NiS@C nanocomposite material for negative electrode of battery and preparation method of NiS@C nanocomposite material

Abstract

The invention provides a NiS@C nanocomposite material for a negative electrode of a battery and a preparation method of the NiS@C nanocomposite material. The preparation method comprises the following steps: with nickel chloride hexahydrate and thiourea as reactive raw materials, producing NiS by a solvothermal method, then coating the surface of the NiS with carbon by a hydrothermal method, and annealing at high temperature to obtain the NiS@C nanocomposite material. The surface of metal sulfide is coated with the carbon, so that the defects that the sulfide has poor cyclicity and stability can be effectively made up, the cyclicity and the stability of the material are improved, and the conductivity of the material can be improved. As a negative electrode material of a lithium-ion battery, the NiS@C nanocomposite material prepared with the preparation method provided by the invention has relatively good lithium battery performance, relatively high specific capacity and relatively good cycling performance.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a NiS@C nanocomposite material used for battery negative electrodes and a preparation method thereof. Background technique [0002] The development of human society is inseparable from the progress and development of energy. Electrochemical energy storage has become the main energy storage device in the field of consumer electronics due to its cleanliness and high efficiency. Graphite is the most widely used negative electrode material in commercial lithium-ion batteries, but its own theoretical capacity is only 372mAh / g, and the lithium intercalation potential of graphite is close to the lithium stripping voltage, which may cause the formation and growth of lithium dendrites and thus Leading to safety concerns, a new type of anode material for lithium-ion batteries is needed. However, traditional transition metal oxides (about 1000mAh / g) have been restricting the development of ...

AI Technical Summary

Problems solved by technology

Graphite is the most widely used negative electrode material in commercial lithium-ion batteries, but its own theoretical capacity is only 372mAh / g, and the lithium intercalation potential of graphite is close to the lithium stripping voltage, which may cause the formation and growth of lithium dendrites and thus lead to safety concerns, thus requiring a new type of anode material for lithium-ion batteries

However, traditional transition metal oxides (about 1000mAh / g) have been restricting the development of power batteries due to the limitation of their theoretical capacity. Sulfur has a high specific capacity (1675mAh / g), abundant reserves and good cycle performance. Suitable sulfides have become an important direction for the development of sulfur-lithium batteries

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