Method for preparing nanometer ferrous phosphate lithium /carbon composite material

A lithium iron phosphate and carbon composite material technology, applied in electrode manufacturing, electrical components, battery electrodes, etc., can solve problems such as difficulty in LiNiO2 synthesis, unsafe overcharge, impossible large-capacity battery application, and structural instability. , to achieve the effect of improving electrochemical performance, excellent electrochemical performance, and inhibiting growth

Inactive Publication Date: 2009-11-18
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Among them, the commercialized cathode material LiCoO 2 Due to the lack of cobalt resources, the pollution of the environment, and its unsafe overcharging determines that it cannot be used in large-capacity batteries
For LiNi 0.3 co 0.3 mn 0.3 o 2 Also due to the limitation of cobalt resources and cannot be promoted, LiMnO 4 The structure is less stable,

Method used

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  • Method for preparing nanometer ferrous phosphate lithium /carbon composite material
  • Method for preparing nanometer ferrous phosphate lithium /carbon composite material
  • Method for preparing nanometer ferrous phosphate lithium /carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] After directly mixing ferrous sulfate, lithium dihydrogen phosphate and nickel acetate according to the molar ratio of Fe:Li:P:Ni 0.9:1:1:0.1, add 10% polyacrylamide (mass percentage relative to lithium iron phosphate ), milled in an appropriate amount of absolute ethanol at 200r / min for 10 hours, dried and then heated in a nitrogen atmosphere at a rate of 5°C / min, stayed at 200°C for 5 hours, and then heated to 500°C for 15 hour, and then cooled naturally to obtain a nanoscale lithium iron phosphate / carbon composite material.

Embodiment 2

[0024] Ferrous chloride, lithium hydroxide, phosphoric acid and chromium trioxide are directly mixed according to Fe: Li: P: Cr molar ratio 0.97: 1: 1: 0.03, then add 5% polyethylene glycol (relative to ferrous phosphate mass percentage of lithium), ball milled in an appropriate amount of acetone for 5 hours at 200r / min, and after drying, heat up in a nitrogen atmosphere at a heating rate of 5°C / min, stay at 250°C for 3 hours, and then heat up to 600°C to keep the temperature After 12 hours, it was naturally cooled to obtain a nanoscale lithium iron phosphate / carbon composite material.

Embodiment 3

[0026] After directly mixing ferrous oxalate, lithium carbonate, phosphoric acid and magnesium acetate according to the molar ratio of Fe:Li:P:Mg 0.99:1:1:0.01, add 10% polyvinyl alcohol (mass percentage relative to lithium iron phosphate) , ball milled in an appropriate amount of distilled water at 200r / min for 8 hours, after drying, heat up in a nitrogen atmosphere at a rate of 5°C / min, stay at 290°C for 5 hours, then raise the temperature to 700°C for 5 hours, and then Cool naturally to obtain nanoscale lithium iron phosphate / carbon composite material.

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Abstract

The invention belongs to energy materials, particularly relating to a method for preparing nanometer ferrous phosphate lithium /carbon composite material. In the invention, ferrous source, lithium source, phosphorus source are mixed with a small quantity of doped metal salt and organic macromolecular polymer carbon source according to certain ratio followed by the steps of ball milling, parching and calcining. High temperature sintering is carried out on the above mixture in the atmosphere of non-oxidation gas to obtain nanometer lithium iron phosphate LiMxFe(1-x)PO4/C coated with carbon and LiFe(1-x)NxPO4/C material, and the particle sizes of which are remarkably reduced and are less than 100nm. When the material is applied to battery assemble, 0.2C multiplying power discharge capacity can reach above 160mAh/g at room temperature, 1C multiplying power discharge capacity can be 140-155mAh/g, and 5C multiplying power discharge capacity is 130-150mAh/g. the initial capacity is 120-140mAh/g under the large multiplying power of 10C, and remains more than 90% through thousands of cycles, demonstrating good multiplying power and cycle properties. The invention features low cost, simple production process and fine safety. The prepared nanometer ferrous phosphate lithium /carbon composite material can be widely applied into manufacturing of convenient and fast equipment, electric vehicles and the like.

Description

technical field [0001] The invention belongs to the technical field of energy materials, in particular to a method for preparing a nanoscale lithium iron phosphate / carbon composite material. Background technique [0002] With the rapid development of society and the continuous advancement of science and technology, people have higher and higher energy requirements for portable electronic products and vehicles, especially for energy security, environmental protection and practicality. These are inseparable from the development of lithium-ion batteries. [0003] Since 1991, Sony Corporation took the lead in introducing the Li x C 6 / Li 1-x CoO 2 Since the commercialization of lithium-ion batteries, lithium-ion batteries have been widely used in portable products such as mobile phones, digital cameras, and notebook computers, and the main factor affecting the development of lithium-ion batteries is the cathode material. Among them, the commercialized cathode material LiCoO...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/58H01M4/62
CPCY02E60/12Y02E60/10
Inventor 王荣顺葛玉翠颜雪冬
Owner NORTHEAST NORMAL UNIVERSITY
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