Preparation method of lithium battery cathode ultrathin nano material with high rate capability

Abstract

The invention relates to a preparation method of a lithium battery cathode ultrathin nano material with high rate capability. The preparation method comprises the following steps: dispersing a sulfursource to a high-boiling-point solvent to obtain a precursor A of a sulfur source; under continuous stirring and protective atmosphere, adding a titanium source into the precursor A to obtain a mixedsolution B, wherein a mole ratio of a titanium source to the sulfur source is 1: (0.5 to 3); heating the mixed solution B to 250 to 320 DEG C, and preserving the heat for 30 to 180 min; at the end ofheat preservation, cooling the mixed solution to room temperature, and performing separation, cleaning and drying to obtain the lithium battery cathode ultrathin nano material with high rate capability. According to the preparation method disclosed by the invention, a transition-family metal sulfide in a two-dimensional layered material is synthesized by adopting a chemical solution method, so that a high-temperature and high-long-time-consumption solid phase process and complicated equipment are avoided; the whole process is convenient and easy to operate; only the heat preservation is performed at 250 to 320 DEG C for 30 to 180 min; the repetitiveness is high.

Description

technical field [0001] The invention belongs to the field of nanometer material growth, and in particular relates to a method for preparing an ultrathin nanometer material for lithium battery negative electrodes with high rate performance. Background technique [0002] Since ancient times, energy issues have always been an important issue related to the development of countries around the world and people's lives. The development of high specific energy and high stability energy storage devices will become more and more important. Since the beginning of the new century, the country has put the construction of ecological civilization on the national agenda, and people have also begun to vigorously advocate low-carbon economy and low-carbon life. Pure electric vehicles (BEV) and hybrid electric vehicles (HEV) have also received strong support from governments. The core and main power source of pure electric vehicles and hybrid vehicles is the power battery. Pure electric vehic...

AI Technical Summary

Problems solved by technology

First, TiS 2 Polycrystalline samples are typically prepared by solid-state reaction methods, often requiring an additional annealing step that can take several days

Even so, differences in sample composition caused by temperature gradients inside the high-temperature furnace are often unavoidable

Second, although there is also liquid-phase synthesis (Chinese patent CN 103991900 A), the reactants used are highly toxic and harmful to the health of experimenters. CS 2 is a poisonous substance that damages nerves and blood vessels, and CS 2 Extremely flammable and irritating, it will produce toxic sulfide fumes when heated and decomposed, and it is also relatively easy to cause combustion and explosion

Images