Multielement-doped lithium iron phosphate positive electrode material and preparation method thereof

A technology of lithium iron phosphate and positive electrode materials, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as poor conductivity and low density, and achieve high specific capacity, low pollution, and uniform composition

Inactive Publication Date: 2010-08-11
QUFU ENERGY
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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 provide a multi-element doped lithium iron phosphate cathode material and a preparation method thereof for the disadvantages of low density and poor conductivity in the above method

Method used

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  • Multielement-doped lithium iron phosphate positive electrode material and preparation method thereof
  • Multielement-doped lithium iron phosphate positive electrode material and preparation method thereof
  • Multielement-doped lithium iron phosphate positive electrode material and preparation method thereof

Examples

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Embodiment 1

[0018] High-purity lithium carbonate Li 2 CO 3 366.3g, cerium oxide CeO 2 17.2g, ferrous oxalate Fe(C 2 o 4 )·2H 2 O1773g, ammonium dihydrogen phosphate NH 4 h 2 PO 4 Add 1150g and 99.2g of glucose into a high-speed inclined grinding mixer, and use polyurethane balls as the ball milling medium to mix for 6h, and then raise the temperature to 600°C at a rate of 5°C / min under a nitrogen atmosphere of 0.3 liters / min. The temperature is kept for 10 hours, and the temperature is rapidly lowered to room temperature with the cooling water jacket, and the intermediate is obtained after crushing and grinding.

[0019] Then add niobium pentoxide Nb 2 o 5 13.3 g, 2 g of magnesium oxide MgO, and 99.2 g of glucose were mixed in a high-speed inclined grinding mixer with polyurethane balls as the ball milling medium for 6 hours, and then heated at a rate of 5°C / min under a nitrogen atmosphere of 0.3 liters / min. Raise to 800°C, keep at this temperature for 18 hours, quickly drop...

Embodiment 2

[0021] High-purity lithium carbonate Li 2 CO 3 366.3g, lanthanum oxide La 2 o 3 16.3g, ferrous oxalate Fe(C2 o 4 )·2H 2 O 1764g, diammonium hydrogen phosphate (NH 4 ) 2 HPO 4 1320g and 104.1g of sucrose were added to a high-speed inclined grinding mixer, and polyurethane balls were used as the ball milling medium to mix for 6 hours, and then under a nitrogen atmosphere of 0.3 liters / min, the temperature was raised to 700°C at a rate of 5°C / min. The temperature was kept for 10 hours, and quickly dropped to room temperature with the cooling water jacket, and the intermediate was obtained after crushing and grinding, and then niobium pentoxide Nb was added 2 o 5 13.3g, magnesium oxide MgO 2g, manganese dioxide MnO 2 4.35g, 104.1g of glucose, in a high-speed inclined grinding mixer, mixed with polyurethane balls as the ball milling medium for 6h, and then heated up to 800°C at a rate of 5°C / min under a nitrogen atmosphere of 0.3 liters / min. Keep it warm at this tempe...

Embodiment 3

[0023] High-purity lithium carbonate Li 2 CO 3 366.3g, lanthanum oxide La 2 o 3 16.3g, ferric oxide Fe 2 o 3 1568g, ammonium dihydrogen phosphate NH 4 h 2 PO 4 1150g and 310.4g of carbon black were added to a high-speed inclined grinding mixer, and polyurethane balls were used as the ball milling medium for 6 hours, and then under a nitrogen atmosphere of 0.3 liters / min, the temperature was raised to 750°C at a rate of 5°C / min. Keep this temperature for 10 hours, and quickly drop to room temperature with the cooling water jacket. After crushing and grinding, the intermediate is obtained, and then niobium pentoxide Nb is added. 2 o 5 13.3g, magnesium oxide MgO 2g, manganese dioxide MnO 2 4.35g, 155.2g of carbon black, in a high-speed inclined milling mixer, mixed with polyurethane balls as the ball milling medium for 6h, and then raised to 800°C at a rate of 5°C / min under a nitrogen atmosphere of 0.3 liters / min , kept at this temperature for 18 hours, and quickly ...

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Abstract

The invention discloses a multielement-doped lithium iron phosphate positive electrode material and a preparation method thereof. The general formula of the multielement-doped lithium iron phosphate positive electrode material is Li1-xAxFe1-y-zNbyMzPO4, wherein x, y and z are more than zero and not more than 0.1. The preparation method comprises the following steps: mixing lithium source, iron source, phosphorus source, compound of A and carbon source, roasting at 400-800 DEG C, then quickly reducing the temperature to room temperature, crushing, grinding to obtain an intermediate, then mixing the intermediate with niobium compound, compound of M and carbon source, roasting at 400-850 DEG C, then quickly reducing the temperature to room temperature, grinding, and grading to obtain the product. The preparation method of the invention can obviously increase the tap density of the material; and the material can have higher specific capacity and volume specific capacity and excellent cycle performance, meanwhile the material is applicable to industrialized stable production and has wide application prospect in the battery positive electrode material field for energy sources.

Description

technical field [0001] The invention relates to a multi-element doped lithium iron phosphate positive electrode material used as a common secondary lithium ion battery or power energy source and a preparation method thereof, belonging to the technical field of preparation of electrochemical power source materials. Background technique [0002] Lithium-ion battery is a new type of green high-energy rechargeable battery that appeared in the early 1990s. It has many advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. It is widely used in mobile Telephones, notebook computers, electric tools, electronic instruments, military machinery and other fields also have good application prospects in electric vehicles, and have become the focus of research and development in countries all over the world. Cathode materials are an important part of lithium-ion batteries, research and deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 商士波赛喜雅勒图李安
Owner QUFU ENERGY
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