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LFP (lithium iron phosphate) positive electrode material with excellent low-temperature property and preparation method thereof

A technology for lithium iron phosphate and positive electrode materials, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of low ion diffusion speed, poor cycle performance and rate performance, one-dimensional ion conduction, etc. Excellent low temperature performance, no agglomeration effect

Active Publication Date: 2013-05-15
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented new type of Lithium Iron Phosphate can be used for making high capacity batteries without compromising their ability to release energy quickly due to its structure containing multiple layers of LiFePO4 molecules inside it. It also improves battery's response time at lower temperatures compared to previous methods. Overall, these improvements make LIPONS more effective than current ones while reducing costs associated therewith.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the electron conduction properties of luminous calcium iron orthophosporphyrin type molecules called LIPACs, which were previously found to provide better electrical characteristics compared to their original counterparts at room temperatures but they had issues when exposed to very cold environments like those described earlier.

Method used

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  • LFP (lithium iron phosphate) positive electrode material with excellent low-temperature property and preparation method thereof
  • LFP (lithium iron phosphate) positive electrode material with excellent low-temperature property and preparation method thereof
  • LFP (lithium iron phosphate) positive electrode material with excellent low-temperature property and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036]Weigh 1.68g of lithium carbonate, 8.03g of ferrous oxalate dihydrate and 5.16g of phosphoric acid with a concentration of 85%, wherein the molar ratio Li:Fe:P=1.02:1:1, mix well and dry at 100°C for 3 hours A dry material is obtained. A dry material was calcined in a nitrogen atmosphere at 500° C. for 8 hours, and cooled with the furnace to obtain 7.04 g of a calcined material. Add the first-calcined material, 0.11g of lithium carbonate, 0.30g of ferrous oxalate dihydrate and 0.17g of 85% phosphoric acid (Li:Fe:P=2:1:2) into 50ml of acetone, mix thoroughly at 110 Drying at °C for 2.5 hours gave a dry material. The two-calcined material was calcined in a nitrogen atmosphere at 600° C. for 8 hours, and cooled with the furnace to obtain 7.22 g of the two-calcined material. The dioxane material and 0.36 g of glucose were added to 50 ml of acetone, mixed thoroughly and then dried at 120° C. for 2 hours to obtain a tri-dry material. The three-calcined material was calcined ...

Embodiment 2

[0040] Weigh 42.16g of lithium hydroxide, 77.14g of ferric oxide, 111.14g of ammonium dihydrogen phosphate and 3.29g of tetrabutyl titanate into 700ml of deionized water, wherein the molar ratio Li:Fe:P:Ti=1.04:1 :1:0.01, mixed thoroughly and dried at 90°C for 5 hours to obtain a dry material. A dry material was calcined in an argon atmosphere at 600° C. for 4 hours, and cooled with the furnace to obtain 152.43 g of a calcined material. Add the first-fired material, 2.10g of lithium hydroxide, 2.00g of ferric oxide and 5.76g of ammonium dihydrogen phosphate (Li:Fe:P=2:1:2) into 700ml of deionized water, mix well and set at 150°C Drying was carried out for 2 hours to obtain a dry material. Calcined the two-calcined material in an argon atmosphere at 500° C. for 9 hours, and cooled with the furnace to obtain 157.61 g of the two-calcined material. Add the two-calcined material and 12g of rock sugar into 700ml of deionized water, mix well and dry at 120°C for 2 hours to obtain t...

Embodiment 3

[0042] Weigh 53.52g of anhydrous lithium acetate, 178.20g of ferric oxalate pentahydrate, 101.04g of diammonium hydrogen phosphate and 0.78g of aluminum oxide and add them to 1000ml of acetone, wherein the molar ratio Li:Fe:P:Al=1.06:1: 1:0.02, mixed thoroughly and dried at 200°C for 2 hours to obtain a dry material. A dry material was calcined in a nitrogen atmosphere at 550° C. for 6 hours, and cooled with the furnace to obtain 120.70 g of a calcined material. Add the first-calcined material, 1.96g of anhydrous lithium acetate, 3.46g of ferric oxalate pentahydrate and 3.93g of diammonium hydrogen phosphate (Li:Fe:P=2:1:2) into 1000ml of acetone, mix thoroughly at 160°C Drying was carried out for 2 hours to obtain a dry material. Calcined the two-dried material in a nitrogen atmosphere at 700° C. for 5 hours, and cooled with the furnace to obtain 123.61 g of the two-calcined material. Add the two-burned material and 12g of asphalt into 1000ml of acetone, mix well and dry at...

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Abstract

The invention relates to an LFP (lithium iron phosphate) positive electrode material with excellent low-temperature property. The LFP positive electrode material comprises LFP particles, and lithium iron pyrophosphate covering the LFP particles. The preparation method comprises the steps of fully mixing a Li-source compound, a Fe-source compound, a P-source compound and a compound containing doped metal M in a dispersing agent according to the molar ratio of X:1:1:Y, grinding and drying to obtain a dry material A, wherein X is not less than 1.02 and not greater than 1.10, and Y is not less than 0 and not greater than 0.05; heating the material A to obtain a sintered material B; adding B, the Li-source compound, the Fe-source compound and the P-source compound into the dispersing agent, grinding, and drying to obtain a dry material C; and heating the material C to obtain the LFP particles coated with lithium iron pyrophosphate. Furthermore, a carbon layer can be generated to improve the electron conductivity. The LFP positive electrode material provided by the invention is effectively improved in the low-temperature property and the rate capability.

Description

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Claims

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Application Information

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Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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