Thick electrode,with its feasibility and cost-effectiveness in lithium-ion batteries(LIBs),has attracted significant attention as a promising approach maximizing the energy density of battery.Through raising the mass ...Thick electrode,with its feasibility and cost-effectiveness in lithium-ion batteries(LIBs),has attracted significant attention as a promising approach maximizing the energy density of battery.Through raising the mass loading of active materials without altering the fundamental chemical attributes,thick electrodes can boost the energy density of the batteries effectively.Nevertheless,as the thickness of the electrode increases,the ionic conductivity of the electrode decreases,leading to abominable polarization in the thickness direction,which severely hampers the practical application of a thick electrode.This work proposes a novel porous gradient design of high-performance thick electrodes for LIBs.By constructing a porous structure that serves as a fast transport pathway for lithium(Li)ions,the ion transport kinetics within thick electrodes are significantly enhanced.Meanwhile,a particle size gradient design is incorporated to further mitigate polarization effects within the electrode,leading to substantial improvements in reaction homogeneity and material utilization.Employing this strategy,we have fabricated a porous gradient nanocellulose-carbon-nanotube based thick electrode,which exhibits an impressive capacity retention of 86.7%at a high mass loading of LiCoO_(2)(LCO)active material(20 mg cm^(-2))and a high current density of 5mA cm^(-2).展开更多
A new model is proposed to estimate Young's modulus and surface electrode resistance of the ionic polymer-metai composite(IPMC)with a gradient distribution of micros true ture.The entire IPMC electrode is divided ...A new model is proposed to estimate Young's modulus and surface electrode resistance of the ionic polymer-metai composite(IPMC)with a gradient distribution of micros true ture.The entire IPMC electrode is divided into two parts,i.e.,the porous metal electrode and the gradient polymer-metai composite electrode,according to the geometrie properties of the electroless plated metal electrode.The validity and accuracy of the model are justified by comparing with the experimental observations of IPMC samples.The differences between model predictions and experimental data of Young's modulus and surface resistance of IPMC samples are+6.8%and-5.5%,respectively,indicating a reasonably good agreement.展开更多
基金financially supported by the National Key R&D Program of China(2023YFB2503900)the National Natural Science Foundation of China(U22A20140,52072138)the Shenzhen Science and Technology Program(JCYJ20220818100418040,JCYJ20220530160816038)。
文摘Thick electrode,with its feasibility and cost-effectiveness in lithium-ion batteries(LIBs),has attracted significant attention as a promising approach maximizing the energy density of battery.Through raising the mass loading of active materials without altering the fundamental chemical attributes,thick electrodes can boost the energy density of the batteries effectively.Nevertheless,as the thickness of the electrode increases,the ionic conductivity of the electrode decreases,leading to abominable polarization in the thickness direction,which severely hampers the practical application of a thick electrode.This work proposes a novel porous gradient design of high-performance thick electrodes for LIBs.By constructing a porous structure that serves as a fast transport pathway for lithium(Li)ions,the ion transport kinetics within thick electrodes are significantly enhanced.Meanwhile,a particle size gradient design is incorporated to further mitigate polarization effects within the electrode,leading to substantial improvements in reaction homogeneity and material utilization.Employing this strategy,we have fabricated a porous gradient nanocellulose-carbon-nanotube based thick electrode,which exhibits an impressive capacity retention of 86.7%at a high mass loading of LiCoO_(2)(LCO)active material(20 mg cm^(-2))and a high current density of 5mA cm^(-2).
基金supported by the National Natural Science Foundation of China[Grant Nos.11372132 and 11502109].
文摘A new model is proposed to estimate Young's modulus and surface electrode resistance of the ionic polymer-metai composite(IPMC)with a gradient distribution of micros true ture.The entire IPMC electrode is divided into two parts,i.e.,the porous metal electrode and the gradient polymer-metai composite electrode,according to the geometrie properties of the electroless plated metal electrode.The validity and accuracy of the model are justified by comparing with the experimental observations of IPMC samples.The differences between model predictions and experimental data of Young's modulus and surface resistance of IPMC samples are+6.8%and-5.5%,respectively,indicating a reasonably good agreement.
