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Composite lithium iron phosphate/carbon coated core-shell type lithium ferric manganese phosphate anode material and preparation method thereof

A composite positive electrode material, lithium manganese iron phosphate technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of poor capacity retention, low electronic conductivity, low discharge capacity, etc., to improve conductivity, preparation method Simple, reduces the effect of dissolution

Active Publication Date: 2017-01-18
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its electronic conductivity is lower than that of LiFePO 4 Lower, it is considered as an insulator, which makes it have low discharge capacity and poor rate performance, and Mn will dissolve during the cycle, making the capacity retention rate poor and Mn 3+ Jahn-Teller distortion occurs, limiting the LiMnPO 4 Applications

Method used

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  • Composite lithium iron phosphate/carbon coated core-shell type lithium ferric manganese phosphate anode material and preparation method thereof
  • Composite lithium iron phosphate/carbon coated core-shell type lithium ferric manganese phosphate anode material and preparation method thereof
  • Composite lithium iron phosphate/carbon coated core-shell type lithium ferric manganese phosphate anode material and preparation method thereof

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Experimental program
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Embodiment 1

[0029] Lithium iron phosphate / carbon-coated core-shell type lithium manganese iron phosphate composite positive electrode material, its composition formula is: LiMn 0.9 Fe 0.1 PO 4 / LiMn 0.2 Fe 0.8 PO 4 / LiFePO 4 / C, where the core material accounts for 80% by weight, the shell material accounts for 15% by weight, the lithium iron phosphate accounts for 3% by weight in the cladding material, and the carbon accounted for by weight in the cladding material The percentage is 2%.

[0030] 1. Preparation of crystalline Mn 0.9 Fe 0.1 PO 4 Anhydrous compound: Mix 9 mol of manganese nitrate and 1 mol of ferrous oxalate in ethanol, add 1 mol of H while stirring 3 PO 4 Solution, after reacting at 30°C for 4 hours, a gray-green precipitate was obtained, and the product was filtered and washed to obtain amorphous Mn 0.9 Fe 0.1 PO 4 Hydrate, vacuum dried at 80°C for 24h, and then calcined at 800°C for 10h under nitrogen atmosphere to obtain crystalline Mn 0.9 Fe 0.1 PO 4 an...

Embodiment 2

[0040] Lithium iron phosphate / carbon-coated core-shell type lithium manganese iron phosphate composite positive electrode material, its composition formula is: LiMn 0.85 Fe 0.15 PO 4 / LiMn 0.3 Fe 0.7 PO 4 / LiFePO 4 / C, wherein the nuclear material accounts for 70% by weight, the shell material accounts for 20% by weight, the lithium iron phosphate accounts for 7% by weight in the clad material, and the carbon accounted for by weight in the clad material The percentage is 3%.

[0041] 1. Preparation of crystalline Mn 0.85 Fe 0.15 PO 4 Anhydrous compound: mix 8.5mol of manganese sulfate and 1.5mol of ferric nitrate in ethanol, add 1mol of H while stirring 3 PO 4 Solution, after reacting at 30°C for 7 hours, a gray-green precipitate was obtained, and the product was filtered and washed to obtain amorphous Mn 0.85 Fe 0.15 PO 4 Hydrate, vacuum dried at 80°C for 24h, and then calcined at 700°C for 20h under argon atmosphere to obtain crystalline Mn 0.85 Fe 0.15 PO 4 ...

Embodiment 3

[0046] Lithium iron phosphate / carbon-coated core-shell type lithium manganese iron phosphate composite positive electrode material, its composition formula is: LiMn 0.8 Fe 0.2 PO 4 / LiMn 0.4 Fe 0.6 PO 4 / LiFePO 4 / C, wherein the nuclear material accounts for 60% by weight, the shell material accounts for 30% by weight, the lithium iron phosphate accounts for 7% by weight in the clad material, and the carbon accounted for by weight in the clad material The percentage is 3%.

[0047] 1. Preparation of crystalline Mn 0.8 Fe 0.2 PO 4 Anhydrous compound: mix 8.0mol manganese sulfate and 2.0mol ferric nitrate in ethanol, add 1mol H while stirring 3 PO 4 Solution, after reacting at 30°C for 6 hours, a gray-green precipitate was obtained, and the product was filtered and washed to obtain amorphous Mn 0.8 Fe 0.2 PO 4 Hydrate, vacuum dried at 80°C for 24h, and then calcined at 650°C for 15h in an argon-hydrogen (95:5) atmosphere to obtain crystalline Mn 0.8 Fe 0.2 PO 4 a...

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Abstract

The invention discloses a composite lithium iron phosphate / carbon coated core-shell type lithium ferric manganese phosphate anode material. The constituent general formula of the composite lithium iron phosphate / carbon coated core-shell type lithium ferric manganese phosphate anode material is LiMnxFe1-xPO4 / LiMnyFe1-yPO4 / LiFePO4 / C, wherein the constituent general formula of a core material is LiMnxFe1-xPO4, the constituent general formula of a shell material is LiMnyFe1-yPO4, the constituent general formula of a coating layer material is LiFePO4 / C, and x is greater than or equal to 0.8 but is smaller than or equal to 0.9, and y is greater than or equal to 0.2 but is smaller than or equal to 0.4. In addition, the core material accounts for 60-80% by weight of lithium iron phosphate, and the carbon in the coating layer material accounts for 2-3% by weight of lithium iron phosphate. Core-shell type lithium ferric manganese phosphate particles are obtained by adopting a coprecipitation method and a hydrothermal method and then are mixed with a lithium source, an iron source, a phosphorus source and a carbon source to perform hydrothermal reaction so as to obtain a target product. The product particles prepared by adopting the method are regular in spherical morphology, the dissolution of manganese in the anode material is greatly reduced, and the cycle performance of a battery is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, in particular to a core-shell lithium manganese iron phosphate composite positive electrode material coated with lithium iron phosphate / carbon and a preparation method thereof. Background technique [0002] With the depletion of oil resources, the energy problem has become an important issue that must be solved in the sustainable development strategy of human society. In recent years, lithium-ion batteries have achieved rapid development due to their advantages such as high working voltage, high energy density, long cycle life, no memory effect, small size, light weight, and no environmental pollution. The positive electrode material is lithium-ion One of the four important components of the battery plays a vital role in the electrochemical performance and safety performance of the lithium-ion battery, and its cost is also close to nearly half of the total cost of the ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/58H01M4/62
CPCH01M4/505H01M4/5825H01M4/624H01M4/625Y02E60/10
Inventor 齐美洲汪志全计佳佳陈勇李道聪
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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