Carbon cladding alloy nanometer particle material for lithium ion battery and method for making same

A technology of alloy nanoparticles and lithium-ion batteries, applied in the field of electrochemistry, can solve the problems of reducing the performance of electrode materials, pulverization and peeling, secondary agglomeration, etc., and achieve the effects of excellent cycle performance, growth inhibition, and high specific capacity

Inactive Publication Date: 2008-06-18
FUDAN UNIV
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  • Summary
  • Abstract
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  • 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, and the particles will gradually grow up and then pulverize and peel off, thereby reducing the performance of electrode materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mix 1.3g citric acid and 5g NaBH 4 or KBH 4 Add 600ml deionized water and stir vigorously to dissolve, and weigh another 1.05g CuCl 2 and 1.8g SnCl 4 Dissolve in 20ml aqueous solution, slowly drop into the previous solution under stirring, continue to stir for 10min after the dropwise addition, filter, wash and vacuum dry to obtain nano-Cu 6 sn 5 material, whose particle size is between 10-50nm. The remaining alloy nanoparticles CoSn, Ni 3 sn 4 , etc. are synthesized in the same way. With the nano-alloy material as the negative electrode material, its electrode preparation method is as follows: the ratio of conductive agent: binder: alloy = 5: 10: 85 is mixed with the slurry (here the conductive agent adopts acetylene black or carbon black, and the binder adopts poly Vinylidene fluoride (pvdf)), control a certain thickness and evenly coat the copper foil current collector. Cut electrode sheets of appropriate size, bake in vacuum at 80°C for 12 hours, and then as...

Embodiment 2

[0017] Weigh 2.0g nanometer Cu 6 sn 5 Particles were put into a certain volume of ethanol solution, and 1ml of dodecyl mercaptan was added for ultrasonic treatment for half an hour. Hydrophobized Cu 6 sn 5 After filtering the alloy particles, add them to 100ml of aqueous solution, then add 50ml of formaldehyde, 0.5g of resorcinol and 80mg of sodium lauryl sulfate, and then ultrasonically disperse the mixed solution for half an hour. Then add 0.16g of sodium carbonate to the mixed solution under constant temperature stirring at 70°C, and keep stirring for 12h of polymerization reaction, and finally calcinate the filtered composite material at 600°C for 2h under an inert atmosphere to obtain carbon-coated Cu6 S no 5 Composite material, wherein the content of carbon accounts for 23% of the total mass. The remaining carbon-coated alloy nanoparticles composites CoSn, Ni 3 sn 4 etc. are synthesized in the same way. Using the carbon-coated alloy material as the negative elect...

Embodiment 3

[0019] Weigh 2.0g nanometer Cu 6 sn 5 Particles were put into a certain volume of ethanol solution, and 1ml of dodecyl mercaptan was added for ultrasonic treatment for half an hour. Hydrophobized Cu 6 sn 5 After filtering the alloy particles, add them to 100ml of aqueous solution, then add 50ml of formaldehyde, 0.3g of resorcinol and 80mg of sodium lauryl sulfate, and then ultrasonically disperse the mixed solution for half an hour. Then add 0.16 g of sodium carbonate to the mixed solution under constant temperature stirring at 70 ° C, and keep stirring for 12 h of polymerization reaction, and finally calcinate the filtered composite material at 600 ° C for 2 h under an inert atmosphere to obtain carbon-coated Cu 6 sn 5 Composite material, wherein the content of carbon accounts for 17% of the total mass. Cu coated with this carbon 6 sn 5 The composite material was used as the negative electrode material, and the battery was assembled and tested according to the method d...

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Abstract

The invention belongs to the electrochemical technical field, in particular to a carbon-coated alloy nano-particle electrode material and a preparation method which are used for li-ion batteries. The electrode material body is nano-alloy material; phenolic resins are uniformly coated on the alloy nano-particle to form a core-shell structure by a method of emulsion polymerization, and at last the alloy nano-particle which is coated by the carbon is obtained by high-temperature calcination and carbonization in inertia gas environment. In the structure of the composite material, the nano-alloy particle is uniformly and firmly covered by the carbon which has excellent conductivity and certain expansion contractibility, thereby damping the volume expansion and ensuring the conductivity of the integrated electrode at the same time in the circulation process. By taking the composite material as the material for a cathode material of the li-ion battery, the cathode material of the li-ion battery with high li-content capability, excellent safety and excellent circulation performance can be obtained.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a carbon-coated alloy nanoparticle composite electrode material for a lithium ion battery and a preparation method thereof. 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 a very ur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36B22F1/02H01M4/139
CPCY02E60/10
Inventor 夏永姚李峰罗加严
Owner FUDAN UNIV
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