Surface double coating of a LiNiaCobAl1−a−bO2 (a > 0.85) cathode with TiOx and Li2CO3 to apply a water-based hybrid polymer binder to Li-ion batteries. Issue 23 (3rd April 2020)

• Record Type: Journal Article
• Authors: Watanabe, Tatsuya; Hirai, Kouji; Ando, Fuma; Kurosumi, Shoudai; Ugawa, Shinsaku; Lee, Hojin; Irii, Yuta; Maki, Fumihiko; Gunji, Takao; Wu, Jianfei; Ohsaka, Takao; Matsumoto, Futoshi
• Is Part Of: RSC advances. Volume 10:Issue 23(2020)
• Page Start: 13642
• Page End: 13654
• Publication Date: 2020-04-03
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0ra00197j
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : 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. Abstract : 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 Li2 CO3 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 Li2 CO3 layer was conducted by bubbling CO2 gas in the TiO x -coated NCA aqueous slurry on the grounds that Li2 CO3 is formed through the reaction between CO3 2− ions and residual LiOH on the TiO x -uncoated NCA surface, resulting in the doubly coated NCA particles (TiO x /Li2 CO3 -coated NCA particles). The Li2 CO3 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 Li2 CO3 allows for a high water-resistance of the NCA surface and consequently the TiO x /Li2 CO3 -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.