Solvent-free dry powder coating process for low-cost manufacturing of LiNi1/3Mn1/3Co1/3O2 cathodes in lithium-ion batteries
Solvent-free dry powder coating process for low-cost manufacturing of LiNi1/3Mn1/3Co1/3O2 cathodes in lithium-ion batteries
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DOI：
10.1016/j.jpowsour.2017.03.131
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发表时间：
2017-06-01
影响因子：
9.2
通讯作者：
Cheng, Yang-Tse
中科院分区：
文献类型：
--
作者：
Al-Shroofy, Mohanad;Zhang, Qinglin;Cheng, Yang-Tse
报道了一种无溶剂干粉包覆法制备锂离子电池正极材料LiNi_（1/3）Mn_（1/3）Co_（1/3）O_2（NMC）。该工艺消除了挥发性有机化合物的排放，并将热固化时间从数小时缩短至数分钟。将NMC、炭黑和聚（偏二氟乙烯）的混合物静电喷涂到铝集电器上，形成具有可控厚度和孔隙率的均匀分布的电极。当以C/5的速率在3.0和4.3V之间测试电极时，锂离子半电池中的干粉末涂覆的电极的充电/放电循环产生155 mAh g（-1）的放电比容量和80%的容量保持率超过300次循环。干粉末涂覆的电极的长期循环性能和耐久性与通过常规的基于湿浆料的方法制备的那些类似。与传统的基于湿浆料的电极制造方法相比，这种无溶剂干粉涂覆方法是潜在的更低成本、更高产量和更环保的制造方法。(C)2017爱思唯尔B. V.保留所有权利。
We report a solvent-free dry powder coating process for making LiNi1/3Mn1/3Co1/3O2 (NMC) positive electrodes in lithium-ion batteries. This process eliminates volatile organic compound emission and reduces thermal curing time from hours to minutes. A mixture of NMC, carbon black, and poly(vinylidene difluoride) was electrostatically sprayed onto an aluminum current collector, forming a uniformly distributed electrode with controllable thickness and porosity. Charge/discharge cycling of the dry powder-coated electrodes in lithium-ion half cells yielded a discharge specific capacity of 155 mAh g(-1) and capacity retention of 80% for more than 300 cycles when the electrodes were tested between 3.0 and 4.3 V at a rate of C/5. The long-term cycling performance and durability of dry-powder coated electrodes are similar to those made by the conventional wet slurry-based method. This solvent-free dry powder coating process is a potentially lower-cost, higher-throughput, and more environmentally friendly manufacturing process compared with the conventional wet slurry-based electrode manufacturing method. (C) 2017 Elsevier B.V. All rights reserved.