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Anode material lithium ferric phosphate containing oxygen vacancy in use for secondary battery of lithium ion, and application

A secondary lithium battery, lithium iron phosphate technology, applied in the direction of secondary batteries, battery electrodes, lithium batteries, etc., can solve the problem that the bulk electronic conductance cannot be improved, and the electronic Problems such as low conductivity

Active Publication Date: 2006-07-05
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] The purpose of the present invention is to overcome existing LiFePO 4 When such materials are used as positive electrode materials for secondary lithium batteries, the electronic conductivity and ionic conductivity are low, the use of carbon coating cannot improve the bulk phase electronic conductivity, and the doping of high-valent ions at the lithium site cannot effectively improve the electronic conductivity and ion conductivity. Provide a lithium iron phosphate positive electrode material containing oxygen vacancies for secondary lithium batteries that greatly improves the electronic conductance and ion conductance of the material by introducing oxygen vacancies into the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1. Preparation of lithium iron phosphate cathode material LiFePO containing oxygen vacancies of the present invention 3.998

[0027] Cathode material LiFePO 3.998 It can be prepared by the following steps. First, weigh LiF, FeC according to the molar ratio of 1:1:1 2 o 4 2H 2 O and NH 4 h 2 PO 4 , after mechanical ball milling (rotating speed is 500 rev / min, 3 hours), this mixture is in high-purity Ar gas / H 2 Gas mixture (H 2 Gas volume ratio accounts for 8%) heat treatment under protection (the step of heat treatment is: take 1 hour to be warmed up to 400 ℃ from room temperature, after 4 hours at 400 ℃ constant temperature, drop to room temperature with two hours), again ball milling (rotating speed is 500 rev / minutes, 1 hour), the mixture was sintered again (the sintering step was: heating up from room temperature to 600° C. in 2 hours, keeping the temperature at 600° C. for 8 hours, and then cooling down to room temperature in 3 hours.

[0028] The g...

Embodiment 2

[0031] Example 2. Preparation of lithium iron phosphate cathode material LiFePO containing oxygen vacancies for secondary lithium batteries of the present invention 3.7

[0032] Prepare the lithium iron phosphate cathode material LiFePO containing oxygen vacancies for secondary lithium batteries of the present invention according to the method of Example 1 3.7 , the difference is that the constant temperature is 8 hours at 400°C, and the constant temperature is 12 hours at 600°C. The rest of the preparation steps are the same as in Example 1.

[0033] The positive electrode of the simulated battery, the negative electrode, the electrolyte and the assembly of the battery are the same as in Example 1. The composition of the positive electrode material and the test results of the simulated battery are listed in Table 1.

Embodiment 3

[0034] Example 3. Preparation of lithium iron phosphate cathode material LiFePO containing oxygen vacancies of the present invention 3.5

[0035] Prepare the lithium iron phosphate cathode material LiFePO containing oxygen vacancies of the present invention by the method of Example 1 3.5 , the difference is that the constant temperature is 12 hours at 400°C and 24 hours at 600°C. The rest of the preparation steps are the same as in Example 1. The positive electrode of the simulated battery, the negative electrode, the electrolyte and the assembly of the battery are the same as in Example 1. The composition of the positive electrode material and the test results of the simulated battery are listed in Table 1.

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Abstract

Chemical formula of anode material is LiFe1-xMxPO4-y Nz, where M as Liú¼Naú¼Kú¼Agú¼Cu; 0íœxíœ0.1, 0ú

Description

technical field [0001] The invention relates to a positive electrode material for a secondary lithium battery, in particular to a lithium iron phosphate positive electrode material containing oxygen vacancies for a secondary lithium battery and its application. Background technique [0002] In 1997, it was first proposed by J.B.Goodenough et al. in the US patent USA 5,910,382, LiFePO 4 As a positive electrode material for secondary lithium batteries. In the same year, M.Armand et al disclosed the LiFePO 4 Materials for iron-site doping and phosphorus-site substitution. LiFePO 4 It is a positive electrode active material mainly used in secondary lithium batteries with an olivine structure. It has the advantages of low raw material price, abundant storage, no pollution to the environment, and when used in secondary lithium batteries, it has very good safety performance, high lithium storage capacity, and high voltage. However, LiFePO 4 Similar materials also have the dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/136H01M10/052H01M10/36
CPCH01M4/5825Y02E60/122H01M4/136H01M4/58H01M10/052H01M4/366Y02E60/10
Inventor 李泓黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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