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Lithium ion battery cathode material lanthanum strontium cobalt oxide and carbon coated lithium iron phosphate and preparation method thereof

A technology for coating lithium iron phosphate and lithium ion batteries, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor high-rate charge and discharge performance, and achieve improved discharge capacity, reduced corrosion, and excellent electrochemical performance. Effect

Inactive Publication Date: 2012-04-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the existing carbon-coated LiFePO 4 The shortcomings of the high-rate charge-discharge performance of the positive electrode material are poor, and a new method for lithium-ion battery positive electrode LiFePO is provided. 4 The material is coated with LSC and carbon composite, and has excellent electrochemical performance (especially high-rate electrochemical performance) lithium-ion battery cathode material

Method used

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  • Lithium ion battery cathode material lanthanum strontium cobalt oxide and carbon coated lithium iron phosphate and preparation method thereof
  • Lithium ion battery cathode material lanthanum strontium cobalt oxide and carbon coated lithium iron phosphate and preparation method thereof
  • Lithium ion battery cathode material lanthanum strontium cobalt oxide and carbon coated lithium iron phosphate and preparation method thereof

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Effect test

Embodiment 1

[0030] LiFePO prepared by carbothermal reduction method 4 +C (C content 3.58wt.%) was used as the matrix material, and the LSC powder prepared by the above-mentioned glycine combustion method was used as the coating. 2.97 grams of matrix materials were dispersed in 150 grams of absolute ethanol (mass concentration 1.9wt.%), 0.03 grams of LSC were dispersed in 20 grams of absolute ethanol (mass concentration 0.15wt.%), and the above two solutions were ultrasonically After shaking for 20 minutes, stir at room temperature for 4 hours. Add LSC alcohol suspension drop by drop to LiFePO 4 / C suspension, stirred at 60°C, and evaporated the mixed suspension until it became a paste. After that, it was dried in an oven, heat-treated at 400°C for 2 hours in a nitrogen atmosphere, ground, and sieved to obtain 1wt.% LSC-coated LiFePO 4 / C / LSC powder has good electrochemical performance. The battery was first charged and discharged at 0.1 rate for 5 cycles, and then charged and discharg...

Embodiment 2

[0032] LiFePO prepared by carbothermal reduction method 4 +C (C content 3.58wt.%) was used as the matrix material, and the above-mentioned glycine combustion method was used to prepare LSC. Take 2.94 grams of LiFePO 4 / C material is dispersed in 150 grams of absolute ethanol (mass concentration 1.9wt.%), 0.06 grams of LSC is dispersed in 30 grams of absolute ethanol (mass concentration 0.2wt.%), and stirred at room temperature after ultrasonic oscillation for 20 minutes 4 hours; then add the LSC solution drop by drop to LiFePO under the premise of heating and stirring at 25°C 4 / C solution, continue to heat and stir at this temperature to evaporate the liquid until it becomes a paste, then dry it in an oven below 70°C, heat-treat at 400°C for 2 hours in a nitrogen atmosphere, grind, and pass through a 280-mesh sieve to obtain 2wt.% LSC coated LiFePO 4 / C / LSC powder. The battery was first charged and discharged at 0.1 rate for 5 cycles, and then charged and discharged at 0....

Embodiment 3

[0034] LiFePO prepared by carbothermal reduction method 4 +C (C content 3.58wt.%) material, LSC was prepared by the above-mentioned glycine combustion method. Take 2.91 grams of LiFePO 4 / C material is dispersed in 150 grams of absolute ethanol (mass concentration 1.9wt.%), 0.09 grams of LSC is dispersed in 45 grams of absolute ethanol (mass concentration 0.2wt.%), and stirred at room temperature after ultrasonic oscillation for 20 minutes 4 hours; then add the LSC alcohol suspension drop by drop to LiFePO under the premise of heating and stirring at 70°C 4 / C alcohol suspension, continue to heat and stir at this temperature to evaporate the liquid until it becomes a paste, then dry it in an oven below 70°C, heat-treat at 400°C for 2 hours in a nitrogen atmosphere, grind, and pass through 280 mesh Sieve to get 3wt.% LSC-coated LiFePO 4 / C / LSC powder. The battery was first charged and discharged at 0.1 rate for 5 cycles, and then charged and discharged at 0.2 rate, 0.5 rate...

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Abstract

The invention discloses a lithium ion battery cathode material La0.6Sr0.4CoO2.8(LSC) and carbon coated LiFePO4. C-coated LiFePO4 powder is used as a substrate, the LSC is coated on the surface of the C-coated LiFeO4, so the C and LSC coated LiFePO4 is formed; the C accounts for 1 to 12 mass percent of the LiFePO4+C; and the LSC accounts for 0.1 to 10 mass percent of LiFePO4+C+LSC. A preparation method comprises the following steps of: respectively weighing the LiFePO4+C powder and the LSC powder; dispersing the weighed LiFePO4+C powder and the weighed LSC powder into alcohol; performing ultrasonic oscillation on two kinds of suspension for 10 to 60 minutes, and stirring at room temperature for 1 to 10 hours; adding LSC suspension into LiFePO4+C suspension dropwise; stirring at the temperature of 25 to 80 DEG C to evaporate so as to obtain paste and drying; and performing heat treatment in an inert atmosphere at the temperature of 200 to 700 DEG C for 1 to 10 hours, grinding, and screening to obtain target powder LiFePO4+C+LSC. The ionic conductivity and the electronic conductivity of an active substance LiFePO4 are improved; the discharge capacity of the cathode material is improved; and direct contact between the LiFePO4 particle and the electrolyte is prevented, so corrosion of the electrolyte on the active substance is reduced and the cycle performance is improved.

Description

technical field [0001] The present invention relates to lithium-ion batteries, in particular to a strontium lanthanum cobaltate (La 0.6 Sr 0.4 CoO 2.8 , abbreviated as LSC) and carbon (C) composite coated LiFePO 4 Lithium-ion battery cathode material and preparation method thereof. Background technique [0002] In the occasions such as electronic digital products that do not require lithium-ion batteries to have a large capacity, lithium-ion batteries have formed a large production scale. However, the large-capacity and high-power lithium-ion batteries required by portable electric tools and electric vehicles are still in the research and development stage. Of which LiFePO 4 (Lithium iron phosphate) material has the advantages of rich raw material resources, high capacity, stable charge and discharge platform, non-toxic, environment-friendly, good thermal stability, and high safety, so it has become the most potential anode material for a new generation of lithium-ion b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58
CPCY02E60/12Y02E60/10
Inventor 郭瑞松曹建梅
Owner TIANJIN UNIV
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