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Review of Thermal Design of SiC Power Module for Motor Drive in electrical Vehicle Application

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CES Transactions on electrical Machines and Systems 2024年第3期8卷 332-346页

作者： Puqi Ning Xiaoshuang Hui Dongrun Li Yuhui Kang Jiajun Yang Chaohui Liu Key Laboratory of High Density Electromagnetic Power and Systems(Chinese Academy of Sciences) Institute of Electrical EngineeringChinese Academy of SciencesBeijing 100190China school of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100190China National New Energy Vehicle Technology innovation center Beijing 100176China

In the current vehicle electric propulsion systems,the thermal design of power modules heavily relies on empirical knowledge,making it challenging to effectively optimize irregularly arranged Pinfin structures,thereby limiting their *** paper aims to review the underlying mechanisms of how irregularly arranged Pinfins influence the thermal characteristics of power modules and introduce collaborative thermal design with DC bus capacitor and *** considers chip size,placement,coolant flow direction with the goal of reducing thermal resistance of power modules,minimizing chip junction temperature differentials,and optimizing Pinfin *** the first step,algorithms should efficiently generating numerous unique irregular Pinfin layouts to enhance optimization *** second step is to efficiently evaluate Pinfin *** accuracy and speed should be ensured to improve computational ***,to improve overall heat dissipation effectiveness,papers establish models for capacitors,motors,to aid collaborative Pinfin *** research outcomes will provide essential support for future developments in high power density motor drive for vehicles.

关键词： Thermal design Power module Pinfin Motor drive

A gradient solid electrolyte interphase with high Li+conductivity induced by bisfluoroacetamide additive for stable lithium metal batteries

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Nano Research 2023年第6期16卷 8425-8432页

作者： Zhaoyang Sun Ziyue Wen Yi Chen Yue Ma Jinxiang Zhang Yuejiao Li Li Li Renjie Chen Beijing Key Laboratory of Environmental Science and Engineering School of Material Science&EngineeringBeijing Institute of TechnologyBeijing 100081China Institute of Advanced Technology Beijing Institute of TechnologyJinan 250300China collaborative innovation center of electric vehicles in Beijing Beijing 100081China

Stable Li metal anodes have become the driving factor for high-energy-density battery ***,uncontrolled growth of Li dendrite hinders the application of rechargeable Li metal batteries(LMBs).Here,a multifunctional electrolyte additive bisfluoroacetamide(BFA)was proposed to facilitate high-performance *** uniform and dense deposition of Li^(+) was achieved due to the reduced nucleation and plateau overpotential by the addition of ***,X-ray photoelectron spectroscopy(XPS)tests reveal a gradient solid electrolyte interface(SEI)structure on the Li metal *** voltammetry(CV)curves at different sweep speeds prove the formation of pseudocapacitance at the electrode-electrolyte interface,which accelerates the Li+transport rate and protects the electrode *** low activation energy also indicates the ability of rapid Li^(+) transportation in electrolyte ***,the Li||Li symmetric cells with 1.0 wt.%BFA electrolyte exhibit good cycling performance at 0.5 mA·cm^(−2)for over 2000 h,and Li||LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM622)full cells maintain a high capacity for 200 cycles at 1 C rate.

关键词： electrolytes additives solid electrolyte interphase Li dendrites Li metal batteries

High-Voltage Layered Ternary Oxide Cathode Materials:Failure Mechanisms and Modification Methods

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Chinese Journal of Chemistry 2020年第12期38卷 1847-1869页

作者： Xiaodan Wang Ying Bai Xinran Wang Chuan Wu Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science&EngineeringBeijing Institute of TechnologyNo.5 South Zhongguancun StreetBeijing 100081China collaborative innovation center of electric vehicles in Beijing Beijing 100081China

Due to the large reversible capacity,high operating voltage and low cost,layered ternaryoxide cathode materials LiNixCoyAl-x-yO2(NCA)and LiNixCoyMn1-x-yO2(NCM)are considered asthe most potential candidate materials for lithium-ion batteries(LIBs)used in(hybrid)electricvehicles(EVs).However,next-generation long-range EVs require a high specific capacity(around 203 mAh·g^-1at 3.7V)at the cathode active material level,which is not provided withcurrent commercially layered ternary oxide *** the operating voltage is aneffective method to improve the specific capacity of the cathode and the energy density of the battery,but the high operating voltage also causes a lot of problems,such as cation mix-ing and phase transformation,electrolyte decomposition,transition metal dissolution *** far,researchers have carried out a lot of works to solve these ***,element doping and the design of electrolytes have been proved to be effective *** this review,the failure mechanisms and modification methods of high-voltage lay-ered ternary oxide cathode materials are summarized,which could provide valuable infor-mation to the research of high-voltage layered ternary oxide cathode materials in basic sci-ence and industrial production.

关键词： coating Ternary battery

Use of rare earth elements in single-atom site catalysis:A critical review——Commemorating the 100th anniversary of the birth of Academician Guangxian Xu

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Journal of Rare Earths 2021年第3期39卷 233-242,I0001页

作者： Ningqiang Zhang Han Yan Lingcong Li Rui Wu Liyun Song Guizhen Zhang Wenjun Liang Hong He Key Laboratory of Beijing on Regional Air Pollution Control and Beijing Key Laboratory for Green Catalysis and Separation Beijing University of TechnologyBeijing 100124China Department of Chemistry Tsinghua UniversityBeijing 100084China collaborative innovation center of electric vehicles in Beijing Beijing 100081China

Rare earth metals are strategic resources with potential applications in optics,metallurgy and *** recent years,single-atom site catalysts(SASCs) have attracted increasing attention owing to their 100%atom efficiency and unique catalytic *** the past decade,rare earth elements,including rare earth metals and their oxides,have shown great potential in ***,systematic analyses of data are still *** this mini-review,the use of rare earth metals and their oxides in SASCs was summarized and the results are discussed.A particular focus was paid to the synthetic strategies,characterization of rare earth-containing SASCs,and applications as catalysis supports,promoters and active *** issues faced by rare-earth metals and their oxides in SASCs,as well as future prospects were also provided.

关键词： Rare earth catalysis Single-atom site catalysis Synthetic strategies Characterization Applications

Overcharge-to-thermal-runaway behavior and safety assessment of commercial lithium-ion cells with different cathode materials:A comparison study

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Journal of Energy Chemistry 2021年第4期30卷 484-498页

作者： Zhenpo Wang Jing Yuan Xiaoqing Zhu Hsin Wang Lvwei Huang Yituo Wang Shiqi Xu National Engineering Laboratory for electric vehicles Beijing Institute of TechnologyBeijing 100081China collaborative innovation center for electric vehicles in Beijing Beijing 100081China Materials Science and Technology Division Oak Ridge National LaboratoryOak Ridge 37831TNUSA Shanghai Jieneng Automotive Technology Co. Ltd.Shanghai 201804China State-assigned electric Vehicle Power Battery Testing center China North Vehicle Research InstituteBeijing 100072China

In this paper,overcharge behaviors and thermal runaway(TR)features of large format lithium-ion(Liion)cells with different cathode materials(LiFePO4(LFP),Li[Ni_(1/3)Co_(1/3)Mn_(1/3)]O_(2)(NCM111),Li[Ni_(0.6)Co_(0.2)Mn_(0.2)]O_(2)(NCM622)and Li[Ni_(0.8)Co_(0.1)Mn_(0.1)]O_(2)(NCM811))were *** results showed that,under the same overcharge condition,the TR of LFP Li-ion cell occurred earlier compared with the NCM Li-ion cells,indicating its poor overcharge tolerance and high TR ***,when TR occurred,LFP Li-ion cell exhibited lower maximum temperature and mild TR *** NCM Liion cells caught fire or exploded during TR,while the LFP Li-ion cell only released a large amount of smoke without *** to the overcharge behaviors and TR features,a safety assessment score system was proposed to evaluate the safety of the *** short,NCM Li-ion cells have better performance in energy density and overcharge tolerance(or low TR risk),while LFP Li-ion cell showed less severe response to overcharging(or less TR hazards).For NCM Li-ion cells,as the ratio of nickel in cathode material increases,the thermal stability of the cathode materials becomes poorer,and the TR hazards *** a comparison study on large format Li-ion cells with different cathode materials can provide deeper insights into the overcharge behaviors and TR features,and provide guidance for engineers to reasonably choose battery materials in automotive applications.

关键词： Lithium-ion battery Cathode materials Overcharge Thermal runaway Overcharge tolerance Safety assessment

Open-source dataset of vehicle state for an electric vehicle on a low-adhesion road

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Science China(Information Sciences) 2022年第3期65卷 258-259页

作者： Shuo CAI Haitao DING Yunfeng HU Lin ZHANG Qin LI Hong CHEN State Key Laboratory of Automotive Simulation and Control Jilin University Department of Control Science and Engineering Jilin University School of Automotive Studies Tongji University collaborative innovation center of electric vehicles in Beijing Beijing Institute of Technology GAC R&D center

This study demonstrates and opens for academic research six sets of electric vehicle data collected during experiments on a low-adhesion road. The 11-dimensional data were collected from a small, single-motor SUV with front-wheel *** data collected for vehicles on low-adhesion roads are crucial for research on system dynamics modeling,stability control system design, and vehicle state estimation. Indeed, all vehicle control systems must be validated on low-adhesion roads, including vehicle models,

关键词： vehicle experimental data dynamics modeling state estimation control system design low adhesion road

Endoplasmic-reticulum-like catalyst coating on separator to enhance polysulfides conversion for lithium-sulfur batteries

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Journal of Energy Chemistry 2022年第4期31卷 423-431页

作者： Sai-Nan Xu Teng Zhao Li-Li Wang Yong-Xin Huang Yu-Sheng Ye Nan-Xiang Zhang Tao Feng Li Li Feng Wu Ren-Jie Chen Beijing Key Laboratory of Environmental Science and Engineering School of Material Science&EngineeringBeijing Institute of TechnologyBeijing 100081China Institute of Advanced Technology Beijing Institute of TechnologyJinan 250300ShandongChina collaborative innovation center of electric vehicles in Beijing Beijing 100081China

Lithium-sulfur(Li-S)batteries with high theoretical specific energy of 2600 Wh kg^(-1) are one of promising candidates for next-generation energy storage ***,the severe shuttle effect of intermediate polysulfides leads to rapid capacity decay during battery cycling,especially at high sulfur loading and high current ***,the MnO nanoparticles covered carbon with endoplasmic-reticulum-like structure(MnO@ERC)as separator coating for Li-S batteries is *** MnO@ERC coating can act as upper current collector to enhance electrical conductivity of cathode and decrease the interface impedance of the whole *** importantly,both the polar MnO nanoparticles and Mn_(3)O_(4) formed at the end of the charging process can catalyze the conversion of lithium polysulfides,which is convinced by the high adsorption energy and the elongate S–S *** a result,Li-S batteries based on MnO@ERC coating separator showed stable cycle for 350 cycles under 0.5C,high discharge specific capacity of 783.6m Ah g^(-1) after 100 cycles at 0.2 C,534.7 m Ah g^(-1) after 100 cycles under the sulfur loading of 5.26 mg cm;and low self-discharge rate of 9.1%after resting 48 h..

关键词： MnO/Carbon catalysis Endoplasmic-reticulum-like structure Separator coating Lithium-sulfur batteries

Lithiated VO2(M)@Carbon Fibers Hybrid Host for Improving the Cycling Stability of Sulfur Cathode in Lithium-Sulfur Batteries

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Chinese Journal of Chemistry 2020年第12期38卷 1703-1708页

作者： Yuxin Wang Ling Zhang Jiaying Bi Hao Yang Zhikun Zhao Daobin Mu Borong Wu School of Materials Science and Engineering Beijing Key Laboratory of Environment Science and EngineeringBeijing Higher Institution Engineering Research Center of Power Battery and Chemical Energy MaterialsBeijing Institute of TechnologyBeijing 100081China collaborative innovation center of electric vehicles in Beijing Beijing 100081China

of main observation and conclusion We successfully prepared the Li-VO2(M)nanosheets via a facile lithiation *** compositing with conductive carbon fibers,the sulfur host(Li-VO2(M)@CFs)combines the efficient adsorption ability of the VO2(M)with superior electronic conductivity of the carbon ***,carbon fiber cloth used as the current collector can provide the 30 electronic ***,the coin cells exhibited the superior reversible capacity of 1250 mA h g^-1 at 0.2 C and a low capacity decay value of 0.068%per cycle within 416 cycles at 1C,indicative of the favorable cycling ***,even at a high rate of 5C,it also kept at a high discharge capacity of 401 mA h g^-*** conclusion,this work discloses an attractive route to reduce the dissolution loss of lithium polysulfides(UPSs)and enhance the overall performance of Li-S batteries.

关键词： conclusion Sulfur attractive

Multidimensional Co_(3)O_(4)/NiO heterojunctions with richboundaries incorporated into reduced graphene oxide network for expanding the range of lithiophilic host

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InfoMat 2022年第8期4卷 93-104页

作者： Qianqian Meng Minrong Guan Yongxin Huang Li Li Feng Wu Renjie Chen Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijingChina Institute of Advanced Technology Beijing Institute of TechnologyJinanChina collaborative innovation center of electric vehicles in Beijing BeijingChina

The commercial application of lithium(Li)metal anode is hindered by the growth of Li ***,we develop a multidimensional composite struc-ture composed of Co3O4/NiO heterojunction particles and reduced graphene oxide(rGO)nanosheets,that allows Li to nucleate and deposit selectively in one ***,two transition metal oxides(TMOs)without lit-hiophilicity are transformed into lithiophilic species due to the rich phase boundaries and high Li adsorption energies on interfaces,which can provide uniform active sites and reduce nucleation overpotential for Li ***,the rGO substrate with high electrical conductivity and large spe-cific surface area can form a conductive network between TMOs and alleviate volume expansion caused by Li *** from the synergistic effect of the heterojunctions and carbon substrate,the Co_(3)O_(4)/NiO-rGO regu-lates the local current density and enables the dendrite-free Li plating/stripping *** a current density of 1 mA cm^(-2),the Li metal anode with the Co_(3)O_(4)/NiO-rGO host exhibits remarkable electrochemical performance,consistently maintaining high Coulombic efficiency(>93.8%)over 1000 ***,the full cells matched with LiFePO_(4)cathode also display high rate capability of 130 mAh g^(-1)at 1 C and stable cycling life over 500 cycles.

关键词： 3D rGO network lithiophilic host lithium metal anode rich-boundaries heterojunctions