共 3 条
Influence of pyrolysis conditions on the performance of hard carbons as anodes for lithium batteries
被引:3
作者:
Frackowiak, E
[1
]
Gautier, S
[1
]
Leroux, F
[1
]
Rouzaud, JN
[1
]
Beguin, F
[1
]
机构:
[1] Univ Orleans, CNRS, CRMD, F-45071 Orleans, France
来源:
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
|
2000年
/
340卷
关键词:
hard carbon;
two-step pyrolysis;
carbon anode;
lithium insertion;
Li-7;
NMR;
D O I:
10.1080/10587250008025505
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
Electrochemical lithium insertion/deinsertion has been correlated with the pyrolysis parameters of a polymeric precursor, the microtexture and chemical composition of the obtained hard carbon. A specific reversible capacity of 450 mAh/g (i.e, composition LiC4.5) has been estimated for the optimal carbons from the galvanostatic charge/discharge characteristics. Voltammetry experiments and galvanostatic relaxation curves demonstrated that lithium insertion/extraction process is not kinetically controlled by diffusion, for the current load (20 mA/g) and scan rare used for our experiments. The sites for lithium insertion and/or intercalation were estimated from ex-situ Li-7 NMR experiments for differently lithiated samples. A Knight shift of 60 ppm characteristic of lithium clusters has been found for carbons obtained under strains.
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页码:431 / 436
页数:6
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