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Lithium ion battery

Hanyang Zhang, Zhifei Li, Wei Xu, Yicong Chen, Xiulei Ji, Michael M Lerner
There has been a major effort recently to develop new rechargeable sodium-ion electrodes. In lithium ion batteries, LiC6 forms from graphite and de-solvated Li cations during the first charge. With sodium ions, graphite only shows a significant capacity when Na+ intercalates as a solvated complex, resulting in ternary graphite intercalation compounds (GICs). Although this chemistry has been shown to be highly reversible and to support high rates in small test cells, these GICs can require >250% volume expansion and contraction during cycling...
May 22, 2018: Nanotechnology
Lixin Qiao, Zili Cui, Bingbing Chen, Gaojie Xu, Zhonghua Zhang, Jun Ma, Huiping Du, Xiaochen Liu, Suqi Huang, Kun Tang, Shanmu Dong, Xinhong Zhou, Guanglei Cui
A new salt of lithium trifluoro(perfluoro- tert -butyloxyl)borate (LiTFPFB) which possesses a bulky fluoroalkoxyl functional group in the borate anion has been synthesized for high energy lithium metal batteries. The presence of the bulky fluoroalkoxyl group in the borate anion of LiTFPFB can facilitate ion dissociation and in situ generate a protective film on the Li anode. As a result, LiTFPFB possesses a dramatically improved ionic conductivity and LiFePO4 /Li cells using 1.0 M LiTFPFB/PC electrolyte exhibit improved capacity retention especially upon cycling at elevated temperature (60 °C)...
April 14, 2018: Chemical Science
Henry A Cortes, Verónica L Vildosola, María Andrea Barral, Horacio R Corti
There is consensus on the fact that one of the main limitations of Li air batteries (LABs) is the insulating character of Li2O2 and that it becomes crucial to explore new conduction paths. Recent studies indicate that doping with chloride increases the ion conductivity of Li2O2, although to a much lesser extent than expected if chloride is assumed to be a donor dopant [Gerbig et al., Adv. Mater., 2013, 25, 3129]. Subsequently, it has been shown that the addition of lithium chloride, LiCl, to the battery electrolyte increases its discharge capacity, while this effect is not observed with other halogens [Matsuda et al...
May 18, 2018: Physical Chemistry Chemical Physics: PCCP
Shuo Yang, Dirk Oliver Schmidt, Abhishek Khetan, Felix Schrader, Simon Jakobi, Melanie Homberger, Michael Noyong, Anja Paulus, Hans Kungl, Rüdiger-Albert Eichel, Heinz Pitsch, Ulrich Simon
LiNi0.5 Mn1.5 O₄ (LNMO) spinel has been extensively investigated as one of the most promising high-voltage cathode candidates for lithium-ion batteries. The electrochemical performance of LNMO, especially its rate performance, seems to be governed by its crystallographic structure, which is strongly influenced by the preparation methods. Conventionally, LNMO materials are prepared via solid-state reactions, which typically lead to microscaled particles with only limited control over the particle size and morphology...
May 16, 2018: Materials
Jae Kook Yoon, Seunghoon Nam, Hyung Cheoul Shim, Kunwoo Park, Taeho Yoon, Hyung Sang Park, Seungmin Hyun
LTO (Li₄Ti₅O12 ) has been highlighted as anode material for next-generation lithium ion secondary batteries due to advantages such as a high rate capability, excellent cyclic performance, and safety. However, the generation of gases from undesired reactions between the electrode surface and the electrolyte has restricted the application of LTO as a negative electrode in Li-ion batteries in electric vehicles (EVs) and energy storage systems (ESS). As the generation of gases from LTO tends to be accelerated at high temperatures (40⁻60 °C), the thermal stability of LTO should be maintained during battery discharge, especially in EVs...
May 16, 2018: Materials
Tanmoy Chakrabrty, Nir Goldin, Akiva Feintuch, Lothar Houben, Michal Leskes
Dynamic nuclear polarization (DNP), a technique in which the high electron spin polarization is transferred to surrounding nuclei via microwaves irradiation, equips solid state NMR spectroscopy with unprecedented sensitivity. The most commonly used polarization agents for DNP are nitroxide radicals. However, their applicability to inorganic materials is mostly limited to surface detection. Paramagnetic metal ions were recently introduced as alternatives for nitroxides. Doping inorganic solids with paramagnetic ions can be used to tune material properties and introduces endogenous DNP agents that can potentially provide sensitivity in the particles' bulk and surface...
May 17, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Van Son Nguyen, Van Huy Mai, Pascale Auban Senzier, Claude Pasquier, Kang Wang, Marcelo J Rozenberg, Nathalie Brun, Katia March, François Jomard, John Giapintzakis, Cristian N Mihailescu, Evripides Kyriakides, Pavan Nukala, Thomas Maroutian, Guillaume Agnus, Philippe Lecoeur, Silvia Matzen, Pascal Aubert, Sylvain Franger, Raphaël Salot, Pierre-Antoine Albouy, David Alamarguy, Brahim Dkhil, Pascal Chrétien, Olivier Schneegans
Lithium cobalt oxide nanobatteries offer exciting prospects in the field of nonvolatile memories and neuromorphic circuits. However, the precise underlying resistive switching (RS) mechanism remains a matter of debate in two-terminal cells. Herein, intriguing results, obtained by secondary ion mass spectroscopy (SIMS) 3D imaging, clearly demonstrate that the RS mechanism corresponds to lithium migration toward the outside of the Lix CoO2 layer. These observations are very well correlated with the observed insulator-to-metal transition of the oxide...
May 17, 2018: Small
Jiangfeng Wang, Xing Qin, Jianling Guo, Mushang Zhou, Bo Zong, Li Wang, Guangchuan Liang
A spinel LiNi0.5Mn1.5O4 cathode material was synthesized by a urea-assisted hydrothermal method followed by high-temperature calcination with a lithium source. The effects of the molar ratio of urea to transition metal ions (U/TM ratio) on the structure, morphology and electrochemical properties of the carbonate precursor and LiNi0.5Mn1.5O4 product were systematically investigated. The as-synthesized samples were characterized by XRD, FT-IR, SEM, TEM, a constant-current charge/discharge test, CV and EIS. XRD and FT-IR results show that the LiNi0...
May 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Xianyu Liu, Ning Lin, Wenlong Cai, Yingyue Zhao, Jianbin Zhou, Jianwen Liang, Yongchun Zhu, Yitai Qian
In a simple and convenient way, mesoporous germanium nanoparticles (mp-Ge NPs) are prepared by a "metathesis" reaction of magnesium germanide (Mg2Ge) and zinc chloride (ZnCl2) in an autoclave at 300 °C. Investigated as anode materials for lithium-ion batteries, the prepared mp-Ge NPs exhibit a high capacity retention of 1048 mA h g-1 at 1 C after 1000 cycles and a high rate capacity of 727.1 mA h g-1 at 10 C in Li-Ge half cells. Additionally, a 3.4 V lithium-ion full cell (Ge-LiCoO2) with an energy retention of 85% (∼268...
May 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Yu-Cheng Liu, Nae-Lih Wu, Wei-Ren Liu
Li-rich layered cathode materials, Li1.2Ni0.4-xAlxMn0.6O2.2-y Cly (0 ≤ x ≤ 0.03 and 0 ≤ y ≤ 0.03), were successfully synthesized through coprecipitation, and the effects of Al3+-Cl- co-substitution on their surface morphology, crystal structure, surface chemistry, and electrochemical performance were characterized through XRD, SEM, XPS, TEM, and electrochemical and charge-discharge cycling. Doping the cathodes with Al3+ and Cl- ions enhanced electrochemical performance at room temperature and at a high working temperature of 55 °C...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Guozhen Zhu, Qing Li, Renchao Che
TiNb2O7 with high charge/discharge voltage (1.65 V), long life span and excellent reversibility has become a new anode material for lithium ion batteries in recent years. However, the inherent poor electronic conductivity strictly limits its practical applications. Herein, we first report a hollow TiNb2O7@C spheres with carbon spheres as sacrificial template. The special hollow structure can effectively relieve the volume expansion during the repeated process of charging/discharging. The conductivity of hollow TiNb2O7 spheres can be greatly improved by the carbon layers uniformly coated outside the surface of TiNb2O7 spheres...
May 15, 2018: Chemistry: a European Journal
Mingyang Liu, Yanjun Chen, Chaoran Qin, Zheng Zhang, Shuai Ma, Xiuru Cai, Xueqian Li, Yifeng Wang
The electrodeposition of graphene has drawn considerable attention due to its appealing applications for sensors, supercapacitors and lithium-ion batteries. However, there are still some limitations in the current electrodeposition methods for graphene. Here, we present a novel electrodeposition method for the direct deposition of reduced graphene oxide (rGO) with chitosan. In this method, a 2-hydroxypropyltrimethylammonium chloride-based chitosan-modified rGO material was prepared. This material disperses homogenously in the chitosan solution, forming a deposition solution with good dispersion stability...
2018: Beilstein Journal of Nanotechnology
Sunjin Kim, You Kyeong Jeong, Younseon Wang, Haeshin Lee, Jang Wook Choi
New binder concepts have lately demonstrated improvements in the cycle life of high-capacity silicon anodes. Those binder designs adopt adhesive functional groups to enhance affinity with silicon particles and 3D network conformation to secure electrode integrity. However, homogeneous distribution of silicon particles in the presence of a substantial volumetric content of carbonaceous components (i.e., conductive agent, graphite, etc.) is still difficult to achieve while the binder maintains its desired 3D network...
May 14, 2018: Advanced Materials
Baohua Li, Ruiying Shi, Cuiping Han, Xiaofu Xu, Xianying Qing, Lei Xu, Hongfei Li, Junqin Li, Ching-Ping Wong
Lithium ion capacitor (LIC) has been regarded as a promising device to combine the merits of lithium ion batteries and supercapacitors, which can meet the requirements for both high energy and power density. The development of advanced electrode is the key. Herein, we demonstrate the bottom-up synthesis of activated carbon nanofiber (a-PANF) with hierarchical porous structure and high graphitization degree. Electrospinning is employed to prepare interconnected fiber network with macropores and ferric acetylacetonate is introduced as both mesopore creating agent and graphitic catalyst to increase the graphitization degree...
May 14, 2018: Chemistry: a European Journal
Qiuwei Shi, Yiren Zhong, Min Wu, Hongzhi Wang, Hailiang Wang
Discovering new chemistry and materials to enable rechargeable batteries with higher capacity and energy density is of paramount importance. While Li metal is the ultimate choice of a battery anode, its low efficiency is still yet to be overcome. Many strategies have been developed to improve the reversibility and cycle life of Li metal electrodes. However, almost all of the results are limited to shallow cycling conditions (e.g., 1 mAh cm-2 ) and thus inefficient utilization (<1%). Here we achieve Li metal electrodes that can be deeply cycled at high capacities of 10 and 20 mAh cm-2 with average Coulombic efficiency >98% in a commercial LiPF6 /carbonate electrolyte...
May 14, 2018: Proceedings of the National Academy of Sciences of the United States of America
Yuan Liu, Xiaodong Yan, Bingqing Xu, Jinle Lan, Yunhua Yu, Xiaoping Yang, Yuanhua Lin, Cewen Nan
Owing to their unique structural advantages, TiO2 hierarchical nanostructures assembled by low-dimensional (LD) building blocks have been extensively used in the energy-storage/-conversion field. However, it is still a big challenge to produce such advanced structures by current synthetic techniques due to the harsh conditions needed to generate primary LD subunits. Herein, a novel one-dimensional (1D) TiO2 hierarchical porous fibrous nanostructure constructed by TiO2 nanobelts is synthesized by combining a room-temperature aqueous solution growth mechanism with the electrospinning technology...
May 14, 2018: ACS Applied Materials & Interfaces
Junyong Wang, Qinglin Deng, Mengjiao Li, Cong Wu, Kai Jiang, Zhigao Hu, Junhao Chu
To overcome inferior rate capability and cycle stability of MnO-based anode materials for lithium-ion batteries (LIBs), we reported a novel 3D porous MnO@GS/CNT composite, consisting of MnO nanoparticles homogeneously distributed on the conductive interconnected framework based on 2D graphene sheets (GS) and 1D carbon nanotubes (CNT). The distinctive architecture offers highly interpenetrated network along with efficient porous channels for fast electron transfer and ionic diffusion as well as abundant stress buffer space to accommodate the volume expansion of the MnO nanoparticles...
May 14, 2018: Nanotechnology
Jiawen Xiong, Qichang Pan, Fenghua Zheng, Xunhui Xiong, Chenghao Yang, Dongli Hu, Chunlai Huang
Highly porous carbon with large surface areas is prepared using cotton as carbon sources which derived from discard cotton balls. Subsequently, the sulfur-nitrogen co-doped carbon was obtained by heat treatment the carbon in presence of thiourea and evaluated as Lithium-ion batteries anode. Benefiting from the S, N co-doping, the obtained S, N co-doped carbon exhibits excellent electrochemical performance. As a result, the as-prepared S, N co-doped carbon can deliver a high reversible capacity of 1,101.1 mA h g-1 after 150 cycles at 0...
2018: Frontiers in Chemistry
Yan Li, Yuxia Xu, Wenping Yang, Wanxin Shen, Huaiguo Xue, Huan Pang
Over the past two decades, metal-organic frameworks (MOFs), a type of porous material, have aroused great interest as precursors or templates for the derivation of metal oxides and composites for the next generation of electrochemical energy storage applications owing to their high specific surface areas, controllable structures, and adjustable pore sizes. The electrode materials, which affect the performance in practical applications, are pivotal components of batteries and supercapacitors. Metal oxide composites derived from metal-organic frameworks possessing high reversible capacity and superior rate and cycle performance are excellent electrode materials...
May 11, 2018: Small
Simon Fleischmann, Marco Zeiger, Antje Quade, Angela Kruth, Volker Presser
Merging of supercapacitors and batteries promises the creation of electrochemical energy storage devices that combine high specific energy, power, and cycling stability. For that purpose, lithium-ion capacitors (LICs) that store energy by lithiation reactions at the negative electrode and double-layer formation at the positive electrode are currently investigated. In this study, we explore the suitability of molybdenum oxide as a negative electrode material in LICs for the first time. Molybdenum oxide/carbon nanotube hybrid materials were synthesized via atomic layer deposition and different crystal structures and morphologies were obtained by post-deposition annealing...
May 11, 2018: ACS Applied Materials & Interfaces
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