Nano solid electrolyte and its preparation method and lithium ion battery

Abstract

The invention provides a nano solid electrolyte, a preparation method thereof and a lithium ion battery. The preparation method of the nano solid electrolyte comprises the following steps: mixing andfiltering a titanium salt and water to obtain a precipitate, and then mixing the precipitate with an acid to obtain a titanium salt solution; mixing the titanium salt solution, a lithium salt and an aluminum salt, then mixing with a solution containing phosphate radicals to obtain sol, and then mixing the sol, a cross-linking agent and an initiator to obtain a gel precursor; and drying the gel precursor, grinding, sintering at high temperature in an inert atmosphere, and calcining in an oxidizing atmosphere to obtain the nano solid electrolyte Li<1+x>Al<x>Ti<2-x>(PO<4>)<3>, wherein X is greater than 0 and less than 1. The nano solid electrolyte is prepared by using the preparation method. The lithium ion battery is prepared by using the nano solid electrolyte. The nano solid electrolyte prepared by the preparation method of the nano solid electrolyte provided by the invention is uniform in particle size distribution, small in particle difference and regular and ordered in morphology.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a nanometer solid electrolyte, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density and long cycle life, and have been widely used in portable electronic products, new energy vehicles and energy storage batteries. At present, commercial lithium-ion batteries generally use organic electrolytes, and there are a large number of volatile, flammable, and explosive organic solvents in the battery system, which brings serious safety hazards to the battery safety system. Compared with liquid electrolytes, inorganic solid-state electrolytes have obvious advantages in safety and thermal stability. Therefore, all-solid-state lithium-ion batteries using inorganic solid-state electrolytes are considered to be necessary to fundamentally solve the safety problems of existing lithium-ion batteri...

AI Technical Summary

Problems solved by technology

In the above synthesis method, the particles contact each other during the high-temperature calcination process, which will inevitably lead to an increase in the particle size of the product. Therefore, the products obtained after calcination are generally micron-scale products. The particle size of this product is too large to be used directly. To make a solid electrolyte, it needs to go through a multi-step grinding process to reduce the particles to submicron or even nanoscale

However, after grinding, the particle size distribution of the product is uneven, and the difference between the particles is relatively large.

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