Silica particles for electrode material and preparation method and application of silica particles

An electrode material and particle technology, applied in the field of silicon-oxygen particles and their preparation, can solve the problems of electrolyte consumption, complex preparation process, large polarization, etc., and achieve the effects of reducing lithium ion loss, reducing specific surface area, and increasing the scope of application

Pending Publication Date: 2020-01-21
AMPRIUS NANJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the continuous expansion and contraction of the silicon negative electrode material during the charging and discharging process of the battery and continuous rupture, the resulting fresh interface will form a new SEI film when exposed to the electrolyte, thereby continuously consuming the electrolyte and red

Method used

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  • Silica particles for electrode material and preparation method and application of silica particles
  • Silica particles for electrode material and preparation method and application of silica particles
  • Silica particles for electrode material and preparation method and application of silica particles

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0056] Example 1

[0057] 1. Preparation method

[0058] 1.1 Preparation of secondary particles

[0059] Take 100kg of silicon oxide powder (ie: primary particles, D10=0.60μm, D50=1.78μm, D90=1.59μm, SPAN=1.68, SiOx general formula x=1, specific surface area 8.9m 2 / g) Add 12kg coal pitch powder into the VC mixer, and mix for 30 minutes at a linear speed of 16m / s at the maximum diameter of the mixing part to make the two raw materials evenly mixed. Subsequently, the rotational speed was reduced to reduce the aforementioned linear velocity to 8m / s, while nitrogen was introduced as an inert protective gas, and then the temperature was increased at a rate of 3°C / min. The temperature was raised to 300°C and kept for 4h, and then naturally cooled to room temperature. Complete the granulation process of silica and pitch. During this process, as the temperature in the VC mixer increases, the pitch gradually softens, and it is uniformly coated on the surface of each silicon oxide powder du...

Example Embodiment

[0076] Example 2

[0077] The process of Example 2 is similar to that of Example 1. The difference is that in the process of material synthesis, in addition to taking 100kg of silica powder and 12kg of coal pitch powder into the VC mixer, an additional 0.3kg of Ketjen Black and 0.2 kg of multi-walled carbon nanotube conductive additive powder. Therefore, the final product is silica / amorphous carbon composite secondary particles containing conductive additives, with a structure such as image 3 As shown, the material is composed of primary silicon oxide particles A, a conductive additive C and a carbon layer B connecting and covering the two together. The conductive additive C is uniformly dispersed on the inner and outer surfaces of the secondary particles. The final product D10=1.78μm, D50=3.89μm, D90=7.01μm, SPAN=1.34, and the specific surface area is 3.0m 2 / g, tap density 0.84g / cm 3 , The carbon content is 5.3wt%, and the grain size corresponding to the Si(111) crystal plane ...

Example Embodiment

[0079] Example 3

[0080] Take 100kg of the secondary particles prepared in Example 1, and take 1kg of petroleum pitch powder, add them to the VC mixer, and mix them mechanically at a line speed of 3m / s for 10 minutes, and then reduce the speed to 2m / s. In a nitrogen atmosphere While stirring, the equipment was heated to 300°C and kept for 1 hour, and then slowly cooled to room temperature. The above-mentioned pitch-coated material is kept at 400°C for 2h in an argon inert atmosphere, then heated to 900°C and carbonized for 4h, naturally cooled to room temperature, crushed, sieved and demagnetized to obtain a second layer of amorphous Carbon coated silicon oxide / amorphous carbon composite particles. The final product has D10 = 2.13 μm, D50 = 4.65 μm, D90 = 7.87 μm, SPAN = 1.23, and the specific surface area is 2.4 m 2 / g, tap density 0.95g / cm 3 , The carbon content is 5.8wt%, and the grain size corresponding to the Si(111) crystal plane is 2.9nm.

[0081] The half-cell and full-c...

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Abstract

The present invention relates to silica particles for an electrode material, and the silica particles are characterized in that the silica particles comprise silicon monoxide particles having a general formula SiOx; and a carbon layer, wherein the silicon monoxide particles are bonded by the carbon layer, and the silicon monoxide particles bonded by the carbon layer are coated by the carbon layer.The silica particles are compact, narrow in particle size distribution and small in specific surface area, and have the advantages of high capacity, high coulombic efficiency, low expansion, high cycle retention rate and the like.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a silicon-oxygen particle used as a lithium ion electrode material and a preparation method and application thereof. Background technique [0002] Due to the rapid development and wide application of various portable electronic devices, electric vehicles, and energy storage systems in recent years, the demand for lithium-ion batteries with high energy density and long cycle life has become increasingly urgent. At present, the anode material of commercial lithium-ion batteries is mainly graphite, but due to the low theoretical capacity, the further improvement of the energy density of lithium-ion batteries is limited. Since the silicon anode material has the advantage of high capacity that other anode materials cannot match, it has become a research and development hotspot in recent years, and has gradually moved from laboratory research to commercial application. Among them, the element...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62H01M10/0525
CPCH01M4/483H01M4/628H01M4/625H01M10/0525H01M2004/027H01M4/366Y02E60/10C01B33/113C01P2006/60C01P2006/12C01P2006/11C23C16/26C23C16/4417C01B32/05H01M10/052C01P2004/80H01M4/0428H01M4/48H01M2004/021
Inventor 李喆王岑汪芳张和宝
Owner AMPRIUS NANJING CO LTD
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