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Method for preparing lithium ferrosilicon silicate of lithium-ion battery cathode material

A technology for lithium ferrous silicate and lithium-ion batteries, which is applied in the direction of electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve the problems that the electronic conductivity and tap density are difficult to increase at the same time, and are difficult to meet, and achieve excellent microscopic Structure, structural stability, high safety effect

Inactive Publication Date: 2009-09-23
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, LiFePO 4 It is difficult to improve the electronic conductivity and tap density of materials at the same time, and it is difficult to meet the needs of a new generation of high-capacity lithium secondary batteries

Method used

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  • Method for preparing lithium ferrosilicon silicate of lithium-ion battery cathode material
  • Method for preparing lithium ferrosilicon silicate of lithium-ion battery cathode material
  • Method for preparing lithium ferrosilicon silicate of lithium-ion battery cathode material

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preparation example Construction

[0023] The present invention relates to the preparation method of lithium ferrous silicate, the anode material of lithium ion battery, and its steps are as follows:

[0024] 1. Mix lithium salt, ferrous salt, silicon dioxide and additives in proportion (the mixing process can be carried out in conventional mixing equipment, such as inclined mill, cone mixer, three-dimensional mixer for 1 to 24 hours; Wet chemical method can also be used, such as sol-gel method, spray drying method to mix), wherein, the molar ratio of Li: Fe: Si is (1.9-2.1): (0.95-1.05): 1 The addition of additive is the mixture 1-30% of the total mass;

[0025] The above-mentioned additives can be carbon black, graphite or organic compounds that can be decomposed into conductive carbon substances after pyrolysis;

[0026] 2. Put the uniformly mixed raw materials into the heat treatment equipment (any heat treatment equipment that can uniformly heat the reaction mixture under the protection of atmosphere can ...

Embodiment 1

[0032] 2.7g of lithium silicate, 5.4g of ferrous oxalate, and 2g of sucrose were mixed and ball-milled in ethanol for 24 hours. The equipment used was a planetary ball mill with an autopropagation speed of 200r / min. The well-mixed and ground mixed powder was vacuum-dried at 60°C for 24 hours, then pressed into tablets at a pressure of 10 MPa, and raised to 400°C at a rate of 10°C / min under the protection of an argon atmosphere of 1 L / min. Keep it warm for 2 hours, then raise it to 800°C at a rate of 10°C / min, keep it at this temperature for 10h, and then cool it down to room temperature to obtain a lithium ferrous silicate sample.

[0033] figure 1 It is the XRD spectrum of the obtained lithium ferrous silicate. Most of the diffraction peaks in the figure can correspond to the characteristic peaks of lithium ferrous silicate, and there are also a small amount of impurities. figure 2 This is the scanning electron microscope photo of the obtained lithium ferrous silicate. The ...

Embodiment 2

[0036] 2.85g of lithium carbonate, 2.3g of silicon dioxide, 5.4g of ferrous oxalate and 2g of sucrose were mixed and ball milled in ethanol medium for 24 hours. The equipment used was a planetary ball mill with an autopropagation speed of 250r / min. The well-mixed and ground mixed powder was vacuum-dried at 60°C for 24 hours, then pressed into tablets at a pressure of 10MPa, and raised to 400°C at a rate of 10°C / min under the protection of an argon atmosphere of 2L / min. Keep it warm for 2 hours, then raise it to 850°C at a rate of 20°C / min, keep it at this temperature for 15h, and then cool it down to room temperature to obtain a lithium ferrous silicate sample. Test its electrochemical performance according to the method of embodiment 1, as Figure 5 As shown, its first cycle reversible capacity is 142mAh / g.

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Abstract

The invention discloses a method for preparing lithium ferrosilicon silicate of a lithium-ion battery cathode material. After the mixture powder of lithium salts, ferrous salts and silicon dioxide is sufficiently ground, the mixture powder is calcined under inert atmosphere so as to obtain the lithium ferrosilicon silicate lithium-ion battery cathode material. The lithium ferrosilicon silicate material is easily and safely prepared with low cost. The lithium ferrosilicon silicate material obtained by the method has the advantages of low cost, good electrochemical performance, environmental protection, and the like and has wide application prospect in the field of the lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and in particular designs a method for preparing a novel positive electrode material of lithium ion batteries—lithium ferrous silicate. Background technique [0002] Since the advent of lithium-ion batteries in the 1990s, they have been widely used in various portable electronic products due to their high energy density, high power, and good cycle performance. With the development of the global economy, energy issues have become quite prominent, so the research and development of hybrid electric vehicles and electric vehicles has become the focus of the world, and the key technology is lithium-ion battery technology. [0003] The positive electrode material is one of the key materials that determine the performance of lithium-ion batteries. The current commercial positive electrode material is LiCoO 2 dominated, but due to LiCoO 2 Cobalt resources are scarce, expensive, toxic, and...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/58C01B33/20
CPCY02E60/12Y02E60/10
Inventor 刘文刚许云华任冰杨蓉周志斌岑启宏彭建洪王永平
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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