Novel polyimide binder for achieving high-rate capability and long-term cycling stability of LiNi0.8Co0.1Mn0.1O2 cathode via constructing polar and micro-branched crosslinking network structure

A multifunctional polyimide enabled high performance silicon composite anode materials for Li-Ion batteries

Although the high‐capacity Si/graphite anode serves to advance the energy density of lithium‐ion batteries, the volume change remains the main disfigurement of Si/graphite anode. Many studies show that crosslinked structure binders tend to play a good inhibitory effect on volume expansion. In this work, a three‐dimensionally covalently cross‐linked and flexible polyimides (C–PI–OH) is successfully synthesized and applied as silicon/graphite anode, which is composed through a tri‐monomer co‐polycondensation and crosslinking process. The as‐formed free carboxylic acid groups and amide groups in C–PI–OH are efficient in structural stability, so the electrode bound by C–PI–OH exhibits the highest peeling strength than C–PI and polyvinylidene fluoride. The flexible network of the C–PI–OH binder is competent for accommodating the volume expansion and contraction of silicon particles during the deintercalation of lithium ion, which helps in the wholeness of solid electrolyte interface film and electrodes, and effectively boosting the cycle stability of the Si/graphite anode.

A flexible network polyimides binder for Si/graphite composite electrode in lithium‐ion batteries

Abstract Lithium-ion batteries (LIBs) have helped revolutionize the modern world and are now advancing the alternative energy field. Several technical challenges are associated with LIBs, such as increasing their energy density, improving their safety, and prolonging their lifespan. Pressed by these issues, researchers are striving to find effective solutions and new materials for next-generation LIBs. Polymers play a more and more important role in satisfying the ever-increasing requirements for LIBs. Polyimides (PIs), a special functional polymer, possess unparalleled advantages, such as excellent mechanical strength, extremely high thermal stability, and excellent chemical inertness; they are a promising material for LIBs. Herein, we discuss the current applications of PIs in LIBs, including coatings, separators, binders, solid-state polymer electrolytes, and active storage materials, to improve high-voltage performance, safety, cyclability, flexibility, and sustainability. Existing technical challenges are described, and strategies for solving current issues are proposed. Finally, potential directions for implementing PIs in LIBs are outlined. 

https://link.springer.com/content/pdf/10.1007/s40820-023-01104-7.pdf

Polyimides as Promising Materials for Lithium-Ion Batteries: A Review

Improving the electrochemical performance of LiFePO4 cathode with novel water-soluble binders

https://iopscience.iop.org/article/10.1149/1945-7111/ac28c4/pdf

Mengqi Zhu

Papers

Review—Long-Term Cyclability of High-Temperature Stable Polyimide in LIBs