Method for detecting residual alkali on surface of sodium ion battery positive electrode material

The invention relates to a method for detecting residual alkali on the surface of a sodium ion battery positive electrode material. The method comprises the following steps: measuring the carbon content of a to-be-detected sample through a carbon-sulfur method under the action of an acidic additive and a fluxing agent, and further calculating the content of residual alkali in the to-be-detected sample; the fluxing agent comprises a first fluxing agent and a second fluxing agent; the first fluxing agent is metal tungsten, and the second fluxing agent is one or more of iron, copper and tin. Preferably, a to-be-detected sample is further pretreated, specifically, the to-be-detected sample is sintered in the CO2 atmosphere, the pretreated to-be-detected sample is obtained, and then the to-be-detected sample is detected. Compared with a traditional titration method, the method is simple and convenient to operate, high in data reliability and good in repeatability. 本发明涉及一种钠离子电池正极材料表面残碱的检测方法。本发明将待测样品在酸性添加剂和助熔剂的作用下，通