▎ 摘　　要

NOVELTY - Preparing battery cathode material involves reducing graphene oxide/bismuth composite material, preparing plating solution in the beaker by adding 0.01 wt.% 0.09 milligram per milliliter graphene oxide solution and stirring into a solution on a magnetic stirrer, adding a certain amount of bismuth subnitrate pentahydrate to a concentration of 10-100 millimole per liter, adding sodium hydroxide solution to adjust the pH to the solution clarification, using flexible carbon cloth as the working electrode, graphite rod as the counter electrode, mercury-mercury oxide electrode as the reference electrode, and the above prepared solution used as a plating solution for constant voltage plating. The plating voltage is between (-)0.9-(-)1.6 volt, and the plating time is adjusted according to the required electrode load. The electroplated carbon cloth is immersed in deionized water to remove the surface electrolyte, and then dried on a hot stage. USE - Method for preparing battery cathode material used in flexible water battery (claimed). ADVANTAGE - The method enables to prepare a battery cathode material has simple operation, consumes less energy, wide source of raw materials and easy mass production. DETAILED DESCRIPTION - Preparing a battery cathode material involves reducing graphene oxide/bismuth composite material, preparing plating solution in the beaker by adding 0.01 wt.% 0.09 milligram per milliliter graphene oxide solution and stirring into a solution on a magnetic stirrer, adding a certain amount of bismuth subnitrate pentahydrate to a concentration of 10-100 millimole per liter, adding sodium hydroxide solution to adjust the pH to the solution clarification, using flexible carbon cloth as the working electrode, graphite rod as the counter electrode, mercury-mercury oxide electrode as the reference electrode, and the above prepared solution used as a plating solution for constant voltage plating. The plating voltage is between (-)0.9-(-)1.6 volt, and the plating time is adjusted according to the required electrode load. The electroplated carbon cloth is immersed in deionized water to remove the surface electrolyte, and then dried on a hot stage. The obtained product is slowly smeared multiple times in a graphene oxide solution, and the sample is dried on a hot stage and repeated smear-heat drying multiple times to obtain a graphene-ruthenium composite coated with graphene oxide. An INDEPENDENT CLAIM is included for a battery cathode material, which is obtained by reducing graphene oxide/bismuth composite material having a fine three-dimensional structure, and side wall of thethree-dimensional network structure layer overlapping with the reduction-oxidation grapheneby bismuth.