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首页> 外文期刊>International Journal of Electrochemical Science >Effect of Ball Milling on the Electrochemical Performance of Li1.02Ni0.4Co0.2Mn0.4O2 Cathode Synthesized by Citric Acid- Assisted Sol-Gel Process
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Effect of Ball Milling on the Electrochemical Performance of Li1.02Ni0.4Co0.2Mn0.4O2 Cathode Synthesized by Citric Acid- Assisted Sol-Gel Process

机译：球磨对Li 1.02 Ni 0.4 Co 0.2 Mn 0.4 O 2电化学性能的影响柠檬酸辅助溶胶-凝胶法合成阴极

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摘要

Layered-type Li1.02Ni0.4Co0.2Mn0.4O2 material has been synthesized by citric acid -assisted sol gelprocess. The resulting material was characterized by X-ray diffraction, scanning electron microscopy,charge-discharge measurements and impedance spectroscopy. The cathodes were prepared with carbonby hand grinding and ball milling. At a 0.1 C- rate and between 2.5 and 4.3 V, the hand-ground andball-milled Li1.02Ni0.4Co0.2Mn0.4O2 samples delivered a first-cycle discharge capacity of 156 mAh/gand 167 mAh/g, respectively. At a high C-rate of 8C, the ball-milled sample gave a capacity of 133mAh/g which was significantly higher than the capacity obtained from hand-ground sample (115mAh/g). In a 50-cycle test at 8C, the capacity retention of hand-ground and ball-milled samples wascalculated as 75% and 87%, respectively. Ball milling the active material with carbon resulted inenhanced capacity, rate capability and cycleability due to significant decrease in the contact resistancebetween Li1.02Ni0.4Co0.2Mn0.4O2 and carbon particles.
机译：通过柠檬酸辅助溶胶凝胶法合成了层状Li1.02Ni0.4Co0.2Mn0.4O2材料。通过X射线衍射，扫描电子显微镜，充放电测量和阻抗谱对所得材料进行表征。用碳通过手工研磨和球磨制备阴极。在0.1 C速率和2.5至4.3 V之间，手工研磨和球磨过的Li1.02Ni0.4Co0.2Mn0.4O2样品的第一循环放电容量分别为156 mAh / g和167 mAh / g。在8 C的高C速率下，球磨样品的容量为133mAh / g，大大高于手磨样品的容量（115mAh / g）。在8C的50个循环测试中，手工研磨和球磨样品的容量保持率分别计算为75％和87％。由于Li1.02Ni0.4Co0.2Mn0.4O2与碳颗粒之间的接触电阻显着降低，因此用碳进行球磨将活性材料提高了容量，倍率能力和循环能力。

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