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Mesoporous phosphate anode material with olivine structure and preparation method and use thereof

An olivine structure and cathode material technology, which is applied in the field of phosphate cathode materials with mesoporous morphology and olivine structure and their preparation, can solve the problems of low mass energy density of electrolyte materials, uneven distribution of material pore size, and carbon-containing materials. In order to overcome the problems of low interface transmission, good electrochemical performance and high power density

Inactive Publication Date: 2011-04-27
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, it is an object of the present invention to overcome the existing mesoporous, carbon-coated LiMPO with olivine structure 4 Such materials have the disadvantages of inhomogeneous material pore size distribution, the electrolyte is not easy to enter the material, and the material mass energy density is low. To provide a mesoporous phosphate cathode material with an olivine structure Li x A a m m B b PO z N n , the cathode material also has the advantages of low carbon content, good carbon encapsulation effect, and small size

Method used

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  • Mesoporous phosphate anode material with olivine structure and preparation method and use thereof
  • Mesoporous phosphate anode material with olivine structure and preparation method and use thereof
  • Mesoporous phosphate anode material with olivine structure and preparation method and use thereof

Examples

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Embodiment 1

[0036] Example 1: Preparation of mesoporous pure phase LiMn with olivine structure for secondary lithium battery of the present invention 0.8 Fe 0.2 PO 4

[0037] Mesoporous LiMn with olivine structure of the present invention 0.8 Fe 0.2 PO 4 It can be prepared by the following steps. First, weigh Li 2 CO 3 , MnC 2 o 4 2H 2 O, FeC 2 o 4 2H 2 O, NH 4 h 2 PO 4 , C 6 h 8 o 7 (citric acid) and carbon black are put into ethanol solvent together, after mechanical ball milling (ball milling medium particle diameter 1mm-10mm, rotating speed is 2000 rev / min, 5 hours), this mixture is pre-treated under the protection of high-purity Ar gas Sinter (the step of pre-sintering is: take 1 hour to raise the temperature from room temperature to 350 ° C, keep the temperature at 350 ° C for 4 hours, and then use 10 hours to drop to room temperature), after manual grinding and crushing, the mixture is sintered again (sintering step is: take 4 hours The temperature was raised fro...

Embodiment 2

[0038] Example 2: Preparation of mesoporous pure phase LiMnPO with olivine structure for secondary lithium battery of the present invention 4

[0039] Mesoporous LiMnPO with olivine structure of the present invention 4 It can be prepared by the following steps. First, weigh Li according to the molar ratio of 0.5:1:1:0.3:0.3 2 CO 3 , MnC 2 o 4 2H 2 O, NH 4 h 2 PO 4 , C 6 h 8 o 7 (citric acid) and carbon black are put into ethanol solvent together, after mechanical ball milling (ball milling medium particle size 1mm-10mm, rotating speed is 2000 rev / min, 5 hours), this mixture is pre-fired under the protection of high-purity Ar gas (The step of pre-burning is: use 1 hour to raise the temperature from room temperature to 350 ° C, keep the temperature at 350 ° C for 4 hours, and then use 10 hours to drop to room temperature), after manual grinding and pulverization, the mixture is sintered again (the sintering step is: use 4 hours from The room temperature was raised to...

Embodiment 3

[0040] Example 3: Preparation of mesoporous pure phase LiFePO with olivine structure for secondary lithium battery of the present invention 4 .

[0041] Mesoporous LiFePO with olivine structure of the present invention 4 It can be prepared by the following steps. First, weigh Li according to the molar ratio of 0.5:1:1:0.3:0.3 2 CO 3 , FeC 2 o 4 2H 2 O, NH 4 h 2 PO 4 , C 6 h 8 o 7 (citric acid) and carbon black are put into ethanol solvent together, after mechanical ball milling (ball milling medium particle size 1mm-10mm, rotating speed is 2000 rev / min, 5 hours), this mixture is pre-fired under the protection of high-purity Ar gas (The step of pre-burning is: use 1 hour to raise the temperature from room temperature to 350 ° C, keep the temperature at 350 ° C for 4 hours, and then use 10 hours to drop to room temperature), after manual grinding and pulverization, the mixture is sintered again (the sintering step is: use 4 hours from The room temperature was raised ...

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Abstract

The invention provides a mesoporous phosphate anode material with an olivine structure and a preparation method and use thereof. The anode material is carbon-encapsulated primary particles with nano mesoporous channels, wherein the average pore size of the mesopores is 2 to 50nm; and the anode material also has good carbon encapsulation and small particle size. The preparation method comprises the following steps of: selecting a carbon source for carbon encapsulation; adding raw materials into an organic solvent according to a chemical molar ratio and performing ball milling by using a ball-milling medium with the particle size of 1 to 10mm; and presintering and sintering at high temperature to obtain the mesoporous phosphate anode material with the olivine structure; and the preparation method has the advantages that: the method has fewer steps and is convenient to operate and low in raw material cost. The anode material can be directly used as an anode material of a secondary lithium battery or serves as an additive to be mixed with the conventional anode material.

Description

technical field [0001] The invention relates to a phosphate positive electrode material with an olivine structure and its preparation method and use, in particular to a phosphate positive electrode material with a mesoporous morphology and an olivine structure, its preparation method and use. Background technique [0002] Transition metal lithium phosphate (LiMPO) with olivine structure 4 , M=Fe, Co, Mn, Ni) is a positive electrode active material mainly used in secondary lithium batteries, which has the advantages of low raw material price, abundant storage, no pollution to the environment, stable chemical properties, very good safety performance, storage High lithium capacity, high voltage and other advantages. At present, the best performance in this series of materials is lithium iron phosphate (LiFePO 4 ). Later, LiMPO with iron doping and phosphorus substitution was developed. 4 . The disadvantage of this type of material is the low electronic and ionic conductivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/58H01M4/62B82B1/00H01M4/04B82B3/00H01M10/38
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 张斌王小建黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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