Chemistry of Materials
DOI: 10.1021/acs.chemmater.7b01677
Lei Jingyu
Shared posts
11 Jul 01:08
Localized Conversion of Metal–Organic Frameworks into Polymer Gels via Light-Induced Click Chemistry
by Sophia Schmitt, Stéphane Diring, Peter G. Weidler, Salma Begum, Stefan Heißler, Susumu Kitagawa, Christof Wöll, Shuhei Furukawa and Manuel Tsotsalas
16 May 01:48
Electronic Properties of Triazoles. Experimental and Computational Determination of Carbocation and Radical-Stabilizing Properties
by Xavier Creary, Kyle Chormanski, Gabriel Peirats and Carol Renneburg
The Journal of Organic Chemistry
DOI: 10.1021/acs.joc.7b00548
Baptiste Rugeri likes this
12 Jan 06:08
Enhancing cycle stability and storage property of LiNi0.8Co0.15Al0.05O2 by using fast cooling method
Publication date: 10 February 2017
Source:Electrochimica Acta, Volume 227
Author(s): Xiang Li, Wujie Ge, Hao Wang, Xinxiu Yan, Bangwei Deng, Tao Chen, Meizhen Qu
The electrochemical performance and storage properties of Ni-rich cathode materials (LiNi0.8Co0.15Al0.05O2) are improved via fast cooling methods (fast and ultrafast cooling). X-ray diffraction (XRD) results demonstrate that the interslab thickness of a fast-cooled sample is larger, and the degree of cation mixing is relatively lower, than in an untreated sample. X-ray photoelectron spectroscopy (XPS) confirms that the content of Ni3+ on the surface of a fast-cooling treated sample is lower, while the average valence state of Ni obtained via titration is higher, than in the untreated sample, indicating the existence of a surface layer with less Ni3+ for as-treated samples. Electrochemical characterizations confirm that as-treated samples display better cycling stability at 25°C and 55°C, as well as better rate capability, consistent with the XRD results. Fourier-transformed infrared spectrum (FTIR), XRD and electrochemical analysis confirm that the storage properties of fast-cooled samples are also enhanced. These results suggest that fast-cooled LiNi0.8Co0.15Al0.05O2 with less Ni3+ at the surface and larger interslab thickness in the bulk is a promising cathode material for high performance lithium ion batteries.
Source:Electrochimica Acta, Volume 227
Author(s): Xiang Li, Wujie Ge, Hao Wang, Xinxiu Yan, Bangwei Deng, Tao Chen, Meizhen Qu
The electrochemical performance and storage properties of Ni-rich cathode materials (LiNi0.8Co0.15Al0.05O2) are improved via fast cooling methods (fast and ultrafast cooling). X-ray diffraction (XRD) results demonstrate that the interslab thickness of a fast-cooled sample is larger, and the degree of cation mixing is relatively lower, than in an untreated sample. X-ray photoelectron spectroscopy (XPS) confirms that the content of Ni3+ on the surface of a fast-cooling treated sample is lower, while the average valence state of Ni obtained via titration is higher, than in the untreated sample, indicating the existence of a surface layer with less Ni3+ for as-treated samples. Electrochemical characterizations confirm that as-treated samples display better cycling stability at 25°C and 55°C, as well as better rate capability, consistent with the XRD results. Fourier-transformed infrared spectrum (FTIR), XRD and electrochemical analysis confirm that the storage properties of fast-cooled samples are also enhanced. These results suggest that fast-cooled LiNi0.8Co0.15Al0.05O2 with less Ni3+ at the surface and larger interslab thickness in the bulk is a promising cathode material for high performance lithium ion batteries.
30 Dec 02:26
Synthesis of Chiral Heterocyclic N-Haloamides and -imides and Their Applications as Halogenating Agents and Mechanistic Probes
by Ulrich Hennecke, Christian H. Müller, Constantin G. Daniliuc
N-Haloamides and -imides are standard halogenating agents and have been used in radical as well as electrophilic halogenation reactions. Despite their many applications, there are only few reports of chiral derivatives of the most common of these reagents such as N-halosuccinimides. Herein, we report the synthesis of new chiral N-halogenated amides and imide derivatives, which are easily accessible from inexpensive starting materials of the chiral pool. These new chiral halogenating agents were then applied as stoichiometric reagents in haloetherification reactions and as mechanistic probes in organocatalytic halocyclization reactions.
The syntheses of new chiral N-halogenated amide and imide derivatives have been reported. These compounds were then examined as chiral stoichiometric halogenating agents in haloetherification reactions and as mechanistic probes in enantioselective organocatalytic halocyclization reactions.
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