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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 reducing the cycle performance of the electrode material.
[0003] Existing silicon anode materials have low coulombic efficiency, large expansion, low cycle retention rate, large polarization, and complex preparation process, so it is difficult to realize commercial application in batteries, which is a technical problem in the field

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
Effect test

Embodiment 1

[0057] 1. Preparation method

[0058] 1.1 Preparation of secondary particles

[0059] Get 100kg of silicon oxide powder (i.e. primary particle, D10=0.60 μm, D50=1.78 μm, D90=3.59 μm, SPAN=1.68, x=1 in SiOx general formula, specific surface area 8.9m 2 / g) and 12kg of coal tar pitch powder were added to the VC mixer, and mixed for 30 minutes at a speed of 16m / s at the maximum diameter of the stirring part, so that the two raw materials were evenly mixed. Subsequently, the rotation speed was reduced to reduce the aforementioned linear velocity to 8m / s, and at the same time, nitrogen gas was introduced as an inert protective gas, and then the temperature was raised at a rate of 3°C / min, and the temperature was raised to 300°C and kept for 4h, and then naturally cooled to room temperature. Complete the granulation process of silicon oxide and pitch. During this process, as the temperature in the VC mixer rises, the asphalt gradually softens, and is evenly coated on the surface o...

Embodiment 2

[0077] The process of Example 2 is similar to Example 1, the difference is that in the material synthesis process, in addition to taking 100kg of silicon oxide powder and 12kg of coal tar 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. The final product is therefore a silica / amorphous carbon composite secondary particle containing conductive additives with a structure such as image 3 As shown, the material is composed of silicon oxide primary particles A, conductive additive C and a carbon layer B that connects and coats the two. The conductive additive C is evenly dispersed inside and outside the secondary particles. D10=1.78μm, D50=3.89μm, D90=7.01μm, SPAN=1.34 of the final product, 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 is 2.9nm.

[0078] The half-cell and full...

Embodiment 3

[0080]Get 100kg of secondary granules made in Example 1, and get 1kg of petroleum pitch powder, add VC mixer, mechanically mix under the condition of line speed 3m / s after 10 minutes, slow down to 2m / s, in nitrogen protection atmosphere The device was heated to 300° C. for 1 h while stirring, and then slowly cooled to room temperature. The above pitch-coated material was kept at 400°C for 2 hours in an argon inert atmosphere, then heated to 900°C for carbonization for 4 hours, naturally cooled to room temperature, crushed, sieved and demagnetized to obtain a second layer of amorphous Carbon coated silica / amorphous carbon composite particles. The final product has D10=2.13μm, D50=4.65μm, D90=7.87μm, SPAN=1.23, and the specific surface area is 2.4m 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-cell evaluation methods are the same as in Example 1, and the resu...

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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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