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SiOx-based composite material, preparation method and lithium ion battery

A composite material, nano-conducting technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as poor cycle performance, poor rate performance, and ineffective solution of material volume expansion.

Active Publication Date: 2014-06-11
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The negative electrode material has a discharge capacity of 2010-2640mAh / g for the first time at a rate of 0.1C, and 420-790mAh / g after 50 cycles. The cycle performance is poor. At the same time, the micron-scale particles of the material rely solely on Si and SiO 2 Electrical conduction, poor electrical conductivity and long transmission path make the rate performance poor. At the same time, the structural material does not effectively solve the volume expansion problem of the material itself.

Method used

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  • SiOx-based composite material, preparation method and lithium ion battery
  • SiOx-based composite material, preparation method and lithium ion battery
  • SiOx-based composite material, preparation method and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075]SiO 1.1 Put it into a superheated steam pulverizer and pulverize until the median particle size is 2.0-20.0μm, then add it to a stirring ball mill (zirconia is the ball milling medium), add alcohol solvent, control the solid content at 5.0-40.0wt%, and the ball-to-material ratio is 5.0 ~20.0wt%, rotational speed 100~400rpm, ball milling 2.0~50.0h, get nano-SiO with median particle size 300~500nm 1.1 particles;

[0076] in nano-SiO 1.1 Add 10.0wt% citric acid and 2.0wt% nano-conductive carbon powder with a median particle size of 80-150nm to the particles (alcohol system), and control the atomizer frequency of the spray dryer to 50.0-90.0Hz and the speed to 10000-25000rpm ; The temperature of the feed inlet is 140.0-180.0°C, the temperature of the discharge port is 90.0-120.0°C, spray dry, and then put it in a rotary furnace and pass in argon protective gas to raise the temperature to 500.0°C at 0.5°C / min, and keep it for 10.0h , naturally cooled to room temperature, a...

Embodiment 2

[0080] SiO 0.5 Put it into a balloon pulverizer and pulverize until the median particle size is 2.0-15.0 μm, then put it into a sand mill (zirconia is the ball milling medium), add alcohol solvent, control the solid content at 5.0-40.0wt%, and the ball-to-material ratio is 5.0 ~20.0wt%, rotational speed 500~1500rpm, ball milling 2.0~50.0h, get nano-SiO with median particle size 30~100nm 0.5 particles;

[0081] in nano-SiO 0.5 Add 10.0wt% phenolic resin and 1.0wt% nano-conductive graphite powder with a median particle size of 100-300nm to the particles (alcohol system), and control the atomizer frequency of the spray dryer to 50.0-90.0Hz and the speed to 10000-25000rpm The temperature at the feed inlet is 140.0-180.0°C, the temperature at the outlet is 90.0-120.0°C, spray-dried, and then placed in a roller kiln and fed with a mixture of argon and hydrogen at a rate of 20.0°C / min to raise the temperature to 1150.0°C. Insulate for 0.5h, cool naturally to room temperature, and ...

Embodiment 3

[0085] SiO 1.3 Put it into an ultra-low temperature pulverizer and pulverize until the median particle size is 2.0-15.0 μm, then add it to a planetary ball mill (zirconia is the ball milling medium), add alcohol solvent, control the solid content at 5.0-40.0wt%, and the ball-to-material ratio is 5.0- 20.0wt%, rotating speed 200-800rpm, ball milling for 5.0-20.0h, to obtain nano-SiO with a median particle size of 100-300nm 1.3 particles;

[0086] in nano-SiO 1.3 Add 5.0wt% asphalt, 6.0-10.0 times the tetrahydrofuran solution of asphalt mass and 1.0wt% carbon nanotubes with a median particle size of 80-300nm to the granules (alcohol system), and control the atomizer frequency of the spray dryer to 50.0 ~90.0Hz, rotating speed 10000~25000rpm; feed inlet temperature 140.0~180.0℃, discharge outlet temperature 90.0~120.0℃, spray dry, then place in a tube furnace and feed a mixture of argon and hydrogen to 3.0°C / min to raise the temperature to 850.0°C, keep it warm for 4.5h, natur...

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Abstract

The invention relates to a SiOx-based composite material, a preparation method and a lithium ion battery. The SiOx-based composite material comprises a SiOx / C material, wherein the SiOx / C material comprises SiOx nano particles, organism cracked carbon, nano conductive particles and amorphous conductive carbon layers, the SiOx nano particles, the organism cracked carbon and the nano conductive particles are wrapped in the amorphous conductive carbon layers, the SiOx / C material is in a spherical shape and comprises a porous structure, and x is more than or equal to 0.5 and less than or equal to 1.3. The composite material is used as a negative electrode material of the lithium ion battery, excellent in cycling performance, excellent in rate performance and low in size expansion effect, applicable to the fields such as top-grade digital electrons, electric tools and next-generation vehicle-mounted devices and wide in market prospect.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular, the invention relates to a SiO x A matrix composite material and a preparation method thereof, and a lithium ion battery using the composite material. Background technique [0002] At present, more than 90% of the mainstream products of commercial lithium-ion battery anode materials are graphite-based carbon materials, such as artificial graphite, natural graphite and mesocarbon microspheres. However, the low specific capacity (372mAh / g) of carbon-based anode materials makes it difficult to keep up with the pace of miniaturization of electronic equipment, high-power and high-capacity lithium-ion batteries for vehicles and electric tools. Therefore, there is an urgent need to develop new anode materials for lithium-ion batteries that can replace carbon materials with high energy density, high safety performance, and long cycle life. [0003] Tr...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00
CPCY02E60/122B82Y30/00H01M4/362H01M4/48H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 岳敏余德馨任建国李胜黄友元
Owner BTR NEW MATERIAL GRP CO LTD
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