【摘要】 磷酸铁锂电池的容量衰退速率与程度受到运行环境及充放电倍率的影响，当磷酸铁锂电池应用在新型电力系统时，若风光发电利用率不高，磷酸铁锂电池将长期处于满充搁置状态。为探究磷酸铁锂电池作为储能装置应用时，其搁置状态下的寿命衰退机理，以20 Ah的磷酸铁锂电池作为研究对象，模拟电池在45℃环境搁置的场景，并在不同的容量衰减阶段利用增量容量法分析磷酸铁锂电池的老化原因。结果表明，在高温搁置条件下LFP电池的容量衰减主要与正极活性物质的损失相关。在此基础上，建立了高温搁置天数与容量退化的关系。研究结果为新型电力系统中储能装置的寿命预测和经济性评估提供了依据。更多还原

【Abstract】 The capacity degradation of lithium iron phosphate(LFP) batteries is influenced by working conditions and charge-discharge rates. In new energy systems, LFP batteries may remain idle for extended periods due to lower utilization of renewable energy. To investigate the aging mechanism of LFP batteries as energy storage devices under idle conditions, this study focused on a 20 Ah LFP battery stored at 45 ℃ to simulate idle conditions. Incremental capacity analysis(ICA) was used to study the aging mechanism at different capacity degradation stages. The results indicate that under hightemperature idle conditions, the performance degradation of the battery is mainly related to the loss of positive electrode active materials. Based on this, a relationship between the number of days stored at high temperatures and capacity degradation was established. The research findings provide a basis for predicting the lifespan and economic evaluation of energy storage devices in new energy systems.更多还原