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Title: Deconvolution of Composition and Crystallite Size of Silver Hollandite Nanorods: Influence on Electrochemistry

Journal Article · · Journal of the Electrochemical Society
 [1]; ORCiD logo [1];  [1];  [2];  [2];  [2];  [2];  [3];  [4];  [4]
  1. Stony Brook Univ., NY (United States). Dept. of Chemistry
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Energy Sciences Directorate
  3. Stony Brook Univ., NY (United States). Dept. of Chemistry. Dept. of Materials Science and Chemical Engineering; Brookhaven National Lab. (BNL), Upton, NY (United States). Energy Sciences Directorate
  4. Stony Brook Univ., NY (United States). Dept. of Chemistry. Dept. of Materials Science and Chemical Engineering

In this paper, silver hollandite (Ag1.4Mn8O16) has been synthesized by an aqueous, low-temperature co-precipitation technique to afford silver hollandite with distinct crystallite sizes (10 and 15 nm, identified as S-Ag1.4Mn8O16 and L-Ag1.4Mn8O16, respectively) and equivalent silver content (x), allowing for the deconvolution of electrochemical effects related to crystallite size and silver content. The as-prepared silver hollandite materials were confirmed to be structurally analogous. Notably, TEM imaging reveals a high degree of bundling of S-Ag1.4Mn8O16 nanorods compared to L-Ag1.4Mn8O16 which facilitates more intimate connection of the S-Ag1.4Mn8O16 material with enhanced interparticle contact. The electrochemical behavior and lithium diffusion properties were investigated by galvanostatic cycling, CV, electrochemical impedance, pulsed-discharge experiments, and ex-situ XAS analysis of cycled cathodes. Lithium based electrochemical cells containing S-Ag1.4Mn8O16 delivered a capacity 15X higher than L-Ag1.4Mn8O16 on cycle 1. Ex-situ XAS demonstrated structural change for S-Ag1.4Mn8O16 and formation of Ag0 on insertion of 3.8 Li+ intercalation. However, the samples of L-Ag1.4Mn8O16 were lithiated by a more limited 0.25 molar equivalents, where no significant structural changes were observed. Finally, the findings affirm crystallite size significantly impacts electrochemistry independent of cation occupancy of the α-MnO2 type structure.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Mesoscale Transport Properties (m2M)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; SC0012673; AC02-06CH11357
OSTI ID:
1425104
Report Number(s):
BNL-203324-2018-JAAM
Journal Information:
Journal of the Electrochemical Society, Vol. 164, Issue 14; ISSN 0013-4651
Publisher:
The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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Review of the Stability/Capacity Trade-off in Silver Hollandite Lithium Battery Cathodes journal January 2018