Organic-inorganic composite all-solid electrolyte, a preparation method and application thereof

Abstract

The invention discloses an organic-inorganic composite all-solid electrolyte, 40.0 to 80.0 wt% of polyethylene oxide, 15.0 to 30.0 wt% of polypropylene carbonate, 1.0 to 10.0 wt% of pseudo-one-dimensional inorganic fast ionic conductor and 4.0 to 20.0 wt% of lithium salt, which are mainly compose of polyethylene oxide, polypropylene carbonate, lithium salt and pseudo-one-dimensional inorganic fastionic conductor. The preparation method of the invention comprises the following steps: (1) adding a quasi-one-dimensional inorganic fast ionic conductor into a lithium salt solution, stirring, and uniformly dispersing; (2) sequentially adding polyethylene oxide and polypropylene carbonate into the solution after the step (1), stirring, and uniformly dispersing; (3) coating the mixed solution after the step (2) on the film-forming substrate and drying to obtain the composite electrolyte. The quasi-one-dimensional inorganic fast ionic conductor is introduced into the organic-inorganic composite all-solid electrolyte of the invention, which can effectively reduce the crystallinity, has high ionic conductivity and excellent mechanical properties, and can largely avoid the situation that a lithium dendrite punctures the separator and causes a short circuit inside the battery.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to an organic-inorganic composite all-solid electrolyte and a preparation method and application thereof. Background technique [0002] Most of the current commercial lithium-ion secondary batteries have the following disadvantages: 1. The electrolyte used is mainly an organic electrolyte, and the lithium-ion battery using an organic electrolyte is easy to leak from the battery when it is in use, and there is a potential safety hazard; at the same time , batteries using liquid electrolytes also have potential safety hazards at high temperatures, and because the electrolyte is in a liquid state, it is difficult to process this type of lithium battery into a thin shape, which limits its application range; 2. The mechanical properties of gel polymer electrolytes It is poor and difficult to process and shape, which also limits its development and application. [0003] In or...

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Problems solved by technology

[0002] Most of the current commercial lithium-ion secondary batteries have the following disadvantages: 1. The electrolyte used is mainly an organic electrolyte, and the lithium-ion battery using an organic electrolyte is easy to leak from the battery when it is in use, and there is a potential safety hazard; at the same time , batteries using liquid electrolytes also have potential safety hazards at high temperatures, and because the electrolyte is in a liquid state, it is difficult to process this type of lithium battery into a thin shape, which limits its application range; 2. The mechanical properties of gel polymer electrolytes Poor and difficult to process and shape, which also limits its development and application

The solid-state electrolyte in the all-solid-state lithium-ion secondary battery is a key component of the lithi...

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