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Aggregate 2022年第1期3卷 188-196页

作者： Chaolumen Wu Zhiwei Li yaocai bai Dung To Nosang V.Myung Yadong Yin Department of Chemistry University of CaliforniaRiversideCaliforniaUSA Department of Chemical and Biomolecular Engineering University of Notre DameNotre DameIndianaUSA

As a distinct type of nanocapsules,hollow superstructures of inorganic nanoparticles have attracted increasing attention due to their controllable permeability,convenient functionalization,and efficient surface utilization.Conventionally,they are produced by assembling nanoparticles against expensive sacrificial templates.Herein,a general emulsion-based method is reported to assemble colloidal nanoparticles into submicron hollow superstructures,involving first co-assembly of colloidal nanoparticles with organic additives to form clusters,then overcoating the clusters with a polymer shell,and finally removing the organic additives and re-dispersing nanoparticles by exposing to a good solvent.The key to the success of this process is the re-assembly of nanoparticles against the polymer shells as driven by the capillary force during solvent evaporation,producing hollow superstructures.Such a space-confined assembly process can be well controlled by choice of solvents and their evaporation rates.This general technique provides an open and low-cost platform for creating hollow superstructures of various inorganic nanoparticles,offering many opportunities for exploring unique applications that can take advantage of the collective properties of the constituent nanoparticles and the permeable nanoshell structures.

关键词： emulsion hollow superstructures nanoparticles space-confined assembly

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Effects of charging rates on LiNi_(0.6)Mn_(0.2)Co_(0.2)O_(2)(NMC622)/graphite Li-ion cells

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Journal of Energy Chemistry 2021年第5期30卷 121-126页

作者： Xianyang Wu yaocai bai Zhenglong Li Jue Liu Kejie Zhao Zhijia Du Energy and Transportation Science Division Oak Ridge National LaboratoryOak RidgeTN 37830USA School of Mechanical Engineering Purdue UniversityWest LafayetteIN 47907USA Neutron Scattering Division Oak Ridge National LaboratoryOak RidgeTN 37830USA

Enabling fast charging capability of lithium-ion battery is of great importance to widespread adoption of electric vehicles.Increasing the charging rates from state-of-the-art 2 C(30 min)to 6 C(10 min)requires deep understanding on the cell aging mechanism.In this study,400 mAh pouch cells are cycled at 1 C,4 C and 6 C charging rates with 1 C discharging rate.Capacity fading,cathode structural changes,Li inventory loss,electrolyte composition changes and Li plating on graphite electrodes are thoroughly studied by various characterization techniques.The rapid capacity fading in cells at 6 C charging rate is mainly due to Li inventory loss from cathode structure and metallic Li plating on graphite electrode at higher charging rate.Post-mortem analysis also revealed changes in electrolyte such as increased salt molarity and transesterification during fast charging.

关键词： Li-ion cells Fast charging Post-test analysis Neutron powder diffraction

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