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Molecular Modularized Co-Polyimide as a Water-Processable Multifunctional Binder for High-Performance Si/C Anodes in Lithium-Ion Batteries #MMPMID40590156
Tan W; Liang B; Xiao H; Chen M; Yang W; He X; Hu J; Zeng K; Yang G
ACS Appl Mater Interfaces 2025[Jul]; ä (ä): ä PMID40590156show ga
Micrometer-sized silicon-carbon (Si/C) anode materials with high capacity represent one of the most promising alternatives for achieving a high energy density in lithium-ion batteries. The development of binders that effectively interact with Si/C active materials is crucial for ensuring the stability of the Si/C electrodes. In this study, a water-processable multifunctional copolyimide binder (denoted as SPI-x) comprising three molecular modules was designed. The adenine modules within the molecular chain serve to facilitate hydrogen bonding with the silicon surface of Si/C as well as promote pi-pi interactions with the carbon surface. These dual interfacial interactions contribute significantly to the stability of the electrode structure. Furthermore, lithium sulfonate groups (Li(+) transport module) and flexible segments (entropic elasticity module) enhance lithium ion transport and accommodate volume expansion, respectively. Electrodes incorporating this multifunctional binder exhibited excellent cycling stability and rate performance: after 400 cycles at 0.5 A g(-1), a capacity of 825.2 mAh g(-1) was achieved with a retention of 93.1%. At 2.0 A g(-1), the electrode maintained a high capacity of 701.6 mAh g(-1). Full cells assembled with a LiNi(0.5)Co(0.2)Mn(0.3)O(2) cathode demonstrated a capacity of 150.4 mAh g(-1), with a retention of 92.7% after 300 cycles. This work provides key insights into the development of multifunctional binders for high-energy, long-life lithium-ion batteries.