A model based method which recruited the extended Kalman filter （EKF） to estimate the full state of charge （SOC） of Li-ion battery was proposed. The underlying dynamic behavior of the cell pack was described based...A model based method which recruited the extended Kalman filter （EKF） to estimate the full state of charge （SOC） of Li-ion battery was proposed. The underlying dynamic behavior of the cell pack was described based on an equivalent circuit comprising of two capacitors and three resistors. Measurements in two tests were applied to compare the SOC estimated by model based EKF estimation with the SOC calculated by coulomb counting. Results have shown that the proposed method is able to perform a good estimation of the SOC of battery packs. Moreover, a corresponding battery management systems （BMS） including software and hardware based on this method was designed.展开更多
In recent years, tungsten disulfide(WS_(2)) and tungsten selenide(WSe_(2)) have emerged as favorable electrode materials because of their high theoretical capacity, large interlayer spacing, and high chemical activity...In recent years, tungsten disulfide(WS_(2)) and tungsten selenide(WSe_(2)) have emerged as favorable electrode materials because of their high theoretical capacity, large interlayer spacing, and high chemical activity;nevertheless, they have relatively low electronic conductivity and undergo large volume expansion during cycling, which greatly hinder them in practical applications. These drawbacks are addressed by combining a superior type of carbon material, graphene, with WS_(2) and WSe_(2) to form a WS_(2)/WSe_(2)@graphene nanocomposites.These materials have received considerable attention in electro-chemical energy storage applications such as lithium-ion batteries(LIBs), sodium-ion batteries(SIBs),and supercapacitors. Considering the rapidly growing research enthusiasm on this topic over the past several years, here the recent progress of WS_(2)/WSe_(2)@graphene nanocomposites in electrochemical energy storage applications is summarized. Furthermore, various methods for the synthesis of WS_(2)/WSe_(2)@graphene nanocomposites are reported and the relationships among these methods, nano/microstructures, and electrochemical performance are systematically summarized and discussed. In addition, the challenges and prospects for the future study and application of WS_(2)/WSe_(2)@graphene nanocomposites in electrochemical energy storage applications are proposed.展开更多
Li-ion hybrid supercapacitors（Li-HSCs） have attracted increasing attention as a promising energy storage device with both high power and energy densities. We report a facile two-step hydrothermal method to prepare t...Li-ion hybrid supercapacitors（Li-HSCs） have attracted increasing attention as a promising energy storage device with both high power and energy densities. We report a facile two-step hydrothermal method to prepare the orthorhombic niobium oxide（T-Nb2O5） nanosheets supported on nitrogen and sulfur co-doped graphene（T-Nb205/NS-G） as anode for Li-HSCs. X-ray diffraction and morphological analysis show that the T-Nb2O5 nano sheets successfully and uniformly distributed on the NS-G sheets. The T-Nb2O5/NS-G hybrid exhibits great rate capability（capacity retention of63.1% from 0.05 to 5 A g^-1） and superior cycling stability（a low capacity fading of ～6.4% after 1000 cycles at 0.5 A g^-1）.The full-cell consisting of T-Nb2O5/NS-G and active carbon（AC） results in high energy density（69.2 W h kg^-1 at0.1 A g^-1）, high power density（9.17 kW kg^-1） and excellent cycling stability（95% of the initial energy after 3000 cycles）.This excellent performance is mainly attributed to the highly conductive NS-G sheets, the uniformly distributed T-Nb2O5 nano sheets and the synergetic effects between them. These encouraging performances confirm that the obtained TNb2O5/NS-G has promising prospect as the anode for Li-HSCs.展开更多
文摘A model based method which recruited the extended Kalman filter （EKF） to estimate the full state of charge （SOC） of Li-ion battery was proposed. The underlying dynamic behavior of the cell pack was described based on an equivalent circuit comprising of two capacitors and three resistors. Measurements in two tests were applied to compare the SOC estimated by model based EKF estimation with the SOC calculated by coulomb counting. Results have shown that the proposed method is able to perform a good estimation of the SOC of battery packs. Moreover, a corresponding battery management systems （BMS） including software and hardware based on this method was designed.
基金financially supported by the National Key Research and Development Program of China (No.2020YFB1713500)the Chinese 02 Special Fund (No.2017ZX02408003)+5 种基金Open Fund of State Key Laboratory of Advanced Refractories (No.SKLAR202210)the Opening Project of National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials &Henan Key Laboratory of High-temperature Structural and Functional MaterialsHenan University of Science and Technology (No.HKDNM2019013)the Foundation of Department of Science and Technology of Henan Province (No.212102210219)the Student Research Training Plan of Henan University of Science and Technology (No.2021035)the Undergraduate Innovation and Entrepreneurship Training Program of Henan Province (No.S202110464005)。
文摘In recent years, tungsten disulfide(WS_(2)) and tungsten selenide(WSe_(2)) have emerged as favorable electrode materials because of their high theoretical capacity, large interlayer spacing, and high chemical activity;nevertheless, they have relatively low electronic conductivity and undergo large volume expansion during cycling, which greatly hinder them in practical applications. These drawbacks are addressed by combining a superior type of carbon material, graphene, with WS_(2) and WSe_(2) to form a WS_(2)/WSe_(2)@graphene nanocomposites.These materials have received considerable attention in electro-chemical energy storage applications such as lithium-ion batteries(LIBs), sodium-ion batteries(SIBs),and supercapacitors. Considering the rapidly growing research enthusiasm on this topic over the past several years, here the recent progress of WS_(2)/WSe_(2)@graphene nanocomposites in electrochemical energy storage applications is summarized. Furthermore, various methods for the synthesis of WS_(2)/WSe_(2)@graphene nanocomposites are reported and the relationships among these methods, nano/microstructures, and electrochemical performance are systematically summarized and discussed. In addition, the challenges and prospects for the future study and application of WS_(2)/WSe_(2)@graphene nanocomposites in electrochemical energy storage applications are proposed.
基金supported by the National Natural Science Foundation of China(21576138 and 51572127)China-Israel Cooperative Program (2016YFE0129900)+5 种基金Program for NCET-12-0629,PhD Program Foundation of Ministry of Education of China (20133219110018)the Natural Science Foundation of Jiangsu Province (BK20160828)Post-Doctoral Foundation(1501016B)Six Major Talent Summit (XNY-011)PAPD of Jiangsu Provincethe program for Science and Technology Innovative Research Team in Universities of Jiangsu Province,China
文摘Li-ion hybrid supercapacitors（Li-HSCs） have attracted increasing attention as a promising energy storage device with both high power and energy densities. We report a facile two-step hydrothermal method to prepare the orthorhombic niobium oxide（T-Nb2O5） nanosheets supported on nitrogen and sulfur co-doped graphene（T-Nb205/NS-G） as anode for Li-HSCs. X-ray diffraction and morphological analysis show that the T-Nb2O5 nano sheets successfully and uniformly distributed on the NS-G sheets. The T-Nb2O5/NS-G hybrid exhibits great rate capability（capacity retention of63.1% from 0.05 to 5 A g^-1） and superior cycling stability（a low capacity fading of ～6.4% after 1000 cycles at 0.5 A g^-1）.The full-cell consisting of T-Nb2O5/NS-G and active carbon（AC） results in high energy density（69.2 W h kg^-1 at0.1 A g^-1）, high power density（9.17 kW kg^-1） and excellent cycling stability（95% of the initial energy after 3000 cycles）.This excellent performance is mainly attributed to the highly conductive NS-G sheets, the uniformly distributed T-Nb2O5 nano sheets and the synergetic effects between them. These encouraging performances confirm that the obtained TNb2O5/NS-G has promising prospect as the anode for Li-HSCs.
