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Nano-flaky lithium manganese iron phosphate material and its preparation method and application

A technology of lithium manganese iron phosphate and nano flakes, which is applied in the field of nano flake lithium manganese iron phosphate materials and its preparation, can solve the problems of unstable structure, fast capacitance decay, and unsatisfactory rate performance, and achieve low cost, The effect of improving electronic conductivity, excellent high-current cycle stability and rate performance

Active Publication Date: 2017-01-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the lithium manganese iron phosphate material prepared by the above method still faces challenges. One of the disadvantages is that the structure is unstable, the capacity decays quickly after repeated charge and discharge, and the rate performance is not ideal.

Method used

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  • Nano-flaky lithium manganese iron phosphate material and its preparation method and application
  • Nano-flaky lithium manganese iron phosphate material and its preparation method and application
  • Nano-flaky lithium manganese iron phosphate material and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0037] Dissolve 0.027mol LiOH in 10mL ethylene glycol, stir evenly to obtain a LiOH solution with a concentration of 2.7mol / L, add 0.0099mol H 3 PO 4 Dissolve in 10mL ethylene glycol, stir evenly to obtain H 3 PO 4 Solution, then H 3 PO 4 The solution was added dropwise to the LiOH solution and stirred evenly to obtain suspension a1; add 0.009mol MnSO 4 Dissolve in a mixed solvent of 5mL ethylene glycol and 5mL deionized water to obtain solution b1, then drop b1 into a1 dropwise and stir well to obtain solution c1; dissolve 0.003mol LiOH in 10mL ethylene glycol and stir well , Get LiOH solution, add 0.0011mol H 3 PO 4 Dissolve in 10mL ethylene glycol, stir evenly to obtain H 3 PO 4 Solution, then H 3 PO 4 The solution was added dropwise to the LiOH solution and stirred evenly to obtain suspension a2; add 0.001mol FeSO 4 Dissolve in 10mL ethylene glycol to obtain solution b2, then drop b2 into a2 dropwise, stir well to obtain solution c2; drop c2 dropwise into c1, stir evenly to ob...

Embodiment 2

[0047] 0.027mol LiOH·H 2 O was dissolved in 10mL ethylene glycol, and stirred evenly to obtain a LiOH solution with a concentration of 2.7mol / L, and 0.01008mol H 3 PO 4 Dissolve in 10mL ethylene glycol, stir evenly to obtain H 3 PO 4 Solution, then H 3 PO 4 The solution was added dropwise to the LiOH solution and stirred evenly to obtain suspension a1; add 0.009mol MnSO 4 Dissolve in a mixed solvent of 5mL ethylene glycol and 5mL deionized water to obtain solution b1, then drop b1 into a1 dropwise, stir evenly to obtain solution c1; add 0.003mol LiOH·H 2 O was dissolved in 10mL ethylene glycol, and stirred evenly to obtain a LiOH solution. Add 0.00112mol H 3 PO 4 Dissolve in 10mL ethylene glycol, stir evenly to obtain H 3 PO 4 Solution, then H 3 PO 4 The solution was added dropwise to the LiOH solution and stirred evenly to obtain suspension a2; add 0.001mol FeSO 4 Dissolve in 10mL ethylene glycol to obtain solution b2, then drop b2 into a2 dropwise, stir well to obtain solution c2...

Embodiment 3

[0051] 0.027mol LiOH·H 2 O was dissolved in 10 mL of ethylene glycol and stirred evenly to obtain a LiOH solution with a concentration of 2.7 mol / L, and 0.01026 mol of H 3 PO 4 Dissolve in 10mL ethylene glycol, stir evenly to obtain H 3 PO 4 Solution, then H 3 PO 4 The solution was added dropwise to the LiOH solution and stirred evenly to obtain suspension a1; add 0.009mol MnSO 4 ·H 2 O was dissolved in a mixed solvent of 5mL ethylene glycol and 5mL deionized water to obtain solution b1, and then b1 was dropped into a1 dropwise and stirred evenly to obtain solution c1; add 0.003mol LiOH·H 2 O was dissolved in 10mL ethylene glycol and stirred evenly to obtain a LiOH solution. Add 0.00114molH 3 PO 4 Dissolve in 10mL ethylene glycol, stir evenly to obtain H 3 PO 4 Solution, then H 3 PO 4 The solution was added dropwise to the LiOH solution and stirred evenly to obtain suspension a2; add 0.001mol FeSO 4 Dissolve in 10mL ethylene glycol to obtain solution b2, then drop b2 into a2 dropwi...

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Abstract

The present invention discloses a nanometer piece shaped LMFP material, which consists of LiFe0.1Mn0.9PO4 of a piece shaped structure, and Fe is evenly distributed at a crystal lattice position of Mn; and LiFe0.1Mn0.9PO4 of the piece shaped structure is in a shape of a cuboid with a nanoscale size, wherein the sizes of the length and the width are both less than 100 nanometers, and the thickness is less than 20 nanometers. The material of the present invention can be prepared to be a LiFe0.1Mn0.9PO4 material having a nanometer piece shaped structure and LiFePO4 / LiMnPO4 being a solid solution via a small amount of iron for doping (10%) through an optimum synthesis process; moreover, the material has an outstanding large current cycling stability and rate capability. The manufacturing method has a simple and controllable process, a low power consumption, and a low cost, and is suitable for large-scale industrial productions.

Description

Technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a nano-sheet lithium iron manganese phosphate material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, and good safety performance. Therefore, they are widely used in portable electronic products such as digital cameras, mobile phones and notebook computers. They also have application prospects for electric bicycles and electric vehicles. Currently commercial lithium-ion batteries generally use lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 O 4 ), lithium iron phosphate (LiFePO 4 ) As a cathode material. Among the above materials, LiFePO 4 Due to the advantages of safety, environmental protection, and low price, the material has been used as a cathode material for batteries for electric vehicles. But the wor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 赵新兵廖龙欢谢健曹高劭
Owner ZHEJIANG UNIV