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A low-carbon strategy for revival of degraded single crystal LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)

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Rare Metals 2023年第2期42卷 459-470页

作者： Kai Yuan Rui-Qi Ning Li-Jiao zhou Chao Shen si-si zhou Jing Li Ting Jin Xiang-Gong Zhang Ke-Yu Xie State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an710072China Wuhan Institute of Marine Electric Propulsion China Shipbuilding Industry CorporationWuhan430064China Research and Development Institute of Northwestern Polytechnical University in Shenzhen Northwestern Polytechnical UniversityShenzhen518057China State Key Laboratory of Environment-Friendly Energy Materials School of Material Science and EngineeringSouthwest University of Science and TechnologyMianyang621010China

single crystal LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)is currently widely used due to the outstanding cycle stability and ***,its sensitivity to the environment and the high residual alkali makes the electrochemical performance and processing property severely degraded after long-term storage,especially for the Ni-rich single crystal ***,it is highly urgent to develop a cost-effective strategy for the revival of degraded Ni-rich cathode ***,a low-carbon strategy is proposed to revive the degraded single crystal LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(SCNCM622)through water *** solid-liquid reaction mechanism of SCNCM622 and water was revealed and the strong dependence of the recovery effect on the washing time was *** optimized conditions,the sample with a washing time of 24 h shows 31.2%reduction in viscosity,18.4%improvement in discharge capacity,15.3%enhancement in cycle life,and excellent rate performance compared to the blank ***,this strategy can achieve higher utilization of single crystal Ni-based cathode materials with a lower cost.

关键词： Li-ion battery Ni-rich cathode materials single crystal LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2) Water washing Electrochemical performance

Zr-doping stabilizes spinel LiMn_(2)O_(4)as a low cost long cycle life cathode for lithium ion batteries

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Chinese Physics B 2023年第5期32卷 554-559页

作者：张祥功吴伟周思思黄飞许诗浩尹良杨伟李泓 Wuhan Institute of Marine Electric Propulsion Wuhan 430064China Tianmu Lake Institute of Advanced Energy Storage Technologies Co. Ltd.Liyang 213300China Institute of Physics Chinese Academy of SciencesBeijing 100190China

The present commercial spinel LiMn_(2)O_(4) delivers only 90 m Ah/g–115 m Ah/g,far lower than the theoretical specific *** degrades fast caused by the Jahn–Teller effect,Mn dissolution and related side reactions that consume Li *** this work,Zr doping is employed to improve the structural stability and electrochemical performance of spinel LiMn_(2)O_(4).Li_(1.06)Mn_(1.94-x)Zr_xO_4(x=0,0.01,0.02,0.04)have been successfully synthesized by a simple solid-state reaction method and evaluated as cathode for lithium ion batteries(LIB).Li_(1.06)Mn_(1.92)Zr_(0.02)O_4 is superior cathode material with a high capacity of 122 m Ah/g at 1-C rate;long cycle stability,98.39%retention after 100 cycles at 1-C rate,excellent high rate performance 107.1 m Ah/g at 10-C rate,and high temperature performance 97.39%retention after 60 *** are thought to be related to Zr doping effectively stabilizing the spinel LiMn_(2)O_(4),by forming stronger Zr–O bonds in the octahedron,suppressing the Jahn–Teller effect,thus improving electrochemical performance.

关键词： lithium battery cathode LiMn_(2)O_(4) cycle life

Structural stability and ion migration of Li_(2)MnO_(3) cathode material under high pressures

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Chinese Physics B 2023年第12期32卷 449-453页

作者：谢泽仁周思思贺贝贝王欢文公衍生金俊张祥功汪锐 Faculty of Materials Science and Chemistry China University of GeosciencesWuhan 430074China Wuhan Institute of Marine Electric Propulsion Wuhan 430064China

Some special fields,such as deep-sea exploration,require batteries and their electrode materials to withstand extremely high *** the cathode material has the highest energy density,Li-excess Mn-based materials are also likely to be utilized in such an ***,the effect of pressure on the crystal structure and migration barrier of this kind of material is still not clear at ***,in this study,we investigate the properties of the matrix material of Li-excess Mn-based material,Li_(2)MnO_(3),under high *** equation of state,bulk modulus,and steady-state volume of Li_(2)MnO_(3) are predicted by the method of first principles *** calculations of unit cells at different pressures reveal that the cell parameters suffer anisotropic compression under high *** compression,Li-O bond is more easily compressed than Mn-O *** results from the climbing image nudged elastic band(CINEB)method show that the energy barrier of Li^(+)migration in the lithium layer increases with pressure *** study can provide useful information for utilizing Li-excess Mn-based materials under high pressure.

关键词： lithium-ion battery Li_(2)MnO_(3) high pressure DFT computation

Synchronization of Ghostburster neurons using high order sliding mode control

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Synchronization of Ghostburster neurons using high order sli...

基于UPLC/Q-TOF-MS分析附子煎煮过程中化学成分的变化

2010 Chinese Control and Decision Conference

作者： Chun-Xiao Han,Jiang Wang,Yan-Qiu Che~*,si-si zhou School of Electrical Engineering and Automation,Tianjin University,300072,P.R.China

＜正＞In this paper,high order sliding mode control is proposed to realize the synchronization of two Ghostburster neurons under external electrical *** a motion on a discontinuity set of a dynamic system,the sliding mode is used to keep accurately a given constraint and features theoretically-infinite-frequency *** the high order sliding mode technique employed in this paper,it considers a fractional power of the absolute value of the tracking error coupled with the sign *** structure provides several advantages such as the simplification of the control law,higher accuracy and chattering *** we analyze the periodic and chaotic dynamics of individual Ghostburster neuron under different external electrical stimulus,then high order sliding mode controller is designed to synchronize two Ghostburster neurons and drive the slave neuron to act as the master *** synchronization of the system can be obtained by proper choice of the control *** results demonstrate the effectiveness of the proposed control method.

关键词： Synchronization Ghostburster High order sliding mode control

来源： cnki会议评论

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中西医结合学报 2012年第8期10卷 894-900页

作者：周思思马增春梁乾德王宇光谭洪玲肖成荣张伯礼高月军事医学科学院放射与辐射医学研究所北京100850 安徽医科大学研究生学院安徽合肥230032 天津中医药大学天津300193

目的:利用超高效液相-四级杆-飞行时间串联质谱技术(ultra-performance liquid chromatography/quadrupole time-of-flight mass spectrometry,UPLC/Q-TOF-MS)分析附子随煎煮时间延长其生物碱含量的变化,从中药化学角度为附子炮制、含附子中药复方制备工艺等提供科学依据。方法:基于UPLC/Q-TOF-MS建立附子不同时间点水煎液的化学指纹图谱,通过主成分分析和偏最小二乘判别法分析附子随煎煮时间生物碱类成分的含量变化。结果:乌头碱、中乌头碱、次乌头碱等毒性较大的双酯型二萜类生物碱,在煎煮2～10min后含量较高,而苯甲酰乌头原碱、苯甲酰次乌头原碱、苯甲酰中乌头原碱等毒性较小的单酯型二萜类生物碱的含量在煎煮60min内是趋于增加的,随后其含量趋于稳定。结论:临床使用附子应根据适应证选择适宜的煎煮时间,避免煎煮不足导致中毒,或煎煮太过影响疗效。以双酯型二萜类生物碱为主要药效成分时,附子制备时间最好在30min内;以单酯型二萜类生物碱为主要药效成分时,附子制备时间最好在60min内。

关键词：附子煎煮液质联用

Path Factors and Neighborhoods of Independent Sets in Graphs

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Acta Mathematicae Applicatae sinica 2023年第2期39卷 232-238页

作者： si-zhong zhou School of Science Jiangsu University of Science and TechnologyZhenjiang 212100China

A path-factor is a spanning subgraph F of G such that every component of F is a path with at least two *** k≥2 be an integer.A P_(≥k)-factor of G means a path factor in which each component is a path with at least k vertices.A graph G is a P_(≥k)-factor covered graph if for any e∈E(G),G has a P_(≥k)-factor including ***βbe a real number with 1/3≤β≤1 and k be a positive *** verify that(ⅰ)a k-connected graph G of order n with n≥5k+2 has a P_(≥3)-factor if|NG(I)|>β(n-3k-1)+k for every independent set I of G with|I|=「β(2k+1)」;(ⅱ)a(k+1)-connected graph G of order n with n≥5k+2 is a P_(≥3)-factor covered graph if|NG(I)|>β(n-3k-1)+k+1 for every independent set I of G with|I|=「β(2k+1)」.

关键词： graph independent set neighborhood P≥3-factor P≥3-factor covered graph

A Result on Fractional(a,b,k)-critical Covered Graphs

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Acta Mathematicae Applicatae sinica 2021年第4期37卷 657-664页

作者： si-zhong zhou School of Science Jiangsu University of Science and TechnologyZhenjiang212100China

A fractional[a,b]-factor of a graph G is a function h from E(G)to[0,1]satisfying a≤d^(h)_(G)(v)≤b for every vertex v of G,where d^(h)_(G)(v)=∑e∈E(v)h(e)and E(v)={e=uv:u∈V(G)}.A graph G is called fractional[a,b]-covered if G contains a fractional[a,b]-factor h with h(e)=1 for any edge e of G.A graph G is called fractional(a,b,k)-critical covered if G—Q is fractional[a,b]-covered for any Q⊆V(G)with∣Q∣=*** this article,we demonstrate a neighborhood condition for a graph to be fractional(a,b,k)-critical ***,we claim that the result is sharp.

关键词： graph neighborhood fractional[a,6]-factor fractional[a.6]-covered graph fractional(a.b,k)-critical covered graph

Binding Numbers for Fractional ID-k-factor-critical Graphs

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Acta Mathematica sinica,English Series 2014年第1期30卷 181-186页

作者： si Zhong zhou School of Mathematics and Physics Jiangsu University of Science and Technology

LetG be a graph,and k≥2 be a positive integer.A graph G is fractional independentset-deletable k-factor-critical（in short,fractional ID-k-factor-critical）,if G I has a fractional k-factor for every independent set I of *** binding number bind（G）of a graph G is defined as bind（G）=min｜NG（X）｜｜X｜：=X V（G）,NG（X）=V（G）.In this paper,it is proved that a graph G is fractional ID-k-factor-critical if n≥6k 9 and bind（G）〉（3k 1）（n 1）kn 2k＋2.

关键词： Graph binding number independent set fractionalk-factor fractional ID-k-factor-criti-cal

Degree Conditions for k-Hamiltonian[a,b]-factors

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Acta Mathematicae Applicatae sinica 2021年第2期37卷 232-239页

作者： Jie WU si-zhong zhou School of Economic and management Jiangsu University of Science and TechnologyZhenjiang 212100China School of Science Jiangsu University of Science and TechnologyZhenjiang 212100China

Let a,b,k be nonnegative integers with 2≤a 详细信息

Let a,b,k be nonnegative integers with 2≤a

关键词： degree condition k-Hamiltonian graph k-Hamiltonian[a b]-factor