Thick electrodes can increase incorporation of active electrode materials by diminishing the proportion of inactive constituents,improving the overall energy density of batteries.However,thick electrodes fabricated us...Thick electrodes can increase incorporation of active electrode materials by diminishing the proportion of inactive constituents,improving the overall energy density of batteries.However,thick electrodes fabricated using the conventional slurry casting approach frequently exhibit an exacerbated accumulation of carbon additives and binders on their surfaces,invariably leading to compromised electrochemical properties.In this study,we introduce a designed conductive agent/binder composite synthesized from carbon nanotube and polytetrafluoroethylene.This agent/binder composite facilitates production of dry-process-prepared ultra-thick electrodes endowed with a three-dimensional and uniformly distributed percolative architecture,ensuring superior electronic conductivity and remarkable mechanical resilience.Using this approach,ultra-thick LiCoO_(2)(LCO) electrodes demonstrated superior cycling performance and rate capabilities,registering an impressive loading capacity of up to 101.4 mg/cm^(2),signifying a 242% increase in battery energy density.In another analytical endeavor,time-of-flight secondary ion mass spectroscopy was used to clarify the distribution of cathode electrolyte interphase(CEI) in cycled LCO electrodes.The results provide unprecedented evidence explaining the intricate correlation between CEI generation and carbon distribution,highlighting the intrinsic advantages of the proposed dry-process approach in fine-tu ning the CEI,with excellent cycling performance in batteries equipped with ultra-thick electrodes.展开更多
Outdated testing methods hinder the success rate of carbonized cable preparation in low-voltage arc fault tests,leading to incomplete tests and high failure rates.To address this issue,we finely categorized the prepar...Outdated testing methods hinder the success rate of carbonized cable preparation in low-voltage arc fault tests,leading to incomplete tests and high failure rates.To address this issue,we finely categorized the preparation results of carbonized cable specimens by analyzing the experimental phenomena during the carbonization process and assessing the impact of high-voltage energization time on the outcomes,presenting a process control strategy aimed at optimizing the preparation results of carbonized cable specimens.This method utilizes three periodic moving algorithms(root-mean-square,average,and shoulder percentage)to classify the cable specimens into four preparation categories:open-circuit carbonization,under-carbonization,short-circuit carbonization,and successful carbonization.The high-voltage energization time during carbonization or secondary carbonization was adjusted to optimize the preparation of the carbonized cables by considering different discrimination outcomes.Finally,the proposed method was tested on a purpose-built carbonized cable experimental platform,which confirmed its effectiveness in differentiating the preparation outcomes of the carbonized cable specimens and improving the success rate of the carbonized cable preparation.The proposed method has significant potential for application in low-voltage arc fault test systems.展开更多
Developing a scalable process is critical to manufacture conductive fabric for commercial applications.This paper describes a scalable coating process that is compatible with existing industrial finishing processes of...Developing a scalable process is critical to manufacture conductive fabric for commercial applications.This paper describes a scalable coating process that is compatible with existing industrial finishing processes of fabrics.In this process,the fabric is continuously dipped in water-based metal salt and the reducing agent solution to impart conductive particles on the fiber surface.After 10 consecutive cycles of dip coating,the fabric shows 6Ω/in.of resistance.The process is tuned to minimize process cost and material cost,and maximize the durability of the fabric.This paper also introduces an easy protective coating technique of the conductive fabric that improves the durability of the conductive fabric without sacrificing the comfort properties of textile fabrics such as breathability and flexibility.The encapsulated conductive fabric shows good air-permeability and it is 6.96 cm^(3)/cm^(2)/s.Moreover,the conductivity of the encapsulated fabric is quite stable after four accelerated washing cycles.Additionally,the fabric remains conductive on the surfaces and is suitable for using as a conductive track and connectors.展开更多
基金supported by the National Key Research and Development Program of China,China(2019YFA0705102)the National Natural Science Foundation of China,China(22179144,22005332)。
文摘Thick electrodes can increase incorporation of active electrode materials by diminishing the proportion of inactive constituents,improving the overall energy density of batteries.However,thick electrodes fabricated using the conventional slurry casting approach frequently exhibit an exacerbated accumulation of carbon additives and binders on their surfaces,invariably leading to compromised electrochemical properties.In this study,we introduce a designed conductive agent/binder composite synthesized from carbon nanotube and polytetrafluoroethylene.This agent/binder composite facilitates production of dry-process-prepared ultra-thick electrodes endowed with a three-dimensional and uniformly distributed percolative architecture,ensuring superior electronic conductivity and remarkable mechanical resilience.Using this approach,ultra-thick LiCoO_(2)(LCO) electrodes demonstrated superior cycling performance and rate capabilities,registering an impressive loading capacity of up to 101.4 mg/cm^(2),signifying a 242% increase in battery energy density.In another analytical endeavor,time-of-flight secondary ion mass spectroscopy was used to clarify the distribution of cathode electrolyte interphase(CEI) in cycled LCO electrodes.The results provide unprecedented evidence explaining the intricate correlation between CEI generation and carbon distribution,highlighting the intrinsic advantages of the proposed dry-process approach in fine-tu ning the CEI,with excellent cycling performance in batteries equipped with ultra-thick electrodes.
基金Supported by the National Natural Science Foundation of China(52277136)the University Production-Study Cooperation Project of Science and Technology Department of Fujian Province(2021Y4002)+1 种基金the 2018 Funding Program for Leading Talents in Scientific and Technological Innovation of Fujian(038000387024)Natural Science Foundation of Fujian Province(2020J05170).
文摘Outdated testing methods hinder the success rate of carbonized cable preparation in low-voltage arc fault tests,leading to incomplete tests and high failure rates.To address this issue,we finely categorized the preparation results of carbonized cable specimens by analyzing the experimental phenomena during the carbonization process and assessing the impact of high-voltage energization time on the outcomes,presenting a process control strategy aimed at optimizing the preparation results of carbonized cable specimens.This method utilizes three periodic moving algorithms(root-mean-square,average,and shoulder percentage)to classify the cable specimens into four preparation categories:open-circuit carbonization,under-carbonization,short-circuit carbonization,and successful carbonization.The high-voltage energization time during carbonization or secondary carbonization was adjusted to optimize the preparation of the carbonized cables by considering different discrimination outcomes.Finally,the proposed method was tested on a purpose-built carbonized cable experimental platform,which confirmed its effectiveness in differentiating the preparation outcomes of the carbonized cable specimens and improving the success rate of the carbonized cable preparation.The proposed method has significant potential for application in low-voltage arc fault test systems.
基金supported by the research grant from Bangladesh University of Textiles,Dhaka,Bangladesh.
文摘Developing a scalable process is critical to manufacture conductive fabric for commercial applications.This paper describes a scalable coating process that is compatible with existing industrial finishing processes of fabrics.In this process,the fabric is continuously dipped in water-based metal salt and the reducing agent solution to impart conductive particles on the fiber surface.After 10 consecutive cycles of dip coating,the fabric shows 6Ω/in.of resistance.The process is tuned to minimize process cost and material cost,and maximize the durability of the fabric.This paper also introduces an easy protective coating technique of the conductive fabric that improves the durability of the conductive fabric without sacrificing the comfort properties of textile fabrics such as breathability and flexibility.The encapsulated conductive fabric shows good air-permeability and it is 6.96 cm^(3)/cm^(2)/s.Moreover,the conductivity of the encapsulated fabric is quite stable after four accelerated washing cycles.Additionally,the fabric remains conductive on the surfaces and is suitable for using as a conductive track and connectors.
