Micro-sphere compound anode material with core-shell structure and preparation method thereof

A technology of negative electrode material and core-shell structure, which is applied in the field of core-shell structure composite microsphere negative electrode material and its preparation for lithium ion secondary battery or power energy, and can solve the problem that the electrochemical cycle performance does not meet the ideal requirements and the composite material structure Unsatisfactory, poor cycle performance of electrode materials, etc., to achieve the effect of easy operation, low cost, and improved structure

Inactive Publication Date: 2011-08-31
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pure silicon is accompanied by a volume expansion effect of up to 3 times during the deintercalation process, which produces a large mechanical stress, which leads to the gradual powdering and falling off of the electrode material, and the conductive network in the electrode material is gradually interrupted. Therefore, the cycle performance of the electrode material poor
At present, the research on the modification of silicon-based electrode materials mainly includes the use of chemical vapor deposition to deposit amorphous carbon on silicon mat

Method used

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  • Micro-sphere compound anode material with core-shell structure and preparation method thereof
  • Micro-sphere compound anode material with core-shell structure and preparation method thereof
  • Micro-sphere compound anode material with core-shell structure and preparation method thereof

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Embodiment 1

[0032] Preparation of core-shell structure microsphere composite anode material: the raw materials of the composite material silicon microspheres, Li 1+x V 1-x o 2 Synthetic raw materials (Li 2 CO 3 , V 2 o 3 ), CuO and polyvinyl alcohol according to the mass ratio of 65:20:10:5 to weigh the total mass of 50 grams, Li 1+x V 1-x o 2 The synthesis raw material molar ratio is 1.08:0.92 Li 2 CO 3 , V 2 o 3 10 grams of the mixture was dissolved in constant temperature deionized water at 50°C, and 2.5 grams of polyvinyl alcohol was added, and ultrasonically dispersed, and then 32.5 grams of silicon microspheres and 5 grams of CuO were added. The ultrasonic dispersion time was 2 hours, and then in an argon atmosphere Carbonization at 200°C for 3 hours, and synthesis at 950°C for 5 hours to obtain silicon microspheres as the core to intercalate Li 1.08 V 0.92 o 2and CuO porous amorphous carbon as the core-shell structure composite anode material.

[0033] Electrode prep...

Embodiment 2

[0035] Preparation of core-shell structure microsphere composite anode material: the raw materials of the composite material silicon microspheres, Li 1+x V 1-x o 2 Synthetic raw materials (Li 2 CO 3 , V 2 o 3 ), Co 3 o 4 and polyvinyl alcohol in a mass ratio of 50:30:12:8 to weigh a total mass of 50 grams, Li 1+x V 1-x o 2 The synthesis raw material molar ratio is 1.02:0.98 Li 2 CO 3 , V 2 o 3 15 grams of the mixture was dissolved in constant temperature deionized water at 50°C, and 4 grams of polyvinyl alcohol was added, ultrasonically dispersed, and then 25 grams of silicon microspheres and 6 grams of Co 3 o 4 , ultrasonically dispersed for 2 hours, then carbonized at 300°C for 2 hours in an argon atmosphere, and then synthesized at 850°C for 6 hours to obtain silicon microspheres as cores to intercalate Li 1.02 V 0.98 o 2 and Co 3 o 4 The core-shell structure composite anode material of porous amorphous carbon as the shell.

[0036] The preparation and p...

Embodiment 3

[0038] Preparation of core-shell structure microsphere composite anode material: the raw materials of the composite material silicon microspheres, Li 1+x V 1-x o 2 Synthetic raw materials (Li 2 CO 3 , V 2 o 5 ), SnO 2 and polyvinyl alcohol in a mass ratio of 70:20:6:4 and weighed 50 grams of the total mass, Li 1+x V 1-x o 2 The synthesis raw material molar ratio is 1.1:0.9 Li 2 CO 3 , V 2 o 5 10 grams of the mixture was dissolved in constant temperature deionized water at 50°C, and 2 grams of polyvinyl alcohol was added, ultrasonically dispersed, and then 35 grams of silicon microspheres and 3 grams of SnO 2 , the ultrasonic dispersion time is 2 hours, and then carbonized at 300°C for 2 hours in an atmosphere of a mixed gas with a volume ratio of 10% hydrogen and 90% argon, and then synthesized at 1000°C for 8 hours to obtain silicon microspheres as the core. Li 1.1 V 0.9 o 2 and SnO 2 The core-shell structure composite anode material of porous amorphous carbo...

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Abstract

The invention discloses a micro-sphere compound anode material with a core-shell structure and a preparation method thereof. The compound anode material is a compound micro-sphere with the core-shell structure; the material of the core is a silicon micro-sphere; and the material of the shell layer is formed by uniformly embedding Li1+xV1-xO2 and oxide cathode or metal anode materials in amorphousporous carbon. The preparation method of the compound anode material comprises the following steps of dissolving a lithium source and a vanadium source in deionized water at a constant temperature; adding macromolecule glue and uniformly dispersing by adopting ultrasonic wave; slowly adding in the glue state phase when dispersing the silicon micro-sphere and the oxide cathode or the metal anode material by adopting the ultrasonic wave; and then sequentially carbonizing and combining in the inertia or reducing atmosphere to obtain the core-shell structured compound micro-sphere taking the silicon micro-sphere as the core and the porous amorphous carbon as the shell. The discharging ratio capacity is more than 980mA h/g when the compound micro-sphere material is used at the cathode of the lithium ion battery. And the charging and discharging efficiency at the first time is more than 85%; the capacity conservation rate is more than 92% after the micro-sphere compound anode material is recycled for 500 times.

Description

technical field [0001] The invention relates to a microsphere composite negative electrode material with a core-shell structure and a preparation method thereof, in particular to a core-shell structure composite microsphere negative electrode material for lithium ion secondary batteries or power energy sources and a preparation method thereof. Background technique [0002] At present, the lack of energy in the world and the deterioration of the environment have promoted the development and utilization of green and environmentally friendly new energy with excellent performance and low price. The development and utilization of energy materials has become an urgent issue in today's society. Under this premise, lithium-ion batteries have quickly become a research and development hotspot due to their environmental friendliness, high working voltage, high specific energy, and long cycle life. The government's strong support policies for the development of electric vehicles and the...

Claims

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Application Information

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IPC IPC(8): H01M4/70H01M4/1397
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 陈晗张优良陈艺锋刘建华胡忠良向楷雄龚文强
Owner HUNAN UNIV OF TECH
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