Preparation method of self-assembled spindle-shaped nanostructure lithium iron phosphate

A nanostructure, lithium iron phosphate technology, applied in the direction of nanotechnology, nanotechnology, structural parts, etc., can solve the problems of expensive additives and high equipment requirements, and achieve the effect of simple equipment, short transmission distance and mild reaction conditions

Active Publication Date: 2014-09-17
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(Yang Xia, Wenkui Zhang, Hui Huang, Yongping Gan, Jian Tian, ​​Xinyong Tao. Self-assembled mesoporous LiFePO 4 with hierarchical spindle-like architectures for high-performance lithium-ion batteries. Journal of Power Sources, 2011, 196(13): 5651-5658), but solvent heat, hydrothermal and other methods require high-pressure equipment, and their industrialization requires high equipment. and additives are more expensive

Method used

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  • Preparation method of self-assembled spindle-shaped nanostructure lithium iron phosphate
  • Preparation method of self-assembled spindle-shaped nanostructure lithium iron phosphate
  • Preparation method of self-assembled spindle-shaped nanostructure lithium iron phosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Dissolve 0.06mol lithium hydroxide in 5mL water, dissolve 3g glucose in the above solution, and then add 30mL ethylene glycol to prepare lithium hydroxide-glucose-water-ethylene glycol mixture. Transfer the mixed solution to a reactor, heat and stir to reflux temperature under a nitrogen atmosphere, and react at normal pressure for 2 hours to obtain a lithium-containing sugar pre-carbonized product for use;

[0027] (2) Dissolve 0.02mol of phosphoric acid in 5mL of water, then add 50mL of ethylene glycol to prepare a mixed solution of phosphoric acid-water-ethylene glycol for use;

[0028] (3) Dissolve 0.02mol of ferrous sulfate in 10mL of water to prepare ferrous sulfate solution for use;

[0029] (4) Quickly add the solution prepared in steps (2) and (3) into the reactor of (1) under stirring, stir and reflux at normal pressure for 24 hours, stop the reaction, and wait to cool to room temperature;

[0030] (5) Let the product obtained in the previous step stand a...

Embodiment 2

[0035] (1) Dissolve 0.06mol lithium hydroxide in 5mL water, dissolve 3g glucose in the above solution, and then add 30mL ethylene glycol to prepare a mixed solution of lithium hydroxide-glucose-water-ethylene glycol. Transfer the mixed solution to a reactor, heat and stir to reflux temperature under a nitrogen atmosphere, and react at normal pressure for 1 hour to obtain a lithium-containing sugar pre-carbonized product for use;

[0036] (2) Dissolve 0.02mol of phosphoric acid in 5mL of water, then add 10mL of ethylene glycol to prepare a mixed solution of phosphoric acid-water-ethylene glycol for use;

[0037] (3) Dissolve 0.02mol of ferrous sulfate in 10mL of water to prepare ferrous sulfate solution for use;

[0038] (4) Quickly add the solution prepared in steps (2) and (3) into the reactor of step (1) under stirring, stir and react under normal pressure reflux for 12 hours, stop the reaction, and cool to room temperature;

[0039] (5) Let the reactants obtained in the pr...

Embodiment 3-4

[0041] Change the amount of glucose used in step (1) in Example 1 to 1 g and 6 g respectively, and the other steps are the same as in Example 1. The obtained product is 3.02g and 3.05g of self-assembled spindle-shaped nanostructure lithium iron phosphate powder.

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Abstract

The invention relates to a preparation method of self-assembled spindle-shaped nanostructure lithium iron phosphate. According to the preparation method, sugar is pre-carbonized in a LiOH solution by a reflux method to obtain a product, and the product is used as a Li source and a structure-directing agent to realize synthesis and self-assembled control of lithium ion phosphate, wherein the obtained product is a nanostructure spindle-shaped body which is self-assembled by lithium ion phosphate nanoparticles with the average particle size about 50 nanometers, the long axis of the nanometer spindle-shaped body is 0.6-0.7 micron and the short axis of the nanometer spindle-shaped body is 0.18-0.23 micron. The self-assembled spindle-shaped nanostructure lithium iron phosphate prepared by the preparation method disclosed by the invention overcomes the defects of high preparation cost, high equipment requirement and the like of the traditional self-assembled spindle-shaped nanostructure lithium iron phosphate, ensures short transmission distance of lithium ions and is capable of effectively improving the utilization rate and the charge-discharge property of the anode material.

Description

technical field [0001] The technical solution of the invention relates to the positive electrode material of the lithium ion battery, which is a preparation method for preparing the self-assembled spindle-shaped nano-structure lithium iron phosphate by using the lithium-containing sugar pre-carbonized product as the lithium source and the structure-directing agent. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) is a slightly distorted hexagonal close-packed structure, which exists in the form of phospholithium in nature, has an olivine structure, and belongs to the orthorhombic Pnmb space group. In LiFePO 4 Oxygen atoms in the crystal are slightly deformed hexagonal close-packed, phosphorus atoms occupy tetrahedral voids, lithium atoms and iron atoms occupy octahedral voids. Octahedral FeO 6 Interconnected on the bc plane of the crystal, LiO with octahedral structure in the b-axis direction 6 interconnected into a chain structure. 1 FeO 6 with 2 LiO ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/45B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 刘超王滨纪秀杰张兴华唐成春胡龙
Owner HEBEI UNIV OF TECH
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