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Ellipsoidal porous-structured lithium manganate or nickel lithium manganate positive electrode material and preparation method thereof

A technology of lithium nickel manganese oxide and positive electrode materials, applied in the field of new energy materials, can solve the problems of large specific surface area, achieve the effect of reducing lattice constant, suppressing deformation, and improving rate performance

Inactive Publication Date: 2013-10-23
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the electrochemical performance of lithium manganate is also affected by its particle size: microscopically speaking, the smaller the particle, The shorter the migration path, the shorter the diffusion time, which is more conducive to the improvement of the rate performance of the material; but the smaller the particle size and the larger the specific surface area, the greater the capacity fading caused by the dissolution of manganese in the electrolyte

Method used

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  • Ellipsoidal porous-structured lithium manganate or nickel lithium manganate positive electrode material and preparation method thereof
  • Ellipsoidal porous-structured lithium manganate or nickel lithium manganate positive electrode material and preparation method thereof
  • Ellipsoidal porous-structured lithium manganate or nickel lithium manganate positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0020] The ellipsoidal manganese carbonate was calcined at 350°C for 6 hours to obtain ellipsoidal manganese dioxide. Mix and dissolve 1.74g manganese dioxide and 0.44g lithium hydroxide monohydrate in 30g ethanol, stir evenly at room temperature, dry the alcohol after volatilization, and roast at 700°C for 20 hours to obtain porous ellipsoidal lithium manganate. After testing, the lithium manganate is porous ellipsoid, with a small amount of lumps, and the particle size is between 0.2 and 8 microns. Test results as a positive electrode material: Under the test conditions of 1C rate charge and 5C rate discharge, the initial discharge capacity is 60.3 mAh / g, and the capacity retention rate after 1000 cycles is 88.2%.

Embodiment 2

[0022] The ellipsoidal manganese carbonate was calcined at 300°C for 8 hours to obtain ellipsoidal manganese dioxide. Mix and dissolve 1.74g manganese dioxide and 0.44g lithium hydroxide monohydrate in 20g ethanol, stir evenly at room temperature with magnetic force, dry the alcohol after volatilization, and roast at 750°C for 10 hours to obtain porous ellipsoidal lithium manganate. After testing, the porous ellipsoidal lithium manganese oxide has a uniform shape and an average particle size of 3 microns. Test results as a positive electrode material: Under the test conditions of 1C rate charge and 5C rate discharge, the initial discharge capacity is 72.9 mAh / g, and the capacity retention rate after 500 cycles is 78.5%.

Embodiment 3

[0024] Roast rice-shaped manganese carbonate at 400°C for 4 hours to obtain ellipsoidal manganese dioxide. Mix and dissolve 1.74g manganese dioxide and 0.44g lithium hydroxide monohydrate in 20g ethanol, stir evenly at room temperature with magnetic force, dry the alcohol after volatilization, and roast at 800°C for 8 hours to obtain porous ellipsoidal lithium manganate. After testing, the lithium manganese oxide has a porous ellipsoid shape, uniform particle size distribution, and a particle size between 0.5 and 5 microns. As a positive electrode material test results: under the test conditions of 0.1C~20C rate charge and discharge, the 0.2C rate discharge capacity is 110.7 mAh / g, the 1C rate discharge capacity is 99.8 mAh / g, and the 5C rate discharge capacity is 84.8 mAh / g. The 10C rate discharge capacity is 70.3 mAh / g.

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Abstract

The invention discloses lithium ion battery positive electrode material and a preparation method of the material. The method comprises the steps that: (1) ellipsoidal manganese carbonate is roasted for 4-8h under a temperature of 300-400 DEG C, such that ellipsoidal manganese dioxide is obtained; (2) a lithium source or a mixture of a lithium source and a nickel source is dissolved into excessive ethanol; the mixture is added into the ellipsoidal manganese dioxide obtained in the previous step; the mixture is well mixed; the mixture is dried when ethanol is volatized; and the product is roasted for 8-20h under a temperature of 700-800 DEG C, such that ellipsoidal porous-structured lithium manganate or nickel lithium manganate is obtained. In the step (2), a molar ratio of the lithium source to the ellipsoidal manganese dioxide is that: Li:Mn=1-1.1:2, and the molar ratio of the mixture of the lithium source and the nickel source to the ellipsoidal manganese dioxide is that: Li:Ni:Mn=1-1.1:0.5:1.5. When the material provided by the invention is used as a lithium ion battery positive electrode material, performance better than that of spherical Lithium manganate can be provided.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a lithium manganate or lithium nickel manganese oxide positive electrode material with an ellipsoidal porous structure and a preparation method. Background technique [0002] With the rapid development of the automobile industry and the gradual depletion of petroleum resources, the application of lithium-ion batteries in the field of power batteries has received more and more attention. Lithium-ion power batteries have put forward higher requirements for cathode materials. Spinel lithium manganese oxide (LiMn 2 o 4 ) has the advantages of rich resources, simple synthesis, safety and environmental protection, and is one of the mainstream cathode materials for lithium-ion power batteries. However, the disadvantages of poor charge-discharge cycle performance and fast capacity decay limit its development in power batteries. The main factors affecting its cycle performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 邓健秋蔚晨潘进姚青荣王仲民周怀营
Owner GUILIN UNIV OF ELECTRONIC TECH
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