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Method of manufacturing composite anode material and composite anode material applied to lithium secondary battery

A lithium secondary battery and negative electrode material technology, applied in secondary batteries, battery electrodes, lithium storage batteries, etc., can solve the problems of high price of silicon nanoparticles, achieve the effect of solving volume changes, reducing resistance, and reducing production costs

Active Publication Date: 2020-10-20
DECA MATERIAL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, due to the problem of the very high price of silicon nanoparticles in the preparation of silicon nanoparticles, although the technology for reducing the preparation cost of silicon nanoparticles has been developed, there are limitations in the preparation of low-cost silicon-based composite anode materials because they are prepared by Silicon nanoparticles are then compounded in two steps (Korean authorized patent 10-1500994)

Method used

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  • Method of manufacturing composite anode material and composite anode material applied to lithium secondary battery
  • Method of manufacturing composite anode material and composite anode material applied to lithium secondary battery
  • Method of manufacturing composite anode material and composite anode material applied to lithium secondary battery

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Experimental program
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Effect test

Embodiment 1

[0056] Composite anode materials were prepared using carbon fibers prepared by electrospinning and 325-mesh micro-silicon particles. The 325-mesh micro-silicon particles use commonly used products and are composed of particles smaller than 42 μm, so they have a size of micron units. Carbon thermal shock was applied to the carbon fiber dip-coated in ethanol with 5% concentration of microsilicon particles, and the carbon thermal shock condition was to apply a current of 53A under the voltage condition of 120V for 1 second.

[0057] image 3 This is a photograph of simply mixing carbon fiber and micro silicon particles before applying carbon thermal shock, Figure 4 It is a photograph of the state after carbon thermal shock was applied.

[0058] Before applying carbon thermal shock, a state where silicon particles having a size in units of micrometers and carbon fibers prepared by electrospinning were simply mixed could be confirmed.

[0059] However, after the carbon thermal ...

Embodiment 2

[0061] Composite anode materials were prepared by using expanded graphite flakes and 325-mesh micro-silicon particles. After dip-coating on phenolic resin dispersed with 6% micro-silicon particles, dry it in the atmosphere for 24 hours, then stabilize it to ensure that the residual carbon remains as a solid component in a nitrogen atmosphere at 350 ° C, and then check the expansion Carbon thermal shock is applied to the graphite sheet, and the carbon thermal shock condition is to apply a current of 95 A for 30 seconds at a voltage of 220 V. The silicon particles are brought into contact with the graphite flakes, while residual carbon remains as a solid component, so that the thermal energy of the rapidly heating graphite flakes can be sufficiently transferred to the silicon particles.

[0062] Figure 5 This is a photograph of a case where expanded graphite flakes and micro-silicon particles are simply mixed before carbon thermal shock is applied, Figure 6 is a photograph o...

Embodiment 3

[0072] Composite anode materials were prepared by using natural graphite and 325-mesh micro-silicon particles.

[0073] After mixing natural graphite and micro-silicon particles at a weight ratio of 8:2 and pressing and molding, carbon thermal shock was applied, and the carbon thermal shock condition was applied at a voltage of 150V and a current of 57A for 10 seconds.

[0074] Figure 9 It is a photo of the case where natural graphite and micro-silicon particles are mixed and pressed before applying carbon thermal shock, Figure 10 It is a photograph of the surface of natural graphite after carbon thermal shock is applied.

[0075] Not all of the microsilicon particles mixed with natural graphite were melted, but it was confirmed that some of the silicon particles were melted and impregnated in the form of particles on the surface of natural graphite by carbon thermal shock.

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Abstract

Disclosed is a method of manufacturing a composite anode material for a lithium secondary battery containing nano-sized silicon and a carbonaceous material through a single process, the method including mixing a carbonaceous material and solid silicon and performing carbothermal shock for rapidly heating the carbonaceous material so that the solid silicon is melted using the heated carbonaceous material and is dispersed and attached in the form of particles to the surface of the carbonaceous material, the size of the silicon particles, which grow on the surface of the carbonaceous material, being adjusted during the carbothermal shock. Accordingly, processing costs can be lower than conventional methods of manufacturing silicon nanoparticles, and manufacturing costs can be further reducedby simultaneously performing formation of the silicon nanoparticles and compounding with the carbonaceous material.

Description

technical field [0001] The present invention relates to a method of using silicon to prepare an active material for a lithium secondary battery, and more specifically, to a method of preparing a composite negative electrode material compounded with nano-sized silicon and carbon-based materials. Background technique [0002] Recently, the demand for lithium secondary batteries has greatly increased as a power supply device for personal portable terminal devices such as mobile phones, smartphones, and tablet computers, or electric vehicles such as hybrid electric vehicles and plug-in electric vehicles. Rapid charging of negative and positive electrode materials used in the past for lithium secondary batteries, and development of high-power and high-energy-density active materials. [0003] In the case of the negative electrode, the theoretical capacity of graphite used in most commonly used lithium secondary batteries is 372mAh / g level. Due to the slow interlayer diffusion rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/625H01M4/386H01M10/052Y02E60/10C01B32/21H01M4/1393H01M4/1395B82Y40/00H01M2004/027H01M4/0471H01M4/366H01M4/364H01M4/483H01M4/587C01B33/02C01B33/113C01B32/198D01F9/22H01M10/0525
Inventor 曹昌铉禹昶世梁甲承任昌夏赵忠衡
Owner DECA MATERIAL INC
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