Double-water-system phosphoric acid and sodium ferric pyrophosphate battery and preparation method thereof

The invention provides a double-water-system phosphoric acid ferric pyrophosphate sodium battery, a positive electrode and a negative electrode of the double-water-system phosphoric acid ferric pyrophosphate sodium battery all adopt a water system technology, a water-based binder is used for replacing a traditional organic binder such as polyvinylidene fluoride (PVDF), a solvent is water, organic solvents such as N-methyl pyrrolidone (NMP) and dimethyl sulfoxide (DMSO) do not need to be used for dispersion, high-temperature organic waste gas is not generated in the preparation process, and the double-water-system phosphoric acid ferric pyrophosphate sodium battery is environment-friendly and energy-saving. And meanwhile, the solvent cost and the solvent recovery cost are saved, so that the ferric sodium phosphate pyrophosphate battery is more competitive. And meanwhile, the conductive layer is coated between the two surfaces of the first metal foil of the positive plate and the water-based positive coating, s