Lithium ion battery cathode material NiS/Ni and preparation method thereof

Abstract

The invention provides a lithium ion battery cathode, which is characterized by having a structure of NIS / Ni. The preparation method of the cathode includes: putting thiourea in a container, then adding a proper amount of deionized water and hydrogen peroxide, fully stirring the mixture to obtain a uniform solution; and transferring the obtained uniform solution into a hydrothermal reaction kettle inner container, placing several pieces of foamed nickel into the hydrothermal reaction kettle, carrying out reaction at 90-150DEG C for 4-10h, and performing natural cooling to obtain an NiS / Ni sample. The electrode preparation method is simple, the cost is low, and the controllability is high. The temperature of the hydrothermal reaction is low and the time is short. The NiS in the prepared NiS / Ni uniformly grows on the foamed nickel surface and is composed of a large number of particles, and the particle size is about 100nm. The prepared material has high charge-discharge capacity and excellent cycle performance.

Description

Technical field: [0001] The invention relates to a negative electrode of a lithium ion battery, in particular to a method for preparing a negative electrode of a NiS / Ni lithium ion battery, and belongs to the field of electrochemical power sources. technical background: [0002] Due to its high energy density, long cycle life, and environmental friendliness, lithium-ion batteries are not only widely used in portable electronic devices, but are also being developed in the fields of power vehicles and energy storage power stations. The development of high-performance lithium-ion batteries is of great significance to the development of future electronic products, power vehicles and energy storage power stations. [0003] At present, the positive electrode materials are mainly lithium-containing transition metal oxides, and their theoretical lithium storage capacity is low. It is unlikely to greatly increase their capacity on the basis of the existing positive electrode materi...

AI Technical Summary

Problems solved by technology

The main problem of conversion materials is that the conductivity of the material is poor, and the morphology and structure of the material will be destroyed during the cycle, resulting in unsatisfactory electrochemical performance.

However, due to the high thermodynamic stability of Ni, it is difficult to react with sulfur sources to obtain NiS in a hydrothermal environment.

Based on the above background, this patent invented a hydrothermal method to prepare NiS / Ni composite structure, which shows high specific capacity and excellent cycle stability as the negative electrode of lithium ion battery, and no relevant research has been reported.

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