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Electric pole material of natural modified spherical mineral carbon load nano particle and preparation method thereof

A spherical graphite and electrode material technology, applied in the field of electrochemical materials, can solve the problems of secondary agglomeration, reduced electrode material performance, pulverization and peeling, etc., and achieves the effects of high specific capacity, good cycle performance and small particle size

Inactive Publication Date: 2008-04-09
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then, the volume expansion of nano-scale alloy materials during the cycle will also cause secondary agglomeration of nanoparticles. After the particles grow gradually, they will be pulverized and peeled off, which reduces the performance of electrode materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] With natural modified spherical graphite MSG as negative electrode material, its electrode preparation method is as follows: Conducting agent: binding agent: the ratio mixing slurry of graphite (MSG)=5: 10: 85 (conducting agent adopts acetylene black or carbon black here , the binder is polyvinylidene fluoride (pvdf), and a certain thickness is controlled and evenly coated on the copper foil current collector. Cut electrode sheets of appropriate size, bake in vacuum at 80°C for 12 hours, and then assemble them in the order of positive electrode / separator / negative electrode in a glove box for single-electrode testing. Single electrode test with lithium sheet as negative electrode, 1M LiPF 6 - EC / DMC (volume ratio 1:1) is the electrolyte, and the separator is a commercial lithium-ion battery separator, assembled into a button battery (CR2016). The working range of the battery is 0-2.0V, the charge and discharge current is 100mA / g, the measured initial discharge capacity ...

Embodiment 2

[0014] Mix 1.3g citric acid and 5g NaBH 4 or KBH 4 Add 200ml of ethanol and 600ml of deionized water to the mixed solution and stir vigorously to dissolve, and weigh 1.05g of CuCl 2 and 1.800g SnCl 4 Dissolve in 20ml aqueous solution, slowly drop NaBH under stirring 4 solution, continue to stir for 10 min after the dropwise addition, filter, wash and vacuum dry to obtain nano-Cu 6 sn 5 material, whose particle size is between 20-50nm. Nano Cu 6 sn 5 As the negative electrode material, the battery was assembled according to the method described in Example 1. The initial discharge capacity of the alloy material can reach 792mAh / g, but the irreversible capacity in the first cycle is relatively large (350mAh / g), and its cycle performance is poor, and the capacity after 30 cycles is only 223mAh / g. Compared with natural graphite MSG, nano Cu 6 sn 5 There is no obvious discharge platform, and the charge and discharge curves are all inclined curves between 0-2V (see Table 1 ...

Embodiment 3

[0016] Add 9.0g of natural modified graphite MSG into the mixed solution of 200ml of ethanol and 600ml of deionized water, ultrasonically disperse for 30min, add 1.3g of citric acid and 5g of NaBH 4 or KBH 4 Stir vigorously in the solution to dissolve, and weigh another 1.05g CuCl 2 and 1.80g SnCl 4 Dissolve in 20ml aqueous solution, slowly drop MSG and NaBH under stirring 4 In the mixed solution, continue to stir for 10 minutes after the dropwise addition, filter, wash and vacuum dry to obtain the natural modified graphite MSG loaded nano-Cu 6 sn 5 Particle composite material, its loading is 10wt%, the loaded Cu 6 sn 5 The particle size is between 10-30nm. Using this composite material as the negative electrode material, a battery was assembled according to the method described in Example 1. The first-time discharge capacity of the composite material can reach 526mAh / g, the second-cycle discharge capacity is 404mAh / g, and the first-cycle irreversible capacity is 122mAh...

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Abstract

The invention relates to a composite electrode material of natural modified spherical graphite (MSG)-loading nano-Cu6Sn5 and a fabrication method thereof. The main body of the electrode material is natural modified spherical graphite (MSG), and the particle surface of the main body material loads Cu6Sn5 alloy particles in the scale of nanometer. In the structure of the composite material, Cu6Sn5 nanoparticles are fixedly loaded on the surface of graphite, which buffers the volume expansion as well as ensures the conductivity in the process of recirculation, and the surface of graphite has Cu6Sn5 nanoparticles of high specific capacity, which enhances the capacity of entire electrode materials. By using the present composite material as negative materials of Li-ion batteries, the negative materials of Li-ion batteries can be obtained with high-capacity Li-storage, excellent security and good circulation.

Description

technical field [0001] The invention belongs to the technical field of electrochemical materials, in particular to a kind of natural modified spherical graphite loaded nano-Cu 6 sn 5 Particle composite electrode material and its preparation method. Background technique [0002] With the continuous development of the economy, it will inevitably lead to the depletion of natural resources such as oil and coal, environmental pollution and the aggravation of the global greenhouse effect. Human beings must grasp the balance between the "three Es" of the trinity of economic growth, environmental protection and energy supply. Now the world's annual energy consumption converted into oil is about 8 billion tons, of which 90% are fossil fuels. According to the current consumption rate, it will be exhausted in about 100 to 200 years. The comprehensive and efficient development and utilization of new energy, energy-saving technology and environmental protection technology has become ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/36H01M4/04B01J8/00B01J19/00H01M4/136H01M4/58
CPCY02E60/12Y02E60/10
Inventor 夏永姚李峰
Owner FUDAN UNIV
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