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Nickel oxide microspheres with ferromagnetism and excellent electrochemical performance and synthetic method thereof

A technology of nickel oxide and microspheres, which is applied in the field of nanomaterials, can solve the problems of nanoparticle shedding and reduced cycle performance, and achieve the effects of low equipment requirements, simple preparation technology, and low cost

Inactive Publication Date: 2010-09-15
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, when the particle size is smaller to the nanometer size, the size effect and boundary effect will become more and more important. For example, in magnetic materials, micron-sized nickel oxide has an antiferromagnetic ground state, but the boundary effect of nanoscale particles can make Antiferromagnetic nickel oxide becomes a ferromagnetic material; in lithium-ion battery materials, nanoparticles can improve its specific capacity and rate performance, but nanoparticles are easy to fall off in the electrolyte and permeate through the separator to reduce its cycle performance

Method used

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  • Nickel oxide microspheres with ferromagnetism and excellent electrochemical performance and synthetic method thereof
  • Nickel oxide microspheres with ferromagnetism and excellent electrochemical performance and synthetic method thereof
  • Nickel oxide microspheres with ferromagnetism and excellent electrochemical performance and synthetic method thereof

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example 1

[0013] α-Ni(OH) 2 Preparation: Take 29.8g of Ni(NO 3 ) 2 6(H 2 O) be dissolved in a certain amount of dehydrated ethanol, obtain the solution that cationic concentration is 1mol / L, and move in the reactor of 100ml (filling degree is 70%), react 3 hours in 160 ℃ oven, cool to At room temperature, filter with distilled water and dry to obtain the desired green powder sample. The resulting product is spherical α-Ni(OH) 2 .

example 2

[0015] The preparation of spherical nickel oxide: get α-Ni(OH) obtained in example 1 2 Sinter in a muffle furnace for 2 hours at a reaction temperature of 400 degrees to obtain black nickel oxide. The microspheres are assembled from small particles with a particle size of 15.6 nanometers.

example 3

[0017] The preparation of spherical nickel oxide: get α-Ni(OH) obtained in example 1 2 Sinter in a muffle furnace for 2 hours at a reaction temperature of 700 degrees to obtain black nickel oxide. The microspheres are assembled from small particles with a particle size of 47 nanometers.

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Abstract

The invention relates to nickel oxide microspheres with ferromagnetism and excellent electrochemical performance and a synthetic method thereof. The preparation method comprises the following steps of: preparing alpha-Ni(OH)2 spherical precursors in a hydrothermal environment in the absence of template agent and alkali, and then sintering the precursors at the temperature of above 300 DEG C to form pure-phase nickel oxide microspheres. The size of the nickel oxide microspheres is 1 to 5 microns, each microsphere is assembled by 10 to 100 nanometers, the microspheres have obvious room temperature ferromagnetism, the coercive force of the microspheres can reach 500Oe, the obtained nickel oxide microspheres serve as an electrode material for a lithium ion battery, and the primary discharge capacity of the nickel oxide microspheres is 918mAh / g.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, and is an important direction for developing high-performance nanometer magnetic materials and battery electrode materials. In particular, it is an important method for developing self-assembly of nanomaterials. Background technique [0002] In industry, nickel oxide is an important raw material and functional material, mainly used as a powder raw material for the production of battery electrodes, catalysts, magnetic materials, semiconductors (such as pressure sensitive, thermistors), nickel zinc ferrite, glass and ceramic colorants . The properties of these materials depend to a large extent on the size and shape of nickel oxide, so people use templates to assist in the preparation of nickel oxide particles with various shapes. In the absence of direct use of templates, it was found that ammonia water The ammonia gas released during the heating process can also be used as a soft te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04H01M4/52H01M4/04
CPCY02E60/10
Inventor 李广社唐长林李莉萍
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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