WorldCat Identities

Wen, Bohua

Overview
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
0
Audience Level
1
  Kids General Special  
Audience level: 0.65 (from 0.53 for Multi-elec ... to 0.88 for Multi-elec ...)

Associated Subjects
Languages