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An Improved Behavioral Model for high-voltage and high-power IGBT Chips

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CSEE Journal of Power and Energy Systems 2023年第1期9卷 284-292页

作者： Yixuan Yang Zhibin Zhao Cheng Peng Xuebao Li Zhiyu Sun Xiang Cui State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China

high-voltage and high-power IGBT chips have a noticeable carrier storage effect,which is related to the load current.However,the research on the carrier storage effect of existing IGBT behavior models is insufficient.In this paper,An improved behavioral model for high-voltage and high-power insulated gate bipolar transistor(IGBT)chips is proposed,which could be used under different load conditions.The problems for applying the traditional behavioral model to more load conditions are discussed.Carrier behavior,in the wide base region,is analyzed,and the analytical expression of the carrierstorage-effect equivalent capacitance and the initial value of the tail current are provided to establish an improved IGBT behavioral model.A corresponding parameter extraction method is proposed.In order to verify the improved behavioral model,an experimental platform is built for resistive load and inductive load,and the results show that the accuracy of the improved behavioral model is much better than that of the traditional model.In addition,the errors of the improved model are within 12.5%under different current and load types.Considering that the maximum error of other models,which could be applied in a variety of load conditions,is more than 25%,the accuracy of the model proposed in this paper is excellent.

关键词： Carrier storage effect High voltage IGBT behavioral model turn-off transient

Reducing structural degradation of high-voltage single-crystal Ni-rich cathode through in situ doping strategy

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Rare Metals 2023年第9期42卷 2993-3003页

作者： Xin-Ming Fan Zhi Zhang Gao-Qiang Mao Ying-Jie Tong Ke-Bo Lin Hui Tong Wei-Feng Wei Qing-Hua Tian Xue-Yi Guo Powder Metallurgy Research Institute Central South UniversityChangsha410083China School of Metallurgy and Environment Central South UniversityChangsha410083China National&Regional Joint Engineering Research Center of Nonferrous Metal Resource Recycling Changsha410083China Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha410083China College of Chemistry and Materials Engineering Hunan University of Arts and ScienceChangde415000China

Polycrystalline Ni-rich layered oxide (Li Ni_(x)Co_(y)Mn_zO_(2)(NCM),x>0.8) cathode material with high specific capacity and low cost is considered as one of the most promising candidate materials for lithium-ion batteries (LIBs).However,it suffers from severe structural and capacity degradation during practical cycling,especially under harsh operation condition(ultrahigh cutoff voltage and elevated temperature,etc.).One promising approach to mitigate these issues is to develop a single-crystal Ni-rich NCM cathode,which could enhance structural integrity and improve capacity retention,due to its robust and stable micro-sized primary particles.However,the improved cyclic stability comes at the expense of reversible capacity and rate capability,owing to the relatively low Li^(+) diffusion efficiency for its micron-sized primary particles.Moreover,the structural degradation and exacerbation of interfacial reactions for the Ni-rich NCM cathode under highvoltage (≥4.5 V) would quickly trigger the poor electrochemical performance,limiting its practical applications.Herein,Li Ni_(0.827)Co_(0.11)Zr_(0.003)Mn_(0.06)O_(2)(Zr@SC-N_(83)) cathode material was successfully synthesized via the in situ doping strategy.It could not only effectively maintain the reversibility of phase transition between H2 and H3 after long-term cycling at High voltage (4.6 V),but also enhance lithium-ion diffusion,thus improving the cycling performance and good rate performance for the Zr@SC-N_(83)cathode.As a result,0.3 wt%Zrdoping cathode delivers an initial discharging capacity of 200.1 m Ah·g^(-1)at 1.0C and at the high cutoff voltage of 4.6 V,exhibiting the satisfactory capacity retention of 85.5%after 100cycles.It provides an effective route toward low-cost and higher energy density for lithium-ion batteries with Ni-rich cathode.

关键词： Single-crystal Ni-rich LiNi_(x)Co_(y)Mn_zO_(2)(NCM) In situ doping strategy High voltage Structural integrity Cycling stability

Stable cycling of practical high-voltage LiCoO_(2)pouch cell via electrolyte modification

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Nano Research 2023年第3期16卷 3864-3871页

作者： Chao Tang Yawei Chen Zhengfeng Zhang Wenqiang Li Junhua Jian Yulin Jie Fanyang Huang Yehu Han Wanxia Li Fuping Ai Ruiguo Cao Pengfei Yan Yuhao Lu Shuhong Jiao Hefei National Laboratory for Physical Science at Microscale CAS Key Laboratory of Materials for Energy ConversionDepartment of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China Ningde Amperex Technology limited(ATL) Ningde 352100China Beijing Key Laboratory of Microstructure and Properties of Solids Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China

Nitriles as efficient electrolyte additives are widely used in high-voltage lithium-ion batteries.However,their working mechanisms are still mysterious,especially in practical high-voltage LiCoO_(2)pouch lithium-ion batteries.Herein,we adopt a tridentate ligandcontaining 1,3,6-hexanetricarbonitrile(HTCN)as an effective electrolyte additive to shed light on the mechanism of stabilizing high-voltage LiCoO_(2)cathode(4.5 V)through nitriles.The LiCoO_(2)/graphite pouch cells with the HTCN additive electrolyte possess superior cycling performance,90%retention of the initial capacity after 800 cycles at 25℃,and 72%retention after 500 cycles at 45℃,which is feasible for practical application.Such an excellent cycling performance can be attributed to the stable interface:The HTCN molecules with strong electron-donating ability participate in the construction of cathode-electrolyte interphase(CEI)through coordinating with Co ions,which suppresses the decomposition of electrolyte and improves the structural stability of LiCoO_(2)during cycling.In summary,the work recognizes a coordinating-based interphase-forming mechanism as an effective strategy to optimize the performance of High voltage LiCoO_(2)cathode with appropriate electrolyte additives for practical pouch batteries.

关键词： LiCoO_(2) High voltage nitrile additive interface adsorption pouch cell electrolyte modification

Low-temperature and high-voltage planar micro-supercapacitors based on anti-freezing hybrid gel electrolyte

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Journal of Energy Chemistry 2022年第9期31卷 195-202,I0006页

作者： Manning Chen Xiaoyu Shi Xiaolei Wang Hanqing Liu Sen Wang Caixia Meng Yu Liu Liangzhu Zhang Yuanyuan Zhu Zhong-Shuai Wu College of Chemistry and Environment Shenyang University of TechnologyShenyang 110870LiaoningChina State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023LiaoningChina

Micro-supercapacitors(MSCs)are considered as highly competitive power sources for miniaturized electronics.However,narrow voltage window and poor anti-freezing properties of MSCs in conventional aqueous electrolytes lead to low energy density and limited environmental adaption.Herein,we report the construction of low-temperature and high-energy-density MSCs based on anti-freezing hybrid gel electrolytes(HGE)through introducing ethylene glycol(EG)additives into aqueous LiCl electrolyte.Since EG partially destroys hydrogen bond network among water molecules,the HGE exhibits maximum electrochemical stability window of 2.7 V and superior anti-freezing features with a glass transition temperature of-62.8℃.Further,the optimized MSCs using activated carbon microelectrodes possess impressive volumetric capacitance of 28.9 F cm^(-3)and energy density of 10.3 mWh cm^(-3)in the voltage of 1.6 V,2.6 times higher than MSCs tested in 1.2 V.Importantly,the MSCs display 68.3%capacitance retention even at-30℃ compared to the value at 25℃,and ultra-long cyclability with 85.7%of initial capacitance after 15,000 times,indicating extraordinary low-temperature performance.Besides,our devices offer favorable flexibility and modular integration.Therefore,this work provides a general strategy of realizing flexible,safe and anti-freezing microscale power sources,holding great potential towards subzero-temperature microelectronic applications.

关键词： Hybrid gel electrolyte Micro-supercapacitors Low temperature High voltage Graphene

high-voltage LiCoO_(2) cathodes for high-energy-density lithiumion battery

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Rare Metals 2022年第12期41卷 3946-3956页

作者： Jing-Chao Zhang Zhe-Dong Liu Cui-Hua Zeng Jia-Wei Luo Yi-Da Deng Xiao-Ya Cui Ya-Nan Chen School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Beijing Frontier Research Center for Biological Structures Tsinghua UniversityBeijing 100084China Ministry of Education Key Laboratory of Protein Sciences Beijing Advanced Innovation Center for Structural BiologySchool of Life SciencesTsinghua UniversityBeijing 100084China

As the earliest commercial cathode material for lithium-ion batteries,lithium cobalt oxide(LiCoO_(2)) shows various advantages,including high theoretical capacity,excellent rate capability,compressed electrode density,etc.Until now,it still plays an important role in the lithium-ion battery market.Due to these advantages,further increasing the charging cutoff voltage of LiCoO_(2)to guarantee higher energy density is an irresistible development trend of LiCoO_(2)cathode materials in the future.However,using high charging cutoff voltage may induce a lot of negative effects,especially the rapid decay of cycle capacity.These are mainly caused by rapid destruction of crystal structure and aggravation of interface side reaction at High voltage during the cycle.Therefore,how to maintain a stable crystal structure of LiCoO_(2)to ensure the excellent long cycle performance at High voltage is a hot research issue in the further application of LiCoO_(2).In this review,we summarized the failure causes and extensive solutions of LiCoO_(2)at High voltage and promoted some new modification strategies.Moreover,the development trend of solving the failure problem of high-voltage LiCoO_(2)in the future such as defect engineering and high-temperature shock technique is also discussed.

关键词： Lithium-ion battery Lithium cobalt oxide(LiCoO_(2))cathode High voltage Cycle performance Crystal structure

high-voltage output triboelectric nanogenerator with DC/AC optimal combination method

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Nano Research 2022年第4期15卷 3239-3245页

作者： Yuqi Wang Tian Huang Qi Gao Jianping Li Jianming Wen Zhong Lin Wang Tinghai Cheng Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China School of Mechatronic Engineering Changchun University of TechnologyChangchun 130012China The Institute of Precision Machinery and Smart Structure Key Laboratory of Intelligent Operation and Maintenance Technology&Equipment for Urban Rail Transit of Zhejiang ProvinceCollege of EngineeringZhejiang Normal UniversityJinhua 321004China CUSTech Institute of Technology Wenzhou 325024China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332-0245USA

The high-voltage power source is one of the important research directions of triboelectric nanogenerator(TENG).In this paper,a high-voltage output TENG(HVO-TENG)is proposed with direct current/alternating current(DC/AC)optimal combination method for wind energy harvesting.Through the optimal design of a direct current generation unit(DCGU)and an alternating current generation unit(ACGU),the HVO-TENG can produce DC voltage of 21.5 kV and AC voltage of 200 V,simultaneously.The HVOTENG can continuously illuminate more than 6,000 light emitting diodes(LEDs),which is enough to drive more possible applications of TENG.Besides,this paper explored application experiments on HVO-TENG.Demonstrative experiments indicate that the high-voltage DC output is used for producing ozone,while the AC output can light up ultraviolet(UV)LEDs.The HVOTENG can increase the ozone concentration(C)in an airtight container to 3 parts per million(ppm)after 7 h and continuously light up UV LEDs.All these demonstrations verify that the HVO-TENG has important guiding significance for designing high performance TENG.

关键词： triboelectric nanogenerator High voltage direct current/alternating current(DC/AC)optimal combination wind energy harvesting

Boosting practical High voltage lithium metal batteries by butyronitrile in ether electrolytes via coordination, hydrolysis of C≡N and relatively mild concentration strategy

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Journal of Energy Chemistry 2022年第4期31卷 290-299页

作者： Jingrong Ning Kaijia Duan Kai Wang Jianwen Liu Shiquan Wang Jiujun Zhang College of Chemistry and Chemical Engineering&Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry&Ministry of Educational Key Laboratory for the Synthesis and Application of Organic Functional Molecules Hubei UniversityWuhanHubei 430062China Institute for Sustainable Energy/College of Science Shanghai UniversityShanghai 200444China

Currently ether solvents have been regarded as the most compatible organic solvents with lithium metal in electrolytes of lithium batteries.However,ether solvents are unstable under High voltage (>4.0 V),and prone to side reactions with nickel-rich high-voltage cathode materials.In this work,a novel dual-solvent electrolyte in ethylene glycol dimethyl ether (DME) and butyronitrile (BN) mixed solvent was designed and fabricated for Li/Li Ni_(0.5)Mn_(0.3)Co_(0.2)O_(2)-based lithium metal batteries.When charged to High voltage4.3 V,the battery cycled in this optimal electrolyte can maintain the capacity at 133.7 m Ah g^(-1) with a retention of 88.84%after 150 cycles at 0.2 C and-10℃.During long-term cycling,the battery also exhibits excellent cycling performance with capacity maintained at about 112.0 m Ah g^(-1) after 500 cycles at 1C and-10℃.BN has strong oxidation resistance and high conductivity,which can inhibit the decomposition of ether solvents under High voltage and improve the low temperature performance of battery effectively.Additionally,the cyano (–C≡N) group in BN molecular has a strong coordination ability with the high-valent metal ions and can mask the active ions on the cathode,correspondingly reducing the corrosion of cathode material by the electrolyte.Moreover,cyano group can participate in the hydrolysis to remove trace amounts of water and acidic by-products such as HF in the electrolyte.Therefore,the boosting effect of butyronitrile for ether solvents can provide a promising strategy for enhancing the performance of High voltage lithium metal batteries for practical industrialization.

关键词： Electrolytes Lithium metal batteries Ether solvents Butyronitrile High voltage

Cyanoethyl cellulose-based eutectogel electrolyte enabling high-voltage-tolerant and ion-conductive solid-state lithium metal batteries

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Carbon Energy 2022年第6期4卷 1093-1106页

作者： Hao Zhang Lixue Zhou Xiaofan Du Jianjun Zhang Songwei Tian Tingting Liu Jinning Zhang Sijia Hu Weiling Song Xinhong Zhou Guanglei Cui Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdaoShandongPR China College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdaoShandongPR China School of Chemical Engineering University of Chinese Academy of SciencesBeijingPR China

Solid-state polymer electrolytes are an important factor in the deployment of highsafety and high-energy-density solid-state lithium metal batteries.Nevertheless,use of the traditional polyethylene oxide-based solid-state polymer electrolyte is limited due to its inherently low ionic conductivity and narrow electrochemical stability window.Herein,for the first time,we specifically designed a cyanoethyl cellulosein-deep eutectic solvent composite eutectogel as a promising candidate for hybrid solid-state polymer electrolytes.It is found that the proposed eutectogel electrolyte achieves high ionic conductivity(1.87×10^(−3) S cm^(−1) at 25℃),superior electrochemical stability(up to 4.8 V),and outstanding lithium plating/striping behavior(low overpotential of 0.04 V at 1mAcm^(−2) and 1mAh cm^(−2) over 300 h).With the eutectogel-based solid-state polymer electrolyte,a 4.45 V LiCoO_(2)/Li metal battery delivers prominent long-term lifespan(capacity retention of 85%after 200 cycles)and high average Coulombic efficiency(99.5%)under ambient conditions,significantly outperforming the traditional carbonate-based liquid electrolyte.Our work demonstrates a promising strategy for designing eutectogel-based solid-state polymer electrolytes to realize high-voltage and high-energy lithium metal batteries.

关键词： cyanoethyl cellulose eutectogel High voltage solid-state lithium metal battery stable interfacial chemistry

Progress on High voltage PEO-based Polymer Solid Electrolytes in Lithium Batteries

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Chemical Research in Chinese Universities 2022年第3期38卷 735-743页

作者： HOU Wenhui OU Yu LIU Kai Department of Chemical Engineering Tsinghua UniversityBeijing100084P.R.China

Polymer electrolytes have attracted great interest for next-generation lithium-based batteries on account of safety and high energy density.In this review,we assess recent progress on the design of poly(ethylene oxide)(PEO)-based solid polymer electrolytes in High voltage lithium batteries and identify possible side reactions between PEO-based electrolytes and existing cathodes.We provide an overview of the ways to enhance High voltage resistance of PEO-based electrolytes.Those include components blend,molecular design and interface modification.With these efforts,we want to present new insights into rational design of PEO-based electrolytes to develop solid-state lithium batteries for advanced performance.

关键词： Poly(ethylene oxide) Lithium battery High voltage Molecular design Interface modification