CN103474628B - The preparation method of the coated tertiary cathode material of carbon and the coated tertiary cathode material of this carbon - Google Patents
The preparation method of the coated tertiary cathode material of carbon and the coated tertiary cathode material of this carbon Download PDFInfo
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Abstract
The invention discloses preparation method and the coated tertiary cathode material of this carbon of the coated tertiary cathode material of a kind of carbon, preparation method comprises the following steps: S1, with nickel salt, cobalt salt and manganese salt for raw material, preparation ternary anode material precursor; S2, preparation conductive carbon dispersion: conductive carbon is scattered in the water containing organic carbon source; S3, ternary anode material precursor and lithium compound to be joined in conductive carbon dispersion, mix, obtain mixture; S4, mixture to be dried under vacuum; S5, by the mixture of drying high-temperature process in confined conditions or in the atmosphere of inert gas shielding, obtain the coated tertiary cathode material of carbon.The present invention coated even, simple to operate, cost is low and efficiency is high, wherein conductive carbon and tertiary cathode material are coated on simultaneously and have in network-like amorphous carbon, amorphous carbon serves as conductive media or the passage of conductive carbon and tertiary cathode material wherein, greatly increases the high rate performance of this tertiary cathode material.
Description
Technical field
The present invention relates to lithium ion battery material technical field, particularly relate to a kind of preparation method and the coated tertiary cathode material of this carbon of the coated tertiary cathode material of carbon of lithium ion battery.
Background technology
Lithium ion battery has a series of advantages such as specific energy is high, operating voltage is high, fail safe is good, memory-less effect, not only extensive use is taken notes the electrical source of power of the portable type electronic products such as this computer, digital camera, mobile phone, video camera, also will become one of main power source of electric bicycle, battery-operated motor cycle and electric automobile simultaneously.This is on the one hand for the development of lithium ion battery provides broad space, constantly widening and the continuous upgrading of corresponding product and the replacement on the other hand along with battery applications field, will propose more and more higher requirement to lithium ion battery, and the most direct way improving battery combination property improves battery material performance.
Positive electrode, as one of battery core parts, plays key effect to battery combination property, therefore carries out positive electrode study on the modification significant.Material modification mainly contains two approach: one is doping vario-property, another surface coating modification, and wherein Surface coating is a kind of modified method relatively more conventional in industrialization.
In electrokinetic cell field, positive electrode cycle characteristics and high rate performance research be two important research directions of material modification, as patent ZL200610147247.1: the nanometer LiCoO that a kind of carbon is coated
2material and its preparation method and application, discloses by LiCoO
2carbon is covered to improve materials conductive coefficient in surface, optimizes the rate charge-discharge performance of material.And the conductivity of current tertiary cathode material is poorer than the sour lithium of cobalt, still to be improved.And, existingly often corpuscular conductive carbon and corpuscular positive electrode mechanically to be mixed in cell fabrication processes, there is the defect that conductive carbon can not effectively contact with positive electrode in this mixing, thus causes electronics not move smoothly, the high rate performance of restriction material.
Existing in the modification of tertiary cathode material, also comprise the method adopting the coated tertiary cathode material of organic carbon, the coated needs of this kind of method adopts catalyst coated to just carrying out after organic carbon emulsification, and method of operation is complicated and requirement is higher.
Summary of the invention
The technical problem to be solved in the present invention is, provide a kind of simple to operate, cost is low and improve preparation method and the coated tertiary cathode material of this carbon of the high rate performance of material and the coated tertiary cathode material of carbon of cycle performance.
The technical solution adopted for the present invention to solve the technical problems is: the preparation method providing the coated tertiary cathode material of a kind of carbon, comprises the following steps:
S1, with nickel salt, cobalt salt and manganese salt for raw material, preparation ternary anode material precursor;
S2, preparation conductive carbon dispersion: conductive carbon is scattered in the water containing organic carbon source;
S3, described ternary anode material precursor and lithium compound to be joined in described conductive carbon dispersion, mix, obtain mixture;
S4, described mixture to be dried under vacuum;
S5, by the described mixture of drying in confined conditions or in the atmosphere of inert gas shielding, high-temperature process at 500-1100 DEG C; Described ternary anode material precursor forms tertiary cathode material, described conductive carbon is distributed in described tertiary cathode material surface, described organic carbon source is formed has network-like amorphous carbon, by described conductive carbon and tertiary cathode material coated, obtain the coated tertiary cathode material of carbon.
In the preparation method of the coated tertiary cathode material of carbon of the present invention, in step S1, the chemical formula of obtained described ternary anode material precursor is Ni
xco
ymn
1-x-y(OH)
2; In step S5, the chemical formula of the described tertiary cathode material of formation is LiNi
xco
ymn
1-x-yo
2; Wherein, 0<x<1,0<y<1, and x+y<1.
In the preparation method of the coated tertiary cathode material of carbon of the present invention, in step S1, described nickel salt is the sulfate of nickel, nitrate or hydrochloride, and described cobalt salt is the sulfate of cobalt, nitrate or hydrochloride, and described manganese salt is the sulfate of manganese, nitrate or hydrochloride.
In the preparation method of the coated tertiary cathode material of carbon of the present invention, in step S1, adopt half liquid half to consolidate method and described raw material is made ternary anode material precursor; Described half liquid half admittedly method first described nickel salt, cobalt salt and manganese salt is mixed with mixed solution, adopts liquid-phase precipitation method to obtain the pulp-like mixture of described nickel salt, cobalt salt and manganese salt, then adopt low heat temperature solid state reaction to obtain described ternary anode material precursor; The mixed solution concentration of described nickel salt, cobalt salt and manganese salt is 0.2-5mol/L.
In the preparation method of the coated tertiary cathode material of carbon of the present invention, in step S2, the mass volume ratio between described conductive carbon and the described water containing organic carbon source is 1:10-100;
Described containing in the water of organic carbon source, the weight percentage of organic carbon source is 10-80%.
In the preparation method of the coated tertiary cathode material of carbon of the present invention, in step S2, described conductive carbon is one or more in graphite, carbon nano-tube, Graphene, acetylene carbon black and superconduction carbon black, and described organic carbon source is one or more in sucrose, glucose, polyacrylic acid, starch, polyethylene glycol and resorcinol;
In step S3, described lithium compound is one or more in lithium carbonate, lithium hydroxide and lithium chloride.
In the preparation method of the coated tertiary cathode material of carbon of the present invention, in step S3, the mass ratio of the conductive carbon in described ternary anode material precursor and conductive carbon dispersion is 99.5:0.5-95:5.
In the preparation method of the coated tertiary cathode material of carbon of the present invention, in step S5, the gas flow of described inert gas is 0.05-0.2L/min; Described inert gas is one or more in nitrogen and argon gas.
The present invention also provides a kind of carbon coated tertiary cathode material, adopts the coated tertiary cathode material preparation method of above-mentioned carbon to obtain.
The present invention also provides a kind of carbon coated tertiary cathode material, comprise tertiary cathode material, conductive carbon and there is network-like amorphous carbon, described conductive carbon be distributed in described tertiary cathode material surface, described amorphous carbon by described conductive carbon and tertiary cathode material coated.
Implement the present invention and there is following beneficial effect:
1, the present invention by conductive carbon and organic carbon source with the use of preparing the coated tertiary cathode material of carbon, organic carbon source under anoxic conditions high-temperature process formation has network-like amorphous carbon, together with conductive carbon and tertiary cathode material is simultaneously coated, amorphous carbon serves as conductive media or the passage of conductive carbon and tertiary cathode material wherein, greatly increases the high rate performance of this tertiary cathode material.
2, amorphous carbon has good electric conductivity, its coated on tertiary cathode material, not only increase the electron conduction of tertiary cathode material, and the crystal growth of tertiary cathode material when can also suppress high-temperature process, be conducive to tertiary cathode material and form evengranular nano-scale particle, shorten the migration path of electronics and ion, thus improve the high rate performance of tertiary cathode material; Also effectively inhibit tertiary cathode material charge and discharge process crystal lattice distortion degree, thus significantly improve high rate performance and the stable circulation performance of this tertiary cathode material, improve cycle performance of lithium ion battery.
3, amorphous carbon effectively can reduce the contact area of tertiary cathode material and electrolyte, inhibits the reactivity of tertiary cathode material and electrolyte, improves the security performance of tertiary cathode material.And the network-like of amorphous carbon effectively can also adsorb electrolyte, be conducive to the migration rate improving lithium ion, thus improve the high rate performance of tertiary cathode material.
4, preparation method of the present invention have coated even, simple to operate, cost is low and the feature that efficiency is high, is suitable for industrialization.In addition, the adding of conductive carbon in the present invention, the operation adding conductive carbon and dispersed electro-conductive carbon in follow-up tertiary cathode material application process can be decreased, improve battery make efficiency.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the flow chart of the preparation method of the coated tertiary cathode material of carbon of the present invention;
Fig. 2 is the SEM figure of the coated tertiary cathode material of carbon of the present invention;
Fig. 3 is the high rate performance curve chart of the lithium ion battery of the coated tertiary cathode material of carbon using the present invention to obtain;
Fig. 4 is the cycle performance curve chart of the lithium ion battery of the coated tertiary cathode material of carbon using the present invention to obtain.
Embodiment
As shown in Figure 1, the preparation method of the coated tertiary cathode material of carbon of the present invention, comprises the steps:
S1, with nickel salt, cobalt salt and manganese salt for raw material, preparation ternary anode material precursor.
In this step S1, nickel salt is sulfate, the soluble-salt such as nitrate or hydrochloride of nickel, and cobalt salt is sulfate, the soluble-salt such as nitrate or hydrochloride of cobalt, and manganese salt is sulfate, the soluble-salt such as nitrate or hydrochloride of manganese.Adopt half liquid half to consolidate method and raw material is made ternary anode material precursor; This half liquid half admittedly method first nickel salt, cobalt salt and manganese salt is mixed with mixed solution, adopts liquid-phase precipitation method to obtain the pulp-like mixture of nickel salt, cobalt salt and manganese salt, then adopt low heat temperature solid state reaction to obtain ternary anode material precursor.The chemical formula of obtained ternary anode material precursor is Ni
xco
ymn
1-x-y(OH)
2, wherein, 0<x<1,0<y<1, and x+y<1; Can as 0.2≤x≤0.4,0.3≤y≤0.7 etc.When preparing ternary anode material precursor, the mixed solution concentration of the nickel salt prepared, cobalt salt and manganese salt is 0.2-5mol/L.
S2, preparation conductive carbon dispersion: conductive carbon is scattered in the aqueous solution containing organic carbon source.
In this step S2, conductive carbon is dispersed in and can adopts in ultrasonic method, mechanical mixing method and ball-milling method one or more containing the method in the water of organic carbon source, jitter time is 15-60min(minute), this jitter time is not limited to 15-60min, be uniformly dispersed as long as reach, be less than 15min or more than 60min.Mass volume ratio (g/ml) between conductive carbon and the water containing organic carbon source is 1:10-100.Containing in the water of organic carbon source, the weight percentage of organic carbon source is 10-80%.Wherein, conductive carbon is one or more in graphite, carbon nano-tube, Graphene, acetylene carbon black and superconduction carbon black, organic carbon source be in sucrose, glucose, polyacrylic acid, starch, polyethylene glycol and resorcinol one or more.
S3, ternary anode material precursor and lithium compound to be joined in conductive carbon dispersion, mix, obtain mixture.
In this step S3, lithium compound is one or more in lithium carbonate, lithium hydroxide and lithium chloride.The mass ratio of the conductive carbon in ternary anode material precursor and conductive carbon dispersion is 99.5:0.5-95:5, can adopt corresponding mass ratio according to actual needs, is preferably 99:1-97:3.
S4, mixture to be dried under vacuum.
In this step S4, the temperature of oven dry is 50-200 DEG C, preferred 60-100 DEG C; Time is 0.1-10h(hour), preferred 2-5h.
S5, by the mixture of drying high-temperature process in confined conditions or in the atmosphere of inert gas shielding, obtain the coated tertiary cathode material of carbon, described high temperature is 500-1100 DEG C.
In this step S5; the high temperature furnace that the mixture of drying can be placed in inert gas shielding processes; or do not need inert gas shielding and be placed in airtight high temperature furnace to process and also can; object is that ternary anode material precursor is formed tertiary cathode material, and makes organic carbon source form amorphous carbon through high temperature dehydration carbonization.In closed environment during high-temperature process, wherein can there is a little oxygen, ensure that contributing to ternary anode material precursor while a little oxygen does not affect organic carbon source dehydration carbonization forms tertiary cathode material.Described high temperature is preferably 800-950 DEG C; Processing time is 1-15h, is preferably 6-10h.In the atmosphere of inert gas shielding during high-temperature process, inert gas is one or more in nitrogen and argon gas.The gas flow of inert gas is 0.05-0.2L/min; This gas flow is inert gas is 1m by area
2the gas flow in cross section.
Therefore, in this step S5, after high-temperature process, ternary anode material precursor forms tertiary cathode material, conductive carbon is distributed in tertiary cathode material surface, organic carbon source is formed has network-like amorphous carbon, by conductive carbon and tertiary cathode material coated, obtain carbon coated tertiary cathode material.Wherein, the chemical formula of the tertiary cathode material of formation is LiNi
xco
ymn
1-x-yo
2, wherein, 0<x<1,0<y<1, and x+y<1; Can as 0.2≤x≤0.4,0.3≤y≤0.7 etc.Organic carbon source forms amorphous carbon through high-temperature process dehydration carbonization under anoxic conditions, forms uniform thin layer conductive layer on tertiary cathode material surface, is conducive to the electron conduction increasing tertiary cathode material, thus improves the high rate performance of this material.And the amorphous carbon of this formation has network-like, by network-like, conductive carbon and tertiary cathode material are coated togather, add conductive media or the electron transfer passage of tertiary cathode material and conductive carbon, be conducive to the high rate performance improving tertiary cathode material.When this amorphous carbon can also suppress high-temperature process, the crystal growth of tertiary cathode material, is conducive to tertiary cathode material and forms evengranular nano-scale particle, shortens the migration path of electronics and ion, thus improves the high rate performance of tertiary cathode material.This amorphous carbon is coated on the surperficial also efficiency of tertiary cathode material and suppresses the crystal lattice distortion of this material in charge and discharge process, thus improves the cycle performance of tertiary cathode material; This amorphous carbon effectively can also reduce the contact area of tertiary cathode material and electrolyte, inhibits the reactivity of this material and electrolyte, thus improves the security performance of tertiary cathode material; The network-like of amorphous carbon effectively can also adsorb electrolyte, is conducive to the migration rate improving lithium ion, thus improves the high rate performance of tertiary cathode material.
Preparation method of the present invention have coated even, simple to operate, cost is low and the feature that efficiency is high, is suitable for industrialization.The present invention adds conductive carbon in the process of synthesis of ternary positive electrode, be conducive to conductive carbon equally distributed while, also reduce the operation adding conductive carbon and dispersed electro-conductive carbon in subsequent material application process, improve battery make efficiency.
As shown in Figure 2, the coated tertiary cathode material of the carbon that above-mentioned preparation method obtains, tertiary cathode material 1, conductive carbon 2 can be comprised and there is network-like amorphous carbon 3, conductive carbon 2 be distributed in tertiary cathode material 1 surface, setting carbon 3 by this tertiary cathode material 1 and conductive carbon 2 coated.This amorphous carbon 3 is formed through high-temperature process dehydration carbonization under anoxic conditions by organic carbon source.
Below by way of specific embodiment, the invention will be further described.
Embodiment 1
The mixed solution of S1, the nickelous sulfate stoichiometrically preparing 0.2mol/L, cobaltous sulfate and manganese sulfate, adopts half liquid half to consolidate the presoma Ni of legal system for tertiary cathode material
1/3co
1/3mn
1/3(OH)
2;
5 grams of graphite dispersion in the aqueous solution (weight percentage of sucrose is 10%) of 500 grams of sucrose, stir 15 minutes by S2, employing mechanical mixing method, obtain conductive carbon dispersion;
S3,125 grams of ternary anode material precursor and 55 grams of lithium carbonates are added in conductive carbon dispersion, adopt mechanical mixing method to make it mix, obtain mixture;
S4, by mixture obtained above at 50 DEG C, under vacuumized conditions, dry 10 hours;
S5, by the mixture of oven dry 500 DEG C, nitrogen flow is high-temperature process 15 hours in the high temperature furnace of 0.2L/min, namely obtains the coated tertiary cathode material of carbon.
Embodiment 2
The mixed solution of S1, the nickelous sulfate stoichiometrically preparing 0.5mol/L, cobaltous sulfate and manganese sulfate, adopts half liquid half to consolidate the presoma Ni of legal system for tertiary cathode material
1/3co
1/3mn
1/3(OH)
2;
4 grams of acetylene carbon blacks are scattered in the aqueous solution (weight percentage of glucose is 30%) of 300 grams of glucose by S2, employing mechanical mixing method, and mixing time is 30 minutes;
S3,76 grams of ternary anode material precursor and 45 grams of lithium carbonates are added in conductive carbon dispersion, adopt mechanical mixing method to make it mix, obtain mixture;
S4, by mixture obtained above at 60 DEG C, under vacuumized conditions, dry 5 hours;
S5, by the mixture of drying 800 DEG C, high-temperature process 10 hours in airtight high temperature furnace, namely obtain the coated tertiary cathode material of carbon.
Embodiment 3
The mixed solution of S1, the nickelous sulfate stoichiometrically preparing 1mol/L, cobaltous sulfate and manganese sulfate, adopts half liquid half to consolidate the presoma Ni of legal system for tertiary cathode material
0.4co
0.4mn
0.2(OH)
2;
S2, employing mechanical mixing method are by 3 grams of carbon nanotube disperseds in the aqueous solution (weight percentage of sucrose is 50%) of 250 grams of sucrose, and mixing time is 40 minutes;
S3,97 grams of ternary anode material precursor and 45 grams of lithium carbonates are added in conductive carbon dispersion, adopt mechanical mixing method to make it mix, obtain mixture;
S4, by mixture obtained above at 100 DEG C, under vacuumized conditions, dry 2 hours;
S5, by the mixture of oven dry 800 DEG C, nitrogen flow is high-temperature process 10 hours in the high temperature furnace of 0.1L/min, namely obtains the coated tertiary cathode material of carbon.
Embodiment 4
The mixed solution of S1, the nickelous sulfate stoichiometrically preparing 3mol/L, cobaltous sulfate and manganese sulfate, adopts half liquid half to consolidate the presoma Ni of legal system for tertiary cathode material
0.3co
0.6mn
0.1(OH)
2;
S2, employing mechanical mixing method are by 5 grams of carbon nanotube disperseds in the aqueous solution (weight percentage of sucrose is 70%) of 50 grams of sucrose, and mixing time is 45 minutes;
S3,125 grams of ternary anode material precursor and 55 grams of lithium carbonates are added in conductive carbon dispersion, adopt mechanical mixing method to make it mix, obtain mixture;
S4, by mixture obtained above at 150 DEG C, under vacuumized conditions, dry 3 hours;
S5, by the mixture of drying 950 DEG C, high-temperature process 6 hours in airtight high temperature furnace, namely obtain the coated tertiary cathode material of carbon.
Embodiment 5
The mixed solution of S1, the nickelous sulfate stoichiometrically preparing 5mol/L, cobaltous sulfate and manganese sulfate, adopts half liquid half to consolidate the presoma Ni of legal system for tertiary cathode material
0.2co
0.7mn
0.1(OH)
2;
S2, employing mechanical mixing method are by 5 grams of carbon nanotube disperseds in the aqueous solution (weight percentage of starch is 80%) of 300 grams of starch, and mixing time is 60 minutes;
S3,125 grams of ternary anode material precursor and 55 grams of lithium carbonates are added in conductive carbon dispersion, adopt mechanical mixing method to make it mix, obtain mixture;
S4, by mixture obtained above at 200 DEG C, under vacuumized conditions, dry 30min;
S5, by the mixture of oven dry 1100 DEG C, nitrogen flow is high-temperature process 1 hour in the high temperature furnace of 0.05L/min, namely obtains the coated tertiary cathode material of carbon.
Embodiment 6
The mixed solution of S1, the nickelous sulfate stoichiometrically preparing 4mol/L, cobaltous sulfate and manganese sulfate, adopts half liquid half to consolidate the presoma Ni of legal system for tertiary cathode material
0.2co
0.7mn
0.1(OH)
2;
2 grams of acetylene carbon blacks are scattered in the aqueous solution (weight percentage of glucose is 60%) of 100 grams of glucose by S2, employing mechanical mixing method, and mixing time is 15 minutes;
S3,198 grams of ternary anode material precursor and 60 grams of lithium carbonates are added in conductive carbon dispersion, adopt mechanical mixing method to make it mix, obtain mixture;
S4, by mixture obtained above at 80 DEG C, under vacuumized conditions, dry 4 hours;
S5, by the mixture of drying 900 DEG C, high-temperature process 8 hours in airtight high temperature furnace, namely obtain the coated tertiary cathode material of carbon.
Embodiment 7
The mixed solution of S1, the nickelous sulfate stoichiometrically preparing 3mol/L, cobaltous sulfate and manganese sulfate, adopts half liquid half to consolidate the presoma Ni of legal system for tertiary cathode material
0.2co
0.7mn
0.1(OH)
2;
3 grams of acetylene carbon blacks are scattered in the aqueous solution (weight percentage of glucose is 80%) of 300 grams of glucose by S2, employing mechanical mixing method, and mixing time is 20 minutes;
S3,597 grams of ternary anode material precursor and 200 grams of lithium carbonates are added in conductive carbon dispersion, adopt mechanical mixing method to make it mix, obtain mixture;
S4, by mixture obtained above at 160 DEG C, under vacuumized conditions, dry 3 hours;
S5, by the mixture of oven dry 1000 DEG C, nitrogen flow is high-temperature process 2 hours in the high temperature furnace of 0.2L/min, namely obtains the coated tertiary cathode material of carbon.
In above-described embodiment, high temperature furnace volume can be 1m
3, the area of section that wherein nitrogen passes through is about 1m
2.By the coated tertiary cathode material of carbon obtained by above-described embodiment 1-7, can be as shown in Figure 2.The lithium ion battery of the coated tertiary cathode material of carbon obtained by embodiment 1, adopt new prestige to test the high rate performance of grading system at the test battery of normal temperature and pressure, its high rate performance curve chart can be as shown in Figure 3; Wherein, transverse axis is battery capacity conservation rate, and the longitudinal axis is voltage, and five curves are followed successively by the curve under 3.0C, 2.0C, 1.0C, 0.5C and 0.2C condition from top to bottom.From figure, curve is known, at 0.2C(the top curve) battery capacity conservation rate 100%, at 0.5C battery capacity conservation rate 98%, at 1.0C battery capacity conservation rate 95%, at 2.0C battery capacity conservation rate 92%, at 3.0C(bottom curve) battery capacity conservation rate 88%, thus the lithium ion battery of the coated tertiary cathode material of this carbon of known use, there is high rate capability.
At normal temperatures and pressures, charge and discharge cycles is carried out to using the lithium ion battery of the coated tertiary cathode material of this carbon with the electric current of 1C, new Weir is adopted to test the capacity circulating of cabinet test, carry out 1000 loop tests, the curve chart of testing time and capability retention is as shown in Figure 4, therefrom known, after 1000 magnetic cycle tests, the capability retention 83% of battery, cycle performance is high.
High rate performance curve measured by the lithium ion battery of the coated tertiary cathode material of carbon obtained by embodiment 2 to embodiment 7 is roughly the same with embodiment 1 with cycle performance curve, all has comparatively high rate capability and cycle performance.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various change, combination and change.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within right of the present invention.
Claims (8)
1. a preparation method for the coated tertiary cathode material of carbon, is characterized in that, comprise the following steps:
S1, with nickel salt, cobalt salt and manganese salt for raw material, preparation ternary anode material precursor; The chemical formula of described ternary anode material precursor is Ni
xco
ymn
1-x-y(OH)
2, wherein, 0<x<1,0<y<1, and x+y<1;
S2, preparation conductive carbon dispersion: conductive carbon is scattered in the water containing organic carbon source;
S3, described ternary anode material precursor and lithium compound to be joined in described conductive carbon dispersion, mix, obtain mixture;
S4, described mixture to be dried under vacuum;
S5, by the described mixture of drying in confined conditions or in the atmosphere of inert gas shielding, high-temperature process at 500-1100 DEG C; Described ternary anode material precursor forms tertiary cathode material, and the chemical formula of described tertiary cathode material is LiNi
xco
ymn
1-x-yo
2; Described conductive carbon is distributed in described tertiary cathode material surface, and described organic carbon source is formed has network-like amorphous carbon, by described conductive carbon and tertiary cathode material coated, obtain the coated tertiary cathode material of carbon.
2. the preparation method of the coated tertiary cathode material of carbon according to claim 1, it is characterized in that, in step S1, described nickel salt is the sulfate of nickel, nitrate or hydrochloride, described cobalt salt is the sulfate of cobalt, nitrate or hydrochloride, and described manganese salt is the sulfate of manganese, nitrate or hydrochloride.
3. the preparation method of the coated tertiary cathode material of carbon according to claim 1, is characterized in that, in step S1, adopts half liquid half to consolidate method and described raw material is made ternary anode material precursor;
Described half liquid half admittedly method first described nickel salt, cobalt salt and manganese salt is mixed with mixed solution, adopts liquid-phase precipitation method to obtain the pulp-like mixture of described nickel salt, cobalt salt and manganese salt, then adopt low heat temperature solid state reaction to obtain described ternary anode material precursor;
The mixed solution concentration of described nickel salt, cobalt salt and manganese salt is 0.2-5mol/L.
4. the preparation method of the coated tertiary cathode material of carbon according to claim 1, is characterized in that, in step S2, the mass volume ratio between described conductive carbon and the described water containing organic carbon source is 1:10-100;
Described containing in the water of organic carbon source, the weight percentage of organic carbon source is 10-80%.
5. the preparation method of the coated tertiary cathode material of carbon according to claim 1, it is characterized in that, in step S2, described conductive carbon is one or more in graphite, carbon nano-tube, Graphene, acetylene carbon black and superconduction carbon black, and described organic carbon source is one or more in sucrose, glucose, polyacrylic acid, starch, polyethylene glycol and resorcinol;
In step S3, described lithium compound is one or more in lithium carbonate, lithium hydroxide and lithium chloride.
6. the preparation method of the coated tertiary cathode material of carbon according to claim 1, is characterized in that, in step S3, the mass ratio of the conductive carbon in described ternary anode material precursor and conductive carbon dispersion is 99.5:0.5-95:5.
7. the preparation method of the coated tertiary cathode material of carbon according to claim 1, is characterized in that, in step S5, the gas flow of described inert gas is 0.05-0.2L/min; Described inert gas is one or more in nitrogen and argon gas.
8. the coated tertiary cathode material of carbon, is characterized in that, adopts the preparation method of the coated tertiary cathode material of carbon described in any one of claim 1-7 to obtain.
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