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High-performance lithium iron phosphate cathode material and preparation method thereof

A cathode material, lithium iron phosphate technology, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve problems such as increased energy consumption and increased cost, and achieve the effects of good crystallinity, uniform distribution, and simplified preparation process

Active Publication Date: 2015-02-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many problems in the process of preparing lithium iron phosphate by high-temperature solid-state reaction method: (1) Most of them require a two-step sintering process of low-temperature pre-sintering and high-temperature sintering. 20~60h, need secondary wet ball milling, resulting in increased energy consumption and cost increase in the production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of carbon source: Nitrogenize the collected discarded cigarette filters at 800°C for 3 hours in an ammonia atmosphere, and keep the heating rate at 8°C / min to obtain nitrogen-containing carbon materials with sub-porous and micro-porous structures as carbon sources .

[0022] Lithium dihydrogen phosphate, lithium acetate, and ferrous oxalate are weighed according to the molar ratio of lithium, iron, and phosphorus in a ratio of 1:1:1, and at the same time, the above-mentioned Carbon source, ball milling with deionized water as a solvent for 2 hours, and then ball milling in an ultrafine mill for 8 hours, adding titanium oxide sol during the ball milling process, wherein the molar content of titanium is 5% of the lithium iron phosphate cathode material, after ball milling The mixture was fully dried by microwave drying process. Finally, the dried mixture was kept at 600° C. for 24 hours in a high-purity argon gas with a volume fraction of 5% hydrogen, and the...

Embodiment 2

[0024] Preparation of carbon source: Nitrogenize the collected discarded cigarette filters at 950°C for 1.5h in an ammonia atmosphere, and keep the heating rate at 2°C / min to obtain nitrogen-containing carbon with sub-porous and micro-porous structures material as a carbon source.

[0025] Lithium dihydrogen phosphate, lithium acetate, lithium carbonate, ferrous oxalate, and ferric hydroxide are weighed according to the ratio of lithium, iron, and phosphorus in a ratio of 1.03:1:1. 15% of the above-mentioned carbon source of the lithium positive electrode material is ball milled for 12 hours with a mixture of deionized water and absolute ethanol as a solvent, and then ball milled for 2 hours in an ultrafine mill, and titanium oxide sol is added during the ball milling process, wherein the molar content of titanium The content is 0.5% of the lithium iron phosphate positive electrode material, and the ball-milled mixture is fully dried by a microwave drying process. Finally, th...

Embodiment 3

[0027] Preparation of carbon source: Nitrogenize the collected discarded cigarette filters at 900°C for 2 hours in an ammonia atmosphere, and keep the heating rate at 5°C / min to obtain nitrogen-containing carbon materials with sub-porous and micro-porous structures as carbon sources .

[0028]Lithium dihydrogen phosphate, lithium carbonate and ferrous oxalate are weighed according to the molar ratio of lithium, iron and phosphorus in a ratio of 1:1:1. Carbon source, using a mixture of deionized water and n-butanol as a solvent for ball milling for 6 hours, then ball milling for 4 hours in an ultrafine mill, adding titanium oxide sol during the ball milling process, wherein the molar content of titanium is 3% of the lithium iron phosphate cathode material %, the ball-milled mixture is fully dried by a microwave drying process. Finally, the dried mixture was kept at 700° C. for 10 h in high-purity argon, and then cooled naturally in a furnace to obtain a lithium iron phosphate ...

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Abstract

The invention provides a high-performance lithium iron phosphate cathode material for a lithium ion battery. During the preparation process, a carbon source used is a product obtained after nitrogen treatment of cigarette filters in ammonia gas. The invention also provides a preparation method of the lithium iron phosphate cathode material. The preparation method comprises the following steps: a product obtained after nitrogen treatment of cigarette filters in ammonia gas is firstly used as a carbon source of the lithium iron phosphate cathode material; then, an iron source, a lithium source, a phosphorus source and the above carbon source successively undergo uniform mixing, ball milling, drying, crushing and roasting so as to prepare the lithium iron phosphate cathode material. The lithium iron phosphate cathode material has outstanding merits as follows: the preparation technology is simple; cost is low; and the material is easy for large-scale production. As the product obtained after nitrogen treatment of waste cigarette filters in ammonia gas is used as the carbon source, resources are saved to realize cyclic utilization of wastes, and the lithium iron phosphate cathode material with high specific capacity and good rate capability also can be obtained. The lithium iron phosphate cathode material has important practical application value.

Description

technical field [0001] The invention relates to a high-performance lithium iron phosphate cathode material and a preparation method thereof, in particular introducing a new type of carbon source through the recycling method of waste, and adopting a low energy consumption, environmental protection, simple preparation process and easy large-scale production A method for preparing a lithium iron phosphate cathode material for a lithium ion battery by a one-step process. It belongs to the field of new energy materials. Background technique [0002] The global ecological and energy crisis is becoming more and more serious, and the research and development and application of new lithium-ion batteries and related materials are favored. Among them, the lithium iron phosphate cathode material for lithium-ion batteries has excellent electrochemical performance, stable charging and discharging platform, High voltage, high energy density, good cycle performance, small self-discharge, n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62C01B25/45
CPCC01B25/45H01M4/139H01M4/5825H01M10/0525Y02E60/10
Inventor 徐宇兴高晓勇
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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