Nano silicon-carbon composite anode material for lithium ion batteries, and preparation method of nano silicon-carbon composite anode material

A technology of lithium-ion batteries and negative electrode materials, applied in the direction of battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problem of poor charge and discharge efficiency and cycle performance of silicon materials, low conductivity, and solid electrolyte membranes. Instability and other problems, achieve good Coulombic efficiency and cycle performance, solve the expansion problem, and have good application prospects

Active Publication Date: 2018-03-27
洛阳联创锂能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Studies have shown that although elemental silicon is used as a negative electrode material for batteries, although the capacity has been greatly improved, it has disadvantages such as low electrical conductivity, large volume changes in lithium intercalation and delithiation, resulting in pulverization, and the instability of the formed solid electrolyte film, which makes its charge and discharge efficiency and cycle performance relatively low. Poor, hard to get practical application
Although lithium battery research practitioners have made many attempts to improve the practical performance of lithium battery anode materials using silicon, the problems of poor charge and discharge efficiency and cycle performance of silicon materials have not been overcome. Materials and manufacturing methods that meet the practical requirements of cycle performance are already an urgent need of the times

Method used

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  • Nano silicon-carbon composite anode material for lithium ion batteries, and preparation method of nano silicon-carbon composite anode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) First, put 350g of nanocrystalline graphite particles with a particle size D50 of 10nm into a vacuum rotary tube furnace and then perform vacuum treatment; then heat the vacuum rotary tube furnace to 800°C at a speed of 1.8L / min. The silicon source introduced into the vacuum rotary tube furnace decomposes the silicon source into nano-silicon with a particle size of 5-100nm, and the nano-silicon is uniformly coated on the nanocrystalline graphite particles with a shell structure. The amount of deposited silicon reached 525g, and the first precursor was obtained after cooling. Silicon source is SiH 4 、Si 2 h 4 、SiH 3 Cl, SiH 2 Cl 2 , SiHCl 3 and SiCl 4 one or any combination of them.

[0026] 2), firstly mix 875g of the first precursor prepared in step 1) and 875g of carbonaceous binder uniformly in a mixer for 0.8 hours to prepare the mixture of the first precursor and carbonaceous binder, carbonaceous binder It is one or any combination of sucrose, glucose,...

Embodiment 2

[0030] 1) First, put 500g of nanocrystalline graphite particles with a particle size D50 of 50nm into a vacuum rotary tube furnace and then perform vacuum treatment; then heat the vacuum rotary tube furnace to 850°C and pump it at a speed of 1.8L / min. The silicon source introduced into the vacuum rotary tube furnace decomposes the silicon source into nano-silicon with a particle size of 5-100nm, and the nano-silicon is uniformly coated on the nanocrystalline graphite particles with a shell structure. The amount of deposited silicon reached 62.5g, and the first precursor was obtained after cooling. Silicon source is SiH 4 、Si 2 h 4 、SiH 3 Cl, SiH 2 Cl 2 , SiHCl 3 and SiCl 4 one or any combination of them.

[0031] 2), first, 562.5g of the first precursor prepared in step 1) and 62.5g of carbonaceous binder were uniformly mixed in a mixer for 0.9 hours to prepare a mixture of the first precursor and carbonaceous binder, and the carbonaceous binder The binder is one or ...

Embodiment 3

[0035] 1) First, put 500g of nanocrystalline graphite particles with a particle size D50 of 200nm into a vacuum rotary tube furnace and then perform vacuum treatment; then heat the vacuum rotary tube furnace to 900°C and pump it at a speed of 1.9L / min. The silicon source introduced into the vacuum rotary tube furnace decomposes the silicon source into nano-silicon with a particle size of 5-100nm, and the nano-silicon is uniformly coated on the nanocrystalline graphite particles with a shell structure. The amount of deposited silicon reaches 100 g, and the first precursor is obtained after cooling. Silicon source is SiH 4 、Si 2 h 4 、SiH 3 Cl, SiH 2 Cl 2 , SiHCl 3 and SiCl 4 one or any combination of them.

[0036] 2) First, mix 600g of the first precursor prepared in step 1) and 1400g of carbonaceous binder uniformly in a mixer for 0.9 hours to prepare a mixture of the first precursor and carbonaceous binder, carbonaceous binder It is one or any combination of sucrose...

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Abstract

The invention relates to the field of materials for lithium ion batteries, in particular to a nano silicon-carbon composite anode material for lithium ion batteries, and a preparation method of the nano silicon-carbon composite anode material. The nano silicon-carbon composite anode material is prepared from nanocrystalline graphite particles, nano silicon and a carbon binding agent, wherein the nanocrystalline graphite particles and the nano silicon are taken as main lithium storage materials. A nano-silicon shell structure is internally provided with a graphite support and is externally coated with amorphous carbon, thus solving the problem of poor silicon conductivity. Therefore, the nano silicon-carbon composite anode material has better coulombic efficiency and cycling performance while meeting the requirement of high capacity, thus having good application prospect.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a nano-silicon-carbon composite negative electrode material for lithium-ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in electronic devices due to their high energy density and high working voltage. At the same time, they are also being widely used in electric vehicles and electric energy storage, bringing great convenience to people's lives. Conversely, the further widespread application of lithium-ion batteries requires a further increase in the energy density and operating voltage of lithium-ion batteries. [0003] At present, commercial lithium-ion batteries mainly use graphite and modified graphite as negative electrode materials, which have been developed relatively maturely, and the actual product capacity is close to its theoretical capacity of 372mAh / g. As a negative electrode materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/386H01M4/583H01M4/621H01M10/0525Y02E60/10
Inventor 陈志强高贵华
Owner 洛阳联创锂能科技有限公司
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