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Surface double coating of a LiNi a Co b Al 1−a−b O 2 ( a > 0.85) cathode with TiO x and Li 2 CO 3 to apply a water-based hybrid polymer binder to Li-ion batteries

2020; Royal Society of Chemistry; Volume: 10; Issue: 23 Linguagem: Inglês

10.1039/d0ra00197j

2046-2069

Tatsuya Watanabe, Kouji Hirai, Fūma Ando, Shoudai Kurosumi, Shinsaku Ugawa, Hojin Lee, Yuta Irii, Fumihiko Maki, Takao Gunji, Jianfei Wu, Takao Ohsaka, Futoshi Matsumoto,

Extraction and Separation Processes

Recently a water-based polymer binder has been getting much attention because it simplifies the production process of lithium ion batteries (LIBs) and reduce their cost. The surface of LiNi a Co b Al1-a-b O2 (a > 0.85, NCA) cathode with a high voltage and high capacity was coated doubly with water-insoluble titanium oxide (TiO x ) and Li2CO3 layers to protect the NCA surface from the damage caused by contacting with water during its production process. The TiO x layer was at first coated on the NCA particle surface with a tumbling fluidized-bed granulating/coating machine for producing TiO x -coated NCA. However, the TiO x layer could not coat the NCA surface completely. In the next place, the coating of the TiO x -uncoated NCA surface with Li2CO3 layer was conducted by bubbling CO2 gas in the TiO x -coated NCA aqueous slurry on the grounds that Li2CO3 is formed through the reaction between CO32- ions and residual LiOH on the TiO x -uncoated NCA surface, resulting in the doubly coated NCA particles (TiO x /Li2CO3-coated NCA particles). The Li2CO3 coating is considered to take place on the TiO x layer as well as the TiO x -uncoated NCA surface. The results demonstrate that the double coating of the NCA surface with TiO x and Li2CO3 allows for a high water-resistance of the NCA surface and consequently the TiO x /Li2CO3-coated NCA particle cathode prepared with a water-based binder possesses the same charge/discharge performance as that obtained with a "water-uncontacted" NCA particle cathode prepared using the conventional organic solvent-based polyvinylidene difluoride binder.