PEN multilayer film of middle temperature solid oxide fuel cell and its producing method

Abstract

This invention relates to PEN multilayer film of warm solid oxide full cell and its processing method characterized by multiple doctor-blading layer by layer or stratified doctor-blading and multi-layer co-rolling, then lour-temp. co-senlering to obtain anode / electrolyte double-layer film, after that, preparation of cathode layer and PEN multilayer, film, in which the thickness of NiO+DCO porous anode layer is 0.5-1 mm, NiO content or crysal size expressing graded distribution along the thickness direction. Weight content varies from 70-80% to 50-60%, crystal size varies from 5-8 um to 1-3 um, DCO electrolyte thickness is 20-150 um, with relative density higher than 96%, and thickness of LaCoO3 porous cathode layer of 30-50 um.

Description

Technical field: [0001] The invention belongs to the technical field of fuel cell manufacturing methods, and particularly relates to material selection, structure design and manufacturing methods for the anode / electrolyte / cathode (PEN) multilayer film of the core component of a flat intermediate temperature solid oxide fuel cell (IT-SOFC). Background technique: [0002] According to the "Solid State Ionics" magazine (Solid State Ionics, Vol.70 / 71, 101-108, 1994), traditional SOFC uses Y 2 O 3 Stable ZrO 2 (YSZ) is used as an electrolyte. Due to the low conductivity of YSZ, the battery must be operated at a high temperature of 900-1000℃, which imposes strict requirements on the selection of battery connection and sealing materials, and makes the battery cost high and restricts Its promotion and application. Therefore, lowering the operating temperature and developing SOFCs that can operate at moderate temperatures (450-800°C) are the keys to commercialization. One of the more effe...

AI Technical Summary

Problems solved by technology

In comparison, planar SOFC has the advantages of low cost and easy scale-up of the battery. The disadvantage is that if an electrolyte-supported structure (such as Siemens) is used, in order to make the PEN multilayer film have sufficient strength, the electrolyte membrane The layer must have sufficient thickness; if using DCO or LaCrO 3 As an electrolyte, because its mechanical strength is not as good as YSZ, this problem is particularly prominent; and the increase in the thickness of the electrolyte layer will inevitably increase its ohmic impedance, so that the open circuit voltage and output power of the battery are not high; in addition, due to the electrolyte layer and electrode layer ( Especially the anode layer) has a large difference in thermal expansion coefficient. In order to ensure the dimensional stability of the PEN multilayer film during manufacture and use, appropriate measures must be taken to solve problems such as thermal expansion matching between the multilayer films, such as introducing a transition layer etc., which often complicate material selection and process

However, it is self-supported by the electrolyte, and the thickness of the electrolyte layer in the PEN film in the battery is relatively large, which is not conducive to the further improvement of battery performance; and in the battery supported by its anode, the composition of the anode layer is uniform, which cannot effectively solve the difference in thermal expansion coefficient between the anode and the electrolyte layer. thermal stress caused by