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New positive material and preparation method thereof

A compound and iron source technology, applied in battery electrodes, electrical components, circuits, etc.

Inactive Publication Date: 2012-04-25
SUZHOU GOLDEN CROWN NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the LiFePO4 positive electrode material prepared by the traditional method, impurities such as iron phosphate, lithium phosphate, iron oxide, lithium oxide, iron carbonate, and lithium carbonate will be produced during the manufacturing process, so the theoretical capacity ratio of the powder is 180 mAh / grams (mAh / g), but the actual capacitance value is only 90 to 110 milliampere hours / gram (mAh / g)

Method used

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  • New positive material and preparation method thereof
  • New positive material and preparation method thereof
  • New positive material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 2

[0032] 2. Embodiment 2: do not add magnesium carbonate and with the preparation method of vacuum sintering.

[0033] 2.1 Raw materials:

[0034] 2.1.1 Ammonium dihydrogen phosphate (NH 2 PO 4 ), 39.8 grams

[0035] 2.1.2 Ferrous oxalate (FeC 2 o 4 ), 97.5 grams

[0036] 2.1.3 Lithium carbonate (Li 2 CO3 ), 8.0 g

[0037] 2.2 preparation method, the embodiment of vacuum sintering: (as figure 1 )

[0038] 2.2.1 In the first mixing step, the ammonium dihydrogen phosphate, ferrous oxalate, and lithium carbonate described in item 2.1 are mixed and ground into a uniform powder mixture.

[0039] 2.2.2 In the first sintering step, heat the raw materials in item 2.2.1 at 250 degrees Celsius for 2 hours in a vacuum environment, separate the liquid and gas impurities generated during the sintering process, and remove oxalic acid and carbonic acid, leaving behind phosphoric acid;

[0040] 2.2.3 In the second sintering step, the product of item 2.2.2 is sintered at 500 degrees ...

Embodiment 3

[0044] 3. Embodiment 3: adding magnesium carbonate and not with the preparation method of vacuum sintering.

[0045] 3.1 Raw materials:

[0046] 3.1.1 Ammonium dihydrogen phosphate (NH 2 PO 4 ), 39.8 grams

[0047] 3.1.2 Ferrous oxalate (FeC 2 o 4 ), 97.5 g

[0048] 3.1.3 Lithium carbonate (Li 2 CO 3 ), 8.0 g

[0049] 3.1.4 Magnesium carbonate (MgCO 3 ), 0.5 g

[0050] 3.2 Preparation method, the embodiment of adding intermediate destroyer: (such as figure 2 )

[0051] 3.2.1 In the first mixing step, the ammonium dihydrogen phosphate, ferrous oxalate, and lithium carbonate described in item 3.1 are mixed and ground into a powder-like homogeneous mixture;

[0052] 3.2.2 In the first sintering step, heat the raw materials in item 3.2.1 under the protection of nitrogen at 300 degrees Celsius for 2 hours, and separate the liquid and gas impurities generated during the sintering process by changing nitrogen every 30 minutes;

[0053] 3.2.3 In the second mixing step,...

Embodiment 7

[0096] Embodiment 7: the preparation method of adding magnesium carbonate and sintering with vacuum.

[0097] 7.1 Raw materials:

[0098] 7.1.1 Ammonium dihydrogen phosphate (NH 2 PO 4 ), 39.8 g

[0099] 7.1.2 Ferrous oxalate (FeC 2 o 4 ), 97.5 g

[0100] 7.1.3 Lithium carbonate (Li 2 CO 3 ), 8.0 g

[0101] 7.1.4 Magnesium carbonate (MgCO 3 ), 0.5 g

[0102] 7.3 Preparation method, example of vacuum sintering:

[0103] 7.2.1 In the first mixing step, mix and grind the ammonium dihydrogen phosphate, ferrous oxalate, lithium carbonate and magnesium carbonate described in Item 7.1 into a uniform powder mixture.

[0104] 7.2.2 In the first sintering step, heat the raw materials in item 7.2.1 in a vacuum environment at 300 degrees Celsius for 2 hours, separate and remove the liquid and gas impurities generated during the sintering process;

[0105] 7.2.3 In the second sintering step, the product in item 7.2.2 is sintered at 500 degrees Celsius for 4 hours in a vacuum ...

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Abstract

The invention provides a preparation method of a new positive material, comprising the following steps of: (1) mixing compounds providing an iron source, a lithium source, a phosphorus source and an oxygen source; and (2) carrying out sintering on the mixture, wherein the decomposition temperature of the compounds providing the iron source and the lithium source is lower than that of the compounds providing the phosphorus source and / or the oxygen source. By adoption of the positive material produced by the method, for example, LiFePO4 powder, the purity is between 90% and 95%, and the gram-capacity ratio is 150-170mAh / g.

Description

technical field [0001] The present invention is related to battery positive electrode materials, in particular, related to the positive electrode materials used in lithium ion batteries of electric tools, consumer electronics and electric vehicles, such as lithium ferrous phosphate (chemical formula: LiFePO4). Background technique [0002] Lithium-ion battery refers to a rechargeable battery in which lithium ions (Li+) are intercalated and deintercalated into positive and negative electrode materials. The positive electrode generally uses lithium intercalation compounds, such as lithium cobaltate (LiCoO2) Lithium nickelate (LiNiO2) and lithium manganate (LiMn2O4) with spinel crystal structure. When charging, Li+ is deintercalated from the positive electrode, embedded into the negative electrode through the electrolyte, and the electronic compensation charge is supplied to the negative electrode from the external circuit; the opposite is true during discharge, Li+ is deinter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12H01M4/5825Y02E60/10
Inventor 黄仁治
Owner SUZHOU GOLDEN CROWN NEW ENERGY