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Preparation method and application of spherical lithium ferrite material/carbon cathode material composite

A cathode material and composite technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of low lithium ion diffusion coefficient, low electronic conductivity, and limitations

Active Publication Date: 2015-03-04
FORMOSA BIOMEDICAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] Lithium iron phosphate (LiFePO 4 ) has a special olivine-like structure, but it also has the disadvantages of "low electronic conductivity" and "low diffusion coefficient of lithium ions". limit

Method used

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  • Preparation method and application of spherical lithium ferrite material/carbon cathode material composite
  • Preparation method and application of spherical lithium ferrite material/carbon cathode material composite
  • Preparation method and application of spherical lithium ferrite material/carbon cathode material composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0160] A circular cathode electrode for a coin-type battery was fabricated using the LFP / C sample C, and was sealed via a battery sealing machine to fabricate a coin-type battery, respectively. The reversible oxidation / reduction electrochemical reaction CV diagram of the LFP / C circular cathode electrode was obtained by cyclic voltammetry (CV), as shown in Figure 13 Shown, and get its related CV parameter values, as shown in Table 4.

[0161] Table 4 CV parameter analysis results

[0162]

[0163] and , according to the CV parameter values ​​in Table 4, the circular cathode electrode made of LFP / C sample C, its ΔE 1 Between 0.71 and 0.72, R 1 and R 2 Between 1.02 and 1.19, which means that the composite spherical LFP / C prepared by spray drying method has a good reversible oxidation / reduction electrochemical reaction in the potential range of 2.5-4.3V, and can also increase the battery life of the button battery. The overall stability and the ability to charge and disc...

Embodiment 2

[0165] Use LFP / C cathode material sample B to make circular cathode electrodes for button batteries, and then use a discharge analyzer to test the discharge capacity at 0.1C, 0.2C~10C charge / discharge rates. The test results are shown in Table 5 and Table 6, and the charge and discharge curves are shown in Figure 14 and Figure 15 shown.

[0166] Table 5 Gram capacity at 0.1C / 0.1C charge / discharge rate

[0167]

[0168]

[0169] Table 6 The gram capacitance at different charge / discharge rates from 0.2C to 10C

[0170]

[0171]

[0172] According to the gram capacity parameter values ​​in Table 5 and Table 6, the button-type battery of the present embodiment uses a one-stage spray-coated carbon source to synthesize an LFP / C cathode material coated with 6wt% Glu+10wt% nano PS balls by LFP as Circular negative electrode, at 0.1C / 0.1C charge / discharge rate, its gram capacitance can reach 137mAh / g, and at 0.2C / 0.2C, 0.2C / 0.5C and 0.2C / 1C charge / discharge rate , the...

Embodiment 3

[0174] Use LFP / C cathode material sample C to make circular cathode electrodes for button batteries, and then use a discharge analyzer to test the discharge capacity at 0.1C, 0.2C~10C charge / discharge rates. The test results are shown in Table 7 and Table 8, and the charge and discharge curves are shown in Figure 16 and Figure 17 shown.

[0175] Table 7 Gram capacity at 0.1C / 0.1C charge / discharge rate

[0176]

[0177] Table 8 Capacitance in grams at different charge / discharge rates from 0.2C to 10C

[0178]

[0179]

[0180] According to the gram capacity parameter values ​​in Table 7 and Table 8, the button-type battery of the present embodiment uses a two-stage spray-coated carbon source to synthesize LFP-coated 6wt%Glu+10wt% nano PS ball LFP / C cathode material It is a circular negative electrode, and its gram capacitance can reach 158mAh / g at 0.1C / 0.1C charge / discharge rate; at 0.2C / 0.2C, 0.2C / 0.5C, 0.2C / 1C, 0.2C / 3C And 0.2C / 5C charge / discharge rate, its gra...

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Abstract

The invention provides a preparation method and application of spherical lithium ferrite material / carbon cathode material composite. Spherical lithium ferrite phosphate / carbon (LFP / C) cathode material or lithium ferrite phosphorous oxide / carbon (LFPO / C) cathode material is synthesized through spray drying, and particularly the prepared LFP / C cathode material or the LFPO / C cathode material has a 3D spherical structure with many pores, so the electrical conductivity of active material of the lithium ferrite material can be greatly improved. Except the problem that the lithium ferrite material is low in electrical conductivity, the prepared lithium ferrite material / carbon cathode material has high power characteristic and stable cycle life of charging / discharging, so the spherical lithium ferrite material / carbon cathode material composite can be used for the cathode of a lithium-Ion Secondary battery.

Description

[0001] The present invention claims international priority: the basic case is TW102136253 Priority date: October 07, 2013. technical field [0002] The invention relates to a composite spherical lithium-iron material / carbon cathode material, in particular to a preparation method and application of a lithium-iron material / carbon cathode material with a spherical structure synthesized by spray drying. Background technique [0003] In recent years, the performance of lithium-ion secondary batteries has been significantly improved with the continuous development of materials and electrochemical technologies, and has been widely used in various 3C products. [0004] The basic structure of lithium-ion secondary batteries, including: (1) anode material (Anode material), (2) electrolyte (Electrolyte), (3) separator (Separator) and (4) cathode material (Cathode material) four Among them, the active material of the cathode material not only dominates the capacity of the lithium-ion s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M10/0525
CPCH01M4/133H01M4/136H01M4/5805H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 王瑞瑜杨纯诚陈伟皇张世璋简文镇
Owner FORMOSA BIOMEDICAL TECH CORP
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