CN109244440A - A kind of NiO-ZnO composite material and preparation method and lithium ion battery - Google Patents
A kind of NiO-ZnO composite material and preparation method and lithium ion battery Download PDFInfo
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
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- H—ELECTRICITY
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
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Abstract
The present invention discloses a kind of NiO-ZnO composite material and preparation method and lithium ion battery.Bi-component NiO-ZnO composite material is prepared using simple hydro-thermal method combination calcination processing in the present invention.It is compared with one pack system NiO and ZnO, bi-component NiO-ZnO composite material has excellent chemical property, the main reason is that foring internal electric field at the heterojunction boundary that NiO and ZnO is formed, enhances the electron transmission between nano particle；Stress caused by being changed simultaneously using the synergistic effect of bi-component come buffer volumes and the integrality for keeping structure, and then improve the cycle performance of material；And a large amount of simple substance Ni and simple substance Zn is produced in discharge process for the first time with electrocatalytic effect, the progress of reaction can be promoted, to improve the chemical property of material.
Description
Technical field
The present invention relates to technical field of composite materials more particularly to a kind of NiO-ZnO composite material and preparation method with
Lithium ion battery.
Background technique
Since 21 century, it is outstanding day by day rapidly to develop the caused energy and environmental issue by economy, people to cleaning and
The demand of sustainable energy gradually increases, and lithium ion battery is concerned as a kind of new green energy.In lithium-ion electric
Chi Zhong, negative electrode material are its important component parts, and the main body as storage lithium plays decisive work to lithium ion electrochemical performance
With.Currently, commercialized lithium ion battery negative material is mainly graphite, lower theoretical capacity (372 mAhg-1) remote
Far from meeting the needs of people's high energy density cells.Transition metal oxide is because of its theoretical capacity (> 600 with higher
mAh·g-1) and good storage lithium ability and be considered as a kind of very promising negative electrode material.However, electronic conductivity is low,
Volume expansion and voltage delay etc. are transition metal oxides as the lithium ion battery negative material three major issues to be faced.
Low electronic conductivity limits the transmission of electronics, hinders the electron transport ability of electrode material, to influence transition metal
The conversion reaction of oxide and lithium, leads to that polarization is big, energy efficiency is low, poor circulation.Volume expansion destroys active material
Structure, cause the cyclical stability of material poor.There are voltage delay phenomenon between discharge potential and charging potential, lead to energy
Low efficiency.
In order to solve the problems of transition metal oxide, the chemical property of material is improved, usually to transition gold
Belong to oxide and takes the modification strategies such as nanosizing, structure optimization and Composite.Wang etc. is by electrochemical deposition method in copper foil
Upper deposition 0D Mn3O4Nanoparticle, in 936 mAg-1Current density under first charge-discharge specific capacity be 622 and 919
mAh·g-1, reversible specific capacity maintains 882 mAhg after circulation 85 is enclosed-1；Liu et al. is based on sol-gel method, with receiving
The NiO gel layer of meter level covers filter paper, is prepared into hollow NiO nano-tube material by calcining in Muffle furnace.Higher ratio
Surface and stable hollow structure determine the height ratio capacity and good cyclical stability of its electrode material, are in current density
1000 mA·g-1Lower 100 circle of circulation, reversible specific capacity still have 570 mAhg-1；Xiang etc. passes through in basic plating nickel solution
It is middle that the surface that Ni nano particle is coated on flower-shaped CuO is formed by CuO/Ni composite material, the presence of nickel simple substance using electrodeposition process
The coulombic efficiency for the first time of flower-shaped CuO is promoted to 72.1% from 57%, and capacity retention ratio still has 94.3% after 50 circulations.
Although being applied to high capacity, good as it can be seen that the research of transition metal oxide negative electrode material has certain development
There is still a need for further further investigations for the lithium ion battery of good cycle performance.
Summary of the invention
In view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of NiO-ZnO composite material and its systems
Preparation Method and lithium ion battery, it is intended to which it is low to solve existing negative electrode material electronic conductivity, the defects of volume expansion and voltage delay
The problem of caused lithium ion battery chemical property difference.
Technical scheme is as follows:
A kind of preparation method of NiO-ZnO composite material, wherein comprising steps of
(1) nickel salt and zinc salt is taken to dissolve in deionized water first, stirring forms uniform mixed liquor；
(2) urea is added in above-mentioned uniform mixed liquor again and is stirred, be then transferred into ptfe autoclave, then put
Enter 160-200 DEG C of reaction 8-16h of homogeneous reactor high temperature；
(3) to the end of reacting, after being cooled to room temperature, before successively being filtered separation, washing and be dried to obtain NiO-ZnO composite material
Drive body；
(4) the NiO-ZnO composite material precursor after drying is finally passed through into 400-700 DEG C of calcining 2-6h of Muffle furnace high temperature, system
Obtain NiO-ZnO composite material.
The preparation method of the NiO-ZnO composite material, wherein in step (1), the molar ratio of the nickel salt and zinc salt
For (1-3): (1-3).
The preparation method of the NiO-ZnO composite material, wherein in step (1), the nickel salt is nickel nitrate or acetic acid
Nickel.
The preparation method of the NiO-ZnO composite material, wherein in step (1), the zinc salt is zinc nitrate or acetic acid
Zinc.
The preparation method of the NiO-ZnO composite material, wherein in step (3), the process of the washing includes: point
Not Yong deionized water and washes of absolute alcohol three times.
The preparation method of the NiO-ZnO composite material, wherein in step (3), the process of the drying include:
Dry 8h in 70 DEG C of air dry ovens.
A kind of NiO-ZnO composite material, wherein using the preparation method system of NiO-ZnO composite material of the present invention
It is standby to obtain.
The NiO-ZnO composite material, wherein the NiO-ZnO composite material is nano particle, the nano particle
Partial size be 80-120nm.
A kind of lithium ion battery, including cathode, wherein the negative electrode material includes NiO-ZnO of the present invention compound
Material.
The utility model has the advantages that comparing with one pack system NiO and ZnO, bi-component NiO-ZnO composite material has excellent electrochemistry
Can, the main reason is that foring internal electric field at the heterojunction boundary that NiO and ZnO is formed, enhance the electricity between nano particle
Son transmitting；Stress caused by being changed simultaneously using the synergistic effect of bi-component come buffer volumes and the integrality for keeping structure, into
And improve the cycle performance of material；And a large amount of simple substance Ni and simple substance Zn is produced in discharge process for the first time with electrochemistry
Catalytic action can promote the progress of reaction, to improve the chemical property of material.
Detailed description of the invention
Fig. 1 is the preparation flow figure of NiO-ZnO composite material in the specific embodiment of the invention 4.
Fig. 2 is that NiO-ZnO composite material made from the specific embodiment of the invention 4, the Flied emission scanning electron of NiO, ZnO are aobvious
Micro mirror SEM figure.
Fig. 3 is the XRD diagram of NiO-ZnO composite material, NiO, ZnO made from the specific embodiment of the invention 4.
Fig. 4 is the cycle performance figure of NiO-ZnO composite material, NiO, ZnO made from the specific embodiment of the invention 4.
Fig. 5 is the high rate performance figure of NiO-ZnO composite material made from the specific embodiment of the invention 4, NiO, ZnO.
Specific embodiment
The present invention provides a kind of NiO-ZnO composite material and preparation method and lithium ion battery, to make mesh of the invention
, technical solution and effect it is clearer, clear, the present invention is described in more detail below.It should be appreciated that described herein
Specific embodiment be only used to explain the present invention, be not intended to limit the present invention.
The embodiment of the present invention provides a kind of preparation method of NiO-ZnO composite material, wherein comprising steps of
(1) take nickel salt and zinc salt to dissolve in deionized water first, stirring forms uniform mixed liquor (in light green)；
(2) urea is added in above-mentioned uniform mixed liquor again and is stirred, be then transferred into ptfe autoclave, then put
Enter 160-200 DEG C of reaction 8-16h of homogeneous reactor high temperature；
(3) to the end of reacting, after being cooled to room temperature, before successively being filtered separation, washing and be dried to obtain NiO-ZnO composite material
Drive body；
(4) the NiO-ZnO composite material precursor after drying is finally passed through into 400-700 DEG C of calcining 2-6h of Muffle furnace high temperature, system
Obtain NiO-ZnO composite material.
Bi-component NiO-ZnO composite wood is prepared using simple hydro-thermal method combination calcination processing in the embodiment of the present invention
Material.It is compared with one pack system NiO and ZnO, bi-component NiO-ZnO composite material has excellent chemical property, main cause
It is to form internal electric field at heterojunction boundary that NiO and ZnO are formed, enhances the electron transmission between nano particle；Benefit simultaneously
Stress caused by being changed with the synergistic effect of bi-component come buffer volumes and the integrality for keeping structure, and then improve following for material
Ring performance；And a large amount of simple substance Ni and simple substance Zn is produced in discharge process for the first time with electrocatalytic effect, it can
The progress for promoting reaction, to improve the chemical property of material.
NiO-ZnO composite material has under different potentials different using these ingredients in polyoxide composite material
Electro-chemical activity.When a kind of transition metal oxide is embedded in Li+When, other oxides can be used as buffering matrix, and vice versa.
Importantly, every kind of oxide is all the active material that can store lithium compared with transition metal oxide and carbon composite,
So as to provide higher specific capacity.
In step (1), it is preferred that the molar ratio of the nickel salt and zinc salt is (1-3): (1-3), different nickel salts and zinc salt
Molar ratio influences chemical property that is very big, and then influencing battery to the pattern of product.In above-mentioned molar ratio range, acquisition
Battery has preferable chemical property.
In step (1), it is preferred that the nickel salt is nickel nitrate or nickel acetate.
In step (1), it is preferred that the zinc salt is zinc nitrate or zinc acetate.
In step (3), it is preferred that the process of the washing includes: to use deionized water and washes of absolute alcohol three times respectively.
In step (3), it is preferred that the process of the drying includes: the dry 8h in 70 DEG C of air dry ovens.
In step (4), the NiO-ZnO composite material precursor after drying is further comprised the steps of: before high-temperature calcination to institute
NiO-ZnO composite material after stating drying is ground.NiO-ZnO composite material after the drying is abundant in mortar
Grinding, can guarantee that subsequent calcination is abundant.
The embodiment of the present invention provides a kind of NiO-ZnO composite material, wherein using NiO- described in the embodiment of the present invention
The preparation method of ZnO composite material is prepared.Wherein the NiO-ZnO composite material is nano particle, the grain of nano particle
Diameter is about 100nm.
The embodiment of the present invention provides a kind of lithium ion battery, including cathode, wherein the negative electrode material includes that the present invention is real
Apply NiO-ZnO composite material described in example.
Embodiment 1:
(1) 2 mmol Ni (CH are weighed first3COO)2•4H2O, 1 mmol Zn (CH3COO)2•4H2O be dissolved in 120 mL go from
In sub- water, magnetic agitation 10min forms uniform mixed liquor；
(2) 6 mmol urea are dissolved in above-mentioned uniform mixed liquor again, 30 min of magnetic agitation；Then mixed liquor is transferred to
12 h are reacted in the ptfe autoclave of 150 mL under 160 DEG C of high temperature；
(3) to the end of reacting, after being cooled to room temperature, product carries out suction filtration separation with Buchner funnel, and respectively with deionized water and
Dehydrated alcohol washing is placed on 8 h of freeze-day with constant temperature in 70 DEG C of air dry oven three times；
(4) presoma after drying is finally calcined into 4 h at 400 DEG C at placing in Muffle furnace after powder with mortar grinder.
(5) as a comparison, Zn (CH is not added when NiO is prepared separately3COO)2•4H2O；Similarly, do not add when ZnO is prepared separately
Add Ni (CH3COO)2•4H2O；Other conditions are constant.
SEM figure, XRD diagram, cycle performance figure and the high rate performance figure of NiO-ZnO composite material manufactured in the present embodiment exist
This does not show one by one.It is found through analysis, similar to Example 4, the obtained NiO-ZnO composite material of the present embodiment has similar
Feature performance benefit.
Embodiment 2:
(1) 2 mmol Ni (CH are weighed first3COO)2•4H2O, 1 mmol Zn (CH3COO)2•4H2O be dissolved in 120 mL go from
In sub- water, magnetic agitation 10min forms uniform mixed liquor；
(2) 6 mmol urea are dissolved in above-mentioned uniform mixed liquor again, 30 min of magnetic agitation；Then mixed liquor is transferred to
12 h are reacted in the ptfe autoclave of 150 mL under 180 DEG C of high temperature；
(3) to the end of reacting, after being cooled to room temperature, product carries out suction filtration separation with Buchner funnel, and respectively with deionized water and
Dehydrated alcohol washing is placed on 8 h of freeze-day with constant temperature in 70 DEG C of air dry oven three times；
(4) presoma after drying is finally calcined into 4 h at 400 DEG C at placing in Muffle furnace after powder with mortar grinder.
(5) as a comparison, Zn (CH is not added when NiO is prepared separately3COO)2•4H2O；Similarly, do not add when ZnO is prepared separately
Add Ni (CH3COO)2•4H2O；Other conditions are constant.
SEM figure, XRD diagram, cycle performance figure and the high rate performance figure of NiO-ZnO composite material manufactured in the present embodiment exist
This does not show one by one.It is found through analysis, similar to Example 4, the obtained NiO-ZnO composite material of the present embodiment has similar
Feature performance benefit.
Embodiment 3:
(1) 2 mmol Ni (CH are weighed first3COO)2•4H2O, 1 mmol Zn (CH3COO)2•4H2O be dissolved in 120 mL go from
In sub- water, magnetic agitation 10min forms uniform mixed liquor；
(2) 6 mmol urea are dissolved in above-mentioned uniform mixed liquor again, 30 min of magnetic agitation；Then mixed liquor is transferred to
12 h are reacted in the ptfe autoclave of 150 mL under 200 DEG C of high temperature；
(3) to the end of reacting, after being cooled to room temperature, product carries out suction filtration separation with Buchner funnel, and respectively with deionized water and
Dehydrated alcohol washing is placed on 8 h of freeze-day with constant temperature in 70 DEG C of air dry oven three times；
(4) presoma after drying is finally calcined into 4 h at 400 DEG C at placing in Muffle furnace after powder with mortar grinder.
(5) as a comparison, Zn (CH is not added when NiO is prepared separately3COO)2•4H2O；Similarly, do not add when ZnO is prepared separately
Add Ni (CH3COO)2•4H2O；Other conditions are constant.
SEM figure, XRD diagram, cycle performance figure and the high rate performance figure of NiO-ZnO composite material manufactured in the present embodiment exist
This does not show one by one.It is found through analysis, similar to Example 4, the obtained NiO-ZnO composite material of the present embodiment has similar
Feature performance benefit.
Embodiment 4:
Fig. 1 is the preparation flow figure of NiO-ZnO composite material in the present embodiment, the preparation process of the NiO-ZnO composite material
It is specific as follows:
(1) 2 mmol Ni (CH are weighed first3COO)2•4H2O, 1 mmol Zn (CH3COO)2•4H2O be dissolved in 120 mL go from
In sub- water, magnetic agitation 10min forms uniform mixed liquor；
(2) 6 mmol urea are dissolved in above-mentioned uniform mixed liquor again, 30 min of magnetic agitation；Then mixed liquor is transferred to
12 h are reacted in the ptfe autoclave of 150 mL under 180 DEG C of high temperature；
(3) to the end of reacting, after being cooled to room temperature, product carries out suction filtration separation with Buchner funnel, and respectively with deionized water and
Dehydrated alcohol washing is placed on 8 h of freeze-day with constant temperature in 70 DEG C of air dry oven three times；
(4) presoma after drying is finally calcined into 4 h at 500 DEG C at placing in Muffle furnace after powder with mortar grinder.
(5) as a comparison, Zn (CH is not added when NiO is prepared separately3COO)2•4H2O；Similarly, do not add when ZnO is prepared separately
Add Ni (CH3COO)2•4H2O；Other conditions are constant.
Corresponding characterization test is carried out to NiO-ZnO composite material obtained.
Fig. 2 is that the field emission scanning electron microscope SEM of NiO-ZnO composite material, NiO and ZnO schemes.Fig. 2 a and Fig. 2 d is
Shape appearance figure of the NiO-ZnO composite material under different amplification, therefrom it can clearly be seen that the pattern of NiO-ZnO composite material
For nano particle, size is about 100nm；Fig. 2 b and Fig. 2 e are shape appearance figure of the NiO under different amplification, Fig. 2 c and Fig. 2 f
For shape appearance figure of the ZnO under different amplification, it can be observed that the pattern of NiO and ZnO is porous nano-sheet, under big multiple
NiO(Fig. 2 e can be clearly observed) and ZnO(Fig. 2 f) it is porous nano-sheet made of being stacked as nano particle.
Fig. 3 is the XRD spectra of NiO-ZnO composite material, NiO and ZnO.It can obviously observe that NiO-ZnO is compound in figure
Diffraction maximum of the material at 37.25 °, 43.28 °, 62.87 °, 75.41 ° and 79.40 ° respectively corresponds cube type crystal structure
(111), (200), (220), (311) and (222) crystal face of NiO standard card PDF#65-5745；At 31.77 ° 34.42 °
Diffraction maximum at 36.25 ° and 62.86 ° corresponds to the ZnO standard card PDF#36-1451's of wurtzite-type crystal structure
(100), (002), (101) and (103) crystal face, faint diffraction maximum corresponds at 47.53 °, 56.60 ° and 69.09 °
(102), (110) and (201) crystal face；The diffraction maximum of NiO and ZnO respectively can be with standard card PDF#65-5745 and PDF#36-
1451 match, and illustrate that NiO-ZnO composite material is made of Cubic NiO and wurtzite-type ZnO.
Fig. 4 is the cycle performance figure of NiO-ZnO composite material, NiO and ZnO.NiO-ZnO composite material is in 200mAg-1
Current density under circulation 200 circle after reversible specific capacity be 978.3mAhg-1, hence it is evident that better than the 550.8mAh of one pack system NiO
g-1With the 211.4mAhg of one pack system ZnO-1.This is because the synergistic effect that the NiO-ZnO composite material of bi-component generates has
Effect alleviates deintercalation Li+Volume expansion in the process improves the conductivity of material.
Fig. 5 is the high rate performance figure of NiO-ZnO composite material, NiO and ZnO.By can significantly observe NiO- in figure
For ZnO composite material compared with one-component NiO and ZnO, recycling 10 under different current densities and enclose has higher capacity, and
0.1Ag is returned after different current densities circulation-1When, reversible specific capacity has been more than the reversible specific volume of initial 10 circulations
Amount, has shown good high rate performance.The NiO-ZnO composite material of bi-component forms heterojunction structure, improves material
Electric conductivity.The synergistic effect between bi-component NiO-ZnO composite material effectively alleviates material in cyclic process at the same time
Volume expansion so that it has shown better high rate performance.
Embodiment 5:
(1) 2 mmol Ni (CH are weighed first3COO)2•4H2O, 1 mmol Zn (CH3COO)2•4H2O be dissolved in 120 mL go from
In sub- water, magnetic agitation 10min forms uniform mixed liquor；
(2) 6 mmol urea are dissolved in above-mentioned uniform mixed liquor again, 30 min of magnetic agitation；Then mixed liquor is transferred to
12 h are reacted in the ptfe autoclave of 150 mL under 180 DEG C of high temperature；
(3) to the end of reacting, after being cooled to room temperature, product carries out suction filtration separation with Buchner funnel, and respectively with deionized water and
Dehydrated alcohol washing is placed on 8 h of freeze-day with constant temperature in 70 DEG C of air dry oven three times；
(4) presoma after drying is finally calcined into 4 h at 600 DEG C at placing in Muffle furnace after powder with mortar grinder.
(5) as a comparison, Zn (CH is not added when NiO is prepared separately3COO)2•4H2O；Similarly, do not add when ZnO is prepared separately
Add Ni (CH3COO)2•4H2O；Other conditions are constant.
SEM figure, XRD diagram, cycle performance figure and the high rate performance figure of NiO-ZnO composite material manufactured in the present embodiment exist
This does not show one by one.It is found through analysis, similar to Example 4, the obtained NiO-ZnO composite material of the present embodiment has similar
Feature performance benefit.
Embodiment 6:
(1) 2 mmol Ni (CH are weighed first3COO)2•4H2O, 1 mmol Zn (CH3COO)2•4H2O be dissolved in 120 mL go from
In sub- water, magnetic agitation 10min forms uniform mixed liquor；
(2) 6 mmol urea are dissolved in above-mentioned uniform mixed liquor again, 30 min of magnetic agitation；Then mixed liquor is transferred to
12 h are reacted in the ptfe autoclave of 150 mL under 180 DEG C of high temperature；
(3) to the end of reacting, after being cooled to room temperature, product carries out suction filtration separation with Buchner funnel, and respectively with deionized water and
Dehydrated alcohol washing is placed on 8 h of freeze-day with constant temperature in 70 DEG C of air dry oven three times；
(4) presoma after drying is finally calcined into 4 h at 700 DEG C at placing in Muffle furnace after powder with mortar grinder.
(5) as a comparison, Zn (CH is not added when NiO is prepared separately3COO)2•4H2O；Similarly, do not add when ZnO is prepared separately
Add Ni (CH3COO)2•4H2O；Other conditions are constant.
SEM figure, XRD diagram, cycle performance figure and the high rate performance figure of NiO-ZnO composite material manufactured in the present embodiment exist
This does not show one by one.It is found through analysis, similar to Example 4, the obtained NiO-ZnO composite material of the present embodiment has similar
Feature performance benefit.
In conclusion the present invention provides a kind of NiO-ZnO composite material and preparation method and lithium ion battery, specifically adopt
Bi-component NiO-ZnO composite material is prepared with simple hydro-thermal method combination calcination processing.It is compared with one pack system NiO and ZnO,
Bi-component NiO-ZnO composite material has excellent chemical property, the main reason is that hetero-junctions circle that NiO and ZnO is formed
Internal electric field is formd at face, enhances the electron transmission between nano particle；It is buffered simultaneously using the synergistic effect of bi-component
Stress caused by volume change and the integrality for keeping structure, and then improve the cycle performance of material；And it discharged for the first time
A large amount of simple substance Ni and simple substance Zn is produced in journey with electrocatalytic effect, can promote the progress of reaction, to improve
The chemical property of material.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations all should belong to the guarantor of appended claims of the present invention
Protect range.
Claims (9)
1. a kind of preparation method of NiO-ZnO composite material, which is characterized in that comprising steps of
(1) nickel salt and zinc salt is taken to dissolve in deionized water first, stirring forms uniform mixed liquor；
(2) urea is added in above-mentioned uniform mixed liquor again and is stirred, be then transferred into ptfe autoclave, then put
Enter 160-200 DEG C of reaction 8-16h of homogeneous reactor high temperature；
(3) to the end of reacting, after being cooled to room temperature, before successively being filtered separation, washing and be dried to obtain NiO-ZnO composite material
Drive body；
(4) the NiO-ZnO composite material precursor after drying is finally passed through into 400-700 DEG C of calcining 2-6h of Muffle furnace high temperature, system
Obtain NiO-ZnO composite material.
2. the preparation method of NiO-ZnO composite material according to claim 1, which is characterized in that described in step (1)
The molar ratio of nickel salt and zinc salt is (1-3): (1-3).
3. the preparation method of NiO-ZnO composite material according to claim 1, which is characterized in that described in step (1)
Nickel salt is nickel nitrate or nickel acetate.
4. the preparation method of NiO-ZnO composite material according to claim 1, which is characterized in that described in step (1)
Zinc salt is zinc nitrate or zinc acetate.
5. the preparation method of NiO-ZnO composite material according to claim 1, which is characterized in that described in step (3)
The process of washing includes: to use deionized water and washes of absolute alcohol three times respectively.
6. the preparation method of NiO-ZnO composite material according to claim 1, which is characterized in that described in step (3)
Dry process includes: the dry 8h in 70 DEG C of air dry ovens.
7. a kind of NiO-ZnO composite material, which is characterized in that use NiO-ZnO composite wood described in any one of claims 1-6
The preparation method of material is prepared.
8. NiO-ZnO composite material according to claim 7, which is characterized in that the NiO-ZnO composite material is nanometer
Particle, the partial size of the nano particle are 80-120nm.
9. a kind of lithium ion battery, including cathode, which is characterized in that the negative electrode material includes any one of claim 7-8 institute
The NiO-ZnO composite material stated.
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