Lithium iron conductive complex modified lithium iron phosphate anode material and preparation method thereof

A lithium iron phosphate, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as being unable to meet the requirements of long life of electric vehicles, reducing battery volume specific power, and deteriorating surface stability. The effect of lithium ion diffusivity, improving mechanical properties and increasing bond strength

Active Publication Date: 2014-08-27
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the nanonization of particles makes LiFePO 4 The structure and surface stability of the material deteriorate
LiFePO with poor stability 4 Particles in the electrolyte, especially at high temperature (> 45 ℃), the performance will deteriorate rapidly, unable to meet the long life requirements of electric vehicles
In addition, the smaller the particle size, the lower the tap density of the material, which will greatly reduce the volume specific power of the battery

Method used

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  • Lithium iron conductive complex modified lithium iron phosphate anode material and preparation method thereof
  • Lithium iron conductive complex modified lithium iron phosphate anode material and preparation method thereof
  • Lithium iron conductive complex modified lithium iron phosphate anode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0019] 1g of polyethylene oxide (PEO) was dissolved in anhydrous acetonitrile to form a 5% solution by mass, and LiClO was added 4 (Its molar ratio with PEO is PEO repeating unit / Li + =8 / 1), stirred at room temperature for 1 hour, and dried the solvent to obtain PEO / LiClO 4 Lithium ion conducting complex. 1.2gPEO / LiClO 4 The lithium ion conductive complex and 12 g of lithium iron phosphate powder were ultrasonically oscillated in anhydrous acetonitrile for 60 minutes, and the solvent was dried to obtain a lithium iron phosphate positive electrode material modified by the lithium ion conductive complex.

[0020] After mixing lithium iron phosphate cathode material powder (active material) modified by lithium ion conductive complex with acetylene black (conductive agent) and PTFE (binder) according to the mass ratio of 75:20:5, drop an appropriate amount of Stir the isopropanol solvent evenly, and press it into a uniform film with a film laminator. After fully drying at 120°...

Embodiment 2

[0023] 1g polyacrylonitrile (PAN) is dissolved in the mixed solvent of anhydrous N,N-dimethylformamide and N,N-dimethylacetamide to form a solution with a mass percentage of 15%, adding LiAsF 6 (Its molar ratio with PAN is PAN repeating unit / Li +=5 / 1), stirred at room temperature for 2 hours, and dried the solvent to obtain PAN / LiAsF 6 Lithium ion conducting complex. 1.2g of the lithium ion conductive complex and 6g of lithium iron phosphate powder were ultrasonically oscillated for 40 minutes in a mixed solvent of anhydrous N,N-dimethylformamide and N,N-dimethylacetamide, and the solvent was dried That is, the lithium iron phosphate positive electrode material composite positive electrode material modified by the lithium ion conductive complex is obtained.

Embodiment 3

[0025] 1g of polymethyl methacrylate (PMMA) was dissolved in anhydrous N,N-dimethylacetamide to form a 30% solution by mass, and LiPF was added 6 (Its mol ratio with PMMA is PMMA repeating unit / Li + =10 / 1), stirred at room temperature for 5 hours to obtain PMMA / LiPF 6 Lithium ion conducting complex. 1.2g of the lithium ion conductive complex and 2.4g of lithium iron phosphate powder were ultrasonically oscillated in anhydrous N, N-dimethylacetamide for 60 minutes, and the solvent was dried to obtain phosphoric acid modified by the lithium ion conductive complex. Iron-lithium cathode material composite cathode material.

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Abstract

The invention relates to a lithium iron conductive complex modified lithium iron phosphate anode material and a preparation method thereof. A lithium iron conductive complex is formed by complexing of an organic polymer, which comprises a group capable of coordinating with lithium, and lithium. The specific preparation method for the lithium iron conductive complex modified lithium iron phosphate anode material comprises the following steps: performing complexing of the organic polymer and lithium in solution in a specific mole ratio and drying at first; and then mixing the obtained product with lithium iron phosphate powder fully to obtain lithium iron conductive complex modified lithium iron phosphate, which can be used as an anode material of a lithium ion battery. Compared with a commercial lithium iron phosphate assembled battery, the lithium ion battery based on the anode material has higher discharge specific capacity and cycle performance. The preparation method is simple and easy in process and favorable for implementation of industrial production.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium ion batteries, and in particular relates to a lithium iron phosphate cathode material modified by a lithium ion conductive complex and a preparation method thereof. Background technique [0002] As a new type of secondary battery, lithium-ion batteries have been widely used in military and civilian portable electronic products and communications because of their advantages such as high specific energy, high open-circuit voltage of a single cell, wide operating temperature range, no memory effect, and long storage life. Tools accounted for the largest share in the secondary battery market. In recent years, many companies and research institutions have devoted themselves to the development of high-power and large-capacity lithium-ion batteries used in electric vehicles, aerospace, energy storage and other fields. Among them, the lithium-ion battery SCiB system developed by Tos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62H01M4/136H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 解孝林龚春丽周兴平薛志刚王晓恩
Owner HUAZHONG UNIV OF SCI & TECH
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