Modified lithium iron phosphate material for lithium ion battery and preparation method thereof

A lithium-ion battery and lithium iron phosphate technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as hindering practical application, low Li+ diffusion coefficient, and limiting large-scale commercial application of lithium iron phosphate materials. To achieve the effect of ensuring the control of the environment

Inactive Publication Date: 2012-03-28
青岛瀚博电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure greatly limits the migration of lithium ions, which is also the essential reason for the small diffusion coefficient of the material.
Therefore, although LiFePO 4 Compared with other materials, it has many advantages, but its poor conductivity and low Li + Diffusion coefficient has always been the most important factor hindering its practical application
At the same time, due to the heat sensitivity of lithium iron phosphate materials in the production and preparation process, there are problems such as material consistency and batch stability.
These all limit the large-scale commercial application of lithium iron phosphate materials

Method used

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  • Modified lithium iron phosphate material for lithium ion battery and preparation method thereof
  • Modified lithium iron phosphate material for lithium ion battery and preparation method thereof
  • Modified lithium iron phosphate material for lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Weigh 90g of potassium phosphate, 90g of lithium carbonate, 90g of ferrous sulfate, 110g of natural graphite, 20g of magnesium oxide, and 1000g of sodium chloride, and add them into a ball mill jar for grinding for 2 hours; The cake-shaped grinding material was placed in a tube-type sintering furnace, and calcined for 5 hours at a temperature of 900 ° C, and then the sample was cooled to room temperature with the furnace temperature; the sintered block was placed in a ball mill and ground into a Powders with a diameter of less than 10 microns are washed twice with 5000g of water each time; after filtration, they are dried with a blower at 200°C for 2 hours to obtain the product modified lithium iron phosphate.

Embodiment 2

[0053] Take by weighing ammonium phosphate 110g, lithium hydroxide 110g, ferrous ammonium sulfate 100g, artificial graphite 110g, silicon oxide 10g, potassium chloride 1500g respectively, add in ball mill tank and grind 8 hours; Press into cake shape with cake press machine; Under the protection of nitrogen, put the cake-shaped grinding material in a tubular sintering furnace and calcinate it at a temperature of 600°C for 10 hours, then cool the sample to 150°C with the furnace temperature; put the sintered block in a ball mill Grind it into a powder with a diameter of less than 10 microns, add water to wash twice, each time with 6000g of water; after filtering, use a blower to dry at 100°C for 6 hours to obtain the product modified lithium iron phosphate.

Embodiment 3

[0055] Take by weighing 100g of sodium dihydrogen phosphate, 90g of lithium chloride, 110g of iron nitrate, 90g of graphite, 5g of neodymium nitrate, and 1200g of lithium chloride, and add them into a ball mill jar for grinding for 6 hours; press them into a cake shape with a cake press; Under protection, put the cake-shaped grinding material in a tube-type sintering furnace and calcinate it for 7 hours at a temperature of 800°C, and then cool the sample to room temperature with the furnace temperature; place the sintered block in a ball mill to grind Form into a powder with a diameter of less than 10 microns, add water to wash twice, each time with 6500 g of water; after filtering, use a blower to dry at 150 ° C for 4 hours to obtain the product modified lithium iron phosphate.

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Abstract

The invention relates to a modified lithium iron phosphate material for a lithium ion battery and a preparation method thereof. The modified lithium iron phosphate material is prepared by a molten salt method: adding a compound containing magnesium, aluminum, neodymium, rubidium, gallium, cesium, silicon, tin or carbon element for modification by taking a lithium source, an iron source and a phosphorus source as raw materials and molten salt as a flux; and grinding and then calcining. The modified lithium iron phosphate material has nano-sized granularity, a clear crystal structure and a complete crystal shape; the electron conductivity and ion diffusivity are high; and the lithium ion battery using the modified lithium iron phosphate material as a positive electrode has high cycle performance.

Description

technical field [0001] The invention relates to the field of chemical energy materials, in particular to a modified lithium iron phosphate material for lithium ion batteries and a preparation method thereof. Background technique [0002] Since the beginning of the 20th century, energy crisis and environmental pollution have become two serious problems that must be faced by the sustainable development of human society. The demand for it has grown rapidly, and the requirements for its performance have become higher and higher. Batteries, especially secondary batteries, have played an irreplaceable and important role in modern society. Lithium-ion secondary battery has become a hotspot of research and development all over the world due to its high energy density, high voltage, good cycle performance and safety performance. [0003] The success of the commercialization of lithium-ion batteries has attracted worldwide attention, and a large amount of manpower and material resou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45B82Y40/00H01M4/58
CPCY02E60/12Y02E60/10
Inventor 金影刘成全王金枝
Owner 青岛瀚博电子科技有限公司
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