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.
引用
收藏
页码:431 / 436
页数:6
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