Method for preparing electrode

The invention belongs to the technical field of a lithium ion battery and particularly discloses a method for preparing an electrode. The method comprises the following steps of: forming an active material layer on a collector, and then forming a heat resistant layer on the active material layer. The forming method of the heat resistant layer comprises the following steps of: mixing nano aluminium sesquioxide, an addition agent and a dispersing agent, then adding a binder for ultrasonic dispersion, and preparing a sizing agent of the heat resistant layer; coating the sizing agent of the heat resistant layer on the active material layer, and drying; and the addition agent is polybasic aliphatic ketones. The electrode prepared with the method has the advantages that the thickness of film layers of the heat resistant layer is uniform, and the transfer diffusion process of each part of electrons and ions is consistent. When a battery has an internal short-circuited phenomenon, the efficacy of the heat resistant l