Journal
JOURNAL OF POWER SOURCES
Volume 352, Issue -, Pages 187-193Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2017.03.131
Keywords
Solvent-free; Lithium-ion battery; Cathode materials; NMC; Dry-powder-coated
Funding
- US National Science Foundation [1355438]
- Iraqi Government
- Directorate For Engineering [1125998] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn [1125998] Funding Source: National Science Foundation
- Office Of The Director
- Office of Integrative Activities [1355438] Funding Source: National Science Foundation
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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.
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