▎ 摘　　要

NOVELTY - Preparing ferric oxide-graphene self-supporting electrode material involves dissolving 2-5g iron salt into the 5-40mL de-ionized water to obtain iron salt solution, dissolving 0.66-2g urea into the 5-10mL de-ionized water to obtain urea solution and dissolving 3 wt.% of 4.93-23.66g graphene conductive liquid into the 10-25 mL de-ionized water to obtain graphene dispersion liquid. The graphene dispersion liquid is stirred at 150-400 revolution per minute (rpm) while adding drop-wise iron salt solution and urea solution. USE - Method for preparing ferric oxide-graphene self-supporting material for lithium ion battery cathode material (claimed). ADVANTAGE - The method enables to prepare ferric oxide-graphene self-supporting electrode material improves yield, specific capacity, circulation capacity preservation rate difference of 89.79% and multiplying factor performance difference, and uses firstly 100 milliAmpere per gram (mA/g) cycles for 3 times and secondly 1000mA/g cycles for 500 times of charging capacity ratio that exceeds to 600mAh/g cycles. DETAILED DESCRIPTION - Preparing ferric oxide-graphene self-supporting electrode material involves dissolving 2-5g iron salt into the 5-40mL de-ionized water to obtain iron salt solution, dissolving 0.66-2g urea into the 5-10mL de-ionized water to obtain urea solution and dissolving 3 wt.% of 4.93-23.66g graphene conductive liquid into the 10-25 mL de-ionized water to obtain graphene dispersion liquid. The graphene dispersion liquid is stirred at 150-400 revolution per minute (rpm) while adding drop-wise iron salt solution and urea solution. The obtained mixture is stirred at speed of 150-400 rpm for 20-40 minutes to obtain mixed solution. The volume ratio of iron salt solution and graphene dispersion liquid is 5-40:10-25. The volume ratio of iron salt solution and urea solution is 5-40:5-10. The obtained mixed solution is transferred to the hydrothermal kettle having polytetrafluoroethylene lining and placed in oil bath at 110-220 degrees C at speed of 100-400 rpm for 4-20 hours to obtain first reaction product. The obtained first reaction product is stirred at speed of 150-400 rpm for 5-10 minutes and dispersed uniformly to obtain dispersed suspension. The 0.5-3mL de-ionized water is added to 0.2g dispersed suspension in volume ratio of 0.7:10 and added binding agent solution. The obtained solution is dispersed ultrasonically for 10-30 minutes to obtain suspension. The obtained suspension is subjected to vacuum filtering to obtain second reaction product. The second reaction product is dried through filter membrane to obtain ferric oxide-graphene self-supporting material. The self-supporting material is put into the tubular furnace and heated at speed rate of 2-5 degrees C per minutes at 300-800 degrees C and calcined at 300-800 degrees C for 0.5-10 hours to obtain ferric oxide-graphene self-supporting electrode material.