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Title: Real-Time TEM Study of Nanopore Evolution in Battery Materials and Their Suppression for Enhanced Cycling Performance

Journal Article · · Nano Letters
ORCiD logo [1];  [1];  [2]; ORCiD logo [3];  [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [4]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [5]
  1. Shanghai Univ. (China). Materials Genome Inst.
  2. Univ. of Illinois, Chicago, IL (United States). Dept. of Mechanical and Industrial Engineering; Argonne National Lab. (ANL), Lemont, IL (United States). Chemical Sciences and Engineering Division
  3. Univ. of Illinois, Chicago, IL (United States). Dept. of Mechanical and Industrial Engineering
  4. Zhejiang Univ., Hangzhou (China). Center for X-mechanics
  5. Argonne National Lab. (ANL), Lemont, IL (United States). Chemical Sciences and Engineering Division

Battery materials, which store energy by combining mechanisms of intercalation, conversion, and alloying, give promisingly high energy density but usually suffer from fast capacity decay due to the drastic volume change upon cycling. Particularly, the significant volume shrinkage upon mass (Li+, Na+, etc.) extraction inevitably leads to the formation of pores in materials and their final pulverization after cycling. It is necessary to explore the failure mechanism of such battery materials from the microscopic level in order to understand the evolution of porous structures. In this work, prototyped Sb2Se3 nanowires are targeted to understand the structural failures during repetitive (de)sodiation, which exhibits mainly alloying and conversion mechanisms. The fast growing nanosized pores embedded in the nanowire during desodiation are identified to be the key factor that weakens the mechanical strength of the material and thus cause a rapid capacity decrease. To suppress the pore development, we further limit the cutoff charge voltage in a half-cell against Na below a critical value where the conversion reaction of such a material system is yet happening, the result of which demonstrates significantly improved battery performance with well-maintained structural integrity. These results may shed some light on electrode failure investigation and rational design of advanced electrode materials with long cycling life.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Natural Science Foundation of China (NSFC); National Science Foundation (NSF) - Directorate for Mathematical and Physical Sciences Division of Materials Research (MPS-DMR); USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1559555
Journal Information:
Nano Letters, Vol. 19, Issue 5; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Recent Progress of In Situ Transmission Electron Microscopy for Energy Materials journal September 2019

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