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Anode material of lithium ion cell and preparation method thereof

A technology for lithium ion batteries and positive electrode materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of insufficient diffusion performance of lithium iron phosphate ions, difficult control and operation, and poor product uniformity, etc., to achieve Good recycling performance, easy control and operation, good product uniformity

Active Publication Date: 2006-06-21
GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are certain defects and deficiencies in the high-temperature solid-state reaction method currently used. It needs to be produced under the protection of an inert gas, which is not easy to control and operate, and it is easy to cause Fe 2+ is oxidized to Fe 3+ , it is difficult to obtain pure LiFePO 4 , the uniformity of the product is not good, and there is a problem of insufficient ion diffusion performance of lithium iron phosphate, which is not suitable for popularization and application in industrial production

Method used

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  • Anode material of lithium ion cell and preparation method thereof
  • Anode material of lithium ion cell and preparation method thereof
  • Anode material of lithium ion cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] will 2346.5 grams of NH 4 H 2 PO 4 , 3655.2 g FeC 2 O 4 ·2H 2 O, 778.8 g Li 2 CO 3 and 650 grams of glucose and 75 grams of nano-TiO 2 Mixing, adding the mixed material into the ball mill tank, the volume ratio of the ball material is 1:1, sealing the ball mill tank, and continuously ball milling for 12 hours. The ball milled raw material was moved to a high temperature atmosphere furnace, heated to 350°C at a rate of 10°C / min, kept at a constant temperature for 12 hours, then heated to 680°C at a heating rate of 15°C / min, and maintained at this temperature for 24 hours at a constant temperature, Then cool to room temperature with the furnace and take out to obtain LiFePO 4 / C product of cathode material.

[0033] The electrochemical properties of the obtained material were determined by the following methods: 92% of the positive active material, 3% of acetylene black, and 5% of the polyvinylidene fluoride binder were uniformly mixed and then made into a positi...

Embodiment 2

[0035] 2668 g (NH 4 ) 2 HPO 4, 3600g FeC 2 O 4 ·2H 2 O, 770 grams of Li 2 CO 3 and 560 grams of polyacrylamide and 76 grams of fumed nano-SiO 2 Mixing, adding the mixed material into the ball mill tank, the volume ratio of the ball material is 1:1, the ball mill tank is sealed, and the ball mill is continued for 16 hours. The ball-milled raw material was moved to a high-temperature atmosphere furnace, heated to 300°C at a rate of 10°C / min, kept at a constant temperature for 18 hours, then heated to 700°C at a heating rate of 15°C / min, and maintained at this temperature for 24 hours at a constant temperature, Then cool to room temperature with the furnace and take out to obtain LiFePO 4 / C product of cathode material.

Embodiment 3

[0037] Mix 1420 grams of phosphorus pentoxide, 1438 grams of ferrous oxide, 864 grams of lithium hydroxide and 298 grams of polypropylene, add the mixture to a ball mill jar, the volume ratio of the ball to the material is 1:1, seal the ball mill jar, and continuously ball mill 24 Hour. The ball-milled raw material was moved to a high-temperature atmosphere furnace, heated to 300°C at a rate of 10°C / min, kept at a constant temperature for 20 hours, then heated to 650°C at a heating rate of 10°C / min, and maintained at this temperature for 24 hours at a constant temperature, Then cool to room temperature with the furnace and take out to obtain LiFePO 4 / C product of cathode material.

[0038] attached figure 1 It is the charge-discharge curve at 0.5C rate, the voltage range is 2.0-4.2V, and the electrolyte is LiPF 6 , the solvent is EC+DMC (volume ratio is 1:1), and it is charged and discharged at a rate of 0.5C. from the attached figure 1 It can be seen that the LiFePO obt...

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Abstract

The invention relates to prepare composite anode material LiFePO4 / C for lithium-ion cell with solid-phase method. Wherein, selecting lithium salt, ferrous salt and phosphate as material with mole proportion of Li, Fe and P as 1-1.1:1-1.02:1, putting mixture into ball grinding tank to grind for 8-24h, holding temperature at 150-400Deg for 4-24h, thermostatic baking at 500-800Deg for 10-30h, and obtaining the final product. This invention has wide material source with low cost, convenient to control. The product has well evenness and compatibility with electrolyte.

Description

technical field [0001] The invention relates to a lithium ion battery positive electrode material and a preparation method thereof, belonging to the field of batteries, in particular to a lithium ion battery composite positive electrode material lithium iron phosphate LiFePO prepared by a solid phase method 4 / C and its production method. Background technique [0002] Because lithium-ion batteries have the characteristics of high single battery voltage, high energy density, safe and reliable use, etc., they have been widely used in mobile phones, notebook computers, electronic instruments, UPS, and various portable power tools. [0003] The positive electrode material is an important part of the lithium ion battery, and the positive electrode material of the lithium ion battery is mainly lithium cobalt oxide (LiCoO 2 ), the price of lithium cobalt oxide is high due to the lack of cobalt resources, and its thermal stability is poor and cobalt is harmful to the environment. ...

Claims

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Application Information

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IPC IPC(8): C01B25/26C01D15/00H01M4/58H01M4/62
CPCY02E60/10
Inventor 李军黎良栋黄慧民薛建军夏信德
Owner GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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