无论PVA分子量如何，降低PVA含量都会导致粉末表面积减小和孔径增大。合成过程中PVA的调整导致在合成过程中观察到预烧结现象，这对电池的长期稳定性有影响。由合成粉末制成的电极对Li+离子的嵌入和脱出有积极影响，从而改善了电池的电化学性能。本研究表明，用分子量为98,000的大量PVA合成的阴极材料表现出最高放电容量170.34 mAh/g和高锂离子扩散系数1.19×10 cm/s。这些发现强调了优化基于PVA材料的合成方法对于增强NCM阴极材料电化学性能的重要性，有助于锂离子电池技术的进步。这些发现强调了优化基于PVA材料的合成方法及其对NCM阴极材料电化学性能的影响。这有助于锂离子电池技术的持续进步。
