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Defect-sensitized lithium ferrous phosphate cathode material and preparation method thereof

A technology for sensitizing lithium iron phosphate and cathode materials, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as ion mixing, and achieve the effect of complete structure, uniform grains, and broad market application prospects.

Inactive Publication Date: 2014-09-24
淄博中鼎锂电材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its research failed to consider the increase in the overall charge caused by the entry of high-valent ions into the lattice in the material design, which may be an important reason for ion shuffling

Method used

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  • Defect-sensitized lithium ferrous phosphate cathode material and preparation method thereof
  • Defect-sensitized lithium ferrous phosphate cathode material and preparation method thereof
  • Defect-sensitized lithium ferrous phosphate cathode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] Mix lithium carbonate, aluminum nitrate, ferrous oxalate, and ammonium dihydrogen phosphate in a molar ratio of 0.97:0.02:0.98:1, and then dissolve oxalic acid, which accounts for 18% of the total mass of other salts, in ethanol and add it into it for mechanical mixing. 0.5 hours; after drying, put it into a vacuum tube furnace, decompose at 500 degrees Celsius for 3 hours in a high-purity nitrogen atmosphere, and crystallize at 900 degrees Celsius for 7 hours. The obtained material was analyzed by X-ray diffraction as olivine structure, space group Pnmb, confirmed as sample 1 (sample-1): Li 0.97 Al 0.02 Fe 0.98 PO 4 / C defect-sensitized material.

Embodiment 2

[0031] Lithium hydroxide, zirconium nitrate, ferrous sulfate, and diammonium hydrogen phosphate are mixed uniformly in a molar ratio of 0.96:0.01:0.99:1, and then 15% of the total mass of other salts is dissolved in ethanol and added to the machine Mix and grind for 0.5 hours; after drying, put it into a vacuum tube furnace, decompose at 400 degrees Celsius for 4 hours in a high-purity argon atmosphere, and then crystallize at 700 degrees Celsius for 12 hours. The obtained material was analyzed by X-ray diffraction as olivine structure, space group Pnmb, confirmed as sample-2 (sample-2): Li 0.96 Zr 0.01 Fe 0.99 PO 4 / C defect-sensitized material. The resulting product was assembled into a button battery, and its AC impedance spectrum was tested at a voltage of 3.45V.

Embodiment 3

[0033] Lithium hydroxide, ferrous acetate, and diammonium hydrogen phosphate were mixed uniformly in a molar ratio of 1:1:1, and then 20% of the total mass of other salts was dissolved in citric acid in propanol and mechanically mixed for 0.5 Hours; after drying, put it into a vacuum tube furnace, decompose and treat it at 300 degrees Celsius for 5 hours in a high-purity nitrogen atmosphere, and then crystallize it at 500 degrees Celsius for 20 hours. The obtained material was analyzed by X-ray diffraction as olivine structure, space group Pnmb, confirmed as sample 3 (sample-3): LiFePO 4 / C Defect-free sensitized material. The resulting product was assembled into a button battery, and its AC impedance spectrum was tested at a voltage of 3.45V.

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Abstract

The invention relates to a defect-sensitized lithium ferrous phosphate cathode material and a preparation method thereof, belonging to the field of power batteries. The defect-sensitized lithium ferrous phosphate cathode material is characterized by having a chemical expression of Li1-aMxFe1-zPO4 / C, wherein M is zinc, manganese, aluminum, chromium, nickel, copper, scandium, yttrium, cerium or lanthanum, a is not smaller than 0 and not more than 0.1, and x is not smaller than 1 and not more than 0.05. The invention provides the practical preparation method for successfully preparing the defect-sensitized lithium ferrous phosphate (Li1-aMxFe1-xPO4 / C) cathode material by proper ion regulation, the obtained cathode material is uniform in crystal grains and complete in structure and has a better lithium ion migration property and a wide market application prospect.

Description

technical field [0001] The invention relates to a defect-sensitized lithium iron phosphate cathode material and a preparation method thereof, belonging to the field of power batteries. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) material is a good cathode material for lithium-ion batteries; this material has the advantages of non-toxicity, environmental friendliness, rich and low price of raw materials, high specific capacity, and excellent cycle stability, which makes researchers believe that it can be used at high The field of high-capacity and high-power power batteries will become the most potential positive electrode material for lithium-ion batteries. [0003] LiFePO 4 The crystal has a dense olivine structure, which endows the material with excellent cycle stability and thermal stability, but its low electrical conductivity has become a bottleneck affecting the practical use of lithium iron phosphate materials. The initial research ideas show t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 徐彦宾宗亮邓晔
Owner 淄博中鼎锂电材料科技有限公司
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