In situ synchrotron wide-angle X-ray scattering study on rapid lithiation of graphite anode via direct contact method for Li-ion capacitors
In situ synchrotron wide-angle X-ray scattering study on rapid lithiation of graphite anode via direct contact method for Li-ion capacitors
复制标题
DOI：
10.1016/j.jpowsour.2015.01.193
复制
发表时间：
2015-06
影响因子：
9.2
通讯作者：
Hyun-chae Park;Minho Kim;Fan Xu;Cheolsoo Jung;S. Hong;C. Koo
中科院分区：
文献类型：
--
作者：
Hyun-chae Park;Minho Kim;Fan Xu;Cheolsoo Jung;S. Hong;C. Koo
石墨阳极预掺杂锂是实现高能量密度锂离子电容器的关键工艺。在本研究中，原位同步加速器广角x射线散射测试直接揭示了直接接触（DC）方法，简单地通过石墨电极与电解质中牺牲的锂金属之间的直接物理接触来实现，在相同掺杂时间水平下，比传统的电子充电器（EC）和外部短路（ESC）方法提供了更快的从阶段1到阶段1的相变。实验结果表明，直流电法制备石墨电极的预锂化速度比EC和ESC法制备的快。
Lithium pre-doping of graphite anode is a key process to achieve high energy density lithium-ion capacitor. In this study, in situ synchrotron wide-angle X-ray scattering examinations directly revealed that the direct contact (DC) method, simply achieved through direct physical contact between graphite electrode and sacrificial lithium metal in electrolyte, provides much faster phase transformation from stage 1ʹ to stage 1 than conventional electronic charger (EC) and external short circuit (ESC) methods at the same doping time level. The observations indicate that DC method achieves faster pre-lithiation rate of graphite electrode than EC and ESC processes.