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Thermal stability of LiPF_6/EC+DMC+EMC electrolyte for lithium ion batteries

Rare Metals 2006年第z1期25卷 94-99页

作者： wang qingsong sun jinhua chen chunhua State Key Laboratory of Fire Science University of Science and Technology of China Hefei 230026 China State Key Laboratory of Fire Science University of Science and Technology of China Hefei 230026 China Department of Materials Science & Engineering University of Science and Technology of China Hefei 230026 China

The thermal stability of lithium-ion battery electrolyte could substantially affect the safety of lithium-ion battery. In order to disclose the thermal stability of 1.0 mol·L-1 LiPF6/ethylene carbonate (EC)+dimethyl carbonate (DMC)+ethylmethyl carbonate (EMC) electrolyte, a micro calorimeter C80 micro calorimeter was used in this paper. The electrolyte samples were heated in argon atmosphere, and the heat flow and pressure performances were detected. It is found that LiPF6 influences the thermal behavior remarkably, with more heat generation and lower onset temperature. LiPF6/EC shows an exothermic peak at 212 ℃ with a heat of reaction -355.4 J·g-1. DMC based LiPF6 solution shows two endothermic peak temperatures at 68.5 and 187 ℃ in argon filled vessel at elevated temperature. EMC based LiPF6 solution shows two endothermic peak temperatures at 191 and 258 ℃ in argon filled vessel. 1.0 mol·L-1 LiPF6/EC+DMC+ EMC electrolyte shows an endothermic and exothermic process one after the other at elevated temperature. By comparing with the thermal behavior of single solvent based LiPF6 solution, it can be speculated that LiPF6 may react with EC, DMC and EMC separately in 1.0 mol·L-1 LiPF6/EC+DMC+EMC electrolyte, but the exothermic peak is lower than that of 1.0 mol·L-1 LiPF6/EC solution. Furthermore, The 1.0 mol·L-1 LiPF6/EC+DMC+EMC electrolyte decomposition reaction order was calculated based on the pressure data, its value is n=1.83, and the pressure rate constants kp=6.49×10-2 kPa·-0.83·min-1.

关键词： lithium ion battery electrolyte thermal stability C80 micro calorimeter

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Transition-metal redox evolution and its effect on thermal stability of LiNixCoyMnzO_(2) based on synchrotron soft X-ray absorption spectroscopy

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Journal of Energy Chemistry 2021年第8期30卷 446-454,I0010页

作者： chen Liang Wenhua Zhang Zesen Wei Zhaoyu wang qingsong wang jinhua sun State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026China National Synchrontron Radiation Laboratory University of Science and Technology of ChinaHefei 230026China

Based on the synchrotron soft X-ray absorption spectroscopy experiments,the fundamental electronic structures of layered Li NixCoyMnzO_(2)(NCM)are investigated systematically and the data of transitionmetal(TM)L-and O K-edges spectra are *** of Ni ions under different oxidation states is evaluated according to linear combination *** is found that the ratio of Ni^(4+)expands with the increase of Ni since it dominates in charge compensation during charging,and that the existence of Ni^(3+)is nearly negligible in delithiated *** valence state of Co also strongly depends on Ni content,the perceptible position shift of Co L_(3)-edge absorption peak towards higher energy in Ni-rich material agrees well with the small voltage plateau at around 4.2 *** stability of Mn is verified as no obvious spectral change with the Mn L-edge is ***,as Ni content rises,the O 2p holes near the Femi level increases with higher oxidation state of Ni,indicating the enhanced hybridization of O 2p-TM 3 *** NCMs with higher Ni content are prior to lose electron existing in highly hybridized Ni3 dO 2 p bands upon heating,which accounts for the pronounced O_(2)release in phase transitions and the deterioration in thermal *** detailed observation of the electronic structure evolution is one of the key ingredients to improving the electrochemical and thermal performance of NCM.

关键词： Lithium ion battery safety Cathode material Soft X-ray absorption spectroscopy Thermal stability

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Insight into the structural evolution and thermal behavior of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) cathode under deep charge

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Journal of Energy Chemistry 2022年第2期31卷 424-432页

作者： chen Liang Lihua Jiang Zesen Wei Wenhua Zhang qingsong wang jinhua sun State Key Laboratory of Fire Science University of Science and Technology of Chin1Hefei 230026AnhuiChina National Synchrotron Radiation Laboratory University of Science and Technology of Chin1Hefei 230026AnhuiChina

By virtue of the crucial effect of the crystal structure and transition metal(TM)redox evolution on the performance of LiNi_(x)Co_(y)Mn_(z)O_(2)(NCM)cathode,systematical investigation is carried out to better understand the charge mechanism upon deep *** on the results of X-ray diffraction and highresolution transmission electron microscope,phase transformations existing on particle surface are promoted by high potential because of the deeper lithium vacancies,accompanied by more substantial structure *** X-ray absorption spectroscopy indicates that Ni acts as the major contributor to charge compensation while Co displays a remarkable redox activity over the deep charge *** elevated integrated intensity of pre-edge in O K-edge spectra reveals the extensive amount of holes formed in O 2 p orbitals and the enhanced hybridization of TM 3 d-O 2 p *** the close relationship between thermal behavior and structural evolution,the tendency of phase transitions and O_(2) release upon heating is accelerated by voltage rise,demonstrating the aggravated instability due to deeper Li *** Li contents in NCM are employed to estimate the amount of oxygen released in structural transformation and its detrimental effect on stability declares Li contentdependent ***,the extended Li vacancies,higher proportion of Ni4+and stronger orbital hybridization are considered as three factors impeding the thermal stability of the highlydelithiated NCM.

关键词： Lithium ion battery safety Overcharge Soft X-ray absorption spectroscopy Thermal property Cathode material

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Precise in-situ and ex-situ study on thermal behavior of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_(2)/graphite coin cell:From part to the whole cell

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Journal of Energy Chemistry 2021年第3期30卷 332-341页

作者： chen Liang Lihua Jiang Shuliang Ye Zhaoyu wang Zesen Wei qingsong wang jinhua sun State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026AnhuiChina Institute of Industry and Trade Measurement Technology China Jiliang UniversityHangzhou 310018ZhejiangChina

Multiple mode calorimetry and C80 micro-calorimeter are used to investigate the impact of cathode and anode on heat generation of lithium ion *** thermal behaviors of LiNi_(x)Co_(y)Mn_(z)O_(2)/graphite full cell are discussed under normal operating and elevating *** by negative entropy change,lithium intercalation presents more exotherms than deintercalation for both electrode *** contributions of irreversible and reversible heat to the total heat generation of graphite are *** phase transitions correlated with voltages and lithium contents are *** on the analysis of half-cell,the effect of two electrodes(with the same capacity)on overall heat generation is nearly the same and anode of full cell plays a key role in charging while cathode dominates in *** behaviors of lithiated graphite and delithiated LiNi_(x)Co_(y)Mn_(z)O_(2) electrolyte and their coexisting system are identified to further explore their influence on battery *** breakdown of solid electrolyte interface(SEI)at around 82℃ is considered as a crucial factor affecting the thermal stability of full *** oxidation of electrolyte induced by oxygen released from cathode material turns out to be one of the main heat *** accurate results are of great significance to improve the existing thermal management system and provide basic data for the prediction of battery performance.

关键词： Lithium ion battery safety Heat generation Micro-calorimetry Electrode materials

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Thermodynamic and Kinetic Study on Lithium Bis（Oxalato）Borate Thermal Decomposition Reaction

Thermodynamic and Kinetic Study on Lithium Bis（Oxalato）Bor...

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2011 SSITE International Conference on Future Material Research and Industry Application(FMRIA 2011)

作者： Ping Ping qingsong wang jinhua sun chunhua chen State Key Laboratory of Fire Science University of Science and Technology of China Department of Materials Science and Engineering University of Science and Technology of China

Reported accidents such as fire and explosion on account of lithium-ion batteries remind us it is important to understand the thermal stability of battery materialsLithium salt plays an important role in the safety of lithium ion batteriesThermal decomposition reaction of a lithium salt-lithium bis（oxalato）borate（Li BOB） was studied using C80 calorimeter under argon atmosphereThe samples were heated at a 0.2 K min-1 heating rate from ambient temperature to 573 K in single scanning rate experiments, or at different constant temperatures（528 K, 533 K, 538 K, 543 K） in isothermal experimentsThe results show that Li BOB decomposes near 433 K, and its decomposition reaction order was calculated to be n=1.43In addition, thermodynamic parameters and kinetic parameters were obtainedThe reaction heat associated with Li BOB decomposition process is 197.33 J g-1, the activation energy and pre-exponential factor were calculated to be E=177.23 kJ mol-1 and A=6.51×106 s-1, respectively.

关键词： lithium bis(oxalato)borate lithium ion battery thermal decomposition thermodynamic kinetics calorimeter

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CEPC Technical Design Report

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Radiation Detection Technology and Methods 2024年第1期8卷 I0003-I0016,1-1091页

作者： Waleed Abdallah Tiago Carlos Adorno de Freitas Konstantin Afanaciev Shakeel Ahmad Ijaz Ahmed Xiaocong Ai Abid Aleem Wolfgang Altmannshofer Fabio Alves Weiming An Rui An Daniele Paolo Anderle Stefan Antusch Yasuo Arai Andrej Arbuzov Abdesslam Arhrib Mustafa Ashry Sha Bai Yu Bai Yang Bai Vipul Bairathi Csaba Balazs Philip Bambade Yong Ban Tripamo Bandyopadhyay Shou-Shan Bao Desmond P.Barber Ayse Bat Varvara Batozskaya Subash Chandra Behera Alexander Belyaev Michele Bertucci Xiao-Jun Bi Yuanjie Bi Tianjian Bian Fabrizio Bianchi Thomas Biekotter Michela Biglietti Shalva Bilanishvili Deng Binglin Denis Bodrov Anton Bogomyagkov Serge Bondarenko Stewart Boogert Maarten Boonekamp Marcello Borri Angelo Bosotti Vincent Boudry Mohammed Boukidi Igor Boyko Ivanka Bozovic Giuseppe Bozzi Jean-Claude Brient Anastasiia Budzinskaya Masroor Bukhari Vladimir Bytev Giacomo Cacciapaglia Hua Cai Wenyong Cai Wujun Cai Yijian Cai Yizhou Cai Yuchen Cai Haiying Cai Huacheng Cai Lorenzo Calibbi Junsong Cang Guofu Cao Jianshe Cao Antoine Chance Xuejun Chang Yue Chang Zhe Chang Xinyuan Chang Wei Chao Auttakit Chatrabhuti Yimin Che Yuzhi Che Bin chen Danping chen Fuqing chen Fusan chen Gang chen Guoming chen Hua-Xing chen Huirun chen Jinhui chen Ji-Yuan chen Kai chen Mali chen Mingjun chen Mingshui chen Ning chen Shanhong chen Shanzhen chen Shao-Long chen Shaomin chen Shiqiang chen Tianlu chen Wei chen Xiang chen Xiaoyu chen Xin chen Xun chen Xurong chen Ye chen Ying chen Yukai chen Zelin chen Zilin chen Gang chen Boping chen Chunhui chen Hok Chuen cheng Huajie cheng Shan cheng Tongguang cheng Yunlong Chi Pietro Chimenti Wen Han Chiu Guk Cho Ming-Chung Chu Xiaotong Chu Ziliang Chu Guglielmo Coloretti Andreas Crivellin Hanhua Cui Xiaohao Cui Zhaoyuan Cui Brunella D'Anzi Ling-Yun Dai Xinchen Dai Xuwen Dai Antonio De Maria Nicola De Filippis Christophe De La Taille Francesca De Mori Chiara De Sio Elisa Del Core Shuangxue Deng Wei-Tian Deng Zhi Deng Ziyan Deng Bhupal Dev Tang Dewen Biagio Di Micco Ran Ding Siqin Dingl Yadong Ding Haiyi Dong Jianin AGH University of Science and Technology Faculty of Physics and Applied Computer ScienceKrakow Anhui University HefeiAnhui Applied Physics Department Federal Urdu University of ArtsScience and TechnologyIslamabad Banaras Hindu University Institute of ScienceVaranasi Bandirma Onyedi Eylul University Bandirma Beihang University Beijing Beijing Computational Science Research Center Beijing Beijing Conveyi LTD Beijing Beijing Glass Research Institute Co. LtdBeijing Beijing Institute of Technology Beijing Beijing Normal University Beijing Brown University ProvidenceRI Budker Institute of Nuclear Physics Novosibirsk Cadi Ayyad University Laboratory of Fundamental and Applied PhysicsPolydisciplinary FacultyMarrakech Cairo University Giza Center for Theory and Computation National Tsing Hua UniversityHsinchu Central China Normal University WuhanHubei Central South University ChangshaHunan Centro de Fisica Teorica de Particulas Universidade Tecnica de LisboaLisboa chengdu KaitengSifang Digital Radio&TV Equipment Co. LtdChengduSichuan China academy of engineering physics MianyangSichuan China building materials academy Beijing China Center of Advanced Science and Technology Beijing China Institute of Atomic Energy Beijing China Jiliang University HangzhouZhejiang China Nuclear Instrument CO. LTDBeijing China University of Geosciences Beijing China University of Geosciences WuhanHubei China University of Mining and Technology XuzhouJiangsu China West Normal University NanchongSichuan Chongqing University Department of PhysicsChongqing Chulalongkorn University Bangkok City University of Hong Kong Department of PhysicsHong Kong Cockcroft Institute Daresbury Cornell University IthacaNY CPPM(AMU/IPhU&CNRS/INP) Marseille Dalian Minzu University DalianLiaoning Dalian University of Technology Department of PhysicsDalian Deutsches Elektronen-Synchrotron DESY Hamburg Dzhelepov Laboratory of Nuclear Problems of Joint Institute for Nuclear Research(DLNP JINR) Dubna East China University Of Science And Technol

The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by China,fostered through extensive collaboration with international *** complex comprises four accelerators:a 30 GeV Linac,a 1.1 GeV Damping Ring,a Booster capable of achieving energies up to 180 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The Linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 100 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs *** its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×10^(34)cm^(-2)s^(-1)per interaction point(IP),resulting in an integrated luminosity of 13 ab^(-1)for two IPs over a decade,producing 2.6 million Higgs *** the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of *** Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,2015)and the Conceptual Design Report(CDR,2018),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil engineering ***,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming engineering design phase and site selection *** is anticipated to begin around 2027-2028,pending government approval,with an estimated duration of 8 *** commencement of experiments and data collection could potentially be initiated in the mid-2030s.

关键词： initiated exceeding precise

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Fault Tree Analysis and Countermeasures for Lithium-ion Battery Explosion

Fault Tree Analysis and Countermeasures for Lithium-ion Batt...

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2004安全科学与技术国际会议

作者： wang qingsong sun jinhua & chen Sining (State Key Laboratory of Fire Science University of Science and Technology of China Hefei 230026 Anhui China)

With the popular application of lithium-ion batteries, many batteries explosion accident were reported. In order to analyse the causes of explosion and set down corresponding countermeasure, start wit

关键词： lithium-ion battery fault tree analysis explosion countermeasure

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多源重气泄漏扩散模拟研究

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中国科学技术大学学报 2014年第8期44卷 697-703页

作者：朱红亚陈昊东王青松孙金华中国科学技术大学火灾科学国家重点实验室安徽合肥230026 公安部天津消防研究所天津300381

由于重气效应的存在,重气的泄漏和扩散的危险性较之轻气更为严重.在单源SLAB模型的基础上发展了多源重气扩散模型,并对单源和多源重气在连续泄漏和瞬时泄漏两种泄漏模式下的扩散都进行了模拟研究.以氯气泄漏为研究算例,计算得到了相应... 详细信息

由于重气效应的存在,重气的泄漏和扩散的危险性较之轻气更为严重.在单源SLAB模型的基础上发展了多源重气扩散模型,并对单源和多源重气在连续泄漏和瞬时泄漏两种泄漏模式下的扩散都进行了模拟研究.以氯气泄漏为研究算例,计算得到了相应条件下下风向的时均浓度分布情况,结合毒性标准给出了不同毒性水平下的事故后果影响范围,从而可以为应急救援和疏散决策制定提供理论指导.

关键词：重气扩散 SLAB模型多源连续泄漏瞬时泄漏

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液化石油气泄漏的危险性分析及其事故后果评价方法

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中国工程科学 2005年第9期7卷 61-64,69页

作者：陈思凝孙金华王青松中国科学技术大学火灾科学国家重点实验室合肥230026

液化石油气(LPG)在其运输和存储过程中存在着各种与火灾和爆炸相关的危险性。由于LPG的泄漏可能导致包括闪火,不可控蒸气云爆炸,沸腾液体膨胀蒸汽爆炸等一系列灾害的发生,针对上述的各种灾害的具体发生条件及其危险性进行了分析;在事故... 详细信息

液化石油气(LPG)在其运输和存储过程中存在着各种与火灾和爆炸相关的危险性。由于LPG的泄漏可能导致包括闪火,不可控蒸气云爆炸,沸腾液体膨胀蒸汽爆炸等一系列灾害的发生,针对上述的各种灾害的具体发生条件及其危险性进行了分析;在事故后果评价中采用量化风险分析,提出了沸腾液体膨胀蒸汽爆炸和不可控蒸气云爆炸对周围人员可能造成伤害的评价方法。

关键词：液化石油气泄漏火灾危险性分析后果评价

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