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Recycle spent graphite to defect-engineered,high-power graphite anode

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Nano Research 2023年第4期16卷 4240-4245页

作者： Jiawei Luo Jingchao Zhang Zhaoxin Guo zhedong liu Shuming Dou Wei-Di liu Yanan Chen Wenbin Hu School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Australian Institute for Bioengineering and Nanotechnology The University of QueenslandSt LuciaQLD 4072Australia

Graphite is a dominant anode material for lithium-ion batteries(LIBs)due to its outstanding electrochemical ***,slow lithium ion(Li+)kinetics of graphite anode restricts its further ***,we report that high-temperature shock(HTS)can drive spent graphite(SG)into defect-rich recycled graphite(DRG)which is ideal for high-rate *** DRG exhibits the charging specific capacity of 323 mAh/g at a high current density of 2 C,which outperforms commercial graphite(CG,120 mAh/g).The eminent electrochemical performance of DRG can be attributed to the recovery of layered structure and partial remaining defects of SG during ultrafast heating and cooling process,which can effectively reduce total strain energy,accelerate the phase transition in thermodynamics and improve the Li+*** study provides a facile strategy to guide the re-graphitization of SG and design high performance battery electrode materials by defect engineering from the atomic level.

关键词： ultrafast recycling defect-rich graphite anode high-temperature shock

Approaching Ultimate Synthesis Reaction Rate of Ni-Rich Layered Cathodes for Lithium-Ion Batteries

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Nano-Micro Letters 2024年第10期16卷 392-402页

作者： zhedong liu Jingchao Zhang Jiawei Luo Zhaoxin Guo Haoran Jiang Zekun Li Yuhang liu Zijing Song Rui liu Wei-Di liu Wenbin Hu Yanan Chen School of Materials Science and Engineering Tianjin UniversityTianjin 300072People's Republic of China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590People's Republic of China Australian Institute of Bioengineering and Nanotechnology The University of QueenslandSt LuciaQLD 4072Australia

Nickel-rich layered oxide LiNi_(x)Co_(y)MnzO_(2)(NCM,x+y+z=1)is the most promising cathode material for high-energy lithium-ion ***,conventional synthesis methods are limited by the slow heating rate,sluggish reaction dynamics,high energy consumption,and long reaction *** overcome these chal-lenges,we first employed a high-temperature shock(HTS)strategy for fast synthesis of the NCM,and the approaching ultimate reaction rate of solid phase transition is deeply investigated for the first *** the HTS process,ultrafast average reaction rate of phase transition from Ni_(0.6)Co_(0.2)Mn_(0.2)(OH)_(2) to Li-containing oxides is 66.7(%s^(-1)),that is,taking only 1.5 *** ultrahigh heating rate leads to fast reaction kinetics,which induces the rapid phase transition of NCM *** HTS-synthesized nickel-rich layered oxides perform good cycling performances(94%for NCM523,94%for NCM622,and 80%for NCM811 after 200 cycles at 4.3 V).These findings might also assist to pave the way for preparing effectively Ni-rich layered oxides for lithium-ion batteries.

关键词： Nickel-rich layered oxides High-temperature shock Solid reaction kinetics Phase transition Reaction rate

Boosting cycling stability by regulating surface oxygen vacancies of LNMO by rapid calcination

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Nano Research 2024年第4期17卷 2671-2677页

作者： Haoran Jiang Cuihua Zeng Wei Zhu Jiawei Luo zhedong liu Jingchao Zhang Rui liu Yunhua Xu Yanan Chen Wenbin Hu School of Materials Science and Engineering Tianjin UniversityTianjin 300072China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

Spinel LiNi_(0.5-x)Mn_(1.5+x)O_(4)(LNMO)has attracted intensive interest for lithium-ion battery due to its high voltage and high energy ***,severe capacity fade attributed to unstable surface structure has hampered its *** vacancies(OVs)tend to occur in the surface of the material and lead to surface structure reconstruction,which deteriorates the battery performance during electrochemical ***,we utilize high-temperature-shock(HTS)method to synthesize LNMO materials with fewer surface *** calcination drives lower surface OVs concentration,reducing the content of Mn^(3+)and surface reconstruction layers,which is beneficial to obtain a stable crystal *** LNMO material synthesized by HTS method delivers an initial capacity of 127 mAh·g^(-1) at 0.1 C and capacity retention of 81.6%after 300 cycles at 1 C,and exhibits excellent performance at low temperature.

关键词： ultrafast synthesis oxygen vacancy LiNi_(0.5-x)Mn_(1.5+x)O_(4)(LNMO)cathode high-temperature-shock lithium-ion batteries

Ultrafastly activated needle coke as electrode material for supercapacitors

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Progress in Natural Science:Materials International 2022年第6期32卷 786-792页

作者： Cuihua Zeng Cunpeng Duan Zhaoxin Guo zhedong liu Shuming Dou Qunyao Yuan Peng liu Jingchao Zhang Jiawei Luo Weidi liu Jinfeng Zhang Yanan Chen Wenbin Hu School of Materials Science and Engineering Tianjin University Institute of Frontier and Interdisciplinary Science and Key Laboratory of Particle Physics and Particle Irradiation (MOE) Shandong University Australian Instiute for Bioengineering and Nanotechnology The University of Queensland

The uniform porous structure makes activated porous carbons(APCs) superior electrode ***,APCs are produced by a combination of time-consuming high-temperature heat treatment and activation,with a production time of up to several *** produced APCs have relatively low specific surface area(SSA) and ***,the electrochemical performance is poor,which limits its application in high-power energy storage ***,APCs materials are directly synthesized by a high temperature shock(HTS) strategy using needle coke as a *** structure of as-prepared APC is characterized by XRD,SEM and Raman,and electrochemical tests confirmed its good electrochemical *** the two-electrode system,the super-capacitor with HTS-APC as the electrode material provides a high energy density of 35 Wh kg-1and a high power density of 875 W kg-1in EMIMBF4ionic *** work is instructive for the rapid synthesis of electrode materials,and also provides guidance for the large-scale application of porous carbon materials.

关键词： Supercapacitors Activated porous carbons (APCs) High temperature shock (HTS) method Cost-effective

Analysis of precipitable water vapor change based on GNSS observations during typhoon Mangkhut event

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Analysis of precipitable water vapor change based on GNSS ob...

第十三届中国卫星导航年会

作者： zhedong liu Tengxu Zhang Junyu Li Jiao Xu Liangke Huang Lv Zhou Lilong liu College of Geomatics and Geoinformation Guilin University of Technology Guangxi Key Laboratory of Spatial Information and Geomatics College of Resources and Environmental Science and Engineering Hubei University of Science and Technology

Typhoon is a kind of natural disaster that often happens in coastal cities in summer, which endangers people’s life and property safety. Typhoons often carry a large amount of precipitable water vapor, precipitable water vapor distribution and dynamic change during the typhoon transit process is of great significance for the monitoring and forecast of typhoon. Compared with the traditional use of sounding balloon observation water vapor, PWV（Precipitable Water Vapor） retrieval using ground-based Global Navigation Satellite System（GNSS） has the advantages of high temporal and spatial resolution and near real time. Therefore, this paper inversed the PWV based on GNSS observation data in Guangxi, verified the reliability of GNSS inversion PWV by using the PWV observed by high-precision sounding station, and finally analyzed the dynamic changes of water vapor in Guangxi during the passing of Typhoon Mangkhut in combination with ERA5 reanalysis data. The results showed that:（1） GNSS-PWV has good consistency with the measured data of sounding station, which can be used to monitor the change of precipitable water vapor in extreme weather.（2） GNSS-PWV and ERA5 PWV can directly and clearly reflect the dynamic transport process of precipitable water vapor in time and space during typhoons, providing reference for predicting the movement, intensity and precipitation of typhoons.

关键词： Typhoon GNSS PWV ERA5

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检测黄曲霉毒素的方法及其应用

现代食品 2017年第22期2卷 33-34页

作者：刘哲栋徐晖福建农林大学福建福州350000

黄曲霉毒素是一种剧毒物质,会对人体造成较大的伤害。黄曲霉毒素由于一些原因出现在食品当中,引发严重的食品安全问题,进而威胁人体健康。对此,应采取简便、快速、准确的方法,对黄曲霉毒素进行检测。基于此,本文首先介绍黄曲霉毒素的常... 详细信息

黄曲霉毒素是一种剧毒物质,会对人体造成较大的伤害。黄曲霉毒素由于一些原因出现在食品当中,引发严重的食品安全问题,进而威胁人体健康。对此,应采取简便、快速、准确的方法,对黄曲霉毒素进行检测。基于此,本文首先介绍黄曲霉毒素的常用检测方法,包括化学分析法、仪器分析法、生物鉴定法、免疫分析法等。在此基础上,从食品卫生检验、肝癌诊断预防等方面,对检测黄曲霉毒素方法的应用进行分析。

关键词：黄曲霉毒素生物鉴定法化学分析法肝癌诊断预防

青海省兴海县大河坝地区铜银多金属矿成矿地质特征研究

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中国煤炭地质 2018年第12期30卷 61-66页

作者：刘瑞国刘哲东中煤地质集团有限公司北京100040

青海省大河坝地区位于东昆仑造山带和西秦岭造山带两大造山带的交汇部位,区内成矿地质条件优越。研究结果表明,工作区中部主要存在两条主干矿化构造蚀变带(Ⅰ、Ⅱ号矿化构造蚀变带)和三条次级矿化构造蚀变带(Ⅱ-1、Ⅱ-2和Ⅱ-3号矿化构... 详细信息

青海省大河坝地区位于东昆仑造山带和西秦岭造山带两大造山带的交汇部位,区内成矿地质条件优越。研究结果表明,工作区中部主要存在两条主干矿化构造蚀变带(Ⅰ、Ⅱ号矿化构造蚀变带)和三条次级矿化构造蚀变带(Ⅱ-1、Ⅱ-2和Ⅱ-3号矿化构造蚀变带)。I号矿化带中施工的ZK12见15条铜矿体、3条铅(银)矿体、1条金矿体;铜矿体累计视厚度123. 45m,Cu平均品位0. 50～1. 21×10-2。矿体分布受构造控制。空间上呈陡倾状或以透镜状雁行式产出。

关键词：大河坝铜银多金属成矿特征控矿因素青海省

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中国南部地区大气加权平均温度模型精化研究

大地测量与地球动力学 2022年第1期42卷 41-47页

作者：廖发圣黄良珂刘立龙黄玲郭希刘喆栋桂林理工大学测绘地理信息学院桂林市541006

针对中国南部地区地势西高东低、沿海与内陆存在差异等情况,分析中国南部地区T_(m)与地面温度、测站高度、季节变化以及纬度的关系,利用中国南部地区19个探空站2015~2017年的探空数据,在Bevis公式的基础上建立只考虑地面温度的线性模型(... 详细信息

针对中国南部地区地势西高东低、沿海与内陆存在差异等情况,分析中国南部地区T_(m)与地面温度、测站高度、季节变化以及纬度的关系,利用中国南部地区19个探空站2015~2017年的探空数据,在Bevis公式的基础上建立只考虑地面温度的线性模型(T_(m)-SC1模型)和与地面温度、高程、季节变化以及纬度有关的新T_(m)模型(T_(m)-SC2模型)。以2018年的探空数据为参考值,对T_(m)-SC1模型和T_(m)-SC2模型进行精度验证,并与广泛使用的Bevis公式和GPT3模型进行精度比较。结果表明,T_(m)-SC1模型的年均偏差和均方根误差(RMS)分别为0.76 K和2.57 K,相比Bevis模型和GPT3模型,其精度(RMS值)分别提高13.8%和2.2%;T_(m)-SC2模型的年均偏差和均方根误差(RMS)分别为-0.10 K和1.64 K,相比Bevis模型和GPT3模型其精度(RMS值)分别提高44.9%和37.6%。T_(m)-SC2模型用于GNSS水汽计算导致的理论RMS误差和相对误差分别为0.16 mm和0.43%。因此,T_(m)-SC2模型更适用于中国南部地区的GNSS水汽探测以及气象研究。

关键词：大气加权平均温度中国南部地区 T_(m)-SC模型 GNSS大气水汽

内蒙古东乌旗额吉淖尔一带格根敖包组中性火山岩岩石地球化学特征及成因研究

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中国煤炭地质 2019年第12期31卷 68-72,93页

作者：刘哲东刘瑞国李世龙中煤地质集团有限公司

东乌旗额吉淖尔一带格根敖包组中性火山岩研究表明,区内安山岩地球化学特征显示为一套富铝、低镁、低钾钙碱性系列岩石。岩石Si O2质量分数59.35%~61.49%,Al2O3质量分数15.79%~16.21%,MgO质量分数2.70%~3.13%。Yb质量分数0.99×10^-6~1... 详细信息

东乌旗额吉淖尔一带格根敖包组中性火山岩研究表明,区内安山岩地球化学特征显示为一套富铝、低镁、低钾钙碱性系列岩石。岩石Si O2质量分数59.35%~61.49%,Al2O3质量分数15.79%~16.21%,MgO质量分数2.70%~3.13%。Yb质量分数0.99×10^-6~1.14×10^-6,Y质量分数8.05×10^-6~8.74×10^-6,Sr质量分数97.79×10^-6~481.80×10^-6,Sr/Y值85.78~446.11,未见明显Eu异常。显示典型埃达克岩特征,主要为俯冲洋壳熔融形成,表明晚二叠世-早石炭世,调查区大地构造环境为洋壳俯冲环境。

关键词：安山岩埃达克岩岩石地球化学格根敖包组东乌旗