LATP修饰LCO在高压贫液锂电池中的性能研究

Research on LATP-modified LCO in high-voltage Li-metal cells with lean electrolyte

通过提高锂金属电池的充电电压、正极负载量以及降低电解液用量可以实现超过500 Wh/kg的高比能量。通过Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)对LiCoO_(2)修饰,能够改善锂金属电池在高电压、贫电解液环境中的稳定性,采用行星分散法制备的LATP@LCO具有最佳的综合性能,其在0.1 C下的首次放电比容量为212.0 mAh/g,库仑效率为95.3%,循环85次后的容量保持率为87.8%,其相较于纯LCO 57.8%的容量保持率有明显的提升。这对超高能量密度锂电池的循环寿命提升有重要意义。

Achieving high energy density exceeding 500 Wh/kg in lithium metal batteries can be realized by increasing the charging voltage,positive electrode loading,and reducing the electrolyte amount.Modification of LiCoO_(2)with Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)improves the stability of lithium metal batteries in high voltage and low electrolyte environments.LATP@LCO prepared by planetary dispersion method exhibits the best comprehensive performance,with an initial discharge specific capacity of 212.0 mAh/g at 0.1 C,a coulombic efficiency of 95.3%,and a capacity retention of 87.8%after 85 cycles,showing a significant improvement compared to the pure LCO with a capacity retention of 57.8%.This is of great significance for enhancing the cycling lifespan of ultra-high energy density lithium batteries.