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Composite microsphere negative electrode material with core-shell structure, preparation method and application of composite microsphere negative electrode material

A technology of negative electrode material and core-shell structure, which is applied in the field of Li1.1V0.9O2/C microsphere composite negative electrode material and its preparation, can solve the problems of initial cycle capacity loss, restriction of practical progress, high potential platform, etc., and improve the structure mode , low cost, easy to operate

Inactive Publication Date: 2017-02-15
HUNAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a potential development space for lithium transition metal oxides to be used as anode materials for lithium-ion batteries. The research on lithium-transition metal oxides for lithium-ion battery anode materials includes LiSnO, LiTiO, LiVO and other systems, among which Sn oxide has the highest capacity, but The serious loss of initial cycle capacity and other problems restrict its practical progress. Li 4 Ti 5 o 12 It is a well-known "zero-variable material" with a very stable structure, and it has also received a lot of attention at present, but its high potential platform limits its use in some fields

Method used

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  • Composite microsphere negative electrode material with core-shell structure, preparation method and application of composite microsphere negative electrode material
  • Composite microsphere negative electrode material with core-shell structure, preparation method and application of composite microsphere negative electrode material
  • Composite microsphere negative electrode material with core-shell structure, preparation method and application of composite microsphere negative electrode material

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preparation example Construction

[0027] Li with core-shell structure in the present invention 1.1 V 0.9 o 2 The preparation method of / C microsphere composite negative electrode material mainly comprises the following steps:

[0028] The method comprises the following steps: dissolving a lithium source and a vanadium source with a molar ratio of 1.1:0.9 according to the element Li:V, and an auxiliary agent in absolute ethanol, and then grinding; taking out the gelatinous mixture obtained by grinding and putting it into an open In the container, the precursor is obtained after evaporation and drying; the precursor is sequentially subjected to low-temperature carbonization and high-temperature synthesis in an inert or reducing atmosphere to obtain the Li with core-shell structure. 1.1 V 0.9 o 2 / C microsphere composite anode material.

[0029] more specific:

[0030] S1. Weigh and mix the lithium source and vanadium source according to the element Li:V molar ratio of 1.1:0.9, dissolve the lithium vanadium...

Embodiment 1

[0036] Li with a core-shell structure 1.1 V 0.9 o 2 The preparation method of / C microsphere composite negative electrode material comprises the following steps:

[0037] The synthetic raw material lithium vanadium mixture (CH 3 COOLi, V 2 o 3 ) and polyvinyl alcohol weigh 40 grams of the total mass according to the mass ratio of 80:20, and the lithium vanadium mixture is Li: CH with a V molar ratio of 1.1:0.9 3 COOLi, V 2 o 3 32 grams of the mixture was dissolved in 40 milliliters of absolute ethanol, and 8 grams of polyvinyl alcohol was added to completely disperse the reactant in ethanol. After ball milling on a planetary ball mill at a speed of 300 rpm for 4 hours, a gel-like mixture was obtained. The gel-like mixture was placed in an open glass dish, evaporated and dried at 80° C. for 48 hours to obtain a precursor. Then, the precursor was carbonized at a low temperature of 500°C for 3 hours in an argon atmosphere, then synthesized at a high temperature of 1050°C ...

Embodiment 2

[0041] Li with a core-shell structure 1.1 V 0.9 o 2 The preparation method of / C microsphere composite negative electrode material comprises the following steps:

[0042] The synthetic raw material lithium vanadium mixture (CH 3 COOLi, V 2 o 5 ) and polyvinyl alcohol weigh 40 grams of the total mass according to the mass ratio of 80:20, and the lithium vanadium mixture is Li: CH with a V molar ratio of 1.1:0.9 3 COOLi, V 2 o 5 Mixture 32 grams, be dissolved in the dehydrated alcohol of 40 milliliters, and add polyvinyl alcohol 8 grams, make reactant be completely dispersed in ethanol, obtain colloidal mixture after 4 hours with the rotating speed ball mill of 300 rev / mins on the planetary ball mill, The gel-like mixture was placed in an open glass dish, evaporated and dried at 80°C for 36 hours to obtain the precursor. Then the precursor was carbonized at a low temperature of 600°C for 2 hours in an argon atmosphere, then synthesized at a high temperature of 1100°C for...

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Abstract

The invention relates to the technical field of composite negative materials for batteries and discloses a composite microsphere (Li1.1V0.9O2 / C) negative electrode material with a core-shell structure and a preparation method and an application of the composite microsphere negative electrode material. Li1.1V0.9O2 microspheres are utilized as core bodies for the composite microsphere negative electrode material, amorphous carbon is utilized as a matrix of a shell layer, and nanoscale Li1.1V0.9O2 granules are uniformly distributed in the matrix in an embedded manner. The preparation method includes the steps of dissolving lithium resources, vanadium resources and an adjuvant in absolute ethyl alcohol, and grinding; taking out a colloidal mixture obtaining from grinding, placing the colloidal mixture in an open container, and evaporating and drying to obtain a precursor; subjecting the precursor to low-temperature carbonization and high-temperature composition sequentially in an inert or reducing atmosphere so as to obtain the composite microsphere (Li1.1V0.9O2 / C) negative electrode material, wherein, the molar ratio of the lithium resources to vanadium resources (Li to V) is 1.1:0.9. When the composite negative material is charged or discharged by the electric current density of 30mA / g, the first discharge capacity at the room temperature is larger than 900mAh / g, the first charge and discharge efficiencies are larger than 85%, and the capacity retention ratio remains above 90% after 500 times of cycles.

Description

technical field [0001] The invention relates to the technical field of battery negative electrode composite materials, in particular to a lithium battery with a core-shell structure 1.1 V 0.9 o 2 / C microsphere composite negative electrode material and its preparation method and application. Background technique [0002] Lithium-ion battery, as a new type of green battery, has been gradually replacing the traditional secondary batteries due to its advantages of high working voltage, light weight, large specific energy, small self-discharge rate, long cycle life, no memory effect, and no environmental pollution. The position of secondary batteries such as lead-acid batteries, nickel-chromium batteries, and nickel-hydrogen batteries has become an ideal power source for small and lightweight electronic devices such as cameras, mobile phones, notebook computers, and portable measuring instruments, as well as environmentally friendly electric vehicles. Promoting the developmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M4/131H01M10/0525
CPCH01M4/131H01M4/362H01M4/485H01M4/628H01M10/0525Y02E60/10
Inventor 陈晗向楷雄周伟朱裔荣陈宪宏
Owner HUNAN UNIV OF TECH
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