Positive electrode material of lithium ion battery and preparing method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reducing the tap density of materials, unable to limit the deformation of positive electrode materials, and low carbon tap density

Active Publication Date: 2013-06-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon coating is an effective method to improve the electrical conductivity of materials, but due to the low tap density of carbon, carbon coating will reduce the tap density of materials while improving electrical conductivity, such as the patent of CN102364726A. In the "Method for preparing lithium iron manganese phosphate composite positive electrode materials for lithium ion batteries by carbon reduction", macromolecular organic matter is used as a carbon source, and the organic matter is decomposed into carbon and coated on the surface of lithium iron phosphate by high-temperature sintering. Although the conductivity is improved, The tap density reached 1.2g/cm 3 , but its tap density is still relatively low and needs to be further improved
[0005] In addition to carbon coating, in recent years, there have also been studies on the coating of lithium iron phosphate with metal salts or metal oxides, such as the patent of Chinese Patent Publication No. CN101859887A: "A lithium-ion battery composite positive electrode coated with transition metal phosphate In "Materials", the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Weigh 32g TiO2 2 Mix with 11.8g of lithium carbonate, add 0.4g of acetylene black, acetone as solvent, ball mill for 10 hours, separate the solvent from the powder by filtration, dry at 80°C, and sinter at 600°C for 8 hours under nitrogen protection;

[0043] (2) Accurately weigh 66.8g of iron phosphate and 27.6g of manganese carbonate with an analytical balance to make an aqueous solution, weigh 25g of lithium hydroxide, dissolve LiOH in deionized water, then add iron phosphate and manganese carbonate solution, and stir to obtain a uniform Solution, weigh 73.9g of citric acid and add to the above solution, then add 2.2g of vanadium pentoxide, add deionized water to make the volume to 350mL, transfer to a 500mL reaction kettle, and keep the temperature at 150°C for 5 hours;

[0044] (3) Mix lithium titanate prepared by the above steps with lithium iron manganese phosphate and citric acid at a mass ratio of 0.03:1:0.05, use absolute ethanol as a solvent, and perform ...

Embodiment 2

[0046] (1) Weigh 32g TiO2 2 Mix with 11.8g of lithium carbonate, add 0.56g of acetylene black, acetone as solvent, ball mill for 10 hours, separate the solvent from the powder by filtration, dry at 80°C, and sinter at 600°C for 10 hours under nitrogen protection;

[0047] (2) Accurately weigh 51.8g of ferrous oxalate, 27.6g of manganese carbonate, 62.3g of lithium dihydrogen phosphate and 3.5g of vanadium pentoxide with an analytical balance, and use absolute ethanol as a solvent, and ball mill at a speed of 400 rpm for 10 Dry at 80°C after one hour, grind after drying, pass through a 200-mesh sieve, and under the protection of nitrogen, heat up to 300°C at a speed of 3°C / min, keep it for 3 hours, then raise the temperature to 650°C, keep it for 8 hours, and naturally cool down to room temperature;

[0048] (3) Mix lithium titanate prepared by the above steps with lithium iron manganese phosphate and citric acid at a mass ratio of 0.03:1:0.05, use absolute ethanol as a solven...

Embodiment 3

[0050] (1) Weigh 32g TiO2 2 Mix with 11.8g of lithium carbonate, add 0.34g of acetylene black, acetone as solvent, ball mill for 10 hours, separate the solvent from the powder by filtration, dry at 80°C, and sinter at 700°C for 8 hours under nitrogen protection;

[0051] (2) Use an analytical balance to accurately weigh 90.5g of ferric nitrate, 6.4g of manganese carbonate, and 32.2g of ammonium dihydrogen phosphate to make an aqueous solution, weigh 11.8g of lithium hydroxide, dissolve LiOH in deionized water, and then add diphosphate Ammonium hydrogen solution, after mixing uniformly, add ferric nitrate and manganese carbonate solution, stir to obtain a uniform solution, weigh 9.9g citric acid and add it to the above solution, then add 0.98g ammonium metavanadate, add deionized water to dilute to 350mL, transfer Into a 500mL reactor, keep the temperature at 180°C for 10 hours;

[0052] (3) Mix lithium titanate prepared by the above steps with lithium iron manganese phosphate...

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PUM

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Abstract

The invention relates to a lithium titanate-carbon co-cladded lithium manganese iron phosphate positive electrode material. According to the invention, the characteristic of zero stress of a lithium titanate material is utilized for inhibition of deformation of a positive electrode during charging and discharging so as to improve cycle performance and resistance to over-charge and over-discharge of the positive electrode material, and conductivity and electrochemical properties of the positive electrode material are improved through co-cladding of the lithium titanate material and carbon; meanwhile, tap density of lithium titanate is as high as 1.68 g/cm<3>, which enables influence of carbon cladding on the tap density of the positive electrode material to be reduced. A preparation method for the positive electrode material provided by the invention is simple, is easy to operate and can easily realize industrial application.

Description

technical field [0001] The invention relates to the field of electrode material preparation, in particular, the invention relates to a lithium ion battery cathode material and a preparation method thereof. Background technique [0002] As a new type of energy storage device, lithium-ion batteries have the advantages of high working voltage, large specific energy, long cycle life, small self-discharge, wide working temperature range, good safety, no memory effect, and no pollution. Widely concerned, it has been widely used in mobile power sources for portable electronic devices and energy storage batteries for electric vehicles, and is considered to be the most promising new energy battery. [0003] The materials used to make the positive electrode of lithium-ion batteries are mainly LiCoO 2 , LiNiO 2 , LiMn 2 o 4 , nickel-cobalt-manganese ternary system and LiFePO 4 , where LiCoO 2 It has been commercialized and is currently the main cathode material for lithium-ion ba...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 谭强强吕诚吕宵徐宇兴
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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