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Lithium ion battery silicon metal composite negative electrode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems such as capacity fading, and achieve the effects of improving electrical conductivity, stable structure, and good electrochemical stability

Inactive Publication Date: 2015-08-19
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of capacity attenuation caused by the volume expansion of the silicon-metal alloy composite material in the intercalation / delithiation process, so as to realize the high cycle stability of the silicon-metal alloy negative electrode material. For this reason, the present invention provides a novel Structured silicon-metal composite anode materials for lithium-ion batteries

Method used

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  • Lithium ion battery silicon metal composite negative electrode material and preparation method thereof
  • Lithium ion battery silicon metal composite negative electrode material and preparation method thereof
  • Lithium ion battery silicon metal composite negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 140g of Si (100nm), 150g of Ni powder (500 mesh), 50g of glucose and 600g of AGP-8, and knead for 3 hours under a twin-screw extruder with a diameter of 30mm to obtain a mixed precursor.

[0033] Take 20g of the above-mentioned mixed precursor and put it into a ceramic crucible, put the covered ceramic crucible into a high-temperature tube furnace; pump a vacuum and pass high-purity argon; keep it at 1000°C for 1.5h, and the theoretical stoichiometric formula is SiNi 0.511 -10.13C composite anode material.

[0034] The above composite negative electrode material was mechanically ground and sieved through a 325-mesh steel sieve to obtain a powdered silicon-metal composite negative electrode material with a D50 particle size of 4.9 μm. figure 1 The SEM image of the silicon-metal composite negative electrode material shows that nano-silicon particles with smaller particle sizes are distributed in the composite material. image 3 The XRD pattern of the silicon-metal ...

Embodiment 2

[0037] Weigh 240g SiO (350 mesh), 150g Ni powder (500 mesh), 50g glucose and 600g AGP-8, and knead them for 4 hours under a twin-screw extruder with a diameter of 30mm to obtain a mixed precursor.

[0038] Take 20g of the above mixture and put it into a ceramic crucible, put the covered ceramic crucible into a high-temperature tube furnace; evacuate and pass argon; keep it at 1050°C for 1.5h, and the theoretical stoichiometric formula is SiNi 0.47 Composite anode material of O-9.28C.

[0039]The above composite negative electrode material was mechanically ground and sieved through a 325-mesh steel sieve to obtain a powdered silicon-metal composite negative electrode material with a D50 particle size of 8.7 μm.

[0040] figure 2 The SEM image of the silicon-metal composite anode material in the figure shows that the composite material obtained by high-temperature calcination has a good particle size distribution. Figure 4 The XRD pattern of the silicon-metal composite anode...

Embodiment 3

[0042] Weigh 240g SiO (350 mesh), 150g SnO 2 Powder (20nm), 50g of glucose and 600g of AGP-8 were kneaded for 3 hours under a twin-screw extruder with a diameter of 30mm to obtain a mixed precursor.

[0043] Take 20g of the above mixture and put it into a ceramic crucible, put the covered ceramic crucible into a high temperature tube furnace; evacuate and pass argon; keep it warm at 1050°C for 1.5h, and the theoretical stoichiometric formula is SiSn 0.18 o 1.37 -9.28C composite anode material.

[0044] The above composite negative electrode material was mechanically ground and sieved through a 325-mesh steel sieve to obtain a powdered silicon-metal composite negative electrode material with a D50 particle size of 12.3 μm.

[0045] The preparation and testing methods of the battery are the same as in Example 1. The initial reversible capacity of the prepared silicon-metal composite anode material is 462.2mAh / g, and the capacity retention rate after 10 cycles is 97.4%.

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Abstract

The invention discloses a lithium ion battery silicon metal composite negative electrode material and preparation method thereof. The composite negative electrode material is prepared by mutually filling silicon-containing material SiOx and metal oxide-containing material, then coating with amorphous carbon and dispersing in graphite material, wherein x is greater than or equal to 0 and less than or equal to 2, and y is greater than or equal to 0 and less than 4. The stoichiometric equation of the composite negative electrode material is SiMzOw-aC. The preparation method is as follows: (1) weighting a certain amount of a silicon-based SiOx material, a metal oxide-containing material MOy, organic carbon and a graphite precursor raw material for screw extrusion for 0.5-24 h to fully mix the precursor material; and (2) calcining the mixed precursor raw material in a protective atmosphere at 600-1400 DEG C for 0.5-12 h, and performing post-processing to obtain the silicon metal composite negative electrode material. The silicon metal composite negative electrode material has good electrochemical stability. The preparation method is simple, the used equipment is general industrialization equipment, and mass production is easy.

Description

technical field [0001] The invention relates to a silicon-metal composite negative electrode material for a lithium ion battery and a preparation method thereof. Background technique [0002] Since lithium-ion batteries were commercialized by Sony in 1991, with the development of research, lithium-ion batteries have been used in fields requiring mobile power such as laptops, mobile phones, and cameras. In the near future, the development direction of lithium-ion batteries determines that those lithium-ion batteries with high specific energy, long life and low cost that can be applied to the field of electric vehicles will become the focus of research. At present, cathode materials such as lithium manganese oxide (LiMn 2 o 4 ), lithium cobalt oxide (LiCoO 2 ), lithium iron phosphate (LiFePO 4 ) and ternary materials have laid the foundation for this type of battery. However, the specific capacity of commercial negative electrode material carbon is close to the theoretical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38
CPCY02E60/10
Inventor 卢世刚王建涛王耀黄斌杨娟玉谭翱
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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