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Anode material of lithium ion cell and preparation method thereof

A technology for lithium ion batteries and cathode materials, which is applied in electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve the problems of insufficient diffusion performance of lithium iron phosphate, difficult control and operation, and poor product uniformity. Achieve good recycling performance, easy control and operation, and good product uniformity

Active Publication Date: 2008-02-20
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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 2346.5 g NH 4 h 2 PO 4 , 3655.2 grams of 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 milling jar, the volume ratio of the ball to material is 1:1, sealing the ball milling jar, and continuously ball milling for 12 hours. Move the ball-milled raw materials to a high-temperature atmosphere furnace, raise the temperature to 350°C at a rate of 10°C / min, keep the temperature constant for 12 hours, then raise the temperature to 680°C at a rate of 15°C / min, and keep the constant temperature at this temperature for 24 hours. Then cool down to room temperature with the furnace and take out LiFePO 4 / C cathode material product.

[0033] The electrochemical properties of the resulting material are measured as follows: 92% positive active material, 3% acetylene black, and 5% polyvinylidene fluoride binder are uniformly mixed and made into a positive electrode sheet on an aluminum fo...

Embodiment 2

[0035] 2668 g (NH 4 ) 2 HPO 4 , 3600 grams of FeC 2 o 4 2H 2O, 770 g Li 2 CO 3 And 560 grams of polyacrylamide and 76 grams of gas phase nano-SiO 2 Mixing, adding the mixed material into the ball milling jar, the volume ratio of the ball to material is 1:1, sealing the ball milling jar, and continuously ball milling for 16 hours. Move the ball-milled raw materials to a high-temperature atmosphere furnace, raise the temperature to 300°C at a rate of 10°C / min, keep the temperature constant for 18 hours, then raise the temperature to 700°C at a rate of 15°C / min, and keep the constant temperature at this temperature for 24 hours. Then cool down to room temperature with the furnace and take out LiFePO 4 / C cathode material product.

Embodiment 3

[0037] 1420 grams of phosphorus pentoxide, 1438 grams of ferrous oxide, 864 grams of lithium hydroxide and 298 grams of polypropylene are mixed, and the mixture is added to the ball milling tank, the ball to material volume ratio is 1: 1, the ball milling tank is sealed, and the ball milling is continued for 24 Hour. Move the ball-milled raw materials to a high-temperature atmosphere furnace, raise the temperature to 300°C at a rate of 10°C / min, keep the temperature constant for 20 hours, then raise the temperature to 650°C at a rate of 10°C / min, and keep the temperature at this temperature for 24 hours. Then cool down to room temperature with the furnace and take out LiFePO 4 / C cathode material product.

[0038] Attached Figure 1 is the 0.5C rate charge and discharge curve, the voltage range is 2.0-4.2V, and the electrolyte is LiPF 6 , the solvent is EC+DMC (1:1 volume ratio), charged and discharged at a rate of 0.5C. As can be seen from accompanying drawing 1, the obtain...

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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 lithium ion battery positive electrode material and the preparation method thereof of the present invention belong to the field of batteries, in particular to a lithium iron phosphate lithium iron phosphate 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 cell voltage, high energy density, safe and reliable use, they have been widely used in mobile phones, notebook computers, electronic instruments, UPS, various portable electric tools, etc. [0003] The cathode material is an important part of the lithium-ion battery, and the cathode material of the lithium-ion battery mainly uses lithium cobalt oxide (LiCoO 2 ), the price of lithium cobaltate is higher due to the lack of cobalt resources, and its thermal stability is poor and cobalt is harmful to the environment. LiNiO is also a positive electrode material f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01D15/00C01B25/26H01M4/62
CPCY02E60/12Y02E60/10
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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