As a new class of materials, tin pyrophosphate stands out due to its high specific capacity and suitable lithium insertion potential. Carbon?coated SnP2O7 particles anchored on a carbon framework (SPO/C@C) have been synthesised by an environmentally friendly approach using phytic acid as a phosphorus and carbon source, with polyethylene oxide (PEO) as an additional carbon source. Experimental results show that the addition of extra carbon layer effectively mitigates the volume expansion of the material and reduces the charge transfer resistance, thereby improving the electronic conductivity and the capacitance contribution ratio. That the SPO/C@C sample with 1.36 g of PEO exhibits excellent dispersion and electrochemical performance. At a current density of 0.5 A/g, the discharge specific capacity is 351.3 mA·h/g after 250 cycles, and at a scan rate of 2.0 mV/s, the capacitance contribution ratio is 60.8%.
