Silicon battery anode material, anode plate for lithium battery and lithium battery prepared thereof

A technology of negative electrode material and carbon negative electrode material, applied in the field of electrochemistry, can solve the problems of short cycle life and low initial efficiency, and achieve the effects of improving electrical conductivity, high charging and discharging efficiency, and simple preparation method

Inactive Publication Date: 2017-06-20
四川国创成电池材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a silicon negative electrode material for a lithium battery, a negative electrode sheet for a lithium battery and a lithium battery prepared therefrom, so as to solve the problems of low initial efficiency and short cycle life in the prior art

Method used

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  • Silicon battery anode material, anode plate for lithium battery and lithium battery prepared thereof
  • Silicon battery anode material, anode plate for lithium battery and lithium battery prepared thereof
  • Silicon battery anode material, anode plate for lithium battery and lithium battery prepared thereof

Examples

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Embodiment 1

[0024] The used silicon negative electrode material Li of the lithium battery of the present embodiment 0.8 SiO 1.2 / C, the specific composition is Li 0.8 SiO 1.2 for 96 copies by Li 4 SiO 4 , Li 2 SiO 3 Composed of LiSi and 4 parts of amorphous carbon layer. Li 0.8 SiO 1.2 / C anode material. The preparation steps are as follows:

[0025] First, weigh and mix spherical silicon, lithium carbonate, lithium iodide, and glucose with a stoichiometric ratio of about 20 nm, and then weigh the ethanol solution according to the mass ratio of the mixed material to the dispersant ethanol of 1:25. After mixing evenly by ball milling, stir and dry, and finally put the dried powder in a tube furnace, roast at 600°C for 12 hours under argon, and cool naturally to obtain the desired Li 0.8 Si / C anode material. figure 1 gives Li 0.8 SiO 1.2 / C XRD patterns.

[0026] The negative electrode sheet used in the lithium battery of this embodiment is composed of a copper foil current c...

Embodiment 2

[0029] The used silicon negative electrode material Li of the lithium battery of the present embodiment 0.6 SiO / C, the specific composition is Li 0.6 SO is 98 parts by Li 4 SiO 4 , Li 2 SiO 3 Composed of LiSi and 2 parts of amorphous carbon layer. Li 0.6 SiO / C anode material. The preparation steps are as follows:

[0030] First, weigh and mix spherical silicon, lithium acetate, lithium iodide, and Tween 80 of about 50nm according to the stoichiometric ratio, and then weigh the ethanol solution according to the mass ratio of the mixed material to the dispersant ethanol of 1:50. After mixing evenly by ball milling, stir and dry, and finally put the dried powder in a tube furnace, roast at 800°C for 6 hours under argon, and cool naturally to obtain the desired Li 0.6 SiO / C anode material.

[0031] The negative electrode sheet used in the lithium battery of this embodiment is composed of a copper foil current collector and a negative electrode layer coated on the current ...

Embodiment 3

[0034] The used silicon negative electrode material Li of the lithium battery of the present embodiment 3 SiO 4.5 / C, the specific composition is Li 3 SiO 4.5 for 96 copies by Li 4 SiO 4 , Li 2 SiO 3 Composed of LiSi and 4 parts of amorphous carbon layer. Li 3 SiO 4.5 / C anode material. The preparation steps are as follows:

[0035] First, weigh and mix silica hollow spheres of about 30nm, lithium hydroxide, and Tween 80 according to the stoichiometric ratio, and then weigh the ethanol solution according to the mass ratio of the mixed material to the dispersant ethanol of 1:10. After mixing evenly by ball milling, stir and dry, and finally put the dried powder in a tube furnace, roast at 1400°C for 1 hour under argon, and cool naturally to obtain the desired Li 3 SiO 4.5 / C anode material.

[0036] The negative electrode sheet used in the lithium battery of this embodiment is composed of a copper foil current collector and a negative electrode layer coated on the cu...

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Abstract

The invention relates to a lithium battery anode material, a lithium battery anode plate and a preparation process of a lithium battery. The silicon anode material has a structural formula of LixSiOy / C and has a core-shell structure composed of a central LixSiOy material and an amorphous carbon layer on the surface, wherein x is 0.05 to 3. The lithium battery anode and the lithium battery provided by the invention are prepared from the LixSiOy / C material as an active material of the anode plate. The LixSiOy / C material prepared by the invention has the advantages of stable structure, high conductivity, excellent reversibility of lithium intercalation and deintercalation, and excellent first efficiency. The lithium battery prepared according to the invention has high discharge capacity and cycling stability.

Description

technical field [0001] The invention relates to a lithium battery silicon negative electrode material, a lithium battery negative electrode sheet and a preparation process for the lithium battery. It belongs to the field of electrochemical technology. Background technique [0002] Since the 1990s, lithium-ion batteries have been widely used due to their advantages such as high operating voltage and high specific energy compared with lead-acid batteries, nickel-cadmium batteries, and nickel-metal hydride batteries. With the advancement of technology, lithium-ion batteries are more and more used in various 3C electronic products and power tools, and people's requirements for them are getting higher and higher. Therefore, it is more and more urgent to develop lithium batteries with high capacity and high power. [0003] The theoretical capacity of carbon anode materials for lithium-ion batteries is only 372mAh / g, and capacity development has reached its limit. In the past te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M4/134H01M4/136H01M4/133H01M10/0525
CPCH01M4/133H01M4/134H01M4/136H01M4/366H01M4/386H01M4/5825H01M4/62H01M4/625H01M10/0525H01M2220/30Y02E60/10
Inventor 王珂陶诗涌
Owner 四川国创成电池材料有限公司
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