Diagnostic Studies of Polyolefin Separators in High-Power Li-Ion Cells

Kostecki, Robert; Norin, Laura; Song, Xiangyun; McLarnon, Frank

doi:10.1149/1.1649233

Cited by 57 publications

(39 citation statements)

References 34 publications

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“…The peak at 1091 cm -1 corresponds to Li 2 CO 3 and the broad band at 1450 cm -1 as well as peaks that overlap with carbon D and G bands could be consistent with the symmetric vibrations of -C-O and -C=O groups of organic products of the electrolyte decomposition. Micro-Raman spectra of the anode and separator were often hampered by very strong fluorescence signal which comes form fluorophosphate compounds the decomposition of LiPF 6 to [24,25,26].…”

Section: Resultsmentioning

confidence: 99%

Studies of local degradation phenomena in composite cathodes for lithium-ion batteries

Kerlau

Marcinek

Srinivasan

et al. 2007

Electrochimica Acta

116

103

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Abstract13 C-carbon black substituted composite LiNi 0.8 Co 0.15 Al 0.05 O 2 cathodes were tested in model electrochemical cells to monitor qualitatively and quantitatively carbon additive(s) distribution changes within tested cells and establish possible links with other detrimental phenomena. Raman qualitative and semi-quantitative analysis of 13 C in the cell components was carried out to trace the possible carbon rearrangement/movement in the cell. Small amounts of cathode carbon additives were found trapped in the separator, at the surface of Li-foil anode, in the electrolyte. The structure of the carried away carbon particles was highly amorphous unlike the original 12 C graphite and 13 C carbon black additives. The role of the carbon additive, the mechanism of carbon retreat in composite cathodes and its correlation with the increase of the cathode interfacial charge-transfer impedance, which accounts for the observed cell power and capacity loss is investigated and discussed. [1,5]. Possible causes of the increase in cathode impedance and irreversible charge/discharge capacity loss include the formation of an electronic and/or ionic barrier at the cathode surface [6,7,8]. This is consistent with our earlier studies [9,10], in which we demonstrated that the non-uniform kinetic behavior of the individual oxide particles was attributed to the degradation of the electronically conducting matrix in the composite cathode upon testing. Carbon additive rearrangement in portions of the tested LiNi 0.8 Co 0.15 Al 0.05 O 2 cathodes and/or thin film formation on the surfaces of carbon and oxide particles is closely linked with the observed isolation of oxide active material.Because the composite cathodes typically consists of an active material, two types of carbon additive, and a binder, suitable instrumental techniques must be applied to obtain lateral resolution comparable to the size and morphology of electrode surface features. In situ and ex situ application of non-invasive and non-destructive microscopies and spectroscopies, including Raman, fluorescence spectroscopy, SEM, and AFM to characterize physico-chemical properties of the electrode/electrolyte interface at nanometer resolution provide unique insight into the mechanism of specific chemical

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Section: Resultsmentioning

confidence: 99%

Studies of local degradation phenomena in composite cathodes for lithium-ion batteries

Kerlau

Marcinek

Srinivasan

et al. 2007

Electrochimica Acta

116

103

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“…Electrospun fiber mats are capable of improving battery power, increasing energy density of capacitors, and fuel cell and solar cell efficiency. Poly(olefin) microporous membranes are widely used as commercial separators for Li-ion batteries, 16 and although these conventional separators have a number of suitable properties, i.e., chemical stability, tunable thickness, and mechanical strength, 17 their low porosity and poor wettability, resulting from the large polarity difference between non-polar poly(olefin) separator and highly polar liquid electrolyte, lead to increased cell resistance, limiting the performance of Li-ion batteries. 18 Electrospun fiber mats have extremely high specific areas as a result of their high porosity making them a good candidate for battery membranes.…”

Section: Electrospinning In Energy Applicationsmentioning

confidence: 99%

Electrospinning of Nanomaterials and Applications in Electronic Components and Devices

Miao

Miyauchi²,

Simmons³

et al. 2010

J. Nanosci. Nanotech.

170

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Electrospinning of nanomaterial composites are gaining increased interest in the fabrication of electronic components and devices. Performance improvement of electrospun components results from the unique properties associated with nanometer-scaled features, high specific surface areas, and light-weight designs. Electrospun nanofiber membrane-containing polymer electrolytes show improved ionic conductivity, electrochemical stability, low interfacial resistance, and improved charge-discharge performance than those prepared from conventional membranes. Batteries with non-woven electrospun separators have increased cycle life and higher rate capabilities than ones with conventional separators. Electrospun nanofibers may also be used as working electrodes in lithium-ion batteries, where they exhibit excellent rate capability, high reversible capacity, and good cycling performance. Moreover, the high surface area of electrospun activated carbon nanofibers improves supercapacitor energy density. Similarly, nanowires having quasi-one-dimensional structures prepared by electrospinning show high conductivity and have been used in ultra-sensitive chemical sensors, optoelectronics, and catalysts. Electrospun conductive polymers can also perform as flexible electrodes. Finally, the thin, porous structure of electrospun nanofibers provides for the high strain and fast response required for improved actuator performance. The current review examines recent advances in the application of electrospinning in fabricating electronic components and devices.

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“…Moreover, ceramic separators provide selective ion migration, do not show phase transitions at ambient temperatures [90,91] and cause only negligible self-discharge [92]. As the ion flow is not associated to pores, the resistance is not increased during cycle life by clogging of the pores as observed for lithium-ion cells with polyolefin separators [93]. Therefore, rechargeable batteries with ceramic separators are usually characterized by excellent storage and cycle stabilities [94][95][96].…”

Section: Definition and Propertiesmentioning

confidence: 99%

Separators - Technology review: Ceramic based separators for secondary batteries

Nestler¹,

Schmid²,

Münchgesang³

et al. 2014

AIP Conference Proceedings

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Abstract. Besides a continuous increase of the worldwide use of electricity, the electric energy storage technology market is a growing sector. At the latest since the German energy transition ("Energiewende") was announced, technological solutions for the storage of renewable energy have been intensively studied. Storage technologies in various forms are commercially available. A widespread technology is the electrochemical cell. Here the cost per kWh, e. g. determined by energy density, production process and cycle life, is of main interest. Commonly, an electrochemical cell consists of an anode and a cathode that are separated by an ion permeable or ion conductive membranethe separator -as one of the main components. Many applications use polymeric separators whose pores are filled with liquid electrolyte, providing high power densities. However, problems arise from different failure mechanisms during cell operation, which can affect the integrity and functionality of these separators. In the case of excessive heating or mechanical damage, the polymeric separators become an incalculable security risk. Furthermore, the growth of metallic dendrites between the electrodes leads to unwanted short circuits. In order to minimize these risks, temperature stable and non-flammable ceramic particles can be added, forming so-called composite separators. Full ceramic separators, in turn, are currently commercially used only for high-temperature operation systems, due to their comparably low ion conductivity at room temperature. However, as security and lifetime demands increase, these materials turn into focus also for future room temperature applications. Hence, growing research effort is being spent on the improvement of the ion conductivity of these ceramic solid electrolyte materials, acting as separator and electrolyte at the same time. Starting with a short overview of available separator technologies and the separator market, this review focuses on ceramic-based separators. Two prominent examples, the lithium-ion and sodium-sulfur battery, are described to show the current stage of development. New routes are presented as promising technologies for safe and long-life electrochemical storage cells.

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Diagnostic Studies of Polyolefin Separators in High-Power Li-Ion Cells

Cited by 57 publications

References 34 publications

Studies of local degradation phenomena in composite cathodes for lithium-ion batteries

Studies of local degradation phenomena in composite cathodes for lithium-ion batteries

Electrospinning of Nanomaterials and Applications in Electronic Components and Devices

Separators - Technology review: Ceramic based separators for secondary batteries

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