A short review on surface chemical aspects of Li batteries: A key for a good performance

Martha, Surendra K.; Markevich, Elena; Burgel, V.; Salitra, Gregory; Zinigrad, Ella; Markovsky, Boris; Sclar, Hadar; Pramovich, Z.; Heik, O.; Aurbach, Doron; Exnar, Ivan; Buqa, Hilmi; Drézen, Thierry; Semrau, G.; Schmidt, Michael A.; Kovacheva, D.; Saliyski, Nikolay

doi:10.1016/j.jpowsour.2008.09.084

Cited by 131 publications

(83 citation statements)

References 35 publications

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“…After cycling, the values of R SEI and R ct in the coated sample were found to be much smaller than those in the pristine sample, at almost 1/5 of the value. The increased surface film and charge-transfer resistances are indicative of the formation of a larger fraction of the nonconducting interfacial films as a result of enhanced side reactions with the electrolytes [12,97,98]. According to the XPS spectra of the pristine and coated cathode before and after cycling at 60°C at depths of 15, 30, and 60 nm from the surface, the spectra of the coated cathode were quite similar to -34 -those of the pristine sample before cycling.…”

Section: Resultsmentioning

confidence: 90%

Improved Rate Capability and Thermal Stability of LiNi0.5Co0.2Mn0.3O2 Cathode Materials via Nanoscale SiP2O7 Coating

Lee

Ahn

Cho

et al. 2011

J. Electrochem. Soc.

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LiδPyOz–coated LiNi0.5Co0.2Mn0.3O2 cathode materials doped with P and Si ions were prepared by direction reaction of LiOH and SiP2O7-coated Ni0.5Co0.2Mn0.3(OH)2 precursors. The coated cathodes exhibited quite impressive results; rate capability was improved by almost 100% at a 7 C rate compared to pristine LiNi0.5Co0.2Mn0.3O2. Furthermore, the amount of heat generation at 4.5 V charge cut-off as a result of the evolution of oxygen was reduced by 79%, compared to pristine LiNi0.5Co0.2Mn0.3O2 sample.

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Section: Resultsmentioning

confidence: 90%

Improved Rate Capability and Thermal Stability of LiNi0.5Co0.2Mn0.3O2 Cathode Materials via Nanoscale SiP2O7 Coating

Lee

Ahn

Cho

et al. 2011

J. Electrochem. Soc.

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“…It has also been revealed that nanostructured electrode materials with poor adherence to the current collector will agglomerate during cycling; nano-SnSb undergoes successive agglomeration during Li-ion insertion and extraction, and experiences quick capacity fade as a result [71]. Inactive LiMO y phases with transition metal cations of lower oxidation are formed from redox reactions with solution species [54]; moreover, these compounds can be spontaneously delithiated under ambient conditions involving reactions with CO 2 [72]. Thus, the application of some electro-active materials may be limited due to the high processing costs associated with avoiding these secondary reactions and stability issues.…”

Section: Shortcomings Of Nanostructured Electrodesmentioning

confidence: 99%

Microstructurally Composed Nanoparticle Assemblies as Electroactive Materials for Lithium-Ion Battery Electrodes

Uchaker

Cao

2015

Rechargeable Batteries

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Lithium-ion batteries are a well-established technology that has seen steady gains in performance based on materials chemistry as well as microstructure design and assembly over the past several decades. There are many material selections available when designing and assembling the device such as electro-active species, additives, and particle size/morphology to name a few. Many of the research proclamations focusing on the advantages of nanosized electrodes have yet to find commercial application, and considerable improvements in energy density and stability are still necessary in order to achieve energy storage parity. Therefore, the design and use of kinetically stabilized nanostructures should be considered. Over the past several years, significant studies have been conducted examining the synthesis and performance of heterogeneous structures. While heterogeneous structures typically refer to the combination of two or more materials, in this case it refers to architectures displaying more than one size scale (i.e., micro/nano). A great deal of recent efforts have focused on the formation and understanding of nanoparticle superstructures with a vast range of architectures. The design of microstructurally composed nanoparticle assemblies would, for instance, possess the

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“…(233,234) On the anode side, XPS investigations often point to the ''solid electrolyte interphase'' (SEI) and damage by Li plating; (235,236) on the cathode side, besides SEI studies, mostly the changes of the redox-partner of Li are investigated. (237,238) However, stability aspects of the electrolyte also play an important role. (237,239) Figure 26 demonstrates changes at an Li x CrMnO 4 anode material after 100 charging/discharging cycles to reduced (4.88 V) and full (5.2 V) cell voltage.…”

Section: Energy Applicationsmentioning

confidence: 99%

X‐Ray Photoelectron Spectroscopy in Analysis of SurfacesUpdate based on the original article by Steffen Oswald,Encyclopedia of Analytical Chemistry, © 2000, John Wiley & Sons, Ltd.

Oswald

2013

Encyclopedia of Analytical Chemistry

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X‐ray photoelectron spectroscopy (XPS) is an analytical technique that uses photoelectrons excited by X‐ray radiation (usually Mg Kα or Al Kα) for the characterization of surfaces to a depth of 2–5 nm. Elemental identification and information on chemical bonding are derived from the measured electron energy and energy shifts, respectively. The use of ultrahigh vacuum (UHV) during analysis requires special sample handling. Depth profiling is possible using ion sputtering. In contrast to the most popular surface analytical technique, Auger electron spectroscopy (AES), nonconducting material can be investigated, weak material damage occurs, and the chemical shifts are easier to interpret. However, the lateral resolution of the complementary AES technique (typically down to 20 nm) is much better than for XPS (50 µm for standard equipment, down to lower than 3 µm for dedicated instruments). The detection limit (of about 0.1 at%) is not as low as for mass spectroscopic techniques, but the quantification from XPS peak area measurements is more reliable, even disclaiming standard sample measurements. This article briefly discusses the principles of the technique, sample requirements, and the typical measuring strategy. Possible information sources (elements, chemical bonding, depth and lateral distributions) are described and their quantification principles are summarized. The main part deals with typical applications relating to several material classes (metals, semiconductors, insulators, and polymers) to give an impression of the capabilities of the method over a wide range of research and technological problems. A comparison with further complementary analytical techniques is given as a summary. Technological developments in electronics, nanotechnology, polymers, biotechnology, and medicine are all concerned with surface‐related phenomena, suggesting sustained interest in XPS in the foreseeable future.

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A short review on surface chemical aspects of Li batteries: A key for a good performance

Cited by 131 publications

References 35 publications

Improved Rate Capability and Thermal Stability of LiNi0.5Co0.2Mn0.3O2 Cathode Materials via Nanoscale SiP2O7 Coating

Improved Rate Capability and Thermal Stability of LiNi0.5Co0.2Mn0.3O2 Cathode Materials via Nanoscale SiP2O7 Coating

Microstructurally Composed Nanoparticle Assemblies as Electroactive Materials for Lithium-Ion Battery Electrodes

X‐Ray Photoelectron Spectroscopy in Analysis of SurfacesUpdate based on the original article by Steffen Oswald,Encyclopedia of Analytical Chemistry, © 2000, John Wiley & Sons, Ltd.

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