WorldCat Identities

Wen, Bohua

Works: 2 works in 2 publications in 1 language and 3 library holdings
Genres: Academic theses 
Roles: Author
Publication Timeline
Most widely held works by Bohua Wen
Multi-electron transfer of molybdenum/vanadium phosphates as cathodes for lithium-ion batteries by Bohua Wen( )

1 edition published in 2015 in English and held by 2 WorldCat member libraries worldwide

Single-particle measurements of electrochemical kinetics in NMC and NCA cathodes for Li-ion batteries1( )

1 edition published in 2018 in English and held by 1 WorldCat member library worldwide

Abstract : Electrochemical kinetics of Li-ion battery cathodes are measured at single-particle level and combined with transmission X-ray microscopy to elucidate behavior during use. Abstract : The electrochemical kinetics of battery electrodes at the single-particle scale are measured as a function of state-of-charge, and interpreted with the aid of concurrent transmission X-ray microscopy (TXM) of the evolving particle microstructure. An electrochemical cell operating with near-picoampere current resolution is used to characterize single secondary particles of two widely-used cathode compounds, NMC333 and NCA. Interfacial charge transfer kinetics are found to vary by two orders of magnitude with state-of-charge (SOC) in both materials, but the origin of the SOC dependence differs greatly. NCA behavior is dominated by electrochemically-induced microfracture, although thin binder coatings significantly ameliorate mechanical degradation, while NMC333 demonstrates strongly increasing interfacial reaction rates with SOC for chemical reasons. Micro-PITT is used to separate interfacial and bulk transport rates, and show that for commercially relevant particle sizes, interfacial transport is rate-limiting at low SOC, while mixed-control dominates at higher SOC. These results provide mechanistic insight into the mesoscale kinetics of ion intercalation compounds, which can guide the development of high performance rechargeable batteries
Audience Level
Audience Level
  Kids General Special  
Audience level: 0.65 (from 0.53 for Multi-elec ... to 0.88 for Multi-elec ...)

Associated Subjects