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Preparation method of hollow lithium manganese phosphate nano balls and product

A technology of lithium manganese phosphate and nanospheres is applied in the field of preparation of inorganic non-metallic materials, which can solve the problems of low electronic conductivity and ionic conductivity, restrict the application of positive electrode materials, etc. production effect

Inactive Publication Date: 2015-02-04
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 hollow lithium manganese phosphate nano balls and product
  • Preparation method of hollow lithium manganese phosphate nano balls and product
  • Preparation method of hollow lithium manganese phosphate nano balls and product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Aqueous / solvothermal synthesis of LiMnPO with a diameter of 600 nm 4 hollow nanospheres.

[0034] Synthesize LiMnPO according to the following process steps 4 hollow nanospheres.

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

[0036] 2) Weigh 0.4225g 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), 0.2875g ammonium dihydrogen phosphate ((NH 4 )H 2 PO 4 ) and 0.42g of potassium hydroxide (KOH), were dissolved in another part of ethylene glycol and water solvent with a total volume of 20ml in this order, and stirred for 30min.

[0038] 4) Slowly introduce the solution obtained in step 2) into the solution obtained in step 3), mix and stir for 3 hours, and then transfer to a high-pr...

Embodiment 2

[0041] Water / Solvothermal Synthesis of LiMnPO 4 hollow nanospheres.

[0042] Concrete processing step is identical with example 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 0.2113g manganese sulfate monohydrate; Step 3) Weigh 0.32g of lithium sulfate monohydrate, 0.1917g of ammonium dihydrogen phosphate and 0.42g of 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 hollow nanospheres.

[0045] The specific process steps are the same as Example 1, the difference is that the volume ratio of ethylene glycol and water in the mixed solvent prepared in step 1) is 1:2; step 3) takes by weighing 0.48g lithium sulfate monohydrate and 0.1917g diphosphate Ammonium hydrogen and 0.49g potassium hydroxide; in step 5), the heat treatment temperature is 240° C., and the temperature is kept for 8 hours.

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Abstract

The invention discloses a preparation method of hollow lithium manganese phosphate nano balls. The preparation method comprises the following steps: mixing ethylene glycol and water according to the volume ratio of 1 to (1-2) to obtain a mixed solvent; mixing one part of the ethylene glycol / water mixed solvent with manganese sulfate to obtain a mixed solution I with the concentration of 0.0625M-0.125M; mixing part of the ethylene glycol / water mixed solvent with lithium sulfate and ammonium dihydrogen phosphate to obtain a mixed solution; agitating the mixed solution uniformly and adding KOH; continually agitating to obtain a mixed solution II, wherein the concentration of lithium sulfate in the mixed solution II is 0.125M-0.1875M, the concentration of the ammonium dihydrogen phosphate in the mixed solution II is 0.083M-0.125M and the concentration of potassium hydroxide in the mixed solution II is 0.375M-0.4375M; and adding the mixed solution I into the mixed solution II, agitating uniformly and carrying out hydrothermal reaction to obtain the hollow lithium manganese phosphate nano balls, wherein the volume ratio of the mixed solution I to the mixed solution II is (1-1.2) to 1. The method for preparing the hollow lithium manganese phosphate nano balls is obtained by accurately controlling a feeding sequence and reaction conditions.

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 hollow nanospheres. 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 and ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/1397B82Y40/00
CPCB82Y40/00H01M4/1397H01M4/5825Y02E60/10
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