Effects of heat-treatment on electrochemical behavior |
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| Authors: | Ando N Tasaki S Hato Y Marumo C Natsume Y Ohmori S Ito A Tanaka K |
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| Institution: | (1) R and D Group for Batteries and Functional Carbon Materials, Kanebo Ltd, Kanebo-cho, Hofu-shi, Yamaguchi 747-0823, Japan;(2) Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan |
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| Abstract: | The polyacenic semiconductive (PAS) material is a typical amorphous carbon prepared by pyrolysis of phenolformaldehyde resin,
and is actually utilized as anode of high-capacity rechargeable batteries. In this work, change in the discharging amount
of Li+ before and after heat-treatment of the PAS electrodes at the various doping level was examined in detail. As a result, the
doped Li can be classified into two types: (i) heat-resistant Li-dopant (or Li-dopant with high diffusion coefficient) and
(ii)heat-fragile Li-dopant (or Li-dopant with low diffusion coefficient). The latter Li-dopants are generated above the doping
level of 30% (Li]/C]→0.3) and is considered to be the origin of high-capacity of PAS anode compared with that of graphite
anode. This aspect is also supported by the ESR, 7Li-NMR, and XPS observation results.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | Li ion battery charge-discharge characteristics amorphous carbon heat-treatment electrochemistry |
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