CN101927979A - Stannic oxide/ graphene nano composite as well as preparation method and application thereof - Google Patents

Abstract

The invention belongs to the technical field of new energy materials, in particular to a stannic oxide/ graphene nano composite as well as a preparation method and application thereof. The invention realizes low-temperature controllable preparation of the stannic oxide/ graphene nano composite by a one-step solvent thermal process. The width of rodlike stannic oxide particles is 8-10 nm, the length thereof is 30-50 nm, and the rodlike stannic oxide particles are evenly distributed on the surface of a graphene film. The method has simple synthetic technology and good repeatability. The nano composite can keep the high specific capacity of the stannic oxide, and the addition of the graphene greatly improves the cycle performance of the composite. The composite can serve as the anode material of a lithium ion battery.

Description

Tin oxide/graphene nanometer composite and its production and application

Technical field

The invention belongs to the new energy materials technical field, be specifically related to a kind of tin oxide/graphene nano composite and its production and application.

Background technology

Along with the World Economics develop rapidly of building on the fossil energy basis, the mankind face more and more severeer energy crisis.According to the comprehensive estimate of petroleum reserves, can be approximately 1180 ~ 1,510 hundred million tons for the limit of the fossil energy of arranging, with 33.2 hundred million tons of calculating of year yield of nineteen ninety-five world oil, petroleum reserves year declaration soon about 2050 is exhausted.Under the situation that is becoming tight world energy sources day, lithium ion battery has great strategic importance at new energy field, is the focal spot techniques of current generation.Data show in " 2011 Chinese lithium ion battery market trend observational study prediction address ": 1-3 month lithium ion battery market demand was 28.7 hundred million in 2010, predicted that lithium ion battery demand in 2013 will reach 39.9 hundred million.

The commercialization lithium ion battery all adopts the negative material of graphite as battery at present, and its theoretical charge/discharge capacity only is 372 mAh/g.Tin oxide is a kind of lithium ion battery negative material of high-quality, and its theoretical charge/discharge capacity can reach 782 mAh/g, can well satisfy the demand to the high-energy-density development of lithium ion battery instantly.

Summary of the invention

The object of the present invention is to provide that a kind of technology is simple, the tin oxide/graphene nano composite of function admirable and its production and application.

Nano composite material provided by the invention is composited by bar-shaped tin oxide nano particle and Graphene, and wherein, the wide of bar-shaped tin oxide nano particle is 8--12 nm, and is long for 30--50nm, is distributed in the graphene film surface uniformly; The mass ratio of tin oxide nano particle and Graphene is 3--4:1, preferred 3.44:1.

The present invention adopts easily, and a step solvent thermal process prepares the nano composite material that component is bar-shaped tin oxide nano particle and Graphene.It is easy that this nano composite material has preparation, and the material charge/discharge capacity is big, the advantage of good rate capability.In lithium ion battery, has good application prospects.

The preparation method of nano composite material of the present invention, concrete steps are as follows:

(1) at 25 ℃--80mg--100 mg graphite oxide is scattered in the 80ml--100 ml methyl-sulfoxide (DMSO) under 28 ℃, ultrasonic 2-2.5 hours, forms steady suspension.0.28 g-0.3 g Tin tetrachloride pentahydrate or 0.18 g-0.2 g, two hydration stannous chloride are joined in the above-mentioned suspension, at 25 ℃--28 ℃ were stirred 1-1.3 hours.

(2) step (1) gained solution is transferred to stainless steel hydro-thermal still, in 180 ℃--190 ℃ following heat treatment 12-24 hour.

(3) be cooled to room temperature after, suction filtration, deionized water washed product, drying at room temperature.

The present invention compared with prior art has following advantage:

(1) preparation method of gained composite is easy.

(2) the gained composite as the charge/discharge capacity of lithium ion battery negative greater than traditional graphite cathode material.

(3) the gained composite has the charge/discharge capacity height as lithium ion battery negative, the advantage of good cycle.

Description of drawings

Fig. 1 is the X ray diffracting spectrum of the nano composite material of bar-shaped tin oxide nano particle and Graphene.

Fig. 2 is the transmission electron microscope photo of the nano composite material of bar-shaped tin oxide nano particle and Graphene.

Fig. 3 is the chemical property figure of the nano composite material of bar-shaped tin oxide nano particle and Graphene as lithium ion battery negative.

The specific embodiment

Embodiment 1

Under 25 ℃, 80 mg graphite oxides are scattered in the 80ml methyl-sulfoxide (DMSO), ultrasonic 2 hours, form steady suspension.0.28 g Tin tetrachloride pentahydrate is joined in the above-mentioned suspension, stirred 1 hour at 25 ℃.Gained solution is transferred to 100 milliliters of stainless steel hydro-thermal stills, in 180 ℃ of following heat treatments 24 hours.After treating that stainless steel hydro-thermal still is cooled to room temperature, suction filtration, deionized water washed product, drying at room temperature.

Embodiment 2

Under 25 ℃, 80 mg graphite oxides are scattered in the 80ml methyl-sulfoxide (DMSO), ultrasonic 2 hours, form steady suspension.0.18 g, two hydration stannous chloride are joined in the above-mentioned suspension, stirred 1 hour at 25 ℃.Gained solution is transferred to 100 milliliters of stainless steel hydro-thermal stills, in 180 ℃ of following heat treatments 24 hours.After treating that stainless steel hydro-thermal still is cooled to room temperature, suction filtration, deionized water washed product, drying at room temperature.

Embodiment 3

Under 25 ℃, 80 mg graphite oxides are scattered in the 80ml methyl-sulfoxide (DMSO), ultrasonic 2 hours, form steady suspension.0.28 g Tin tetrachloride pentahydrate is joined in the above-mentioned suspension, stirred 1 hour at 25 ℃.Gained solution is transferred to 100 milliliters of stainless steel hydro-thermal stills, in 180 ℃ of following heat treatments 12 hours.After treating that stainless steel hydro-thermal still is cooled to room temperature, suction filtration, deionized water washed product, drying at room temperature.

Claims (3)

1. tin oxide/graphene nanometer composite, its characteristics are: component is bar-shaped tin oxide nano particle and Graphene, the wide of bar-shaped tin oxide nano particle is 8--12nm, longly is 30--50nm, is distributed in the graphene film surface uniformly; The mass ratio of bar-shaped tin oxide nano particle and Graphene is: 3--4:1.

2. the preparation method of a tin oxide/graphene nanometer composite as claimed in claim 1, its feature is as follows in concrete steps:

(1) at 25 ℃--80mg--100 mg graphite oxide is scattered in the 80ml--100ml methyl-sulfoxide under 28 ℃, ultrasonic 2-2.5 hours, forms steady suspension;--0.2g two hydration stannous chloride join in the above-mentioned suspension 25 ℃--28 ℃ stirred 1-1.3 hours with 0.28 g--0.3g Tin tetrachloride pentahydrate or 0.18 g;

(2) step (1) gained solution is transferred to stainless steel hydro-thermal still, in 180 ℃--190 ℃ following heat treatment 12-24 hour;

(3) be cooled to room temperature after, suction filtration, deionized water washed product, drying at room temperature.

3. tin oxide/graphene nanometer composite as claimed in claim 1 is as the application of high capacity lithium ion battery negative material.

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