A review on the separators of liquid electrolyte Li-ion batteries

Zhang, Sheng S.

doi:10.1016/j.jpowsour.2006.10.065

Cited by 1,435 publications

(1,163 citation statements)

References 44 publications

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“…However, the side effects of such a separator modification method must be taken into our consideration: it might reduce electrolyte wettability, increase electrochemical impedance and lessen active material utilization in batteries owing to the reduced pore size and increased thickness of the separator. 38,39 In this work, we aim to establish a PS shield onto the separator without jeopardizing the wettability and ionic conductivity of the membrane.…”

Section: Mpbi Functionalized Separatormentioning

confidence: 99%

The dual actions of modified polybenzimidazole in taming the polysulfide shuttle for long-life lithium–sulfur batteries

Wang

Cai

et al. 2016

NPG Asia Mater

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The development of lithium-sulfur (Li-S) batteries is of practical significance to meet the rapidly escalating demand for advanced energy storage technologies with long life and high-energy density. However, the dissolution and shuttling of the intermediate polysulfides (PS) initiates the loss of active sulfur and the poisoning of the lithium anode, leading to unsatisfactory cyclability and consequently hinders the commercialization of Li-S batteries. Herein, we develop a facile strategy to tame the PS dissolution and the shuttling effect in the Li-S system by introducing a modified polybenzimidazole (mPBI) with multiple functions. As a binder, the excellent mechanical property of mPBI endows the sulfur electrode with strong integrity and, therefore, results in high sulfur loading (7.2 mg cm − 2 ), whereas the abundant chemical interaction between mPBI and PS affords efficient PS adsorption to inhibit sulfur loss and prolong battery life. As a functional agent for the separator, the mPBI builds a PS shield onto the separator to block PS's migration to further suppress the PS shuttling. The dual actions of mPBI confer an excellent performance of 750 mAh g − 1 (or 5.2 mAh cm − 2 ) after 500 cycles at C/5 on the Li-S battery with an ultralow capacity fading rate of 0.08% per cycle.

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Section: Mpbi Functionalized Separatormentioning

confidence: 99%

The dual actions of modified polybenzimidazole in taming the polysulfide shuttle for long-life lithium–sulfur batteries

Wang

Cai

et al. 2016

NPG Asia Mater

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“…The anode is aligned TiO 2 nanotube (NT) arrays that are directly grown on a Ti foil. Instead of using the polyethylene (PE) separator 23 as for traditional lithium ion battery, a layer of polarized poly(vinylidene fluoride) (PVDF) film (Measurement Specialties, Inc., U.S.A.) is located above the TiO 2 nanotube arrays as the separator. This PVDF film can establish a piezoelectric potential across its thickness under externally applied stress, which not only converts mechanical energy into electricity (Figures S1 and S2, Supporting Information) but also serves as the driving force for the migration of Li ions.…”

mentioning

confidence: 99%

Hybridizing Energy Conversion and Storage in a Mechanical-to-Electrochemical Process for Self-Charging Power Cell

et al. 2012

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Energy generation and energy storage are two distinct processes that are usually accomplished using two separated units designed on the basis of different physical principles, such as piezoelectric nanogenerator and Li-ion battery; the former converts mechanical energy into electricity, and the latter stores electric energy as chemical energy. Here, we introduce a fundamental mechanism that directly hybridizes the two processes into one, in which the mechanical energy is directly converted and simultaneously stored as chemical energy without going through the intermediate step of first converting into electricity. By replacing the polyethylene (PE) separator as for conventional Li battery with a piezoelectric poly(vinylidene fluoride) (PVDF) film, the piezoelectric potential from the PVDF film as created by mechanical straining acts as a charge pump to drive Li ions to migrate from the cathode to the anode accompanying charging reactions at electrodes. This new approach can be applied to fabricating a self-charging power cell (SCPC) for sustainable driving micro/nanosystems and personal electronics. KEYWORDS: Self-charging power cell, mechanical energy, piezoelectricity, lithium ion battery, electrochemistry E nergy conversion and storage 1−3 are the two most important technologies in today's green and renewable energy science, which are usually separated units designed on the basis of vastly different approaches. As for energy harvesting, depending on the nature of energy sources, such as solar, 4−7 thermal, 8 chemical, 9 and mechanical, 10,11 various mechanisms have been developed for effectively converting them into electricity. Take smaller scale mechanical energy as an example, piezoelectric nanogenerators (NGs) have been developed into a powerful approach for converting lowfrequency, biomechanical energy into electricity. 12−14 The mechanism of the NG relies on the piezoelectric potential created by an externally applied strain in the piezoelectric material for driving the flow of electrons in the external load. 12 As for energy storage, Li-ion battery 15−20 is one of the most effective approaches, in which the electric energy is stored as chemical energy through the migration of Li ions under the driving of an externally applied voltage source and the follow up electrochemical reactions occurring at the anode and cathode. 21 In general, electricity generation and energy storage are two distinct processes that are accomplished through two different and separated physical units achieving the conversions from mechanical energy to electricity and then from electric energy to chemical energy, respectively. Here, we introduce a fundamental mechanism that directly hybridizes the two processes into one, through which the mechanical energy is directly converted and simultaneously stored as chemical energy, so that the nanogenerator and the battery are hybridized as a single unit. Such an integrated self-charging power cell (SCPC), which can be charged up by mechanical deformation and vibration from the e...

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“…However, several intrinsic factors such as low porosity, poor thermal stability, and insufficient electrolyte wettability and large difference of polarity between the highly polar liquid electrolyte and the nonpolar polyolefin separator lead to high cell resistance, low rate capability, and even internal short circuits of LIBs [28][29][30], which severely restricts the electrochemical performance of the LIBs, especially affects the safety performance of the LIBs. Therefore, the development of new separators possessing high porosity, good thermal stability, and high ionic conductivity is strongly demanded, especially in the thermal stability which seriously influences the practical application of LIBs.…”

Section: Introductionmentioning

confidence: 99%

Precipitated silica as filler for polymer electrolyte based on poly(acrylonitrile)/sulfolane

Kurc

2014

J Solid State Electrochem

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The aim of the present work was to perform a preliminary study of the physicochemical properties of hybrid organic-inorganic gel electrolytes for Li-ion batteries based on the PAN/TMS -poly(acrylonitrile)/sulfolane -polymeric matrix and surface-modified precipitated silicas. Modifications were done by means of the so-called dry method using silane U-511 3-methacryloxypropyltrimetoxysilane. Scanning electron microscopy (SEM), noninvasive back scattering method (NIBS), specific surface area (BET), the degree of modification of the silica fillers-Fourier-transform infrared spectroscopy (FT-IR), impedance analysis, and charging/ discharging were carried out. It is found that the silica fillers were homogeneously dispersed in the polymeric matrix, which enhanced conductivity and electrochemical stability of porous polymer electrolytes. Applicability of the prepared gel electrolytes for the Li-ion technology was estimated on the basis of specific conductivity measurements. It was shown that modification of the silica surface by the silane causes an increase in the gel-specific conductivity by about 2 orders of magnitude as compared to gel with unmodified silica.

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A review on the separators of liquid electrolyte Li-ion batteries

Cited by 1,435 publications

References 44 publications

The dual actions of modified polybenzimidazole in taming the polysulfide shuttle for long-life lithium–sulfur batteries

The dual actions of modified polybenzimidazole in taming the polysulfide shuttle for long-life lithium–sulfur batteries

Hybridizing Energy Conversion and Storage in a Mechanical-to-Electrochemical Process for Self-Charging Power Cell

Precipitated silica as filler for polymer electrolyte based on poly(acrylonitrile)/sulfolane

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