Nanostructured Tin Based Anodes For Lithium Ion Batteries With X Ray Absorption Fine Structure Studies
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Nanostructured Tin Based Anodes For Lithium Ion Batteries With X Ray Absorption Fine Structure Studies
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Author : Dongniu Wang
language : en
Publisher:
Release Date : 2013
Nanostructured Tin Based Anodes For Lithium Ion Batteries With X Ray Absorption Fine Structure Studies written by Dongniu Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
The practical applications of lithium ion batteries are highly dependent on the choice of electrodes, where boosting the materials innovations to design and achieve high capacity, excellent cycling performance, rate capability, low-cost and safe electrode materials provide the best solution. Based on this, tin-based anodes have gained great attention due to its high theoretical capacity, low cost and nontoxic nature to environment. Nevertheless, it undergoes significant volume variation(259%)during the operation of the battery, leading to pulverization and significant capacity fade. Thus, the practical application of tin-based anodes is still quite challenging. This thesis tackles issues related to tin-based anodes. It is demonstrated that designing hierarchical nanostructured tin and tin-based carbon composites particular tin-based graphene composites are the most effective routes to achieve excellent electrochemical properties. In this thesis, we reported the rational design and fabrication of nanostructured tin-based anodes which began with the synthesis of relevant electrode materials as well as evaluation of their electrochemical performance. Further, synchrotron based X-ray absorption spectroscopy was conducted to unveil the electronic structure of these composites for better understanding of the mechanism behind the performance. Various strategies of material design have been used. These include: (i) SnO2 nanowires on conducting substrates are successfully obtained using hydrothermal process. The electronic structure and the optical properties study revealed the different crystallinity and surface/defect states related luminescence. (ii) Further we extend the research to fabricate the hierarchical tin-based graphene composites such as graphene-SnO2 nanoparticles and SnO2 nanowire/graphene/carbon composites using hydrothermal method. The hierarchical nanocomposites exhibit better performance in both high and stable capacity benefitting from the buffering effect of carbonaceous materials as well as high capacity of tin dioxide. (iii) In addition, Sn@C-graphene was obtained using chemical vapor deposition method. The core-shelled Sn@C nanoparticles are well embedded in graphene matrix with superior electrochemical performances. (iv) Refer to Sn@C nanowires on metallic substrates obtained by the same route, the high cyclic capability is achieved benefitting from the one dimensional core-shell structure. (v) Most interestingly, through surface coating of Al2O3 on SnO2 electrodes via atomic layer deposition, we found that the well defined and optimized Al2O3 layer could relieve mechanical degradation and form an artificial SEI layer, leading to improved electrochemical performances compared with bare SnO2 electrodes. The element specific X-ray absorption spectra uniquely characterize the Sn, C and O specified edge of target samples, providing the information of the cystallinity and surface/defect states, revealing the strong chemical bonding and interactions between Sn or SnO2 with graphene or carbon layer, allowing for better understanding of the performance. The study in this thesis demonstrates nanostructured tin-based anodes can be alternative high performance anodes in the next generation lithium ion batteries.
Chemical Abstracts
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Author :
language : en
Publisher:
Release Date : 2002
Chemical Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Chemistry categories.
Ceramic Abstracts
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Author : American Ceramic Society
language : en
Publisher:
Release Date : 1995
Ceramic Abstracts written by American Ceramic Society and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Ceramics categories.
In Situ X Ray Absorption Spectroscopy Study Of Tin Based Graphite Composite Anodes For Lithium Ion Batteries
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Author : Yujia Ding
language : en
Publisher:
Release Date : 2019
In Situ X Ray Absorption Spectroscopy Study Of Tin Based Graphite Composite Anodes For Lithium Ion Batteries written by Yujia Ding and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
In Situ X Ray Absorption Spectroscopy Study Of Tin Anode Nanomaterials For Lithium Ion Batteries
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Author : Christopher J. Pelliccione
language : en
Publisher:
Release Date : 2015
In Situ X Ray Absorption Spectroscopy Study Of Tin Anode Nanomaterials For Lithium Ion Batteries written by Christopher J. Pelliccione and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
The History Of The Indians
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Author :
language : en
Publisher:
Release Date : 1748
The History Of The Indians written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1748 with categories.
Development Of Nanostructured Alloy Based Composite Anode Materials For Lithium And Sodium Ion Batteries
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Author : Sang Ok Kim
language : en
Publisher:
Release Date : 2016
Development Of Nanostructured Alloy Based Composite Anode Materials For Lithium And Sodium Ion Batteries written by Sang Ok Kim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Lithium-ion batteries are the dominant energy storage technology in portable electronic applications due to their high energy density, long cycle life, and low self-discharge rate. Efforts to extend their implementation into rapidly growing electric vehicles and large-scale stationary energy storage devices require further improvements of performance and safety, as well as cost reduction. In this regard, the development of low-cost, advanced electrode materials for next generation lithium-ion batteries or sodium-ion batteries is increasingly being pursued to achieve these requirements. The purpose of this dissertation is to explore and develop several types of composite alloy-based anodes that can possibly lead to the enhancement of lithium- or sodium-storage performance. Alloy anodes have shown great potential for realization of high-performance lithium- or sodium-ion battery systems with enhanced safety as they offer high theoretical specific capacity and higher operating voltages than graphite. In addition, the successful employment of earth-abundant materials such as silicon and phosphorus could also result in a reduction in battery manufacturing cost. However, the major obstacles associated with the large volume change upon electrochemical reactions give rise to severe capacity fading in the first few cycles, making their implementation into commercial cells quite challenging. In order to overcome this issue, the alloy-based composite anodes are synthesized by applying the active/inactive matrix concept. The composites are capable of possessing the following advantages: (i) structural reinforcement and suppression of particle agglomeration upon cycling through a mechanically durable buffer; (ii) enhanced electrochemical reversibility and fast electrode kinetics through nanoscale active materials; (iii) high conductivity and facile electron transport through a conducting phase; (iv) high chemical and electrochemical stability through an electrochemically inert buffer. Moreover, the composites synthesized have reasonably high tap density that is beneficial for improving the volumetric capacity of lithium- or sodium-ion cells. In this dissertation, three different low-cost alloy-based composite anodes are developed by a low-cost, facile, and scalable high-energy mechanical milling: silicon-, zinc-, and phosphorus-based composites. All the composite systems studied in this work demonstrate enhancements in lithium- or sodium-ion storage performance in terms of high capacity, long cycle life, and high rate capability, while maintaining high tap density. By controlling the type and amount of an inactive matrix, the effects of each inactive matrix on the electrochemical performance of the composite anodes are investigated. In addition, the mechanism for the performance improvement is discussed.
Nanostructured Titanium Based Oxide Anode Materials For Lithium Ion And Sodium Ion Batteries
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Author : 何正傑
language : en
Publisher:
Release Date : 2018
Nanostructured Titanium Based Oxide Anode Materials For Lithium Ion And Sodium Ion Batteries written by 何正傑 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Lithium ion batteries categories.
Tin Based Nanocomposite Alloy Anodes For Lithium Ion Batteries
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Author : Joshua Abel Leibowitz
language : en
Publisher:
Release Date : 2014
Tin Based Nanocomposite Alloy Anodes For Lithium Ion Batteries written by Joshua Abel Leibowitz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Lithium-alloying anode materials have attracted much attention as an alternative to carbon due to their high theoretical gravimetric capacities (e.g. Li4.4Si: 4200 mAh g−1, Li4.4Sn: 990 mAh g−1, and Li3Sb: 660 mAh g−1). An additional benefit of lithium alloying metals is that some of the react at a higher potentials vs. Li/Li+ than carbon, which can mitigate safety issues caused by solid-electrolyte interface layer formation and lithium plating. One of the most promising lithium -alloying anode materials that are being pursued are Sn-based materials due to their high capacity and tap density. This thesis investigates the synthesis and characterization of Sn-based lithium-ion battery anodes. SnSb-TiC-C and FeSn2-TiC nanocomposite alloy anodes for lithium-ion batteries have been synthesized by a mechanochemical process involving high-energy mechanical milling of Ti/Sn, Ti/M (M = Fe or Sb), and C. Characterization of the nanocomposites formed with x-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) reveals that these alloys are composed of crystalline nanoparticles of FeSn2 and SnSb dispersed in a matrix of TiC and carbon. The SnSb-TiC-C alloy shows an initial gravimetric capacity of 653 mAh g-1 (1384 mAh cm−3), an initial coulombic efficiency of 85%, and a tap density of 1.8 g cm−3. The FeSn2-TiC alloy shows an initial gravimetric capacity of 510 mAh g−1 (1073 mAh cm−3), an initial coulombic efficiency of 71%, and a tap density of 2.1 g cm−3. The TiC-C buffer matrix in the nanocomposite alloy anodes accommodates the large volume change occurring during the charge-discharge process and leads to good cyclability compared to pure FeSn2 and SnSb anodes.
Nanostructured Composite Anodes And Cathodes For Lithium Ion And Sodium Ion Batteries
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Author : Thrinathreddy Ramireddy
language : en
Publisher:
Release Date : 2015
Nanostructured Composite Anodes And Cathodes For Lithium Ion And Sodium Ion Batteries written by Thrinathreddy Ramireddy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Lithium ion batteries categories.
The thesis was focused on developing alloy based anode materials for Li-ion and Na-ion batteries. It helps to reduce the size and increase the energy density of the batteries. Furthermore, a novel cathode material was developed for Na-ion batteries which showed good cycling performance over a period of 100 cycles.