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Anode composite material of lithium ion battery and preparation method thereof

A lithium-ion battery and composite material technology, which is applied in the field of lithium-ion battery positive electrode composite materials and its preparation, can solve the problems of complex process, difficult control, material containing impurity phase, uneven distribution, etc., and achieve enhanced solid-state ion diffusion ability and improved Reactivity, the effect of accelerating the reaction rate

Inactive Publication Date: 2011-04-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method of solid-state synthesis is simple, this method has a common disadvantage that the synthesized material has large grains and uneven distribution.
The advantage of sol-gel synthesis is that the obtained material particles have good uniformity, but the method is complex and difficult to control and the reaction time is long
The processes currently used require a long processing time, consume too much energy, and most of the materials prepared in the research contain impurity phases and are not pure enough

Method used

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  • Anode composite material of lithium ion battery and preparation method thereof
  • Anode composite material of lithium ion battery and preparation method thereof
  • Anode composite material of lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] 19.88gFeCl 2 ? 4H 2O and 28.42 g Na 2 SiO 3 9H 2 O ball mill and mix evenly for 60 min, wash the above mixture three times with deionized water, filter, and dry at 80°C. Will obtain precursor powder again with 7.4g Li 2 CO 3 Ball mill with 5.5 g of starch for 5 hours, mix evenly, press into tablets, and heat at 750° C. for 8 minutes in a microwave under the protection of argon to obtain the composite material. In this composite, 95% w Li 2 FeSiO 4 , 5% w C. No Fe was seen in the XRD pattern 2 o 3 , SiO 2 , Li 2 SiO 3 The composite material has high phase purity and good crystallization performance. The composite positive electrode material has a current density of 10mAg -1 Under the same conditions, the specific capacities of the first two discharges are 109.9 and 110mAh·g respectively -1 .

Embodiment 2

[0026] 9.94gFeCl 2 4H 2 O and 8.62g K 2 SiO 3 ·H 2 O ball mill and mix evenly for 40 min, wash the above mixture three times with deionized water, filter, and dry at 60°C. The obtained precursor powder was mixed with 4.42g LiOH·H 2 O and 6g of glucose were ball-milled for 4 hours, mixed uniformly, pressed into tablets, and heated at 650° C. for 10 minutes under the protection of argon by microwave to obtain the composite material. In this composite, 90% w Li 2 FeSiO 4 , 10% w C. The composite cathode material at 10mAg -1 and 30mAg -1 Under the condition of current density, the first discharge specific capacity is 119.6, 103.7mAh g -1 .

Embodiment 3

[0028] 6.95gFeSO 4 ·7H 2 O and 7.11 g Na 2 SiO 3 9H 2 O ball mill and mix evenly for 30 min, wash the above mixture three times with deionized water, filter, and dry at 70°C. The obtained precursor powder was mixed with 5.1g LiAc·2H 2 O and 4.5 g of sucrose were ball milled for 3 hours, mixed evenly, pressed into tablets, and heated at 600° C. for 15 minutes by microwave under the protection of argon to obtain the composite material. In this composite, 85% w Li 2 FeSiO 4 , 15% w C. No Fe was seen in the XRD pattern 3 o 4 , SiO 2 , Li 2 SiO 3 Other heterogeneous phases exist, and the composite material has a higher phase purity. The composite cathode material at 10mAg -1 Under current density conditions, the specific capacities of the second and third discharges are 120.9 and 121.7mAh g respectively -1 .

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Abstract

The invention provides an anode composite material of a lithium ion battery and a preparation method thereof. The anode composite material of the lithium ion battery has a molecular formula of Li2FeSio4 / C. According to mass percentage, the content of silicate is 95%-80%, and the content of compounded carbon is 5%-20%. The preparation method of the anode composite material comprises the following steps: (1) ferrite and the silicate are evenly mixed by a ball mill according to a stoichiometric proportion, thereby obtaining a mixture; the mixture is fully washed with deionized water and then dried, thereby obtaining a precursor; and (2) the precursor, lithium salt and organic carbon source undergo mixing, ball milling, tabletting and microwave treatment under inert gas shielding, thereby obtaining the Li2FeSio4 / C anode composite material of the lithium ion battery. The invention can obtain the carbon-coated anode composite material which has good crystals, thin and uniform crystal grains and high purity, and can improve the electrochemical properties of a Li2FeSio4 anode material.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode material preparation, and relates to a lithium-ion battery cathode composite material (Li 2 FeSiO 4 / C) and its preparation method. Background technique [0002] In today's world, oil resources are becoming increasingly tense and environmental pollution is becoming more and more serious. People are paying more and more attention to secondary energy powered by green secondary batteries. After more than ten years of development, lithium-ion batteries are the most dynamic green energy in the current secondary battery market, and are expected to become ideal energy storage devices for electric vehicles and hybrid vehicles. High-performance power batteries that can be used in hybrid electric vehicles and other fields are in the stage of industrialization, and the cathode material is a key part of power lithium-ion batteries. The improvement of its performance and the reduction of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/58H01M4/62H01M4/04
CPCY02E60/12Y02E60/10
Inventor 彭忠东曹雁冰胡国荣杜柯蒋庆来
Owner CENT SOUTH UNIV
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