TiNb2O7 material with preferential growth of (010) crystal face and preparation method and application of TiNb2O7 material

Abstract

The invention belongs to the technical field of lithium ion battery materials, and particularly relates to a TiNb2O7 material with preferential growth of a (010) crystal face and a preparation method and application of the TiNb2O7 material. The preparation method comprises the following steps: (1) dispersing a niobium source and a titanium source into a solvent, performing uniform mixing, performing drying, and removing the solvent to obtain a precursor; (2) performing heat treatment on the precursor in an oxygen-containing atmosphere to obtain an intermediate; (3) cooling the intermediate to a tempering temperature according to a set cooling rate, and then performing natural cooling to room temperature to obtain the TiNb2O7 material with preferential growth of the (010) crystal face. The TiNb2O7 material prepared by the method preferentially grows along the (010) crystal face, the migration distance of lithium ions is short, the lithium ions can rapidly migrate along the crystallographic direction, and the TiNb2O7 material has high specific capacity, excellent rate capability and small specific surface area; and when the material is used as a negative electrode of a lithium ion battery, high electrode compaction density and volume energy density can be obtained.

Description

technical field

[0001] The invention belongs to the technical field of lithium ion battery materials, in particular to a TiNb with preferential growth of (010) crystal plane 2 o 7 Materials and their preparation methods and applications. Background technique

[0002] Lithium-ion batteries (LIBs), as one of the most widely used energy storage systems, have been widely used in consumer electronics in the past two decades, and their application has expanded to electric vehicles (EVs), hybrid vehicles ( HEVs), grid energy storage and other emerging fields. The negative electrode is one of the key components of the battery. At present, most commercial lithium-ion batteries use graphite-like carbon materials as negative electrodes. Lithium ion migration rate in graphite materials is slow, the working voltage is low (-0.1V, close to the potential of lithium analysis), and there are poor charge and discharge rate performance and fast charge, Problems such as poor working safety ...

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