Phosphorous boron doped lithium manganese phosphate/carbon composite material and preparation method thereof

A carbon composite material, lithium manganese phosphate technology, applied in phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as low activity, improve discharge capacity, improve electrochemical response speed, and reduce material polarization Effect

Inactive Publication Date: 2015-10-28
FUDAN UNIV
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  • Summary
  • 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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  • Phosphorous boron doped lithium manganese phosphate/carbon composite material and preparation method thereof
  • Phosphorous boron doped lithium manganese phosphate/carbon composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Lithium carbonate, manganese carbonate, ammonium dihydrogen phosphate and boric acid were prepared according to the molar ratio of Li: Mn: P: B at 1: 1: 0.95: 0.05, added with 10 wt.% carbon black, mixed and ball milled for 4 hours, the powder obtained was 700 Calcined in an argon atmosphere at ℃ for 5 hours, and then cooled in the furnace to obtain a boron-doped lithium manganese phosphate / carbon composite material LiMnP 0.95 B 0.05 O 4-δ / C, figure 1 It is the XRD pattern of the material.

Embodiment 2

[0023] Lithium dihydrogen phosphate, manganese acetate and lithium borate were prepared according to the molar ratio of Li: Mn: P: B 1: 1: 0.9: 0.1, 15 wt.% sucrose was added, and the mixture was ball milled for 6 hours. The powder obtained was argon at 600 ℃ Calcined in an atmosphere for 10 hours, after cooling in the furnace, the boron-doped lithium manganese phosphate / carbon composite material LiMnP 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- The methyl pyrrolidone solvent is made into a slurry, and then coated on an aluminum foil with a thickness of 15 microns, and dried under vacuum to remove the solvent. Then use a sampler to cut a disc with a radius of 1 cm and place it in an anhydrous and oxygen-free glove box. The wafer was used as the working electrode, the metal lithium was the...

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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 specifically relates to a lithium ion battery cathode material and a preparation method thereof, and particularly relates to a boron-doped lithium manganese phosphate / 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 multifunctionality and integration of mobile devices, as well as the development of electric vehicles and photovoltaic industries, lithium-ion batteries have shown a broader Application prospects. 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 ol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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