Effects of gelation behavior of PPC-based electrolyte on electrochemical performance of solid state lithium battery

He, Te-te; Jing, Maoxiang; Yang, Hua; Chen, Hao; Song, Hua; Ju, Bowei; Zhou, Qian; Tu, Feiyue; Shen, Xiangqian; Qin, Shibiao

doi:10.1007/s42452-019-0213-1

Cited by 9 publications

(7 citation statements)

References 27 publications

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“…In fact, it is found that only when lithium metal is used is the measured conductivity high, whereas the commonly used stainless steel blocking electrode does not reproduce such results. Recently, the same group found that PPC is prone to decomposition upon heating with lithium metal and tends to form low molecular weight polymers or even PC monomers, which could serve as plasticizers, , and therefore, the surprisingly high ion conductivity of PPC-based CPEs should be attributed to the small molecules that lead to actual GPEs. Such GPEs supported a solid LiFePO 4 /Li battery and delivered excellent rate capability (5 C) and superior cycling stability (95%) at ambient temperature.…”

Section: Composite Solid Electrolytesmentioning

confidence: 99%

Mobile Ions in Composite Solids

et al. 2020

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Fast ion conduction in solid-state matrices constitutes the foundation for a wide spectrum of electrochemical systems that use solid electrolytes (SEs), examples of which include solid-state batteries (SSBs), solid oxide fuel cells (SOFCs), and diversified gas sensors. Mixing different solid conductors to form composite solid electrolytes (CSEs) introduces unique opportunities for SEs to possess exceptional overall performance far superior to their individual parental solids, thanks to the abundant chemistry and physics at the new interfaces thus created. In this review, we provide a comprehensive and in-depth examination of the development and understanding of CSEs for SSBs, with special focus on their physiochemical properties and mechanisms of ion transport therein. The origin of the enhanced ionic conductivity in CSEs relative to their single-phase parents is discussed in the context of defect chemistry and interfacial reactions. The models/theories for ion movement in diversified composites are critically reviewed to interrogate a general strategy to the design of novel CSEs, while properties such as mechanical strength and electrochemical stability are discussed in view of their perspective applications in lithium metal batteries and beyond. As an integral component of understanding how ions interact with their composite environments, characterization techniques to probe the ion transport kinetics across different temporal and spatial time scales are also summarized.

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Section: Composite Solid Electrolytesmentioning

confidence: 99%

Mobile Ions in Composite Solids

et al. 2020

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“…The solid polymer electrolytes (SPEs) have attracted huge attention in the last four decades and now matured enough owing to their tremendous technological importance established in the development of flexible-type all-solid-state advanced ion-conducting devices (i.e., rechargeable batteries, fuel cells, supercapacitors, solar cells, sensors, and so forth) [1][2][3][4][5][6][7][8][9][10]. These materials are novel and advantageous over their liquid counterparts especially relevant to the battery applications because they have adequate ionic conductivity and numerous other fascinating features like wide operating temperature range, lightweight, good shelf life, high energy density, leakage-free, ease of preparation, the flexibility of miniaturization, reduced flammability, low toxicity, good stability during the charge-discharge cycles, as well as appreciable mechanical and thermal stabilities [2,4,[8][9][10]. So far, a variety of SPEs including nanocomposite SPEs (NSPEs), plasticized SPEs (PSPEs), and plasticized nanocomposite SPEs (PNSPEs) have been beautifully developed with stateof-the-art, and their technological significance has been greatly appreciated with breakthroughs in the energy storing devices (batteries and supercapacitors) [2, 3, 6-8, 10, 11].…”

Section: Introductionmentioning

confidence: 99%

“…So far, a variety of SPEs including nanocomposite SPEs (NSPEs), plasticized SPEs (PSPEs), and plasticized nanocomposite SPEs (PNSPEs) have been beautifully developed with stateof-the-art, and their technological significance has been greatly appreciated with breakthroughs in the energy storing devices (batteries and supercapacitors) [2, 3, 6-8, 10, 11]. At the early stage of the development of solid-state electrolyte materials, they exhibited some drawbacks from the technology point of view and therefore tremendous efforts have been made in the last decade researches to overcome the drawbacks and are thoroughly addressed in several recent reviews [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Dielectric polarization and relaxation processes of the lithium-ion conducting PEO/PVDF blend matrix-based electrolytes: effect of TiO2 nanofiller

Dhatarwal

Sengwa

2020

SN Appl. Sci.

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The effect of TiO 2 nanofiller concentration on the dielectric polarization and relaxation processes of (75PEO/25PVDF)/25 wt% LiClO 4-x wt% TiO 2 (x = 0, 2, 5, 10, 15, and 20) compositions based nanocomposite solid polymer electrolyte (NSPE) films has been investigated by employing the dielectric relaxation spectroscopy. The SEM micrographs demonstrate that the dispersion of TiO 2 nanoparticles enormously alters the spherulitic morphology with the development of some cracks, pores, and wrinkles of these solution-cast prepared NSPE films. The X-ray diffraction study confirms that the heterostructures of these NSPE materials are semicrystalline and their degree of crystallinity increases irregularly with the increase of TiO 2 concentration, however the crystallinity of host polymer blend matrix of these electrolytes decreases. The complex dielectric permittivity spectra of these NSPE materials in the frequency range from 20 Hz to 1 MHz at 27 °C reveal that there is a dominant contribution of electrode polarization and interfacial polarization at lower frequencies, whereas the high frequency permittivity values attribute to dipolar and ionic polarizations. Four types of relaxation processes have been probed by the 'master curve representation' of the dielectric and electrical spectra of these solid ion-dipole complexes. It is observed that the addition of TiO 2 nanoparticles up to 10 wt% in these electrolytes influences the dielectric properties anomalously, but a huge decrease in the dielectric polarization and increase in the relaxation times are noted resulting in a significant decrease in the ionic conductivity of the film at 20 wt% TiO 2 concentration. The dependence of dc ionic conductivity of these lithium-ion conducting NSPE materials on the chain segmental relaxation time and also the degree of crystallinity has been explored. The results of these NSPE materials have also been compared with the TiO 2 nanoparticles loaded different polymer matrices and salts based electrolytes and discussed appropriately. These lithium-ion based electrolyte films are accredited for the solid-state ion-conducting energy storing devices from their electrochemical parameters characterized by LSV, CV, and CA techniques.

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“…The oxidation electrode potential is related to the Fermi level of a polymer electrolyte . Among common polymer electrolytes, those with carbonyl group are stable at moderately high voltage (e.g., 4–4.5 V vs Li + /Li), , but polymers with an ether group are widely accepted to be unstable above 4 V vs Li + /Li, such as PEO . Because PEO is widely studied, and it has been commercialized in 3 V Li/LiFePO 4 (LFP) batteries, addressing the interfacial stability between 4 V cathodes (e.g., NCM and LiCoO 2 /LCO) and PEO has the potential to enable practical 4 V solid-state batteries in the future.…”

mentioning

confidence: 99%