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Method for preparing phosphate positive-pole material of lithium-ion cell

A lithium-ion battery and cathode material technology, applied in the field of battery cathode material preparation, can solve the problems of harsh process requirements, difficult to obtain results, reduce the actual capacity of materials, etc., and achieve the effect of simple process conditions and high actual capacity

Inactive Publication Date: 2005-10-05
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using Li 2 CO 3 Preparation of LiFePO as raw material 4 , the process requirements are very harsh, and it is difficult to obtain satisfactory results; and using Li 2 CO 3 As a raw material, it is easy to form Li 3 PO 4 , while Li 3 PO 4 The formation of the material will inevitably greatly reduce the actual capacity of the material, so that the actual capacity of the battery is only 120mAhg -1 about

Method used

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  • Method for preparing phosphate positive-pole material of lithium-ion cell
  • Method for preparing phosphate positive-pole material of lithium-ion cell
  • Method for preparing phosphate positive-pole material of lithium-ion cell

Examples

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Effect test

Embodiment 1

[0032] LiF, FeC 2 o 4 2H 2 O and NH 4 h 2 PO 4 Take by weighing according to the stoichiometric ratio of Li:Fe:P=1:1:1, grind in an agate mortar for 30min, and mix well;

[0033] Then carry out pretreatment under argon protection at 200°C for 24 hours, and then grind after natural cooling;

[0034] Finally, under argon protection, sintering at 700°C for 24 hours, and cooling naturally, the phosphate cathode material LiFePO for lithium-ion batteries was obtained. 4 .

[0035] The LiFePO 4 The charge and discharge curve of the first 2 weeks see figure 1 , for circularity see Figure 6 , The charge and discharge current is 10mA / g.

Embodiment 2

[0037] LiF, FeC 2 o 4 2H 2 O and (NH 4 ) 2 HPO 4 According to the stoichiometric ratio of Li:Fe:P=1:1:1, each mole of LiFePO 4 Add 26g of sucrose and mix the mixture evenly;

[0038] Then carry out pretreatment under argon protection at 400°C for 8 hours, and then grind after natural cooling;

[0039] Finally, under argon protection, sintering at 700°C for 24 hours, and cooling naturally, the carbon-coated lithium-ion battery phosphate cathode material LiFePO was obtained. 4 .

[0040] The carbon coated LiFePO 4 The charge-discharge curve of the 20th week see figure 2 , for circularity see Figure 6 , The charge and discharge current is 10mA / g.

Embodiment 3

[0042] LiF, Fe 3 (PO 4 ) 2 ·5H 2 O and (NH 4 ) 3 PO 4 Take by weighing according to the stoichiometric ratio of Li:Fe:P=1:1:1, grind in an agate mortar for 30min, and mix well;

[0043] Then carry out pretreatment under argon protection at 500°C for 0.5h, and then grind after natural cooling;

[0044] Finally, under argon protection, sintering at 600 °C for 48 hours, and natural cooling, the phosphate cathode material LiFePO for lithium-ion batteries was obtained. 4 .

[0045] The LiFePO 4 The charge and discharge curve of the first 2 weeks see image 3 , for circularity see Figure 6 , The charge and discharge current is 10mA / g.

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Abstract

The method includes following steps: mixing predecessors of lithium, iron or vanadium salts, phosphate according to ratio; pretreatment is carried out at 200 - 500 deg.C; finally, sintering reaction is carried out at 400 - 1200 deg.C so as to obtain phosphate anode material of lithium ion cells. The said lithium salt is lithium halides. The method also carried out carbon cladding for the said anode material. The cladding materials are carbohydrate, acetylene black or graphite. The cladding materials can be added at time of mixing predecessors or at time of sintering reaction. Or, the cladding materials are added after sintering reaction, then sintering is carried out again. Advantages are: simple technique, avoiding generation of Li3PO4, and high capacity.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a battery, in particular to a preparation method of a phosphate system positive electrode material of a secondary lithium ion battery. Background technique [0002] The phosphate system cathode materials commonly used in secondary lithium-ion batteries are mainly LiFePO 4 and Li 3 V 2 (PO 4 ) 3 . In 1997, J.B.Goodenough et al proposed LiFePO in the patent USA 5,910,382 4 As a new type of positive electrode material for lithium-ion batteries, this material has cheap raw materials, no pollution to the environment, good safety performance, and high theoretical capacity (170mAhg-1), but at the same time, the material has low electrical conductivity and poor rate performance. There are limitations in application and have not been widely used. Until the 196th Electrochemical Conference held in Hawaii in 1999, M.Armand et al. published an article saying that carbon coatin...

Claims

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Application Information

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IPC IPC(8): C01B25/45C01D15/00C01G1/02H01M4/02H01M4/04H01M4/48H01M4/58H01M10/36H01M10/40
CPCH01M4/136H01M4/5825H01M10/0525Y02E60/122Y02E60/10
Inventor 王德宇黄学杰陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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