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Preparation method of negative pole material of lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as difficulty in synthesis, and achieve the effects of easy synthesis, low temperature and short sintering time

Inactive Publication Date: 2013-04-24
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is very difficult to synthesize

Method used

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  • Preparation method of negative pole material of lithium ion battery
  • Preparation method of negative pole material of lithium ion battery
  • Preparation method of negative pole material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh the Co with a mass ratio of 1:3 2 o 3 8.293 grams and H 3 BO 3 9.275 grams, grind, mix evenly, add 10mL of deionized water, stir evenly, adjust flow and change phase. Transfer it into a sealed container and let it stand at 80°C for 2 hours for rheological phase treatment. Then transfer it to a ball mill jar, add 20 mL of ethanol, and ball mill at a rate of 200 rpm for 4 hours, then dry, grind, put it into a corundum crucible, and raise the temperature to 800 °C at a rate of 4 °C / min under an oxygen atmosphere. Keep it at ℃ for 6 hours, turn off the power, cool with the furnace, soak the obtained product in hot deionized water for 10 minutes, wash, filter, and dry at 80-150℃ to obtain cobalt borate material.

[0033] The XRD spectrum of the sample is as figure 1 , compared with the standard spectrum, except that two diffraction peaks cannot be assigned, and Mg 2 B 2 o 5 Spectra (PDF card No.16-168) are identical, indicating that the synthesized material is ...

Embodiment 2

[0036] Weigh 7.493 grams of CoO and H with a mass ratio of 1:4 3 BO 312.368 grams, grind, mix evenly, add 13mL of deionized water, stir evenly, adjust flow and change phase. Transfer it into a sealed container and let it stand at 90°C for 1 hour to perform rheological phase treatment. Then transfer it to a ball mill jar, add 20 mL of isopropanol, and ball mill it at a rate of 200 rpm for 4 hours, then dry it, grind it, put it into a corundum crucible, and heat it up at a rate of 4°C / min under an oxygen atmosphere. Keep it at 850°C for 3 hours, turn off the power, cool with the furnace, soak the obtained product in hot deionized water for 1 hour, wash, filter, and dry at 80-150°C to obtain the cobalt borate material. The test conditions of the battery are the same as in Example 1, and the discharge and charge specific capacities of the first cycle are 1018mAh / g and 579mAh / g respectively.

Embodiment 3

[0038] Weigh the Co with a mass ratio of 1:1.3 2 o 3 8.293 grams and B 2 o 3 4.525 grams, grind, mix evenly, add 8mL of deionized water, stir evenly, adjust flow and change phase. Transfer it into a sealed container, and let it stand at 100° C. for 0.5 hour for rheological phase treatment. Then transfer it to a ball mill jar, add 15 mL of acetone, and ball mill at a rate of 180 rpm for 5 hours, then dry, grind, put it into a corundum crucible, and raise the temperature to 850 °C at a rate of 4 °C / min in an oxygen atmosphere. Keep at ℃ for 3 hours, turn off the power, cool with the furnace, soak the obtained product in hot deionized water for 2 hours, wash, filter, and dry at 80-150℃ to obtain the cobalt borate material. The test conditions of the battery are the same as in Example 1, and the discharge and charge specific capacities of the first cycle are 1029mAh / g and 562mAh / g respectively.

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Abstract

The invention discloses a preparation method of a negative pole material, namely cobaltous borate, of a lithium ion battery. The molecular formula of the cobaltous borate provided by the invention is Co2B2O5. The preparation method comprises the following steps of: grinding and uniformly mixing raw materials, regulating a rheological phase, carrying out rheological phase treatment on the materials in an enclosed container at 60-150 DEG C, carrying out liquid phase ball milling on the materials, drying and crushing the materials, sintering the materials in oxygen or air atmosphere at 700-900 DEG C for 3-8 hours, immersing the obtained product by hot deionized water, washing and filtering the product, and drying the product at 80-150 DEG C, thereby obtaining the Co2B2O5. According to the invention, the electrochemical performance of the Co2B2O5 is tested firstly under the conditions of 25mA / g current density and 0.01V-3.00V voltage at a room temperature, and the test prove that the material has two wide platforms on a primary discharge curve, wherein the two wide platforms are respectively positioned at 0.83V and 0.75V, and the specific capacities of discharge and charge of a primary coil are respectively 1048mAh / g and 587mAh / g.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a lithium ion battery, belonging to the technical field of batteries. Background technique [0002] In 1997, Japan's Miyasaka and others first synthesized the amorphous substance Sn as the negative electrode material of lithium-ion batteries. 1.0 B 0.56 P 0.40 Al 0.42 o 3.6 , the material exhibits a reversible capacity greater than 600 mAh / g and has good cycle stability in the first 100 weeks. This report has aroused people's attention and research on borates as Li-ion electrode materials. Gejke et al synthesized tin borate SnB 2 o 4 The negative electrode material can maintain a capacity of 530mAh / g after 40 cycles at a cycle voltage of 0.01-0.8V. In 2001, Nazar et al. studied iron borate FeBO for the first time 3 and Fe 3 BO 6 electrochemical performance. Iron borate has reversible lithium-deintercalation properties at lower voltages, and can be used as a ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 纪效波潘成迟杨应昌陈启元李叙
Owner CENT SOUTH UNIV
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