Nanometer hybrid material integrating positive/negative cyclic effects and preparation method thereof

A nano-hybrid material and effect technology, applied in the field of materials, can solve the problems of silicon/carbon nanocomposite material capacity decline, limited silicon application, and shortened battery cycle life.

Active Publication Date: 2016-12-07
NORTHEAST NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still two disadvantages in the following aspects: (1) Due to the rapid volume expansion and contraction of silicon materials during charge and discharge, the capacity of silicon/carbon nanocomposites decays rapidly; (2) during the cycle, the silicon/carbon n

Method used

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  • Nanometer hybrid material integrating positive/negative cyclic effects and preparation method thereof
  • Nanometer hybrid material integrating positive/negative cyclic effects and preparation method thereof
  • Nanometer hybrid material integrating positive/negative cyclic effects and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Preparation of (Si@MnO)@C / RGO Nano-hybrid Materials

[0027] Under the condition of magnetic stirring, the manganese chloride of 0.49 g, the sodium oleate of 1.52 g are successively added in the mixed solution of 8 ml water, 14 ml ethanol and 50 ml n-hexane, after stirring at room temperature for 4 hours, the mixed solution is layered, The upper layer solution becomes a light brown manganese oleate / n-hexane solution, and the lower layer is an aqueous solution of sodium chloride. The manganese oleate / n-hexane solution in the upper layer can be separated by repeated washing with 50 ml of deionized water through a separatory funnel. Then 60 mg of silicon nanoparticles were added to the manganese oleate / n-hexane solution, and after stirring for 4 hours, 18 mg of graphene nanosheets were added, stirred for 4 hours again, and then stirred at 70 o C rotary evaporation to obtain the precursor. Finally, under the condition of high-purity nitrogen atmosphere, the precursor was ...

Embodiment 2

[0029] Preparation of (Si@MnO)@C / RGO Nano-hybrid Materials

[0030] Under the condition of magnetic stirring, the manganese chloride of 0.49 g, the sodium oleate of 1.52 g are successively added in the mixed solution of 8 ml water, 14 ml ethanol and 50 ml n-hexane, after stirring at room temperature for 4 hours, the mixed solution is layered, The upper layer solution becomes a light brown manganese oleate / n-hexane solution, and the lower layer is an aqueous solution of sodium chloride. The manganese oleate / n-hexane solution in the upper layer can be separated by repeated washing with 50 ml of deionized water through a separatory funnel. Then 40 mg of silicon nanoparticles were added to manganese oleate / n-hexane solution, and after stirring for 4 hours, 18 mg of graphene nanosheets were added, stirred for 4 hours again, and then stirred at 70 o C rotary evaporation to obtain the precursor. Finally, under the condition of high-purity nitrogen atmosphere, the precursor was prep...

Embodiment 3

[0032] Preparation of (Si@MnO)@C / RGO Nano-hybrid Materials

[0033] Under the condition of magnetic stirring, the manganese chloride of 0.49 g, the sodium oleate of 1.52 g are successively added in the mixed solution of 8 ml water, 14 ml ethanol and 50 ml n-hexane, after stirring at room temperature for 4 hours, the mixed solution is layered, The upper layer solution becomes a light brown manganese oleate / n-hexane solution, and the lower layer is an aqueous solution of sodium chloride. The manganese oleate / n-hexane solution in the upper layer can be separated by repeated washing with 50 ml of deionized water through a separatory funnel. Then 20 mg of silicon nanoparticles were added to the manganese oleate / n-hexane solution, and after stirring for 4 hours, 20 mg of graphene nanosheets were added, stirred for 4 hours again, and then stirred at 70 o C rotary evaporation to obtain the precursor. Finally, under the condition of high-purity nitrogen atmosphere, the precursor was ...

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Abstract

The invention discloses a (Si@MnO)@C/RGO nanometer hybrid material integrating positive/negative cyclic effects and a preparation method and application thereof. The preparation method comprises the following steps of preparing normal hexane solution through chemical replacement reaction, adding Si and RGO to obtain precursor solution, and carrying out thermal treatment on a precursor in the inert atmosphere to obtain the (Si@MnO)@C/RGO nanometer hybrid material provided by the invention. The preparation method has the advantages of simplicity, mass production, easiness in obtaining raw materials and lower cost, the aggregation of (Si@MnO)@C particles in a preparation process is avoided, and meanwhile, the (Si@MnO)@C particles can be uniformly inserted between two-dimensional graphene nanosheet layers, so that the aggregation of the (Si@MnO)@C particles in a cyclic process can be stopped. When the (Si@MnO)@C/RGO nanometer hybrid material is applied to a cathode material of a lithium ion battery, the (Si@MnO)@C/RGO nanometer hybrid material shows the excellent rate capability and the high rate cycle performance.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a nano-hybrid material integrating positive / negative cycle effects, a preparation method thereof, and an application in the field of long-cycle lithium-ion battery materials. Background technique [0002] Lithium-ion batteries have become a new generation of high-energy green energy storage materials due to their advantages such as high capacity density, high power density, long cycle life and no pollution to the environment. At present, lithium-ion batteries have been widely used in energy storage devices such as various portable electronic products, wearable electronic products and electric vehicles. In order to meet the current urgent demand for electrode materials with high energy density, high power density and stable long cycle life, it is imminent to study electrode materials with high theoretical specific capacity and low voltage platform (negative electrode...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/38H01M4/583H01M4/62H01M4/36H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/505H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 吴兴隆刘代伙吕红艳张景萍
Owner NORTHEAST NORMAL UNIVERSITY
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