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Lithium ion battery composite cathode material and preparation method thereof

A composite positive electrode material and lithium-ion battery technology, which is applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as unsuitable for charging and discharging, reduced electron mobility, and low electronic conductivity

Inactive Publication Date: 2010-02-03
杭州海孚新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure has a special three-dimensional ion channel, and lithium ions can be deintercalated well; but in Li 3 V 2 (PO 4 ) 3 Among them, due to the crystal structure, the metal ions are far apart, which reduces the mobility of electrons in the material to a certain extent, resulting in low electronic conductivity of the material, which is not suitable for charging and discharging under high current.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] According to the stoichiometric ratio of 9:6:3:2, the raw material FePO 4 , Li 2 CO 3 , NH 4 h 2 PO 4 and NH 4 VO 3 Mix, add petroleum coke that accounts for 15% of raw material quality and pour into the agate tank (the ratio of ball to material is 15:1), then add 15ml of acetone and ball mill for 10h on the planetary ball mill, the ball mill speed is set to 350rpm. The raw materials are taken out and dried, put into a tube furnace, and calcined at 650°C for 8 hours in an argon atmosphere (air flow rate of 80ml / min). 9LiFePO 4 · Li 3 V 2 (PO 4 ) 3 / C composite cathode material.

[0014] The 9LiFePO of the prepared lithium-ion battery 4 · Li 3 V 2 (PO 4 ) 3 / C composite positive electrode material powder is used as the electrode active material, mixed with the binder polyvinylidene fluoride (PVDF) and conductive carbon black in a ratio of 91:6:3, added deionized water and stirred evenly to form a paste, and evenly coated on Aluminum foil surface, and th...

Embodiment 2

[0017] According to the stoichiometric ratio of 9:6:3:2, the raw material FePO 4 , Li 2 CO 3 , NH 4 h 2 PO 4 and NH 4 VO 3 Mix, add the petroleum coke that accounts for 20% of raw material mass and pour into the agate tank (the ratio of ball to material is 15:1), then add 15ml of acetone and ball mill for 10h on the planetary ball mill, the speed of ball mill is set to 350rpm. The raw materials are taken out and dried, put into a tube furnace, and calcined at 650°C for 8 hours in an argon atmosphere (air flow rate of 80ml / min). % 9LiFePO 4 · Li 3 V 2 (PO 4 ) 3 / C composite cathode material.

[0018] The 9LiFePO of the prepared lithium-ion battery 4 · Li 3 V 2 (PO 4 )3 / C composite positive electrode material powder is used as the electrode active material, mixed with the binder polyvinylidene fluoride (PVDF) and conductive carbon black in a ratio of 91:6:3, added deionized water and stirred evenly to form a paste, and evenly coated on Aluminum foil surface, an...

Embodiment 3

[0021] According to the stoichiometric ratio of 9:6:3:2, the raw material FePO 4 , Li 2 CO 3 , NH 4 h 2 PO 4 and NH 4 VO 3 Mixing, adding petroleum coke accounting for 25% of the raw material and pouring into an agate jar (the ball-to-material ratio is 15:1), then adding 15ml of acetone and ball milling on a planetary ball mill for 10 hours, the ball mill speed is set to 350rpm. The raw materials are taken out and dried, put into a tube furnace, and calcined at 650°C for 8 hours in an argon atmosphere (air flow rate of 80ml / min). % 9LiFePO 4 · Li 3 V 2 (PO 4 ) 3 / C composite cathode material.

[0022] The 9LiFePO of the prepared lithium-ion battery 4 · Li 3 V 2 (PO 4 ) 3 / C composite positive electrode material powder is used as the electrode active material, mixed with the binder polyvinylidene fluoride (PVDF) and conductive carbon black in a ratio of 91:6:3, added deionized water and stirred evenly to form a paste, and evenly coated on Aluminum foil surface...

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Abstract

The invention relates to a lithium ion battery composite cathode material which is characterized by being prepared from powder which is formed by uniformly coating amorphous carbon on the surfaces ofin situ composite Li3V2(PO4)3 and LiFePO4, wherein the powder contains the components in percentage by weight: 75.0-74.0 percent of LiFePO4, 21.8-21.8 percent of Li3V2(PO4)3 and 2.3-4.8 percent of amorphous carbon. A preparation process of the composite cathode material adopts a carbothermic reduction solid phase sintering method which comprises the following steps: mixing raw materials of FePO4,Li2CO3, NH4H2PO4 and NH4VO3 according to a stoichiometric ratio; adding petroleum coke accounting for 15-25 percent of the total weight of the raw materials; and after adding acetone to ball mill andmix the raw materials on a ball milling machine, and calcining the raw materials in argon atmosphere at 600-700 DEG C for 8-12 hours. When used as a cathode of a lithium ion battery, the composite cathode material has the advantages of simple preparation method, high charge and discharge capacity, good performance of high multiplying power charge and discharge, good cyclical stability, and the like.

Description

technical field [0001] The invention relates to a lithium ion battery composite cathode material and a preparation method thereof. Background technique [0002] Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high platform voltage (about 3.2-3.7V), high energy density, and no memory effect. They are widely used in mobile phones, cameras, notebook computers, and portable appliances, especially It is LiFePO with olivine structure 4 Lithium-ion batteries with positive electrode materials are rich in electrode material resources, environmentally friendly, low in price, and stable in discharge platform (3.45V, vs. Li / Li + ), good cycle performance and high overcharge safety, it is very suitable as a power battery for transportation and vehicles. However, due to LiFePO 4 Has a slightly twisted hexagonal closest-packed structure, belongs to the Pnma space group, and the crystal is composed of MO 6 Octahedron and PO 4 The tetrahedrons...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/36H01M4/58H01M4/62H01M4/04H01M10/38H01M10/40
CPCY02E60/12Y02E60/10
Inventor 涂江平张礼相佳媛张文魁蒋永庆黄小强许健龙艺黄崇明
Owner 杭州海孚新能源科技有限公司
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