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Lithium ferrosilicon silicate/carbon composite cathode material and preparation method thereof

A technology of lithium ferrous silicate and positive electrode materials, which is applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of low electrical conductivity and poor high-rate performance, and achieve low cost, improved electrical conductivity, and increased The effect of contact area

Inactive Publication Date: 2010-06-30
CHENGDU ZHONGKE LAIFANG POWER SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But Li 2 FeSiO 4 The electrical conductivity is not high (6×10 at room temperature -14 Scm -1 , 2×10 at 60°C -12 Scm -1 ), leading to its poor high-rate performance, which has become a barrier to its development into a practical high-energy battery, especially in the field of power batteries, which has attracted worldwide attention. The high-rate operating characteristics of lithium-ion batteries determine whether it can be commercially applied. One of the key factors, so increasing Li 2 FeSiO 4 The high-magnification performance has become a hot spot that people pay attention to

Method used

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  • Lithium ferrosilicon silicate/carbon composite cathode material and preparation method thereof
  • Lithium ferrosilicon silicate/carbon composite cathode material and preparation method thereof
  • Lithium ferrosilicon silicate/carbon composite cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Preparation of Example 1 Lithium Ferrous Silicate / Carbon Composite Positive Electrode Material

[0039] Add ferrous oxalate (7.2177g), silicon dioxide (2.4153g), lithium carbonate (2.9705g) and asphalt into a ball mill jar, and after ball milling and mixing in acetone, vacuum dry at 80°C to obtain a precursor. The precursor was pressed into tablets, pre-fired at 350° C. for 5 hours in argon, and then fired at 700° C. for 10 hours to obtain a lithium ferrous silicate / carbon composite positive electrode material. According to the elemental analysis test, the content of carbon in the obtained lithium ferrous silicate / carbon composite positive electrode material is 8.7%. X-ray diffraction pattern see figure 1 , SEM image see figure 2 .

Embodiment 2

[0040] The preparation of embodiment 2 comparative sample ferrous silicate

[0041] Add ferrous oxalate (7.2177g), silicon dioxide (2.4153g) and lithium carbonate (2.9705g) into a ball mill jar, and after ball milling and mixing in acetone, vacuum dry at 80°C to obtain a precursor. The precursor was pressed into tablets, pre-fired at 350° C. for 5 hours in argon, and then fired at 700° C. for 10 hours to obtain a lithium ferrous silicate composite positive electrode material. X-ray diffraction pattern see figure 1 , SEM image see image 3 .

[0042] figure 1 It can be seen that the diffraction peak intensity of the sample obtained in Example 1 is lower than that of the sample obtained in Example 2, and the half width of the diffraction peak is smaller. According to the Scherrer formula, the grain size is inversely proportional to the half-peak width. It can be seen from the following that the crystal grains of carbon-doped lithium ferrous silicate tend to decrease compare...

Embodiment 3

[0044] Example 3 Preparation of Lithium Ferrous Silicate / Carbon Composite Positive Electrode Material

[0045] Add ferrous oxalate (7.5747g), silicon dioxide (2.4153g), lithium carbonate (3.0470g) and asphalt into a ball mill jar, ball mill and mix in acetone, and vacuum dry at 80°C to obtain a precursor. The precursor was pressed into tablets, pre-fired at 350° C. for 5 hours in argon, and then fired at 700° C. for 10 hours to obtain a lithium ferrous silicate / carbon composite positive electrode material. According to the elemental analysis test, the content of carbon in the obtained lithium ferrous silicate / carbon composite positive electrode material is 8.6%.

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Abstract

The invention relates to a lithium ferrosilicon silicate / carbon composite cathode material and a preparation method thereof, belonging to the technical field of lithium-ion battery manufacture. The technical problem to be solved by the invention is to provide a novel path to prepare the ferrosilicon silicate / carbon composite cathode material with high rate performance. The ferrosilicon silicate / carbon composite cathode material of the invention consists of 20-120nm particles which are formed by evenly coating carbon obtained by heated and carbonized asphalt on the surface of the lithium ferrosilicon silicate, wherein the carbon accounts for 2-30% of the lithium ferrosilicon silicate / thecarbon composite cathode material. In the invention, asphalt is utilized to as a carbon source for doping treatment to prepare the lithium ferrosilicon silicate / the carbon composite cathode material for lithium-ion batteries, and the cathode materialhas higher charging-discharging capacity and good circulation property.

Description

technical field [0001] The invention relates to a lithium ferrous silicate / carbon composite positive electrode material and a preparation method thereof, belonging to the technical field of lithium ion battery manufacturing. technical background [0002] With the increasing awareness of environmental protection, the use of toxic metals such as lead and cadmium is increasingly restricted. As the latest generation of storage batteries, lithium-ion batteries have high specific energy, small self-discharge, long cycle life, no memory effect and environmental pollution. Small and other advantages, it has become a strong candidate to replace traditional lead-acid and nickel-cadmium rechargeable batteries. At present, commercialized lithium-ion batteries have been widely used in portable appliances (such as laptops, cameras, and mobile appliances), and the developed large-capacity lithium-ion batteries have begun to be used in electric vehicles, and are expected to become the mains...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397C01B31/02
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 潘中来黄小兵于作龙
Owner CHENGDU ZHONGKE LAIFANG POWER SCI & TECH CO LTD
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