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LiMnxFe1-xPO4 positive electrode active material and preparation method thereof

A cathode active material, mnxfe1-xpo4 2h2o technology, applied in the field of LiMnxFe1-xPO4 cathode active material and its preparation, can solve the problems of low temperature performance and high rate discharge efficiency, large particle size, etc. The effect of stable performance and high yield

Active Publication Date: 2015-07-01
BYD CO LTD
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AI Technical Summary

Problems solved by technology

[0007] The present invention is in order to solve the LiMn prepared by prior art x Fe 1-x PO 4 Large particle size, low temperature performance and low high rate discharge efficiency, LiMn prepared at the same time x Fe 1-x PO 4 It is not a shortcoming of a uniform single-phase lithium manganese iron phosphate material. It provides a single-phase LiMn with small particle size, low temperature performance and high rate discharge efficiency. x Fe 1-x PO 4 and its preparation method

Method used

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  • LiMnxFe1-xPO4 positive electrode active material and preparation method thereof
  • LiMnxFe1-xPO4 positive electrode active material and preparation method thereof

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preparation example Construction

[0024] The invention provides a LiMn x Fe 1-x PO 4 A method for preparing a positive electrode active material, the method comprising the steps of:

[0025] S1. Mix soluble ferric manganese salt solution, soluble ferric salt solution and soluble phosphate-containing substance solution to form a mixed solution, and add a pH regulator to adjust the pH value to 3-14, and the reaction generates Mn x Fe 1-x PO 4 2H 2 O precursor;

[0026] S2, under an inert atmosphere, the Mn prepared in step S1 x Fe 1-x PO 4 2H 2 The O precursor was mixed with Li source and water, dried, and then calcined under an inert atmosphere to obtain LiMn x Fe 1-x PO 4 ;

[0027] Among them, 0

[0028] Simultaneously the LiMn of the present invention x Fe 1-x PO 4 In the preparation method of the positive electrode active material, soluble ferric salt and soluble ferric manganese salt are used, the valence state of iron and manganese is consistent, and the ratio of iron and manganese c...

Embodiment 1

[0051] 1. Preparation of positive electrode active material:

[0052] Add 1L of 0.35mol / l concentration of ferric nitrate and 1L of 0.65mol / l concentration of manganese nitrate solution to 1L of 1mol / l concentration of sodium phosphate solution respectively, while using citric acid to control the pH of the reaction solution to 6.7 , stirred and reacted for 3 hours under circulating water at 40°C, filtered, washed and dried to obtain beige Mn 0.65 Fe 0.35 PO 4 2H 2 O material.

[0053] Adopt Hitachi S4800 type scanning electron microscope (SEM) to observe the morphology of the phosphate precursor of above-mentioned preparation, as figure 1 As shown, it was observed that the particle size of the phosphate precursor prepared above was uniform, the size was basically the same, and there was no agglomeration phenomenon.

[0054] 0.1mol of Mn 0.65 Fe 0.35 PO 4 2H 2 O powder, 0.1 mol lithium hydroxide, 2.355 g of glucose and 3.14 g of CNT (carbon nanotube) with a solid conte...

Embodiment 2

[0061] 1. Preparation of positive electrode active materials

[0062] Add 1L of 0.4mol / l concentration of manganese chloride and 1L of 0.4mol / l concentration of ferric chloride solution to 1L of 0.8mol / l concentration of ammonium dihydrogen phosphate solution at the same time, and use ammonia water to control the concentration of the reaction solution. The pH is 7, stirred and reacted for 4 hours under the heat preservation of circulating water at 20°C, and when precipitation began to appear, it began to circulate sanding while stirring and reacting. After the reaction solution was left to age for 48 hours, it was filtered, washed and dried to obtain Nanoscale Mn 0. 5 Fe 0. 5 PO 4 2H 2 O material.

[0063] 0.5mol of Mn 0. 5 Fe 0. 5 PO 4 2H 2 O powder, 0.5mol lithium acetate, 7.85 grams of glucose and 15.7 grams of graphene with a solid content of 5% were added to 1.6L deionized water respectively, and the mixed solution was sand-milled in a sand mill for 4 hours, and t...

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Abstract

The invention provides a preparation method of a LiMnxFe1-xPO4 positive electrode active material. The method comprises the following steps that a soluble trivalent manganese salt solution, a soluble ferric iron salt solution and a soluble phosphate radical-containing substance solution are blended to form a mixed solution, the mixed solution undergoes a reaction to produce a MnxFe1-xPO4.2H2O precursor, and LiMnxFe1-xPO4 is prepared from the MnxFe1-xPO4.2H2O precursor. The invention also provides the LiMnxFe1-xPO4 positive electrode active material obtained by the preparation method. The LiMnxFe1-xPO4 positive electrode active material has the advantages of uniform particle size distribution, perfect morphology, no agglomeration, small particle size and material electroconductivity improvement. A cell prepared from the LiMnxFe1-xPO4 positive electrode active material has excellent rate discharge performance, especially has high-rate discharge performance, has a high cell charging-discharging capacity, stable cell charging-discharging performances and good cycle performances, lays the foundation in excellent positive electrode active material development and is conducive to material application and cell development.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a LiMn x Fe 1-x PO 4 Positive electrode active material and preparation method thereof. Background technique [0002] As a high-energy chemical power source, lithium-ion batteries have been widely used in mobile communications, notebook computers, video cameras, cameras, portable instruments and other fields. . [0003] Lithium-ion battery cathode material is a hot and difficult point in the existing technology research, commonly used such as LiFePO 4 , has good electrochemical performance, very stable charging and discharging platform, stable structure during charging and discharging, and has the advantages of non-toxic, non-polluting, good safety performance, can be used in high temperature environments, and a wide range of raw materials. It is currently the battery industry Competitively developed materials. But LiFePO 4 relative to Li + The electrode potential of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/45
CPCC01B25/45H01M4/136H01M4/1397H01M4/5825H01M2004/028Y02E60/10
Inventor 陈靖华徐茶清肖峰
Owner BYD CO LTD
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