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Local Structure of Ball-Milled Carbons for Lithium Ion Batteries: A Pair Distribution Function Analysis

Published online by Cambridge University Press:  10 February 2011

A. Claye ,
P. Zhou ,
J. E. Fischer ,
F. Disma  and
J-M. Tarascon
A. Claye
Affiliation:
LRSM, University of Pennsylvania, Philadelphia PA 19104, USA
P. Zhou
Affiliation:
LRSM, University of Pennsylvania, Philadelphia PA 19104, USA
J. E. Fischer
Affiliation:
LRSM, University of Pennsylvania, Philadelphia PA 19104, USA
F. Disma
Affiliation:
LRCS, Université de Picardie Jules Verne, 80039 Amiens, France
J-M. Tarascon
Affiliation:
LRCS, Université de Picardie Jules Verne, 80039 Amiens, France
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Abstract

The local atomic structure of ball-milled carbons was investigated by radial distribution function (RDF) analysis using pulsed time-of-flight neutron diffraction. The results exhibit a gradual loss of long-range order as a function of milling time. Modeling of the elastic structure factors and of the differential correlation functions identified the structure of ball-milled carbons as finite-size graphene fragments whose size decreases continuously with milling time. The large increase in lithium reversible capacity after 20 hours of milling was correlated with the loss of interlayer correlation between graphite flakes, similar to the structure of hard carbons in the “House of Cards” model.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 563
Copyright
Copyright © Materials Research Society 1998

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References

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