Nano and microstructure lithium ion battery anode material ti 2 c microspheres and preparation method thereof

Abstract

The invention provides nano micro-structure lithium ion battery negative electrode material Ti2C microspheres and a preparation method thereof. The Ti2C microspheres are prepared by the following method: (1) soaking a two-dimensional Ti2AlC base material in an HF solution for 10-75h, thereby obtaining a mixed solution containing multilayer two-dimensional Ti2C; (2) performing ultrasonic treatment in ultrasonic waves for 5-110h, thereby obtaining a mixed solution containing a single-layer two-dimensional Ti2C nano flake; (3) hermetically reacting for 15-45h at temperature of 100-350 DEG C, and filtering or centrifuging, thereby obtaining the nano microstructure Ti2C microspheres; and (4) drying for 8-35h at temperature of 50-100 DEG C, thereby obtaining the micro-structure lithium ion battery negative electrode material Ti2C microspheres. The Ti2C microspheres have the advantages such as high conductivity, short ion transmission distance and large specific surface area of the two-dimensional nano flakes, and show excellent electrochemical performance when serving as a lithium ion battery negative electrode material.

Description

technical field [0001] The invention relates to a nano-microstructure lithium ion battery negative electrode material Ti 2 C microsphere and preparation method thereof, specifically relate to a kind of lithium ion battery negative electrode material Ti 2 C microsphere and its preparation method by chemical etching and hydrothermal synthesis. Background technique [0002] Lithium-ion power batteries have an absolute advantage in the development of the global electric vehicle industry, and its dominant position will not be shaken in the next few decades. With the continuous development of society, it is particularly necessary to develop power batteries with high energy density. Low cost, long life and high safety, as the core elements of power batteries, are closely related to electrode materials. As a key factor determining the overall performance of lithium-ion batteries, the research on negative electrode materials has always been a hot spot in this field. At present, c...

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Problems solved by technology

However, the high specific surface area makes the stability of the material worse, and the side reaction between the electrode and the electrolyte increases; the electrode material is easy to agglomerate, which reduces the volumetric energy density of the battery

[0005] CN103641119A discloses a preparation method of a graphene-like material, which is to use Ti 3 AlC 2 Chemical etching is carried out in HF acid, so that Al is selectively etched away to obtain the graphene-like material, and the prepared Ti 3 C 2 When nanosheets are used as electrode materials for lithium-ion batteries, they are easy to agglomerate due to the large surface activation energy of the nanosheets. At the same time, the high specific surface area makes the stability of the material poor, and the side reactions between the electrode and the electrolyte increase, which affects its electrochemical performance. Performance

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