Method for preparing LATP solid electrolyte with blocking electrode in one step at low temperature

Abstract

The invention discloses a low-temperature one-step preparation method of an LATP solid electrolyte with a blocking electrode, which is characterized in that a gold foil and a green body dropwise added with a proper amount of liquid phase are co-sintered at a low temperature to solve the problems of lithium loss, impurity phase generation and the like which are easy to generate when the LATP electrolyte is sintered at a high temperature. The preparation method has the following advantages: (1) the LATP solid electrolyte can be prepared at a low temperature of 140-280 DEG C, and the process steps are simple; and (2) sintering into a sheet and a subsequent step of magnetron sputtering or silver paste coating for testing conductivity are combined into a whole, an electrolyte with a flat surface, continuous blocking electrode conductivity and uniform and controllable thickness can be realized after the sintering of the green body is completed, gold plating can be realized without magnetron sputtering, the production cost is low, a silver paste layer with a relatively large thickness is also avoided, the implementation is easy, and the production efficiency is high. The method is high in repeatability and time-saving, and is mainly used for preparing the LATP solid electrolyte with the blocking electrode on the surface in one step.

Description

Technical field [0001] The present invention belongs to the field of oxide solid electrolyte, and more particularly to a method of preparing a LATP solid electrolyte with an occlusion electrode at a low temperature. Background technique [0002] At present, most lithium-ion batteries are used to transmit lithium ions using organic electrolyte, but these organic electrolytes have a certain safety hazard. When the internal heat is short-circuited, it produces a large amount of heat, it is easy to combustion or even explosion and other serious safety accidents. And the liquid electrolyte is also easy to have a side reaction at the electrode interface, resulting in an occurrence of a problem such as electrolyte leakage. From the safety problem, the researchers began using solid electrolytes as a lithium ion battery electrolyte. [0003] In various ceramic solid electrolytes, titanium aluminum (LATP) oxide electrolyte is considered to be a very promising choice because they exhibit cl...

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Problems solved by technology

Magnetron sputtering has fast deposition speed, low substrate temperature rise, and little damage to the film layer. Different metals, alloys, and oxides can be mixed and sputtered on the substrate at the same time; however, there is plasma instability and strong magnetism cannot be achieved. The low temperature and high speed sputtering of materials, the target utilization rate of magnetron sputtering target is not high, generally less than 40% and so on

Conductive silver paste can not only be cured at low temperature, has good adhesion and coverage, and its resistance value is low, but its agglomeration phenomenon causes the conductivity of the paste to decrease, and the adhesion of the silver conductor decreases after curing to form a film, resulting in silver particles. Insufficient such as shedding

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