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Preparation method of lithium battery LiNi0.5Mn1.5O4 positive electrode material with hollow structure

A cathode material, lithium battery technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of unsatisfactory cycle stability, low ion diffusion rate, etc., achieve excellent ionic conductivity, wide range of raw material sources, preparation simple method effect

Inactive Publication Date: 2014-07-09
JIANGXI UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The object of the present invention is aimed at high-voltage lithium-ion battery cathode material LiNi 0.5 mn 1.5 o 4 To solve the problems of low ion diffusion rate and unsatisfactory cycle stability, a LiNi with a special hollow structure and uniform size is provided. 0.5 mn 1.5 o 4 Cathode material

Method used

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  • Preparation method of lithium battery LiNi0.5Mn1.5O4 positive electrode material with hollow structure
  • Preparation method of lithium battery LiNi0.5Mn1.5O4 positive electrode material with hollow structure
  • Preparation method of lithium battery LiNi0.5Mn1.5O4 positive electrode material with hollow structure

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Embodiment 1

[0036] Under magnetic stirring at room temperature, 1.7075g of manganese sulfate and 4.1163g of sodium bicarbonate were dispersed in 35mL of absolute ethanol, and the solution was added to 700mL of absolute ethanol to immediately generate a white turbid solution. Continue stirring for 3h to complete the reaction. Separate and collect the MnCO by centrifugation 3 After the precursor product, it was washed with absolute ethanol and dried under vacuum at 60°C. X-ray diffraction pattern and electron microscopy photos show that the product is MnCO 3 Microsphere ( figure 2 , image 3 with Figure 4 ). 1.724g of MnCO synthesized by the above method 3 The microspheres were ground and mixed with 1.454 g nickel nitrate and 0.384 g lithium carbonate. The well-ground and mixed solid powder is placed in a muffle furnace and sintered at 800°C for 24 hours in an air atmosphere. X-ray diffraction patterns and transmission electron microscopy photographs indicate that the black product is a h...

Embodiment 2

[0038] At room temperature, the precursor MnCO was prepared according to Example 1 3 Micron spheres, together with 1.454 g nickel nitrate and 0.384 g lithium carbonate, were dispersed in 15 mL of absolute ethanol. After being fully mixed by a planetary ball mill for 1 hour, it is placed in a blast oven for drying, and placed in a muffle furnace at 800°C for 24 hours in an air atmosphere to obtain a hollow structure spinel LiNi 0.5 Mn 1.5 O 4 .

Embodiment 3

[0040] At room temperature, the precursor MnCO was prepared according to Example 1 3 Microsphere, 1.724g of MnCO synthesized by the above method 3 The microspheres were ground and mixed with 1.454 g nickel nitrate and 0.461 g lithium carbonate. The well-ground and mixed solid powder is placed in a muffle furnace and sintered at 800°C for 24 hours in an air atmosphere. Get spinel LiNi with hollow structure 0.5 Mn 1.5 O 4 .

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Abstract

The invention discloses a preparation method of a lithium battery LiNi0.5Mn1.5O4 positive electrode material with a hollow structure. The method comprises the following steps: preparing MnCO3 precursor micro-spheres with high monodispersity and uniform sizes from soluble manganese salt and sodium bicarbonate serving as raw materials at the room temperature by taking water and a small amount of ethanol as reaction solvents; reacting a precursor surface layer with Li2CO3 and nickel nitrate according to a Coriolis-Tyndall effect by taking the MnCO3 precursor obtained in the precious step as a spherical template as well as an Mn source to generate the lithium battery LiNi0.5Mn1.5O4 positive electrode material with a remarkable simple structure. The method has the characteristics of simple process, cheap raw materials, room-temperature preparation of a template material, low cost, controllability of the microstructure and size of the positive electrode material, and the like.

Description

Technical field [0001] The present invention relates to the technical field of lithium battery materials, in particular to a hollow structure lithium battery LiNi 0.5 Mn 1.5 O 4 Preparation method of positive electrode material. Background technique [0002] As a new type of green high-energy battery, lithium-ion batteries are widely used in mobile phones, cameras, and notebooks due to their high working voltage, large specific capacity, long cycle life, low self-discharge rate, no memory effect, and environmental friendliness. Portable devices such as computers. And with the application in electric vehicles, cordless power tools and military applications, higher requirements are put forward for the energy density of lithium-ion batteries, which requires the development of new cathode materials. With layered LiCoO 2 And LiNiO 2 In contrast, spinel-type lithium manganese oxide has become one of the hot spots in the research of lithium-ion battery cathode materials because of its ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘小林钟盛文丁能文张骞李之锋
Owner JIANGXI UNIV OF SCI & TECH
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