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Rare-earth cerium-doped lithium iron phosphate composite electrode material

A lithium iron phosphate and composite electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor high current discharge performance and low electronic conductivity of materials

Inactive Publication Date: 2016-03-23
郑春燕
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But LiFePO 4 The disadvantage of the positive electrode material is that the electronic conductivity is relatively low, and the high-current discharge performance of the material is relatively poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take appropriate amount of chemically pure LiAc, NH 4 h 2 PO 4 , FeC 2 o 4 ?2H 2 O and Ce as raw materials, according to Li 0.99 FeCe 0.01 PO 4 The atomic ratio ingredients are taken out, and 5g of the prepared raw material mixture is taken out and poured into a ball mill jar, and 2g of sucrose and 100g of steel balls are added, and then poured into the acetone solution, after the ball mill jar is immersed, the lid of the jar is tightly closed, and The planetary ball mill is used for ball milling, and the ball milling speed is set to 300r / min. After ball milling for 6 hours, take out the ball mill jar, take out the alloy powder, put it in a flat container to dry, then put the dried powder into a quartz glass tube, and Carry out vacuum sealing, put the sealed quartz glass tube into the water, if there is no air bubble, it shows that the sealing is good, then put the quartz glass tube into a high-temperature furnace at 700°C for calcination, after calcination for 1...

Embodiment 2

[0025] Take appropriate amount of chemically pure LiAc, NH 4 h 2 PO 4 , FeC 2 o 4 ?2H 2 O and Ce as raw materials, according to Li 0.95 FeCe 0.05 PO 4 The atomic ratio ingredients are taken out, 10g of the prepared raw material mixture is poured into a ball mill jar, and 5g of sucrose and 400g of steel balls are added, and then poured into the acetone solution, after the ball mill jar is submerged, the lid of the jar is tightly closed, and the The planetary ball mill is used for ball milling, and the ball milling speed is set to 400r / min. After 4 hours of ball milling, take out the ball mill jar, take out the alloy powder, put it in a flat container to dry, then put the dried powder into a quartz glass tube, and Carry out vacuum sealing, put the sealed quartz glass tube into the water, if there is no air bubble, it shows that the sealing is good, then put the quartz glass tube into a high-temperature furnace at 800°C for calcination, after 9 hours of calcination, take o...

Embodiment 3

[0027] Take appropriate amount of chemically pure LiAc, NH 4 h 2 PO 4 , FeC 2 o 4 ?2H 2 O and Ce as raw materials, according to Li 0.9 FeCe 0.1 PO 4 The atomic ratio ingredients are taken out, 10g of the prepared raw material mixture is poured into a ball mill jar, and 5g of sucrose and 400g of steel balls are added, and then poured into the acetone solution, after the ball mill jar is submerged, the lid of the jar is tightly closed, and the The planetary ball mill is used for ball milling, and the ball milling speed is set at 400r / min. After ball milling for 5 hours, take out the ball mill jar, take out the alloy powder, put it in a flat container to dry, then put the dried powder into a quartz glass tube, and Carry out vacuum sealing, put the sealed quartz glass tube into the water, if there is no air bubble, it shows that the sealing is good, then put the quartz glass tube into a high-temperature furnace at 900°C for calcination, after calcination for 8 hours, take o...

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PUM

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Abstract

The invention discloses a rare-earth cerium-doped lithium iron phosphate composite electrode material and a preparation method thereof. According to the preparation method, a cerium element is doped in the process of preparing a lithium iron phosphate material through ball-milling and vacuum high-temperature calcining technologies, so as to form a lithium iron phosphate mixed compound. The lattice constant of the lithium iron phosphate material is increased by the doped rare-earth element; the Li<+> intercalation and deintercalation capabilities are improved; the charge-discharge stability of the material is improved; and the problem of low electronic conductivity is solved.

Description

technical field [0001] The invention relates to an electrode material, in particular to an electrode material doped with rare earth cerium and a preparation method thereof, belonging to the battery field. Background technique [0002] Since the mid-1980s, due to the portability and miniaturization of audio and video devices, the transition of batteries as power sources from dry batteries to rechargeable batteries has been promoted. Under this background, lithium-ion batteries have been developed. Lithium-ion batteries are ideal power sources for portable electronic products due to their high specific energy, low self-discharge, long cycle life, light weight, and environmental friendliness, as well as the preferred power source for future electric and hybrid electric vehicles. [0003] Lithium-ion battery cathode materials mainly include inorganic metal compound materials, organic molecular materials and polymer materials. Among them, inorganic metal compound materials have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/139
CPCH01M4/139H01M4/362H01M4/5825Y02E60/10
Inventor 郑春燕
Owner 郑春燕