Hysteresis during Lithium Insertion in Hydrogen‐Containing Carbons
Hysteresis during Lithium Insertion in Hydrogen‐Containing Carbons
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DOI：
10.1149/1.1836972
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发表时间：
1996-07
影响因子：
3.9
通讯作者：
T. Zheng;W. Mckinnon;J. Dahn
中科院分区：
文献类型：
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作者：
T. Zheng;W. Mckinnon;J. Dahn
作者研究了在700℃附近加热的含氢碳中锂的插入情况，发现具有大滞后的高容量(锂在近0V插入这些碳中，在近1V时脱除)与样品中的氢含量成正比。据认为，锂原子可能结合在六方碳碎片的氢端边缘，导致键从sp{sup 2}变为sp{sup 3}。作者使用不同的充放电速率和循环温度仔细地研究了锂在含氢碳中的电化学插入。这些测量使磁滞得以量化。一个简单的模型，它把成键的变化视为一个激活的过程，用来定性地模拟细胞中的滞后现象。
The authors studied lithium insertion in hydrogen-containing carbons heated at temperatures near 700 C. High capacities with large hysteresis (lithium insertion into these carbons at nearly 0 V and removal at nearly 1 V) were shown to be proportional to the hydrogen content of the samples. It is believed that the lithium atoms may bind on hydrogen-terminated edges of hexagonal carbon fragments, causing a change in the bond from sp{sup 2} to sp{sup 3}. The authors have carefully studied the electrochemical insertion of lithium in hydrogen-containing carbons using a variety of charge-discharge rates and cycling temperatures. These measurements allow the hysteresis to be quantified. A simple model, which treats the bonding change as an activated process, is used to model the hysteresis in the cells qualitatively.