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Self-actuating protection mechanisms for safer lithium-ion batteries

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Journal of Energy Chemistry 2024年第7期94卷 181-198页

作者： Yang Luo Chunchun Sang Kehan Le Hao Chen Hui Li xinping ai Hubei Key Lab of Electrochemical Power Sources College of Chemistry&Molecular ScienceWuhan UniversityWuhan 430072HubeiChina state Key Laboratory of New Textile Materials&Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200HubeiChina

Safety issue is still a problem nowadays for the large-scale application of lithium-ion batteries(LIBs)in electric vehicles and energy storage *** unsafe behaviors of LIBs arise from the thermal run-away,which is intrinsically triggered by the overcharging and *** improve the safety of LIBs,various protection strategies based on self-actuating reaction control mechanisms(SRCMs)have been proposed,including redox shuttle,polymerizable monomer additive,potential-sensitive separator,thermal shutdown separator,positive-temperature-coefficient electrode,thermally polymerizable addi-tive,and reversible thermal phase transition *** build-in protection mechanisms,these meth-ods can sensitively detect either the temperature change inside battery or the potential change of the electrode,and spontaneously shut down the electrode reaction at risky conditions,thus preventing the battery from going into thermal *** their advantages in enhancing the intrinsic safety of LIBs,this paper overviews the research progresses of SRCMs after a brief introduction of thermal runaway mechanism and limitations of conventional thermal runaway mitigating *** importantly,the current states and issues,key challenges,and future developing trends of SRCTs are also discussed and outlined from the viewpoint of practical application,aiming at providing insights and guidance for developing more effective SRCMs for LIBs.

关键词： Li-ion battery Safety Thermal runaway Thermal protection Overcharge protection

A polyethylene microsphere-coated separator with rapid thermal shutdown function for lithium-ion batteries

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Journal of Energy Chemistry 2020年第5期29卷 33-40页

作者： Chongrong Zhang Hui Li Shixuan Wang Yuliang Cao Hanxi Yang xinping ai Faping Zhong Hubei Key Lab of Electrochemical Power Sources College of Chemistry&Molecular ScienceWuhan UniversityWuhan 430072HubeiChina National Engineering Research Center of Advanced Energy Storage Materials Changsha 410205HunanChina

Thermal runaway is the main factor contributing to the unsafe behaviors of lithium-ion batteries(LIBs)in practical *** application of separators for the thermal shutdown has been proven as an effective approach to protecting LIBs from thermal *** this work,we developed a thermal shutdown separator by coating a thin layer of low-density polyethylene microspheres(PM)onto a commercial porous polypropylene(PP)membrane and investigated the thermal response behaviors of the as-prepared PM/PP separator in *** structural and thermal analysis results revealed that the coated PM layer had a porous structure,which facilitated the occurrence of normal charge-discharge reactions at ambient temperature,although it could melt completely and fuse together within very short time periods:3 s at 110℃and 1 s at 120℃,to block off the pores of the PP substrate,thereby cutting off the ion transportation between the electrodes and interrupting the battery ***,the PM/PP separator exhibits very similar electrochemical performance to that of a conventional separator at ambient ***,it performs a rapid thermal shutdown at an elevated temperature of^110℃,thus controlling the temperature rise and maintaining the cell in a safe *** to its synthetic simplicity and low cost,this separator shows promise for possible application in building safe LIBs.

关键词： Thermal shutdown Separator Safety Lithium-ion battery

Surface-engineering enhanced sodium storage performance of Na_3V_2(PO_4)_3 cathode via in-situ self-decorated conducting polymer route

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Science China Chemistry 2017年第12期60卷 1546-1553页

作者： Jiexin Zhang Tianci Yuan Haiying Wan Jiangfeng Qian xinping ai Hanxi Yang Yuliang Cao Hubei Key Laboratory of Electrochemical Power Sources College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China Jincheng Abound Energy Ltd. Jincheng 048000 China

The key to the development of sodium ion battery is materials with a high rate capacity and cycle stability. Conducting coating is an efficient approach to improve electrochemical performance. As a case study, the Na_3V_2(PO_4)_3@PEDOT composite was prepared through an in-situ self-decorated conducting polymer route without further calcination. The Na_3V_2(PO_4)_3 electrode with a 7%poly(3,4-ethylenedioxythiophene)(PEDOT) coating can deliver an initial reversible capacity of 100 mA h g^(-1) at 1 cycle, and 82%capacity retention over 200 cycles. The results also show that the Na_3V_2(PO_4)_3 electrode without and with a thick PEDOT coating exhibits poor electrochemical performance, indicating that an appropriate coating layer is important for improving electronic conductivity and regulating Na-ion insertion. Therefore, this work offers possibility to promote the electrochemical performance of poor-conducting materials in sodium-ion batteries using an in-situ self-decorated conducting polymer.

关键词： PEDOT Na3V2(PO4)3 surface coating cathode sodium ion batteries

Enhanced cycling stability of antimony anode by downsizing particle and combining carbon nanotube for high-performance sodium-ion batteries

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Journal of Materials Science & Technology 2020年第20期52卷 81-88页

作者： Chuang Liu Fanxin Zeng Li Xu Shuangyu Liu Jincheng Liu xinping ai Hanxi Yang Yuliang Cao College of Chemistry and Molecular Sciences Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and EnergyWuhan UniversityWuhan 430072China State Key Laboratory of Advanced Transmission Technology Global Energy Interconnection Research Institute Co.Ltd.Beijing 102211China EVE Energy Co.ltd. No.36Huifeng 7th RoadZhongkai Hi-Tech ZoneHuizhouChina

Antimony(Sb)nanoparticles(SbNP)encapsulated in multiwalled carbon nanotubes(MWCNTs)matrix has been fabricated by a facile two-step ball milling strategy,including a sand milling process to prepare Sb nanoparticles and following high-energy ball milling to synthesize SbNP-MWCNT *** an anode material for sodium-ion batteries(SIBs),the SbNP-MWCNT composite with high Sb content(80%)can deliver a reversible capacity of 471.1 mA hg^(-1)at 50 mA g^(-1)with an initial coulombic efficiency of 73.5%,excellent cycling stability(94.1%capacity retention at 800 mA g^(-1))and high rate capability(210.7 mA h g^(-1)at 3200 mA g^(-1)).The excellent electrochemical performance of the SbNP-MWCNT composite results from the synergistic effect of downsizing Sb particles and combining MWCNTs.

关键词： Antimony Nanoparticles Carbon nanotubes Anode Sodium ion battery Mechanical ball milling

A high-loading and cycle-stable solid-phase conversion sulfur cathode using edible fungus slag-derived microporous carbon as sulfur host

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Nano Research 2023年第6期16卷 8360-8367页

作者： Hui Li Xiangjiang Wu Sijie Jiang Qian Zhang Yuliang Cao Hanxi Yang Feifei Cao xinping ai Hubei Key Laboratory of Electrochemical Power Sources College of Chemistry&Molecular ScienceWuhan UniversityWuhan 430072China College of Science Huazhong Agricultural UniversityWuhan 430070China

Developing a high sulfur(S)-loading cathode with high capacity utilization and long term cyclability is a key challenge for commercial implementation of Li-S battery *** overcome this challenge,we propose a solid-phase conversion sulfur cathode by using an edible fungus slag-derived porous carbon(CFS)as sulfur host to fabricate the S/CFS composite and meanwhile,utilizing the vinyl carbonate(VC)as co-solvent of the ether-based electrolyte to in-situ form a protective layer on the S/CFS composite surface through its nucleophilic reaction with the freshly generated lithium polysulfides(LiPSs)at the very beginning of initial discharge,thus isolating the interior sulfur from the outer electrolyte and inhibiting the further generation of soluble *** from the ultrahigh specific surface area of>3,000 m^(2)·g^(−1),ideal pore size of2.0 cm^(3)·g^(−1)of the CFS host matrix,the S/CFS cathode even with a high S-loading of 80 wt.%(based on the weight of S/CFS composite)can still operate in a solid-phase conversion manner in the VC-ether co-solvent electrolyte to exhibit a high reversible capacity of 1,557 mAh·g^(−1),a high rate capability with 50%remaining capacity at 2 A·g^(−1)and a high cycling efficiency of 99.9%over 500 *** results presented in this work suggest that a combined action of solid-phase conversion electrochemistry and nanoarchitectured host structure may provide a new path for the design and development of practical lithium-sulfur batteries.

关键词： lithium-sulfur batteries solid-phase conversion high sulfur loading cathode edible fungus slag-derived carbon nucleophilic reaction

Understanding of the sodium storage mechanism in hard carbon anodes

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Carbon Energy 2022年第6期4卷 1133-1150页

作者： Xiaoyang Chen Changyu Liu Yongjin Fang xinping ai Faping Zhong Hanxi Yang Yuliang Cao Hubei Key Laboratory of Electrochemical Power Sources College of Chemistry and Molecular SciencesWuhan UniversityWuhanChina Shenzhen National Engineering Research Center of Advanced Energy Storage Materials ShenzhenChina

Hard carbon has been regarded as the most promising anode material for sodiumion batteries(SIBs)due to its low cost,high reversible capacity,and low working ***,the uncertain sodium storage mechanism hinders the rational design and synthesis of high-performance hard carbon anode materials for practical *** the past decades,tremendous efforts have been put to stimulate the development of hard carbon *** this review,we discuss the recent progress of the study on the sodium storage mechanism of hard carbon anodes,and the effective strategies to improve their sodium storage performance have been *** is anticipated that hard carbon anodes with high electrochemical properties will be inspired and fabricated for large-scale energy storage applications.

关键词： anode electrochemical energy storage hard carbon sodium-ion batteries sodium storage mechanism

High performance TiP_2O_7 nanoporous microsphere as anode material for aqueous lithium-ion batteries

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Science China Chemistry 2019年第1期62卷 118-125页

作者： Yunping Wen Yao Liu Duan Bin Zhuo Wang Congxiao Wang Yuliang Cao xinping ai Yongyao Xia Collaborative Innovation Center of Chemistry for Energy Materials Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Institute of New Energy Fudan University Hubei Key Laboratory Electrochem Power Sources College of Chemistry and Molecular Science Wuhan University

This work developed a facile way to mass-produce a carbon-coated TiP_2O_7 nanoporous microsphere(TPO-NMS) as anode material for aqueous lithium-ion batteries via solid-phase synthesis combined with spray drying method. TiP_2O_7 shows great prospect as anode for aqueous rechargeable lithium-ion batteries(ALIBs) in view of its appropriate intercalation potential of-0.6 V(vs. SCE) before hydrogen evolution in aqueous electrolytes. The resulting sample presents the morphology of secondary microspheres(ca. 20 μm) aggregated by carbon-coated primary nanoparticles(100 nm), in which the primary nanoparticles with uniform carbon coating and sophisticated pore structure greatly improve its electrochemical performance. Consequently, TPONMS delivers a reversible capacity of 90 mA h/g at 0.1 A/g, and displays enhanced rate performance and good cycling stability with capacity retention of 90% after 500 cycles at 0.2 A/g. A full cell containing TPO-NMS anode and LiMn_2O_4 cathode delivers a specific energy density of 63 W h/kg calculated on the total mass of anode and cathode. It also shows good rate capacity with56% capacity maintained at 10 A/g rate(vs. 0.1 A/g), as well as long cycle life with the capacity retention of 82% after 1000 cycles at 0.5 A/g.

关键词： aqueous lithium-ion batteries H2 evolution reaction anode TiP2O7 spray drying

Investigation of Ru(phen)_3^(2+)-Hydrazine-Ce(Ⅳ) Chemiluminescence System and Its Analytical Application

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Wuhan University Journal of Natural Sciences 2006年第3期11卷 672-676页

作者： SHI Bo＇an ZENG Danyun JI Xinghu XI Juan ai xinping HE Zhike College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 Hubei China Department of Chemistry and Chemical Engineering Huhei Institute for Nationalities Enshi 445000 HubeiChina

It was observed that hydrazine could enhance the chemiluminescence （CL） intensity of tris-（1,10 phenanthroline）ruthenium（Ⅱ）（Ru（ phen）3^2＋）- Cerium（ Ⅳ ） ice（ Ⅳ ）） system, based on which, a novel CL system, Ru（phen）3^2＋ Hydrazine-Ce（Ⅳ）, was established. This CL system was investigated and employed to detect hydrazine. Under the optimum experimental conditions, the linear range and detection limit of the proposed method are 2.0× 10^-6-2.0×10^-3g·L^-1 and 1. 8×10^-6g·L^-1, respectively. For 1. 5 × 10^-5, 1.5×10^-4 and 1.2×10^-3 g·L^-1 hydrazine, the relative standard deviation （RSD） is 2.9%, 2.2% and 3. 1%, respectively （n= 11）. The proposed method has been used to detect the content of hydrazine in the synthetic samples with satisfactory results.

关键词： tris-( 1, 10-phenanthroline) ruthenium ( Ⅱ ) chemiluminescene hydrazine

One Step Ball-Milling Synthesis of LiFePO_ 4 Nanoparticles as the Cathode Material of Li-Ion Batteries

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Wuhan University Journal of Natural Sciences 2006年第3期11卷 687-690页

作者： ai xinping LI Hai LI Xiaoyan LIAO Qinli LIU Bingdong YANG Hanxi College of Chemistry and Molecular Science Wuhan University Wuhan 430072 China Fenghua Lithium Battery Co. Ltd. Zhaoqing 526040 Guangdong China

A one-step synthetic method was used to synthesize Olivline LiFePO4 powders by direct ball milling the stoichiometric mixture of Fe, Li3PO4 , and FePO4 powders. XRD and TEM measurements revealed that the as-prepared LiFePO4 powder have a homogeneous Olivine structure and a uniform size distribution of ca. 50 nm. Based on this material, a LiFePO4/C composite was prepared and used for the cathode material of Li-ion batteries. The charge-discharge experiments demonstrated that the LiFePO4/C composite material has a high capacity of 132 mAh/g at 0.1 C and a quite highrate capability of 95 mAh/g at 1 C. This new ball-milling method may provide a completely green synthetic route for preparing the materials of this type cost-effectively and in large volume.

关键词： LiFePO4 cathode material ball millings onestep synthesis green synthesis