Low‐Cost and Heat‐Resistant Poly(catechol/polyamine)‐Silica Composite Membrane for High‐Performance Lithium‐Ion Batteries

Abstract

A composite membrane based on SiO 2 and a low-cost poly (catechol/polyamine) (PCPA) multicomponent system was prepared by using a simple dip-coating processes. The results indicate that the formation of an inorganic/organic composite coating on the surface of the polyethylene (PE) separator is beneficial for improving the comprehensive performance, especially for the thermal stability and wettability. Compared to the PE separator, the thermal stability of the PE@SiO 2 -PCPA composite membrane is greatly improved, showing a higher decomposition temperature (426°C) and a smaller heat shrinkage rate at 160°C. Moreover, the Li/LiCoO 2 battery assembled with the PE@SiO 2 -PCPA composite membrane shows an excellent initial discharge capacity and a remarkable capacity retention (171.5 mAh g À 1 , 86.1 %) at 4.4 V after 200 cycles at 0.5 C, which much higher than the PE membrane (165.2 mAh g À 1 , 61.4 %). This study provides a potential application for membranes with low cost, high thermal stability, and good wettability in the field of lithium-ion batteries.

Achieving High Thermal Conductivity and Satisfactory Insulating Properties of Elastomer Composites by Self-Assembling BN@GO Hybrids

“…A possible reaction mechanism for the PCPA has been added to Figure 1 b. First, the catechol was oxidized into quinoid structures in an alkalescent tris-acid buffer solution, and then the generated quinoid structures react with polyamine through Michael addition or Schiff base reactions to form an intermolecularly cross-linked PCPA network, which is finally deposited on the surfaces of the hBN platelets [ 21 ].…”

Hierarchical self‐assembly of tannic acid/diethylenetriamine on polypropylene for high‐performance separator

“…Because of the lack of polar groups in the separator itself, the low surface energy results in poor wettability to the liquid electrolyte and the inability of the electrolyte to be effectively absorbed and retained, which impairs the cycle life and rate performance of LIBs. [11][12][13] These issues have emerged as significant hurdles in the quest for the safe and highpower advancement of lithium-ion batteries. Therefore, it is crucial to develop a novel separator that exhibits excellent porosity, thermal stability, and effective wetting characteristics for liquid electrolytes.…”

“…However, these polyolefin separators still have some disadvantages. Because of the lack of polar groups in the separator itself, the low surface energy results in poor wettability to the liquid electrolyte and the inability of the electrolyte to be effectively absorbed and retained, which impairs the cycle life and rate performance of LIBs 11–13 . These issues have emerged as significant hurdles in the quest for the safe and high‐power advancement of lithium‐ion batteries.…”