PolarClean & dimethyl isosorbide: green matches in formulating cathode slurry
PolarClean & dimethyl isosorbide: green matches in formulating cathode slurry
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极地清洁
DOI：
10.1039/d2ya00161f
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Marbella, Lauren E.
中科院分区：
文献类型：
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作者：
Sarkar, Amrita;May, Richard;Valmonte, Zoren;Marbella, Lauren E.
本文报道了两种绿色有机溶剂在LiNi 1/3Co 1/3 Mn 1/3 O2（NMC 111）基浆料制备及后续锂离子电池正极制备中的应用。用5-（二甲氨基）-2-甲基-5-氧代戊酸甲酯（PolarClean）和二甲基异山梨醇（DMC）制备的NMC 111、导电碳和聚（偏二氟乙烯）粘合剂复合浆料表现出机械稳定、无裂纹的均匀涂层结构。两种浆料显示出类似的剪切稀化粘度行为，这表明在电极铸造和涂覆期间类似的可加工性。当用作Li/NMC 111半电池的阴极时，用PolarClean制备的电极浆料显示出良好的电化学性能指标，在100次循环中，C/10下的平均比电荷容量为155 ± 1 mA h g−1，与用传统N-甲基吡咯烷酮（NMP）溶剂制备的膜（C/10下为152 ± 3 mA h g−1）相当。PolarClean的使用指出了在不改变制造工艺的情况下在阴极制造中替代有毒NMP的潜在途径。然而，用Na 2SO 4制备的电极表现出较差的电化学性能，平均充电容量为120 mA h g-1。尽管如此，镁合金仍然可以提供一些有前途的功能，并保证进一步详细的调查，在兼容的电解质，定制的浆料制备，和铸造条件。
In this study, two green organic solvents are reported in LiNi1/3Co1/3Mn1/3O2 (NMC111)-based slurry preparation and subsequent cathode fabrication for Li ion batteries. NMC111, conductive carbon and poly(vinylidene fluoride) binder composite slurries prepared with methyl-5-(dimethylamino)-2-methyl-5-oxopentanoate (PolarClean) and dimethyl isosorbide (DMI) exhibit mechanically stable, crack-free uniform coating structures. Both slurries showed similar shear-thinning viscosity behavior that suggests similar processibility during electrode casting and coating. When used as the cathode in Li/NMC111 half cells, the electrode slurries prepared with PolarClean show promising electrochemical performance metrics with an average specific charge capacity of 155 ± 1 mA h g−1 at C/10 over 100 cycles, comparable to the films (152 ± 3 mA h g−1 at C/10) prepared with traditional N-methyl pyrrolidone (NMP) solvent. The use of PolarClean points to a potential route to replace toxic NMP in cathode fabrication without altering the manufacturing process. However, electrodes prepared with DMI demonstrate inferior electrochemical performance with an average charge capacity of 120 mA h g−1. Nonetheless, DMI may still offer some promising features and warrants further detailed investigation in terms of compatible electrolyte, tailoring the slurry preparation, and casting conditions.