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Phosphate potential boron-doped manganese phosphate lithium / carbon composite materials and preparation method thereof

A technology of carbon composite materials and lithium manganese phosphate, applied in the direction of phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of low activity, improve discharge capacity, reduce material polarization, and increase electrochemical response speed Effect

Inactive Publication Date: 2013-02-13
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low activity of the current lithium manganese phosphate cathode material, propose a phosphorus-position boron-doped lithium manganese phosphate / carbon composite material as the cathode material of lithium ion batteries, and provide a preparation method of the composite material

Method used

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  • Phosphate potential boron-doped manganese phosphate lithium / carbon composite materials and preparation method thereof
  • Phosphate potential boron-doped manganese phosphate lithium / carbon composite materials and preparation method thereof

Examples

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Effect test

Embodiment 1

[0021] Lithium carbonate, manganese carbonate, ammonium dihydrogen phosphate and boric acid are prepared by Li: Mn: P: B molar ratio 1: 1: 0.95: 0.05, add 10 wt.% carbon black, mix ball mill for 4 hours, the powder obtained is at 700 ℃ under argon atmosphere for 5 hours, and after cooling in the furnace, the boron-doped lithium manganese phosphate / carbon composite material LiMnP was obtained. 0.95 B 0.05 o 4-δ / C, figure 1 is the XRD pattern of the material.

Embodiment 2

[0023] Lithium dihydrogen phosphate, manganese acetate and lithium borate were prepared according to Li: Mn: P: B molar ratio 1: 1: 0.9 : 0.1, 15 wt.% sucrose was added, mixed and ball milled for 6 hours, and the obtained powder was heated at 600 °C under argon Calcined under the atmosphere for 10 hours, and after cooling with the furnace, the boron-doped lithium manganese phosphate / carbon composite material LiMnP was obtained. 0.9 B 0.１ o 4-δ / C. The electrochemical performance test method is as follows: mix the obtained composite material, binder (polyvinylidene fluoride), and conductive agent (acetylene black) in a mass ratio of 9:1:1, and add 10 wt.% N- Methylpyrrolidone solvent, into a slurry, and then coated on an aluminum foil with a thickness of 15 μm, dried under vacuum to remove the solvent. Then use a sampler to cut out a disc with a radius of 1 cm, and put it into a water-free and oxygen-free glove box. The disc was used as the working electrode, metal lithium ...

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Abstract

The invention belongs to the technical field of electrochemical power sources and discloses boron-doped manganese phosphate lithium / carbon composite materials and a preparation method thereof. The preparation method of the boron-doped manganese phosphate lithium / the carbon composite materials is characterized in that boron compounds, a lithium source, a manganese source, a phosphorus source and carbon source compounds are mixed uniformly through ball-milling and calcined for one shot under inert atmosphere, and therefore boron-doped manganese phosphate lithium material can be obtained. The general formula of the preparation method of the boron-doped manganese phosphate lithium / the carbon composite materials is LiMnP1-xBxO4-delta / C. Doped boron improves electrochemical performance of manganese phosphate lithium. The boron-doped manganese phosphate lithium / the carbon composite materials can be used as lithium-ion secondary battery anode materials.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a lithium ion battery cathode material and a preparation method thereof, in particular to a boron-doped manganese phosphate lithium / carbon cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in portable devices such as mobile phones, notebook computers, and digital electronic products. With the increase in multi-functionality and integration of mobile devices, and the development of electric vehicles and photovoltaic industries, lithium-ion batteries have shown broader potential. Application prospect. The safety and electrochemical performance of lithium-ion batteries largely depend on the cathode material. In the current commercial lithium-ion batteries, lithium cobalt oxide (LiCoO 2 ), spinel lithium manganate (LiMn 2 o 4 ), ternary materials (nickel-cobalt-manganese-lithium) and o...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01B25/45H01M4/62H01M4/136H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 胡成林易惠华王法星肖时英吴宇平
Owner FUDAN UNIV
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