Rapid charging of lithium-ion batteries using pulsed currents - A theoretical analysis
Rapid charging of lithium-ion batteries using pulsed currents - A theoretical analysis
复制标题
DOI：
10.1149/1.2161580
复制
发表时间：
2006-01-01
影响因子：
3.9
通讯作者：
Landau, U
中科院分区：
文献类型：
--
作者：
Purushothaman, BK;Landau, U
锂离子电池通常使用恒定电流充电，所述恒定电流被施加直到电池电压达到约4.2V，此时，充电在恒定电压下继续，直到获得全电池容量。该过程缓慢，通常需要2-4小时。经验选择的脉冲充电序列已被证明提供增强的充电;然而，不存在模型来解释和优化脉冲充电协议。模拟锂扩散到均匀的嵌入层中表明，在常规恒流充电下约1小时后，锂浓度在石墨/电解质界面处达到饱和，从而强制转换到较低速率的恒压充电。它示出在这里，充电锂电池使用非直流波形与适当选择的参数可以规避这种锂饱和，使充电在显着更高的速率。一个非线性下降的电流密度分布，符合传质系数的变化，以提供完整的充电在不到3 - 4小时，比任何其他脉冲充电研究的配置文件更快。(c)2006年电化学学会。
Lithium-ion batteries are typically charged using constant current that is applied until the cell voltage reaches about 4.2 V, at which time, charging continues at a constant voltage until the full battery capacity is attained. This process is slow, typically requiring 2-4 h. Empirically selected pulse-charging sequences have been shown to provide enhanced charging; however, no model exists to explain and optimize the pulse-charging protocols. Modeling the lithium diffusion into a homogeneous intercalant layer indicates that the lithium concentration reaches saturation at the graphite/electrolyte interface after about 1 h under conventional constant current charging, mandating the shift to the lower rate constant voltage charging. It is shown here that charging the lithium battery using non-dc waveforms with properly selected parameters may circumvent this lithium saturation, enabling charging at significantly higher rates. A nonlinearly decreasing current density profile which conforms to the mass transfer coefficient variation was shown to provide complete charging in less than 3 4 of an hour, faster than any other pulse-charging profile studied. (c) 2006 The Electrochemical Society.