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Characteristics of Boron Doped Mesophase Pitch-Based Carbon Fibers as Anode Materials for Lithium Secondary Cells

Published online by Cambridge University Press:  10 February 2011

Toshio Tamaki ,
Toshifumi Kawamura  and
Yoshinori Yamazaki
Toshio Tamaki
Affiliation:
PETOCA, LTD. Researcher, Research Dept. Advanced Material Division 4 Touwada Kamisumachi, Ibaraki PREF, Japan
Toshifumi Kawamura
Affiliation:
PETOCA, LTD. Researcher, Research Dept. Advanced Material Division 4 Touwada Kamisumachi, Ibaraki PREF, Japan
Yoshinori Yamazaki
Affiliation:
PETOCA, LTD. Researcher, Research Dept. Advanced Material Division 4 Touwada Kamisumachi, Ibaraki PREF, Japan
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Abstract

Mesophase pitch-based Carbon Fibers(MCF) have been investigated as anode materials for lithium secondary cells by examining their physical and electrochemical properties. Discharge capacity and initial charge-discharge efficiency of the materials were studied in relation to the heat treatment temperatures of MCF. MCF heat treated at about 3,000° C gave high discharge capacity over 310mAh/g, good efficiency (93 %) and superior current capability of 600mA/g (6mA/cm2). On the other hand, to improve the battery capacity, Boron was doped to the fiber about several % by adding B4C to the pre-carbonized milled fibers and then heat-treated up to 3000°C in Ar. Then heat treated at 2,500°C under vacuum condition to remove remained B 4 C. The structure of Boron-doped fibers was characterized and compared with that of non-doped standard fibers, and also Li ion battery performances are evaluated. The Boron-doped MCF indicated improvement in graphitization and increased discharge capacity as high as 360mAh/g. The voltammograms of both fibers are different from each other. The cell mechanism is discussed based on the unique structure of Boron-doping to the MCF is very effective for the battery performance.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 569
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

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