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1. chinaXiv:201705.00454 [pdf]

Volumetric variation confinement: surface protective structure for high cyclic stability of lithium metal electrodes

Peng, Z [Peng, Zhe][ 1 ]; Wang, SW [Wang, Shuwei][ 1 ]; Zhou, JJ [Zhou, Jingjing][ 1 ]; Jin, Y [Jin, Yan][ 1 ]; Liu, Y [Liu, Yang][ 1 ]; Qin, YP [Qin, Yinping][ 1 ]; Shen, C [Shen, Cai][ 1 ]; Han, WQ [Han, Weiqiang][ 1 ]; Wang, DY [Wang, Deyu][ 1 ]
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

A surface protective structure to efficiently improve the cyclic stability and lifetime of the lithium metal electrode is investigated. By volu- metrically confining plated lithium metal in the inter-space of a ceramic porous layer and isolating the confined lithium via a rein- forced skin-layer from attack by electrolyte solvents, the coulombic efficiency of the protected lithium metal electrode reaches very high values of $97–99%.

submitted time 2017-05-02 Hits626Downloads407 Comment 0

2. chinaXiv:201705.00417 [pdf]

Lithium-assisted exfoliation of pristine graphite for few-layer graphene nanosheets

Xu, MW [Xu, Minwei][ 1,2 ]; Sun, HT [Sun, Huiting][ 1 ]; Shen, C [Shen, Cai][ 3 ]; Yang, S [Yang, Sen][ 1 ]; Que, WX [Que, Wenxiu][ 2 ]; Zhang, Y [Zhang, Yin][ 4 ]; Song, XP [Song, Xiaoping][ 1 ]
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

A lithium-assisted approach has been developed for the exfoliation of pristine graphite, which allows the large-scale preparation of few-layer graphene nanosheets. The process involves an unexpected physical insertion and exfoliation, and the graphene nanosheets prepared by this method reveal undisturbed sp2-hybridized structures. A possible two-step mechanism, which involves the negative charge being trapped around the edges of the graphite layers and a subsequent lithiation process, is proposed to explain the insertion of lithium inside the graphite interlayers. If necessary, the present exfoliation can be repeated and thinner (single or 2–3 layer) graphene can be achieved on a large scale. This simple process provides an efficient process for the exfoliation of pristine graphite, which might promote the future applications of graphene.

submitted time 2017-05-02 Hits774Downloads478 Comment 0

3. chinaXiv:201612.00373 [pdf]

Prospect of a very long baseline neutrino oscillation experiment: HIPA to Beijing

H2B-1,VSG; Chen,H; Ding,L; He,J; Kuang,H; Lu,Y; Ma,Y; Shan,L; Shen,C; Wang,Y; Yang,C; Zhang,X; Zhu,Q; Qing,C; Xiong,Z; Yang,JM; Zhang,Z; Chen,J; Ye,Y; Lee,S

We discuss the prospects of a very long baseline neutrino oscillation experiment from HIPA to Beijing. The current understanding of neutrino oscillations, both theoretically and experimentally, are summarized. The figure of merits for interested physics m

submitted time 2016-12-28 Hits1620Downloads827 Comment 0

4. chinaXiv:201608.00132 [pdf]

Search for $XYZ$ states in $\Upsilon(1S)$ inclusive decays

Shen, C. P. and others
Subjects: Physics >> Nuclear Physics

The branching fractions of the Υ(1S) inclusive decays into final states with a J/ψ or a ψ(2S) are measured with improved precision to be $\BR(\Upsilon(1S)\to J/\psi + {\rm anything})=(5.25\pm 0.13(\mathrm{stat.})\pm 0.25(\mathrm{syst.}))\times 10^{-4}$ and $\BR(\Upsilon(1S)\to \psi(2S) + {\rm anything})=(1.23\pm 0.17(\mathrm{stat.})\pm 0.11(\mathrm{syst.}))\times 10^{-4}$. The first search for Υ(1S) decays into XYZ states that decay into a J/ψ or a ψ(2S) plus one or two charged tracks yields no significant signals for XYZ states in any of the examined decay modes, and upper limits on their production rates in Υ(1S) inclusive decays are determined.

submitted time 2016-08-25 Hits426Downloads254 Comment 0

5. chinaXiv:201608.00114 [pdf]

First observation of $\gamma \gamma \to p \barp K^+ K^-$ and search for exotic baryons in $pK$ systems

Shen, C. P. and others
Subjects: Physics >> Nuclear Physics

The process?γγ→pp?K+K??and its intermediate processes are measured for the first time using a 980~fb?1?data sample collected with the Belle detector at the KEKB asymmetric-energy?e+e??collider. The production of?pp?K+K??and a?Λ(1520)0?(Λ?(1520)0)?signal in the?pK?~(p?K+) invariant mass spectrum are clearly observed. However, no evidence for an exotic baryon near 1540~MeV/c2, denoted as?Θ(1540)0~(Θ??(1540)0) or?Θ(1540)++~(Θ(1540)??), is seen in the?pK?~(p?K+) or?pK+~(p?K?) invariant mass spectra. Cross sections for?γγ→pp?K+K?,?Λ(1520)0p?K++c.c.?and the products?$\sigma(\gamma \gamma \to \Theta(1540)^0 \bar{p} K^+ +c.c.)\BR(\Theta(1540)^0 \to p K^{-})$?and$\sigma(\gamma \gamma \to \Theta(1540)^{++} \bar{p} K^- +c.c.)\BR(\Theta(1540)^{++}\to p K^{+})$?are measured. We also determine upper limits on the products of the?χc0?and?χc2?two-photon decay widths and their branching fractions to?pp?K+K??at the 90\% credibility level.

submitted time 2016-08-24 Hits616Downloads289 Comment 0

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