High-energy-density lithium iron phosphate system soft packaging battery and preparation method thereof

The invention discloses a high-energy-density lithium iron phosphate system soft packaging battery and a preparation method thereof; the energy density improvement can be realized in two aspects of enhancing the conductivity of lithium iron phosphate and reducing the soft packaging battery cell weight; a carbon nanometer tube with a one-dimensional linear structure is introduced; the bigger length-to-diameter ratio is realized; a compact one-dimensional conductive network is formed, so that the positive electrode polarization is small; the conductivity is improved; the power circulation performance is good; the voltage platform is higher; meanwhile, the energy density improvement can be realized through the weight reduction by coating a carbon aluminum foil, coating a carbon copper foil, using a double-side ceramic diaphragm, controlling the liquid preservation coefficient and the like. 本发明公开了种高能量密度磷酸铁锂体系软包电池及其制备方法，通过增强磷酸铁锂的导电性及减轻软包电芯重量这两方面实现能量密度的提升，引入了具有维线性结构的碳纳米管，具备较大的长径比，形成致密的维导电网络，使正极极化小，导电性提高，倍率循环性好，电压平台