CN107565102A

CN107565102A - A kind of method of coated Si nanosphere

Info

Publication number: CN107565102A
Application number: CN201710563952.8A
Authority: CN
Inventors: 洪涛
Original assignee: Chengdu Batsry Technology Co Ltd
Current assignee: Chengdu Batsry Technology Co Ltd
Priority date: 2017-07-12
Filing date: 2017-07-12
Publication date: 2018-01-09

Abstract

The method of one coated Si nanosphere, can solve tradition and directly be mixed using carbon with silicon materials, carbon material can not coat the technical problem of silicon materials highly desirablely.Including step 1：Prepare carbon source solution；Step 2：Hydro-thermal process carbon source solution；Step 3：High-temperature heating method.Due to using the predecessor of carbon in the present invention; i.e. thick or liquid organic matter mixes with silicon nanoparticle; and further carbonization obtains the core/shell structure of silicon/carbon; mixed with respect to solid carbon with silicon nanoparticle; it can preferably coat, and effectively lift the electron conduction of electrode material and alleviate the Volume Changes in charge and discharge process.

Description

A kind of method of coated Si nanosphere

Technical field

The present invention relates to field of batteries, and in particular to a kind of method of coated Si nanosphere.

Background technology

Silicon materials are due to specific discharge capacity (4200mA h g^-1) it is common graphite specific discharge capacity (372mA h g^-1) More than 10 times and be considered as most wish as charge-discharge battery of future generation negative material.But silicon materials are in interspersed lithium process In huge Volume Changes can cause electrode fragmentation, poor electric contact and unstable solid liquid interface so that electrode is actual Capacity drastically reduces.Meanwhile silicon, as electrode material, electron conduction is nor highly desirable.

To solve the problems, such as silicon as electrode material electron conduction is bad and volumetric expansion, generally by silicon nanoparticle with Carbon material mixes, as shown in figure 1, Fig. 1 is traditional nano silicon particles is simply mixed schematic diagram with carbon, this structure is due to introducing The excellent carbon material of electron conduction, while carbon material can alleviate the Volume Changes in silicon materials charge and discharge process to a certain degree, So as to effectively improve the high rate performance of electrode and cycle performance.It can directly be mixed due to conventional method using carbon with silicon materials, Carbon material can not coat silicon materials highly desirablely, although having certain effect, but effect is unsatisfactory.

The content of the invention

A kind of method of coated Si nanosphere proposed by the present invention, can solve tradition and directly be mixed using carbon with silicon materials, Carbon material can not coat the technical problem of silicon materials highly desirablely.

To achieve the above object, present invention employs following technical scheme：

A kind of method of coated Si nanosphere, including step 1：Prepare carbon source solution；

A certain amount of carbon source powder is weighed, while appropriate amount of deionized water is measured with graduated cylinder, the carbon source powder is dissolved in preparation In good deionized water, then stirring forms the carbon source solution of clarification, be subsequently placed into proper amount of nano silica flour continue stirring formed it is muddy Turbid solution；

Step 2：Hydro-thermal process carbon source solution；

Above-mentioned turbid solution is poured into stainless steel hydrothermal reaction kettle and sealed, reactor is then put into air dry oven In, hydro-thermal reaction 6h under the conditions of 180 DEG C, hydrothermal reaction kettle is opened after naturally cooling to room temperature, by reacted product cleaning mistake 12h is dried after filter under the conditions of 100 DEG C, the powder sample of brown is obtained after milling；

Step 3：High-temperature heating method；

The powder sample of gained brown in appropriate step 2 is weighed, powder sample is put into test tube, is continually fed into simultaneously Nitrogen empties invisible spectro oxygen, powder sample is handled by high-temperature heating, until silicon-carbon pomegranate structure is formed.

Further, the carbon source is glucose, sucrose, phenolic resin or furfural resin.

Further, the carbon source solution in the step 1 with magnetic stirrer into clarification.

Further, the step 3 high temperature is heated to be 900 DEG C of high-temperature heatings.

As shown from the above technical solution, the present invention is mixed using the predecessor of carbon with silicon nanosphere, followed by high temperature plus Hot method is handled mixture, until obtain moissanite pomegranate structure, is occurred in charge and discharge process so as to alleviating silicon materials Problem so that actual specific capacity is higher more stable, while lifts the electron conduction of electrode and alleviate its volumetric expansion.Not only such as This, preparation method of the invention simply, economical and environmentally friendly, will to mass produce this silicon-carbon pomegranate structure.

The method of the coated Si nanosphere of the present invention has the advantages that：

Due to using the predecessor of carbon in the present invention, i.e., thick or liquid organic matter mixes with silicon nanoparticle, And further carbonization obtains the core/shell structure of silicon/carbon, mixes, can preferably coat, and have with silicon nanoparticle with respect to solid carbon Volume Changes in the electron conduction and alleviation charge and discharge process of effect lifting electrode material.

Brief description of the drawings

Fig. 1 is that schematic diagram is simply mixed in the nano silicon particles of the present invention and carbon；

Fig. 2 is silicon-carbon pomegranate structure preparation process schematic diagram of the present invention；

Fig. 3 is single carbon coating nano silicon particles transmission electron microscope figure of the invention；

Fig. 4 is silicon-carbon pomegranate structural representation of the present invention.

Embodiment

The present invention will be further described below in conjunction with the accompanying drawings：

As shown in Fig. 2 the method for the coated Si nanosphere described in the present embodiment, including：

Step 1：Prepare glucose solution；

Electronic scale weighs 27g glucose powder, while measures 100mL deionized waters with graduated cylinder, by 27g glucose powder It is dissolved in 100mL deionized waters, the glucose solution of clarification is formed with magnetic stirrer 10min, 2g is subsequently placed into and receives Rice silica flour continues to stir the solution that 10min forms muddiness.

Step 2：Hydro-thermal process glucose；

Pour this solution into the stainless steel hydrothermal reaction kettle of 250mL teflon lineds and seal, then by reactor It is put into air dry oven, hydro-thermal reaction 6h under the conditions of 180 DEG C, opens hydrothermal reaction kettle after naturally cooling to room temperature, will react 12h is dried under the conditions of 100 DEG C after product cleaning filtering afterwards, the powder sample of brown is obtained after milling.

Step 3：High-temperature heating method；

Electronic scale weighs the powder sample of 10g browns, and powder sample is put into test tube, while is continually fed into nitrogen and incites somebody to action Invisible spectro oxygen emptying, is handled powder sample using 900 degree of high-temperature heating methods.

As above, until silicon-carbon pomegranate structure is formed, as shown in Figure 3 and Figure 4, stone is presented in the Si-C composite material after carbon coating Pomegranate structure, i.e. nano silicon particles are effectively coated on inside carbon three-dimensional structure.And traditional Si-C composite material simply simply mixes Close, it is difficult to realize effectively cladding.

Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention Enclose and be defined, on the premise of design spirit of the present invention is not departed from, technical side of the those of ordinary skill in the art to the present invention The various modifications and improvement that case is made, all should fall within the scope of protection of the present invention.

Claims

A kind of 1. method of coated Si nanosphere, it is characterised in that：Comprise the following steps：

Step 1：Prepare carbon source solution；

A certain amount of carbon source powder is weighed, while appropriate amount of deionized water is measured with graduated cylinder, the carbon source powder is dissolved in ready In deionized water, the carbon source solution for forming clarification is then stirred, proper amount of nano silica flour is subsequently placed into and continues stirring formation muddiness Solution；

Step 2：Hydro-thermal process carbon source solution；

Above-mentioned turbid solution is poured into stainless steel hydrothermal reaction kettle and sealed, then reactor is put into air dry oven, 180 Hydro-thermal reaction 6h under the conditions of DEG C, hydrothermal reaction kettle is opened after naturally cooling to room temperature, by reacted product cleaning filter after 12h is dried under the conditions of 100 DEG C, the powder sample of brown is obtained after milling；

Step 3：High-temperature heating method；

The powder sample of gained brown in appropriate step 2 is weighed, powder sample is put into test tube, while be continually fed into nitrogen Invisible spectro oxygen is emptied, powder sample handled by high-temperature heating, until silicon-carbon pomegranate structure is formed.
2. the method for coated Si nanosphere according to claim 1, it is characterised in that：The carbon source be glucose, sucrose, Phenolic resin or furfural resin.
3. the method for coated Si nanosphere according to claim 3, it is characterised in that：Magnetic agitation is used in the step 1 Device stirs into the carbon source solution of clarification.
4. the method for the coated Si nanosphere according to claims 1 to 3 any one, it is characterised in that：The step 3 High temperature is heated to be 900 DEG C of high-temperature heatings.