High energy density capacitor is a key device to power supply source for electromagnetic gun (EMG) system, and extending its lifetime is important for increasing the reliability of the power source. Working in high el...High energy density capacitor is a key device to power supply source for electromagnetic gun (EMG) system, and extending its lifetime is important for increasing the reliability of the power source. Working in high electric field could affect the capacitor lifetime, and this effect on metallized polypropylene film capacitors (MPPFCs) in pulsed-power applications is studied and presented. Experimental re- sults show that the lifetime of MPPFCs decreases with the increasing peak value of charged electric field, and this decrease could be described by function (L/L0) ∝ (E/E0)–m, where, m=7.32. The lifetime of MPPFCs also decreases with the increase of the reversal coeffi- cients in underdamped circuits, which could be described by (L/L0) ∝ (ln(1/K0)/(ln(1/K))–b, where, b=0.7. These results provide a basis for the lifetime prediction of MPPFCs in pulsed-power applications.展开更多
Li metal is considered an ideal anode material because of its high theoretical capacity and low electrode potential.However,the practical usage of Li metal as an anode is severely limited because of inevitable parasit...Li metal is considered an ideal anode material because of its high theoretical capacity and low electrode potential.However,the practical usage of Li metal as an anode is severely limited because of inevitable parasitic side reactions with electrolyte and dendrites formation.At present,single-component artificial solid electrolyte interphase cannot simultaneously meet the multiple functions of promoting ion conduction,guiding lithium ion deposition,inhibiting dendrite growth,and reducing interface side reactions.Therefore,multi-component design on Li metal surface is widely investigated to achieve long-term cycling.Herein,we report a Li_(2)Ga-carbonate polymer interphase layer to solve volume changes,Li dendrites formation and side-reactions.As a result,the Li symmetric cell can be stabilized at 3.0 m A/cm^(2)in carbonate electrolyte with limited volume of 20μL.Coupled with 13.6 mg/cm^(2)(loading of 2 mAh/cm^(2))LiFePO_(4)cathode,discharge capacity retains at 90%for over 150 cycles under limited electrolyte conditions.With such an alloy-polymer interphase layer,higher energy density Li metal batteries become prominent in the near future.展开更多
基金Project supported by Opening Foundation of National Engineering Laboratory for UltraHigh Voltage Engineering Technology (Kunming, Guangzhou, China)
文摘High energy density capacitor is a key device to power supply source for electromagnetic gun (EMG) system, and extending its lifetime is important for increasing the reliability of the power source. Working in high electric field could affect the capacitor lifetime, and this effect on metallized polypropylene film capacitors (MPPFCs) in pulsed-power applications is studied and presented. Experimental re- sults show that the lifetime of MPPFCs decreases with the increasing peak value of charged electric field, and this decrease could be described by function (L/L0) ∝ (E/E0)–m, where, m=7.32. The lifetime of MPPFCs also decreases with the increase of the reversal coeffi- cients in underdamped circuits, which could be described by (L/L0) ∝ (ln(1/K0)/(ln(1/K))–b, where, b=0.7. These results provide a basis for the lifetime prediction of MPPFCs in pulsed-power applications.
基金supported by Jilin Province Science and Technology Department Major Science and Technology Project(Nos.20220301004GX,20220301005GX)Key Subject Construction of Physical Chemistry of Northeast Normal University,National Natural Science Foundation of China(Nos.21905110,22102020)+2 种基金National Natural Science Foundation of China(No.21905041)Special foundation of Jilin Province Industrial technology Research and Development(No.2019C042)the Fundamental Research Funds for the Central Universities(No.2412020FZ008)。
文摘Li metal is considered an ideal anode material because of its high theoretical capacity and low electrode potential.However,the practical usage of Li metal as an anode is severely limited because of inevitable parasitic side reactions with electrolyte and dendrites formation.At present,single-component artificial solid electrolyte interphase cannot simultaneously meet the multiple functions of promoting ion conduction,guiding lithium ion deposition,inhibiting dendrite growth,and reducing interface side reactions.Therefore,multi-component design on Li metal surface is widely investigated to achieve long-term cycling.Herein,we report a Li_(2)Ga-carbonate polymer interphase layer to solve volume changes,Li dendrites formation and side-reactions.As a result,the Li symmetric cell can be stabilized at 3.0 m A/cm^(2)in carbonate electrolyte with limited volume of 20μL.Coupled with 13.6 mg/cm^(2)(loading of 2 mAh/cm^(2))LiFePO_(4)cathode,discharge capacity retains at 90%for over 150 cycles under limited electrolyte conditions.With such an alloy-polymer interphase layer,higher energy density Li metal batteries become prominent in the near future.
