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LiFe1-xMxPO4 compound containing carbon element and preparation method thereof

A compound and element technology, applied in phosphorus compounds, chemical instruments and methods, non-metallic elements, etc., to achieve the effects of simple process, low price, high specific capacity and cycle efficiency

Active Publication Date: 2014-11-19
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for LiFePO 4 At present, there is no literature report on the preparation of low-heat solid-state reaction method

Method used

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  • LiFe1-xMxPO4 compound containing carbon element and preparation method thereof
  • LiFe1-xMxPO4 compound containing carbon element and preparation method thereof
  • LiFe1-xMxPO4 compound containing carbon element and preparation method thereof

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preparation example Construction

[0043] The preparation method of the present invention mainly includes preparing a precursor and preparing the compound of the present invention from the precursor.

[0044] In the preparation process of the precursor, including the oxide or acetic acid of iron or ferrous salt of organic acid, lithium source compound, oxalic acid, phosphate and M element (M is Mn, Co, Ni, Al or V) Salt according to Li:Fe:H 2 C 2 o 4 :M:PO 4 = a: 1-x: 1: x: 1 ratio and add an appropriate proportion of organic matter to mix together, in which it is necessary to ensure that the Li element is excessive, that is, 1<a<1.1, when the amount of Li element changes within this range during the reaction little effect on the result. In the preparation process, a=1.05 is often selected; then a low-heat solid-state reaction is carried out at a temperature of 60° C. to 120° C. for 3 to 6 hours to obtain the precursor.

[0045] In the preparation process of precursor, the ferric salt of organic acid or fe...

Embodiment 1

[0049] With Fe:Li:H 2 C 2 o 4 :PO 4 = 1:1.05:1:1 ratio to weigh ferric citrate, LiOH·H 2 O, H 2 C 2 o 4 and NH 4 h 2 PO 4 After mixing evenly, add an appropriate proportion of sucrose, and the amount of sucrose is the theoretically generated LiFePO 4 10% of the mass. Then add an appropriate amount of deionized water to these homogeneously mixed products to make the surface of the solid particles a little wet, react at 100 ° C for 4 hours and dry to obtain the precursor, and sinter the prepared precursor at 650 ° C under an argon atmosphere The final product LiFePO can be obtained in 8 hours 4 / C compound.

Embodiment 2

[0051] With Fe:Li:H 2 C 2 o 4 :PO 4 = 1:1.05:1:1 ratio to weigh ferric citrate, LiOH·H 2 O, H 2 C 2 o 4 and NH 4 h 2 PO 4 After mixing evenly, add an appropriate proportion of glucose, the amount of glucose is theoretically generated LiFePO 4 10% of the mass. Then add an appropriate amount of deionized water to these homogeneously mixed products, react at 60°C for 6 hours and then dry to obtain the precursor, and sinter the prepared precursor at 750°C for 6 hours in a nitrogen atmosphere to obtain the final product LiFePO 4 / C compound.

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PUM

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Abstract

The invention discloses a new compound LiFe1-xMxPO4 / C, wherein M is Mn, Co, Ni, Al or V, and x is no less than 0 and no more than 1. The invention also discloses a lithium ion battery positive electrode material containing the new compound and a preparation method of the compound. The LiFe1-xMxPO4 / C compound disclosed by the invention has excellent electrochemistry performance, is prepared by adopting a low thermosetting phase reaction method, the process is simple,the synthesis temperature is lower, the price of the used material is low, and the compound LiFe1-xMxPO4 / C is convenient for large-scale production.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a LiFe 1-x m x PO 4 / C compound, its preparation method and its application as positive electrode material in lithium ion secondary battery. Background technique [0002] Lithium-ion secondary batteries have many advantages such as long cycle life, stable discharge voltage, large specific capacity, and no memory effect, making them widely used in many fields such as mobile phones, notebook computers, and portable electronic devices, and are increasingly popular among the public. Attention and favor. In recent years, with the development of hybrid electric vehicles and secondary battery electric vehicles, higher requirements have been placed on the capacity and quality of rechargeable batteries. [0003] LiFePO with olivine structure 4 It is an existing compound in nature. Because of its stable structure, excellent rate and safety performance, it is expected to become a n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397H01M4/58C01B25/45
CPCY02E60/122Y02E60/10
Inventor 相江峰
Owner SHENZHEN BAK POWER BATTERY CO LTD
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