| 초록 |
In contrast to noteworthy advancements in cathode active materials for lithium-ion batteries, the development of cathode binders has been relatively slow. This issue is more serious for high-mass-loading cathodes. Here, amphiphilic bottlebrush polymers (BBPs) are designed as a new class of cathode binder material. The BBPs are amphiphilic in nature owing to the hydrophilic poly (acrylic acid) (PAA) sidechains and hydrophobic polynorbornene (PNB) backbones. The PNB backbone allows process compatibility with nonaqueous solvent-based cathode fabrication, while the PAA sidechain provides strong adhesion between active layers and current collectors. Moreover, the PAA sidechain simultaneously chelates transition metal ions dissolved from cathode active materials (LiNi0.8Co0.1Mn0.1O2 (NCM811)) particles. Notably, a high-mass-loading (27 mg cm−2, corresponding to 5.2 mAh cm−2) NCM811 cathode with stable cyclability is achieved with an extremely low content (1 wt%) of the BBP binder. |
