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Porous hard-carbon-coated lithium ion phosphate positive electrode material for lithium ion batteries, method for preparing porous hard-carbon-coated lithium ion phosphate positive electrode material, porous electrode and lithium battery

A carbon-coated technology for lithium iron phosphate and lithium ion batteries, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of easy damage to channels, insufficient uniform porosity, and insufficient performance improvement. The effect of increased contact area, uniform porosity, and excellent rate capability

Inactive Publication Date: 2019-02-19
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the porosity of the positive electrode is not uniform enough, and the channels are easily damaged, resulting in insufficient performance improvement.

Method used

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  • Porous hard-carbon-coated lithium ion phosphate positive electrode material for lithium ion batteries, method for preparing porous hard-carbon-coated lithium ion phosphate positive electrode material, porous electrode and lithium battery
  • Porous hard-carbon-coated lithium ion phosphate positive electrode material for lithium ion batteries, method for preparing porous hard-carbon-coated lithium ion phosphate positive electrode material, porous electrode and lithium battery
  • Porous hard-carbon-coated lithium ion phosphate positive electrode material for lithium ion batteries, method for preparing porous hard-carbon-coated lithium ion phosphate positive electrode material, porous electrode and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh Li according to the molar ratio Li:Fe:P=1:1:1 2 CO 3 , FeC 2 o 4 2H 2 O, NH 4 h 2 PO 4 A total of 332g, weighing 80g of PEG2000 and 5.2g of phenolic resin, put them together into a ball mill tank, the ball-to-material ratio is 6:1, add absolute ethanol as a solvent, ball mill at a speed of 400 rpm for 20 hours, and then dry at 100°C to obtain Precursor mixture; under the protection of Ar atmosphere, the mixture is heated to 400°C at a heating rate of 10°C / min and kept for 6h, and then heated to 700°C at a heating rate of 10°C / min for 8h. After cooling, a porous hard carbon package is obtained. Coated lithium iron phosphate cathode material.

[0035] The charge and discharge performance test of the product in this example: the prepared active material, conductive carbon black, and PVDF are mixed in a mass ratio of 8:1:1, coated evenly on the aluminum foil, and then vacuum-dried at 110°C for 24 hours to make a lithium battery positive electrode. Lithium met...

Embodiment 2

[0037] Weigh LiOH, Fe(NO 3 ) 3 9H 2 O, NH 4 h 2 PO 4 Put a total of 553g into the ball mill jar, weigh 300g of PVP with a K value of 90 and 50g of PVC with a molecular weight of 60,000 to 80,000, put them into the ball mill jar together, the ball-to-material ratio is 10:1, add absolute ethanol As a solvent, ball mill at 450 rpm for 24 hours, and then dry at 80°C to obtain a precursor mixture; 2 Under the protection of the atmosphere, the temperature was raised to 500°C at a heating rate of 12°C / min and kept for 10 hours, and then the temperature was raised to 750°C at a heating rate of 8°C / min and held for 6 hours. After cooling, a porous hard carbon-coated lithium iron phosphate cathode material was obtained.

[0038] The electrochemical performance test method of the product of this embodiment is the same as that of Example 1, and the test results are shown in Table 1.

Embodiment 3

[0040] Weigh Li according to the molar ratio Li:Fe:P=1:1:1 2 CO 3 , Fe 3 (PO 4 ) 2 ·8H 2 O, LiH 2 PO 4 A total of 690g, weigh 200g of PVB and 40g of PAN with a molecular weight of 80,000 to 150,000, put them into a ball mill jar together, the ball-to-material ratio is 8:1, add anhydrous ethanol: water = 7:3 as a solvent, Rotate at 300 rpm / min for 36 hours, then dry at 100°C to obtain a precursor mixture; 2 Under the protection of the atmosphere, the temperature was raised to 450°C at a heating rate of 10°C / min and kept for 10 hours, and then the temperature was raised to 800°C at a heating rate of 12°C / min and held for 8 hours. After cooling, a porous hard carbon-coated lithium iron phosphate cathode material was obtained.

[0041] The electrochemical performance test method of the product of this embodiment is the same as that of Example 1, and the test results are shown in Table 1.

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Abstract

The invention discloses a porous hard-carbon-coated lithium ion phosphate positive electrode material for lithium ion batteries, a method for preparing the porous hard-carbon-coated lithium ion phosphate positive electrode material, a porous electrode and a lithium battery. The porous hard-carbon-coated lithium ion phosphate positive electrode material for the lithium ion batteries comprises basematerial mixtures and auxiliary material components. The base material mixtures are mixtures of lithium salt, iron salt and phosphate; the auxiliary material components include pore-forming agents andhard-carbon precursors. The porous hard-carbon-coated lithium ion phosphate positive electrode material, the method, the porous electrode and the lithium battery have the advantages of high specificdischarge capacity and excellent rate capability.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a porous hard carbon-coated lithium iron phosphate cathode material for lithium ion batteries, a preparation method, a porous electrode and a lithium battery. Background technique [0002] As a new generation of green and environmentally friendly power sources, lithium-ion batteries are widely used in mobile phones, notebook computers, electric vehicles and other products due to their advantages such as small size, light weight, high discharge platform, good cycle performance, no pollution, and no memory effect. As a positive electrode material, lithium iron phosphate has been widely used in new energy vehicle power supplies due to its significant advantages in safety, cycle life, and environmental protection. However, due to the limitation of its own structure, the electronic conductivity and lithium ion diffusion rate of lithium iron phosphate are low, only 10 -9...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/58H01M4/62
CPCH01M4/13H01M4/5825H01M4/625Y02E60/10
Inventor 姚书恒齐士博刘丽媚车欢
Owner 桑顿新能源科技(长沙)有限公司
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