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Title: Enhanced lithium ion storage in nanoimprinted carbon

Disordered carbons processed from polymers have much higher theoretical capacity as lithium ion battery anode than graphite, but they suffer from large irreversible capacity loss and have poor cyclic performance. Here, a simple process to obtain patterned carbon structure from polyvinylpyrrolidone was demonstrated, combining nanoimprint lithography for patterning and three-step heat treatment process for carbonization. The patterned carbon, without any additional binders or conductive fillers, shows remarkably improved cycling performance as Li-ion battery anode, twice as high as the theoretical value of graphite at 98 cycles. Localized electrochemical strain microscopy reveals the enhanced lithium ion activity at the nanoscale, and the control experiments suggest that the enhancement largely originates from the patterned structure, which improves surface reaction while it helps relieving the internal stress during lithium insertion and extraction. This study provides insight on fabricating patterned carbon architecture by rational design for enhanced electrochemical performance.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Department of Mechanical Engineering, University of Washington, Seattle, Washington 98195-2600 (United States)
  2. Faculty of Materials, Optoelectronics and Physics, and Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, Xiangtan University, Xiangtan 411105, Hunan (China)
  3. College of Metallurgy and Materials Engineering, and Advanced Materials for Energy Institute, Chongqing University of Science and Technology, Chongqing 401331 (China)
Publication Date:
OSTI Identifier:
22486397
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANODES; CAPACITY; CARBONIZATION; DESIGN; ELECTROCHEMISTRY; EXTRACTION; GRAPHITE; HEAT TREATMENTS; LITHIUM; LITHIUM ION BATTERIES; LITHIUM IONS; MICROSCOPY; NANOSTRUCTURES; PERFORMANCE; PVP; RESIDUAL STRESSES; STRAINS; SURFACES