储能电站用磷酸铁锂电池循环老化机理研究

Research on cycle aging mechanism of lithium iron phosphate battery for energy storage power station

以储能电站用磷酸铁锂电池为对象,研究了其在不同温度和倍率条件下的循环性能及老化机理,为优化储能电站充放电策略,提升储能电池循环性能提供理论依据。结果表明高温、大倍率充放电循环均可加速储能电池老化,储能电池容量衰减的主导因素是活性锂离子损失及隔膜孔隙率降低。

Taking the lithium iron phosphate battery for energy storage power station as the object,the cycle performance and aging mechanism of the battery under different temperature and rate conditions were studied.Theoretical basis for optimizing the charging and discharging strategies of energy storage power plants is provided,and the cycle performance of energy storage lithium ion batteries is improving.The results show that high temperature and large magnification charge and discharge cycle can accelerate battery aging.The main reasons for the decline of lithium ion battery capacity are the loss of active lithium ions and the decrease in the porosity of the separator.