Monochromatic “Photoinitibitor”‐Mediated Holographic Photopolymer Electrolytes for Lithium‐Ion Batteries

Abstract

A new polymer electrolyte based on holographic photopolymer is designed and fabricated. Ethylene carbonate (EC) and propylene carbonate (PC) are introduced as the photoinert substances. Upon laser‐interference‐pattern illumination, photopolymerization occurs within the constructive regions which subsequently results in a phase separation between the photogenerated polymer and unreacted EC–PC, affording holographic photopolymer electrolytes (HPEs) with a pitch of ≈740 nm. Interestingly, both diffraction efficiency and ionic conductivity increase with an augmentation of the EC–PC content. With 50 wt% of EC–PC, the diffraction efficiency and ionic conductivity are ≈60% and 2.13 × 10 −4 S cm −1 at 30 °C, respectively, which are 60 times and 5 orders of magnitude larger than the electrolyte without EC–PC. Notably, the HPEs afford better anisotropy and more stable electrochemical properties when incorporating N , N ‐dimethylacrylamide. The HPEs exhibit good toughness under bending, excellent optical transparency under ambient conditions, and astonishing capabilities of reconstructing colored images. The HPEs here open a door to design flexible and transparent electronics with good mechanical, electrical, and optical functions.

Facile Fabrication of Polymer Electrolytes via Lithium Salt-Accelerated Thiol-Michael Addition for Lithium-Ion Batteries

“…The increasing demand for electric vehicles and efficient energy storage devices promotes the development of rechargeable batteries with high energy density and long cycle life. − However, lithium-ion batteries (LIBs) with liquid organic electrolytes have brought security and reliability concerns owing to inherent limitations such as high volatility, leaks, and explosions. , It is thus expected that replacing conventional liquid organic electrolytes with polymer electrolytes (PEs) can improve the Li-based battery safety, performance, and machinability. − Poly­(ethylene oxide) (PEO) has been most widely studied for PE systems because of its high dielectric constant and ability to form a complex with lithium salts. , Nevertheless, lithium-salt-doped PEO exhibits low ionic conductivity at room temperature originating from its semicrystalline nature, which hampers the transport of lithium ions through the polymer chain segments . Building a cross-linked framework − or loading inorganic components into the polymer matrices − can efficiently improve ionic conductivity by inhibiting crystallization and simultaneously enhance the mechanical properties of the PEs.…”

Effect of ketyl radical on the structure and performance of holographic polymer/liquid-crystal composites

“…Holography is a powerful technique that encodes information via the wave field interference [1]. Due to its unique capability of simultaneously reconstructing the whole information of coherent waves (e.g., amplitude, phase and polarization), holography has become a con-stant innovation source in ultrafast temporal imaging [2,3], optical shaping [4,5], particle assembly [6,7], threedimensional (3D) display [8,9], colored 3D image storage [10][11][12][13][14][15][16], and holographic polymer electrolyte construction [17]. On the other hand, polymer/liquid-crystal (LC) composites have attracted considerable attention due to their unique electro-optic response capability [18][19][20][21].…”

Lithium Salt-Induced In Situ Living Radical Polymerizations Enable Polymer Electrolytes for Lithium-Ion Batteries

“…However, the inherent safety hazards of commercialized liquid electrolytes, including leakage, combustion, and explosion, limit their further development and application. − An alternative route is the employment of polymer electrolytes (PEs), which possess excellent safety and high flexibility as well as thermal and chemical stabilities. − The electrochemical properties of PEs are closely related to the composition and morphology of the polymer matrix, lithium salt, and other added components. The structure of the polymer matrix determines the ionic conduction and mechanical properties of the PEs. − The robust mechanical strength of PEs can inhibit the growth of lithium dendrites and protect lithium cathodes, resulting in a higher current density and fast charging. − In addition, the electrochemical stability window and compatibility between PEs and the electrode are also necessary factors for an ideal PE. , …”