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Low-oxygen-content porous silicon composite powder material as well as preparation and application thereof

A composite material, porous silicon technology, used in the preparation/purification of silicon oxide and carbon, electrical components, etc., can solve the problems of poor cycle performance and low first efficiency of silicon oxide anode materials, and achieve excellent cycle stability, The effect of improving electrochemical performance and excellent first-lap efficiency

Active Publication Date: 2020-12-08
湖南宸宇富基新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art and improving the poor cycle performance of silicon negative electrode materials and the low efficiency of silicon oxide negative electrode materials for the first time, the first purpose of the present invention is to provide a low-oxygen silicon composite negative electrode active material with a porous structure, Designed to improve electrochemical performance such as first-time efficiency and cycle stability

Method used

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  • Low-oxygen-content porous silicon composite powder material as well as preparation and application thereof
  • Low-oxygen-content porous silicon composite powder material as well as preparation and application thereof
  • Low-oxygen-content porous silicon composite powder material as well as preparation and application thereof

Examples

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Embodiment 1

[0063] Using SiO coarse powder with an average particle size of 5 mm as raw material, after crushing and crushing, SiO fine powder with an average particle size of 8 μm is obtained; chemical vapor deposition method is used, acetylene is used as raw material gas, hydrogen is used as carrier gas, and the deposition temperature is 650 ° C , the holding time is 1h, the gas flow rate is 150ml / min of acetylene, and 50ml / min of hydrogen, and a thin carbon layer is coated on the surface of the SiO fine powder to obtain silicon monoxide particles (SiO@C) wrapped with a thin layer of carbon; SiO@C particles , metal Mg, non-metal B powder, mixed salt (LiCl:NaCl molar ratio 7:3, eutectic point 570°C) according to the mass ratio of 1:0.2:0.05:1, mixed and granulated by extrusion granulation method to obtain Composite precursor: put the composite precursor into a sintering boat and place it in a muffle furnace, and carry out sintering reaction under an argon atmosphere, at a rate of 5°C / min,...

Embodiment 2

[0067] Using SiO coarse powder with an average particle size of 0.5 mm as raw material, after crushing and crushing, SiO fine powder with an average particle size of 1 μm is obtained; chemical vapor deposition method is used, methane is used as raw material gas, argon is used as carrier gas, and the deposition temperature is at 550°C, holding time 1h, gas flow rate of acetylene 80ml / min, argon 20ml / min, coating a thin carbon layer on the surface of SiO fine powder to obtain silicon monoxide particles (SiO@C) wrapped in a thin layer of carbon; SiO @C particles, metallic Mg, non-metallic B powder, mixed salt (LiCl:NaCl molar ratio 7:3, eutectic point 570°C) were mixed and granulated by extrusion granulation according to the mass ratio of 1:0.2:0.05:1 pellets to obtain a composite precursor; put the composite precursor into a sintering boat and place it in a muffle furnace for sintering reaction under an argon atmosphere, and heat up to 700°C at a speed of 5°C / min, react for 6 hou...

Embodiment 3

[0070] Using SiO coarse powder with an average particle size of 10mm as raw material, after crushing and pulverizing, SiO fine powder with an average particle size of 16 μm is obtained; chemical vapor deposition method is used, acetylene is used as raw material gas, and the mixed gas of argon and hydrogen (volume ratio 9:1) is the carrier gas, the deposition temperature is 850°C, the holding time is 2h, the gas flow rate is 240ml / min of acetylene, the mixed gas of argon and hydrogen (carrier gas) is 80ml / min, and a thin carbon layer is coated on the surface of SiO fine powder , to obtain silicon monoxide particles wrapped in thin carbon (SiO@C); SiO@C particles, metal Mg, non-metal B powder, mixed salt (LiCl:NaCl molar ratio 7:3, eutectic point 570°C) according to 1 : The mass ratio of 0.2:0.05:1 is mixed and granulated by extrusion granulation to obtain a composite precursor; At a rate of 5°C / min, heat up to 700°C, react for 6 hours, and after natural cooling, wash the water-...

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Abstract

The invention belongs to the technical field of lithium-ion battery materials, and particularly discloses a low-oxygen-content porous silicon composite material which comprises an inner core and a shell compounded on the surface of the inner core, wherein the inner core is locally non-crystallized silicon SiOy with a low oxygen-containing porous structure; the shell is a thin carbon coating layer;wherein y is larger than 0 and smaller than 1; and the thickness of the thin carbon coating layer is not more than 100nm. In addition, the invention also discloses a preparation method of the material. Research finds that the composite material has the characteristics of large reversible capacity, excellent rate capability, high first efficiency, stable circulation and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium battery electrode materials, and in particular relates to a low-oxygen porous silicon composite powder material and a preparation method thereof. Background technique [0002] At present, the anode materials of commercial lithium-ion batteries mainly use graphite materials, and the theoretical capacity of graphite is low, which limits the further improvement of the energy density of lithium-ion batteries. Silicon has become the mainstream of research on new anode materials due to its high theoretical capacity (more than ten times the theoretical capacity of graphite), good safety performance and wide range of sources. However, the huge volume expansion and low intrinsic conductivity of silicon during the charge-discharge process lead to poor cycle and rate performance of the battery. Among silicon compounds, silicon monoxide (SiO) has a higher theoretical specific capacity and can react with lith...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62H01M10/0525C01B32/05C01B33/113
CPCH01M4/483H01M4/625H01M10/0525C01B33/113C01B32/05Y02E60/10
Inventor 周昊宸周向清王鹏周进辉
Owner 湖南宸宇富基新能源科技有限公司
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