Preparation method of lithium manganese phosphate nano-microsphere and product

A technology of nano-microspheres and lithium manganese phosphate, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of low electronic conductivity and ion conductivity, and limit the application of positive electrode materials. Achieve the effect of easy control, easy large-scale production and high product purity

Inactive Publication Date: 2015-03-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiMnPO 4 The biggest problem facing the material is the low electronic conductivity and ionic conductivity, which limits its application as a cathode material

Method used

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  • Preparation method of lithium manganese phosphate nano-microsphere and product
  • Preparation method of lithium manganese phosphate nano-microsphere and product
  • Preparation method of lithium manganese phosphate nano-microsphere and product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] LiMnPO with a diameter of about 500 nm assembled by liquid-phase synthesis of nanorods with a diameter of about 30 nm 4 Rod assembled microspheres.

[0034] Synthesize LiMnPO according to the following process steps 4 Nanorods assemble microspheres.

[0035] 1) Measure ethylene glycol and deionized water at a volume ratio of 1:1, and mix the two to obtain a mixed solvent with a volume ratio of ethylene glycol and water of 1:1.

[0036] 2) Weigh 0.423g manganese sulfate monohydrate (MnSO 4 ·H 2 O), it is dissolved in a mixed solvent of ethylene glycol and water with a total volume of 20ml.

[0037] 3) Weigh 0.48g lithium sulfate monohydrate (Li 2 SO 4 ·H 2 O) and 0.287g ammonium dihydrogen phosphate ((NH 4 )H 2 PO 4 ), was dissolved successively in another part of ethylene glycol and water solvents with a total volume of 20ml, after stirring for 5 minutes, after adding 0.28g of potassium hydroxide (KOH), continue stirring for 30min.

[0038] 4) Slowly introduc...

Embodiment 2

[0041] Water / Solvothermal Synthesis of LiMnPO 4 Nanorods assemble microspheres.

[0042] Concrete processing step is identical with embodiment 1, and difference is: the volume ratio of ethylene glycol and water in the mixed solvent of preparation in step 1) is 1:1.5; Step 2) takes by weighing 0.338g manganese sulfate monohydrate; Step 3) Weigh 0.32g lithium sulfate monohydrate, 0.3g ammonium dihydrogen phosphate and 0.28g potassium hydroxide; in step 5), the heat treatment temperature is 160°C, and the temperature is kept for 24 hours.

Embodiment 3

[0044] Water / Solvothermal Synthesis of LiMnPO 4 Nanorods assemble microspheres.

[0045] Concrete processing step is identical with embodiment 1, and difference is: the volume ratio of ethylene glycol and water in the mixed solvent of preparation in step 1) is 1:2; Step 2) takes by weighing 0.563g manganese sulfate monohydrate; Step 3) 0.64g of lithium sulfate monohydrate, 0.383g of ammonium dihydrogen phosphate and 0.35g of potassium hydroxide were weighed; in step 5), the heat treatment temperature was 240°C and the temperature was kept for 8 hours.

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Abstract

The invention discloses a preparation method of a lithium manganese phosphate nano-microsphere. The method comprises the steps of mixing ethylene glycol with water according to a volume ratio of 1:(1-2) to obtain a mixed solvent, and mixing part of ethylene glycol/water mixed solvent with manganese sulfate to obtain a mixed solution I of which the concentration is 0.1-0.2 M; mixing the part of ethylene glycol/water mixed solvent with lithium sulfate and ammonium dihydrogen phosphate, performing uniform stirring, adding potassium hydroxide, and continuously performing stirring to obtain a mixed solution II, wherein the concentration of the lithium sulfate in the mixed solution II is 0.125-0.25 M, the concentration of the ammonium dihydrogen phosphate is 0.112-0.1665 M, and the concentration of the potassium hydroxide is 0.25-0.3125 M; adding the mixed solution I into the mixed solution II, performing uniform stirring to obtain a precursor solution, performing hydrothermal reaction at the temperature of 160-240 DEG C, and then performing after-treatment to obtain the lithium manganese phosphate nano-microsphere. By accurately controlling a charging sequence and reaction conditions, the method for preparing the lithium manganese phosphate nano-microsphere is obtained.

Description

technical field [0001] The invention relates to the field of preparation of inorganic non-metallic materials, in particular to a preparation method and product of lithium manganese phosphate nanometer microspheres. Background technique [0002] Energy is the most important material basis for human survival and development. With the increasing shortage of traditional fossil energy and the increasing demand for energy, new energy, especially renewable energy, has become a hot spot in the current social and scientific development. Among them, lithium-ion batteries have become an important direction for the current development of new energy because of their advantages such as high energy density, long service life, and low pollution. [0003] The charging and discharging process of lithium-ion batteries is essentially the intercalation and deintercalation process of lithium. People call this lithium-ion battery, which relies on the transfer of lithium ions between the positive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/1397H01M4/5825Y02E60/10
Inventor 徐刚鲍亮周少雄韩高荣武英曾宏李玲玲任召辉沈鸽
Owner ZHEJIANG UNIV
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