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Modified lithium iron phosphate material and preparation method and application thereof

A technology of lithium iron phosphate and carbon-coated lithium iron phosphate, which is applied in the directions of phosphate, phosphorus oxyacid, chemical instruments and methods, etc. It can improve the effective ion exchange interface, avoid the phenomenon of lithium precipitation in the pole piece, and shorten the liquid absorption time.

Active Publication Date: 2020-07-17
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, increasing the material and the compaction density of the pole piece will lead to a decrease in the porosity of the pole piece, which in turn will lead to LiFePO 4 The wettability of the positive electrode sheet in the electrolyte becomes poor, which affects its electrochemical performance
LiFePO 4 The electrode piece of inorganic material has poor wettability in the electrolyte solution containing organic solvents, and some electrodes will not be in contact with the electrolyte solution, so that the effective ion exchange interface of the entire electrode becomes smaller, and the impedance rises accordingly, resulting in an increase in the internal resistance of the battery. Capacity attenuation, and even lead to lithium deposition in the pole piece, which eventually creates a safety hazard

Method used

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  • Modified lithium iron phosphate material and preparation method and application thereof
  • Modified lithium iron phosphate material and preparation method and application thereof

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preparation example Construction

[0053] According to the method for preparing a modified lithium iron phosphate material according to an embodiment of the present invention, the method is to coat a conductive polymer on the surface of a carbon-coated lithium iron phosphate material, because the conductive polymer is composed of a polymer having a conjugated π-bond via Chemical or electrochemical "doping" converts a class of polymer materials from insulators to conductors, so that it not only has the characteristics of semiconductors or conductors brought about by doping, but also improves the electronic conductivity and electrical conductivity of materials to a certain extent. In addition to the ion diffusion rate, it can also better contact the electrolyte through hydrogen bonding, thereby improving the wetting effect of the pole piece with the modified lithium iron phosphate material, and the wettability with the electrolyte is significantly improved, and the pole piece absorbs liquid The time is shortened, ...

Embodiment 1

[0059] (1) First press Fe 2+ :P 5+ The molar ratio is 1:1 to prepare ferrous sulfate with a concentration of 0.5mol / L and phosphoric acid with a concentration of 0.5mol / L. Phosphoric acid is used as the mother liquor in a closed reactor filled with nitrogen, and the dispersant deionized water is added. The molar ratio of phosphoric acid to deionized water is 1000:13. The dispersed phosphoric acid is heated to 30-50°C, and then respectively 25mL / h and 200mL / h flow rate are added ferrous sulfate and hydrogen peroxide oxidizing agent in the dispersed mother liquor, and the quality of oxidizing agent is 20% of ferrous sulfate quality, obtains ferric phosphate aqueous solution after reaction finishes. The ferric phosphate aqueous solution was repeatedly centrifuged and washed 5 times to remove impurities, and then vacuum-dried at 120° C. for 15 hours to obtain ferric phosphate.

[0060] (2) Add the obtained iron phosphate and lithium source to deionized water with a molar ratio o...

Embodiment 2

[0067] Example 2 Change the Conductive Polymer Type

[0068] (1) First press Fe 2+ :P 5+ The molar ratio is 1:1 to prepare ferrous sulfate with a concentration of 0.5mol / L and phosphoric acid with a concentration of 0.5mol / L. Phosphoric acid is used as the mother liquor in a closed reactor filled with nitrogen, and the dispersant deionized water is added. The molar ratio of phosphoric acid to deionized water is 1000:13. The dispersed phosphoric acid is heated to 30-50°C, and then respectively 25mL / h and 200mL / h flow rate are added ferrous sulfate and hydrogen peroxide oxidizing agent in the dispersed mother liquor, and the quality of oxidizing agent is 20% of ferrous sulfate quality, obtains ferric phosphate aqueous solution after reaction finishes. The ferric phosphate aqueous solution was repeatedly centrifuged and washed 5 times to remove impurities, and then vacuum-dried at 120° C. for 15 hours to obtain ferric phosphate.

[0069] (2) Add the obtained iron phosphate and...

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Abstract

The invention discloses a modified lithium iron phosphate material as well as a preparation method and application thereof. The method comprises the following steps of mixing a carbon-coated lithium iron phosphate material, a conductive polymer, a first solvent and an initiator, carrying out ultrasonic and reflux treatment to obtain a reaction solution, and carrying out solid-liquid separation, washing and drying treatment on the obtained reaction solution to obtain the modified lithium iron phosphate material. The modified lithium iron phosphate material prepared by the method can improve thewettability of a rolled pole piece and an electrolyte and shorten the liquid absorption time.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries and their applications. Specifically, the invention relates to modified lithium iron phosphate materials and their preparation methods and applications. Background technique [0002] Lithium iron phosphate (LiFePO) with olivine structure 4 ) material has the advantages of high theoretical capacity, environmental friendliness, long cycle life, good thermal stability, stable discharge platform, high safety performance, low cost, and environmental friendliness, and has become the most promising cathode material for lithium-ion batteries. However, LiFePO 4 The inherent defects of the olivine structure lead to its low electronic conductivity and slow ion diffusion rate, and the high rate charge and discharge capacity fades too fast, which limits its practical application in power batteries. In addition, the theoretical compaction density of lithium iron phosphate material is 3.4g / cm 3 , wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/60H01M10/0525C01B25/26C01B25/37C01B25/45
CPCH01M4/366H01M4/602H01M4/5825H01M10/0525C01B25/26C01B25/45C01B25/375Y02E60/10
Inventor 马可新其他发明人请求不公开姓名
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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