Solid-state batteries(SSBs) with high safety are promising for the energy fields,but the development has long been limited by machinability and interfacial problems.Hence,self-supporting,flexible Nano LLZO CSEs are pr...Solid-state batteries(SSBs) with high safety are promising for the energy fields,but the development has long been limited by machinability and interfacial problems.Hence,self-supporting,flexible Nano LLZO CSEs are prepared with a solvent-free method at 25℃.The 99.8 wt% contents of Nano LLZO particles enable the Nano LLZO CSEs to maintain good thermal stability while exhibiting a wide electrochemical window of 5.0 V and a high Li~+ transfer number of 0.8.The mean modulus reaches 4376 MPa.Benefiting from the interfacial modulation,the Li|Li symmetric batteries based on the Nano LLZO CSEs show benign stability with lithium at the current densities of 0.1 mA cm^(-2),0.2 mA cm^(-2),and 0.5 mA cm^(-2).In addition,the Li|LiFePO_(4)(LFP) SSBs achieve favorable cycling performance:the specific capacity reaches128.1 mAh g^(-1) at 0.5 C rate,with a capacity retention of about 80% after 600 cycles.In the further tests of the LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811) cathodes with higher energy density,the Nano LLZO CSEs also demonstrate good compatibility:the specific capacities of NCM811-based SSBs reach 177.9 mAh g^(-1) at 0.5 C rate,while the capacity retention is over 96% after 150 cycles.Furthermore,the Li|LFP soft-pack SSBs verify the safety characteristics and the potential for application,which have a desirable prospect.展开更多
The development of high-performance batteries is inseparable from the exploration of new materials.Among them,fullerene C60 as an allotrope of carbon has many unique properties that are beneficial for battery applicat...The development of high-performance batteries is inseparable from the exploration of new materials.Among them,fullerene C60 as an allotrope of carbon has many unique properties that are beneficial for battery applications,including precise structure,controllable derivatization,good solubility,and rich redox chemistry.In this review,we summarize the recent progress of fullerene-based materials in the field of rechargeable batteries and the key issues that need to be solved in the future application of fullerene.We hope this review can provide guidance and stimulate research about the applications of fullerenes in the field of energy storage.展开更多
A novel method is introduced for preparing iron nanoparticles from iron pentacar- bonyl using an atmospheric microwave plasma. The prepared iron nanoparticles were characterized by transmission electron microscopy and...A novel method is introduced for preparing iron nanoparticles from iron pentacar- bonyl using an atmospheric microwave plasma. The prepared iron nanoparticles were characterized by transmission electron microscopy and X-ray diffraction. The results show that the size of the particles can be controlled by adjusting the microwave power and the flow rate of the carrier gas. The magnetic properties of the synthesized iron particles were studied and a saturation magnetiza- tion of ~95 emu/g was obtained. The convenient preparation process and considerable production rate were also found to be satisfactory for industrial applications.展开更多
A low voltage circuit breaker(LVCB)is an important piece of protection equipment which will switch off the fault current in a power system.The moving contact of a low voltage circuit breaker with a higher rated curren...A low voltage circuit breaker(LVCB)is an important piece of protection equipment which will switch off the fault current in a power system.The moving contact of a low voltage circuit breaker with a higher rated current consists of two parallel contacts.Therefore,the convection effect on the air arc evolution process in a two parallel contact system is analyzed.A threedimensional(3 D)magneto–hydro–dynamic(MHD)model of arc simulation is built.In this model,the anode consists of two parallel contacts and a bonding conductor.A nonlinear voltage–current density characteristic is employed to represent the near-anode and near-cathode voltage.The current density,arc voltage and currents through every contact are obtained.The influence of convection and conduction on the arc evolution process are quantitatively calculated.The displacements of the arc roots are obtained and the asymmetry of the arc root motion is analyzed.The arc evolution process of a two parallel contact system is preliminarily revealed.展开更多
基金supported by Science and Technology Project of China Southern Power Grid (SZKJXM20230049/090000KC23010038)。
文摘Solid-state batteries(SSBs) with high safety are promising for the energy fields,but the development has long been limited by machinability and interfacial problems.Hence,self-supporting,flexible Nano LLZO CSEs are prepared with a solvent-free method at 25℃.The 99.8 wt% contents of Nano LLZO particles enable the Nano LLZO CSEs to maintain good thermal stability while exhibiting a wide electrochemical window of 5.0 V and a high Li~+ transfer number of 0.8.The mean modulus reaches 4376 MPa.Benefiting from the interfacial modulation,the Li|Li symmetric batteries based on the Nano LLZO CSEs show benign stability with lithium at the current densities of 0.1 mA cm^(-2),0.2 mA cm^(-2),and 0.5 mA cm^(-2).In addition,the Li|LiFePO_(4)(LFP) SSBs achieve favorable cycling performance:the specific capacity reaches128.1 mAh g^(-1) at 0.5 C rate,with a capacity retention of about 80% after 600 cycles.In the further tests of the LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811) cathodes with higher energy density,the Nano LLZO CSEs also demonstrate good compatibility:the specific capacities of NCM811-based SSBs reach 177.9 mAh g^(-1) at 0.5 C rate,while the capacity retention is over 96% after 150 cycles.Furthermore,the Li|LFP soft-pack SSBs verify the safety characteristics and the potential for application,which have a desirable prospect.
基金supported by the fund from the National Key R&D Program of China(2018YFB0905300,2018YFB0905305)the Shenzhen Power Supply Co.,Ltd.research fund for Economic analysis and key technology research of lithium iron phosphate battery system for electric energy storage(090000KK52190063)the National Natural Science Foundation of China(Nos.21975087,U1966214,51902116,21925104,and 51672093)。
文摘The development of high-performance batteries is inseparable from the exploration of new materials.Among them,fullerene C60 as an allotrope of carbon has many unique properties that are beneficial for battery applications,including precise structure,controllable derivatization,good solubility,and rich redox chemistry.In this review,we summarize the recent progress of fullerene-based materials in the field of rechargeable batteries and the key issues that need to be solved in the future application of fullerene.We hope this review can provide guidance and stimulate research about the applications of fullerenes in the field of energy storage.
基金supported by National Natural Science Foundation of China(No.51177085)the State Key Laboratory Foundation of Power System of China(No.SKLD10M07)China Postdoctoral Science Foundation(No.2013M540942)
文摘A novel method is introduced for preparing iron nanoparticles from iron pentacar- bonyl using an atmospheric microwave plasma. The prepared iron nanoparticles were characterized by transmission electron microscopy and X-ray diffraction. The results show that the size of the particles can be controlled by adjusting the microwave power and the flow rate of the carrier gas. The magnetic properties of the synthesized iron particles were studied and a saturation magnetiza- tion of ~95 emu/g was obtained. The convenient preparation process and considerable production rate were also found to be satisfactory for industrial applications.
基金supported by the Natural Science Foundation of Shaanxi Province of China(No.2017ZDJC-16)Shenzhen Power Supply Co.Ltd(No.SZKJXM20170480).
文摘A low voltage circuit breaker(LVCB)is an important piece of protection equipment which will switch off the fault current in a power system.The moving contact of a low voltage circuit breaker with a higher rated current consists of two parallel contacts.Therefore,the convection effect on the air arc evolution process in a two parallel contact system is analyzed.A threedimensional(3 D)magneto–hydro–dynamic(MHD)model of arc simulation is built.In this model,the anode consists of two parallel contacts and a bonding conductor.A nonlinear voltage–current density characteristic is employed to represent the near-anode and near-cathode voltage.The current density,arc voltage and currents through every contact are obtained.The influence of convection and conduction on the arc evolution process are quantitatively calculated.The displacements of the arc roots are obtained and the asymmetry of the arc root motion is analyzed.The arc evolution process of a two parallel contact system is preliminarily revealed.
