Preparation method for lithium iron phosphate/carbon composite positive material with high multiplying power

A technology of lithium iron phosphate and positive electrode materials, which is applied in the direction of phosphorus compounds, chemical instruments and methods, battery electrodes, etc., can solve the problems of low purity, low density, and unstable quality of iron salts, etc., so as to reduce production costs and reduce The effect of environmental stress

Active Publication Date: 2015-07-01
山东鑫动能锂电科技有限公司
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Problems solved by technology

Among them, the iron phosphate process route is limited due...

Method used

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  • Preparation method for lithium iron phosphate/carbon composite positive material with high multiplying power
  • Preparation method for lithium iron phosphate/carbon composite positive material with high multiplying power
  • Preparation method for lithium iron phosphate/carbon composite positive material with high multiplying power

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[0021] Implementation example 1 :

[0022] in N 2 Under protection, FeSO with a molar concentration of 1.3mol / L after purification 4 Solution 120mL was added to 80mL molar concentration of 1.3mol / L (NH 4 ) 2 HPO 4 in, while to NH 4 h 2 PO 4 Add 0.1g dispersant PVP into the solution, add 1:3 NH under stirring 3 ·H 2 O, adjust the pH value to 7.0, after 1 hour of reaction, Fe 3 (PO 4 ) 2 ·8H 2 O precipitation. After filtration and washing, the Fe 3 (PO 4 ) 2 ·8H 2 O was transferred to a beaker, 0.25mol phosphoric acid was added, and H was added after 1 hour of reaction 2 o 2 About 2.78g, with NH 3 .H 2 O (1:3) adjusts the pH of the system to 2.0, and after aging for 3 hours, the precipitate is filtered and dried to obtain FePO 4 2H 2 O powder.

[0023] Weigh FePO 4 2H 2 O powder 10.0g, analytically pure LiOH·H 2 O 2.35g, analytically pure glucose 1.0g, add 10ml of distilled water, ball mill for 2 hours, then dry at 100°C for 8 hours and place in N 2 ...

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Abstract

The invention relates to a preparation method for a lithium iron phosphate/carbon composite positive material with high multiplying power. The preparation method comprises the following steps: (1) stirring and mixing a phosphor source solution with an iron source solution, adding a dispersing agent, and controlling the pH value of the reaction to generate ferrous phosphate precipitate; (2) adding an oxidant after supplementing a phosphor source into the obtained ferrous phosphate in a phosphor-iron ratio of (1:1) to (7:1), and regulating the pH value to synthesize iron phosphate; (3) mixing the iron phosphate with a lithium source and a carbon source in a chemical metering ratio, carrying out ball milling, drying and roasting to obtain a sheet-layer lithium iron phosphate/carbon composite positive material with high multiplying power. The positive material has good electrochemical performances including the specific discharge capacities of 0.2C, 1C and 10C are respectively 162mAh/g, 158mAh/g and 142mAh/g. The positive material is low in cost, good in technological reproducibility, excellent in electrochemical performance, and suitable for being used as a battery positive material of large mobile equipment with high multiplying power of an electric vehicle, and the like.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a preparation method of a high-rate lithium iron phosphate / carbon composite cathode material. Background technique [0002] In the National Thirteenth Five-Year Plan, vigorously developing new energy materials and new energy-saving technologies is an important strategy for energy-saving, emission-reduction and consumption-reduction. Among them, great policy preference is also given to all pure electric vehicles and some hybrid electric vehicle markets. It has brought a thriving spring for China's lithium battery industry. Among them, from the perspective of the material field, lithium-ion battery cathode materials have won incomparable favor, which has not only brought good news and pointed out the direction to all cathode material researchers, but also put forward higher requirements, that is, "fast charging discharge", "long battery life", "high power ...

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Application Information

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IPC IPC(8): C01B25/45C01B31/02H01M4/58H01M4/62
CPCY02E60/10
Inventor 刘恒张云吴昊刘学宝
Owner 山东鑫动能锂电科技有限公司
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