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_aCo_bAl_1−a−bO₂ (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.

中文翻译：

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用 TiOx 和 Li2CO3 对 LiNiaCobAl1−a−bO2 (a > 0.85) 阴极进行表面双涂层，以将水基混合聚合物粘合剂应用于锂离子电池

最近，一种水性聚合物粘合剂受到了广泛关注，因为它简化了锂离子电池（LIB）的生产过程并降低了成本。在具有高电压和高容量的LiNi _a Co _b Al _{1- a - b} O ₂ ( a > 0.85, NCA) 正极的表面涂有水不溶性氧化钛 (TiO _x ) 和 Li ₂ CO ₃层，保护NCA表面免受其生产过程中与水接触造成的损坏。_二氧化钛首先用滚动流化床制粒/包衣机将层涂覆在NCA颗粒表面上，以生产TiO _x包衣的NCA。然而，TiO _x层不能完全覆盖 NCA 表面。接下来，以Li ₂ CO ₃通过反应形成为理由，通过在TiO _{x涂覆的NCA水性浆料中鼓泡CO 2}气体来用Li ₂ CO ₃层涂覆TiO _{x未涂覆的NCA表面。在 TiO x}未涂覆的 NCA 表面上CO ₃ ^2-离子和残留的 LiOH之间，产生双重涂覆的 NCA 颗粒（TiO_x /Li ₂ CO ₃包覆的NCA颗粒）。Li ₂ CO ₃涂层被认为发生在TiO _x层以及TiO _x未涂覆的NCA表面上。结果表明，用 TiO _x和 Li ₂ CO ₃对 NCA 表面进行双涂层使得 NCA 表面具有高耐水性，因此 TiO _x /Li ₂ CO ₃使用水基粘合剂制备的包覆 NCA 粒子阴极具有与使用传统有机溶剂基聚偏二氟乙烯粘合剂制备的“不接触水”的 NCA 粒子阴极相同的充电/放电性能。