CN110335999A - The zinc co-doped carbon coating of nitrogen aoxidizes sub- silicon composite and its preparation method and application - Google Patents

The zinc co-doped carbon coating of nitrogen aoxidizes sub- silicon composite and its preparation method and application Download PDF

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CN110335999A
CN110335999A CN201910531165.4A CN201910531165A CN110335999A CN 110335999 A CN110335999 A CN 110335999A CN 201910531165 A CN201910531165 A CN 201910531165A CN 110335999 A CN110335999 A CN 110335999A
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sub
nitrogen
zinc
solution
silicon
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辛利君
王辉
林少雄
许家齐
辛昱
丁楚雄
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Hefei Gotion High Tech Power Energy Co Ltd
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Hefei Guoxuan High Tech Power Energy Co Ltd
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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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
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    • H01M4/00—Electrodes
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    • 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
    • H01M4/483—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides for non-aqueous cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E60/10—Energy storage using batteries

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Abstract

The present invention provides a kind of zinc co-doped carbon coatings of nitrogen to aoxidize sub- silicon composite and its preparation method and application.Preparation method are as follows: the sub- silicon of oxidation is dissolved in organic solvent and forms solution A；Soluble zinc salt is dissolved in organic solvent and forms solution B；Nitrogen-containing heterocycle class organic compound is dissolved in organic solvent and forms solution C；Solution B is added in solution A and is stood；Then upper liquid is removed, surplus solution is mixed with solution C and carries out hydro-thermal reaction；It is dried after reaction and calcining obtains the zinc co-doped sub- silicon composite of carbon coating oxidation of nitrogen under atmosphere of inert gases.The preparation method that the zinc co-doped carbon coating of nitrogen of the present invention aoxidizes sub- silicon composite is easy to operate, no pollution to the environment；With high gram volume, high conductivity, Gao Shouxiao and more stable cycle performance, have broad application prospects in high specific energy batteries and rear end electric vehicle, energy-accumulating power station field.

Description

The zinc co-doped carbon coating of nitrogen aoxidizes sub- silicon composite and its preparation method and application
Technical field
The invention belongs to technical field of composite materials, be related to a kind of zinc co-doped carbon coating of nitrogen aoxidize sub- silicon composite and Preparation method and application.
Background technique
With the increase to high-energy density, the lithium ion battery demand having extended cycle life, researcher is to novel electrode material Material is constantly explored.In recent decades, high theoretical specific capacity of the silicon due to its 4200mAh/g, comparatively safe working voltage With source abundant and widely paid close attention to, it is considered to be most promising next-generation negative electrode material.However, silicon materials exist It is broken with electrode that volume expansion causes reactant particle to crush, so that capacity be caused to drastically reduce and poorly reversible disadvantage.
Compared with silicon, aoxidizing sub- silicon has better cyclical stability, is primarily due to the lithia and lithium silicates generated, Slow down the expansion of volume as a buffer area.In addition, aoxidizing sub- silicon materials has a high theoretical specific capacity, value be higher than than Commercial graphite.
Irreversible reaction occurs however, aoxidizing sub- silicon materials and still facing the generations such as poorly conductive, lithia and lithium silicates When caused head imitates the expansion repeatedly of low, active material and contraction causes circulation the problems such as capacity rapid decay.
Summary of the invention
Based on the technical problems existing in the prior art, the purpose of the present invention is to provide a kind of zinc co-doped carbon coatings of nitrogen Aoxidize sub- silicon composite and preparation method thereof, the preparation method is simple, the composite material prepared have high rate capability, Gao Shouxiao and excellent stable circulation performance；Sub- silicon is aoxidized the object of the invention is also to provide the zinc co-doped carbon coating of the nitrogen to answer Application of the condensation material as negative electrode material in lithium battery；The object of the invention is also to provide include the zinc co-doped carbon packet of the nitrogen Cover the lithium ion cell electrode for aoxidizing sub- silicon composite；The object of the invention is also to provide include the lithium ion battery battery The lithium ion battery of pole.
The purpose of the present invention is achieved by following technological means:
On the one hand, the present invention provides a kind of preparation method of zinc co-doped sub- silicon composite of carbon coating oxidation of nitrogen, packet Include following steps:
The sub- silicon of oxidation is dissolved in organic solvent and forms solution A；
Soluble zinc salt is dissolved in organic solvent and forms solution B；
Nitrogen-containing heterocycle class organic compound is dissolved in organic solvent and forms solution C；
Solution B is added in solution A and is stood；Then upper liquid is removed, surplus solution is mixed with solution C and carries out water Thermal response；
Reaction product is through dry and the zinc co-doped sub- silicon of carbon coating oxidation of calcining acquisition nitrogen is compound under atmosphere of inert gases Material.
In the prior art, it is irreversible to face the generations such as poorly conductive, lithia and lithium silicates generation for the sub- silicon materials of oxidation When head caused by reaction imitates the expansion repeatedly of low, active material and contraction causes circulation the problems such as capacity rapid decay.It is based on This problem, inventor are coated by long-term innovation to sub- silicon is aoxidized, by will aoxidize Asia silicon with it is solvable Property zinc salt mixing standing make to aoxidize sub- silicon face growth in situ and go out zinc skeleton, and then pass through nitrogenous class heterocyclic organic compounds packet It covers, to form metal organic framework compound in aoxidizing sub- silicon face, forms the composite material of carbon coating structure by calcining, It is not only a kind of form being wrapped by terms of physical structure, aoxidizes sub- silicon face growth in situ by zinc ion and nitrogenous chemical combination Metal organic framework compound prepared by object connects using zinc ion as bridge with sub- silicon is aoxidized, after calcining, the structure of material It will not change.In the composite material, nitrogen has the contact area for increasing electrode material surface and electrolyte, enhances ion Transmission rate；Zinc ion has the function of the skeleton of support metal organic framework compound, there is composite material surface more Active site, and part zinc ion can be adulterated into aoxidizing in sub- silicon, will form silicon in the process of intercalation of lithium ion battery Sour zinc, reduce generate this irreversible reaction of lithium metasilicate generation, reduce the consumption of lithium ion, further improve lithium from The coulombic efficiency for the first time of sub- battery；Carbon has the function of enhancing electric conductivity, stablizes the gentle solution volume expansion of the sub- silicon structure of oxidation, The sub- silicon of oxidation has high theoretical specific capacity, and value is higher than than commercial graphite, by the compound coating to the sub- silicon of oxidation, so that system Standby composite material has high gram volume, high conductivity, Gao Shouxiao and more stable cycle performance, and to environment without dirt Dye, has broad application prospects in high specific energy batteries and rear end electric vehicle, energy-accumulating power station field.
In above-mentioned preparation method, it is preferable that the partial size for aoxidizing sub- silicon is less than 10 μm, it is further preferred that the oxygen The partial size for changing sub- silicon is 7 μm.
In above-mentioned preparation method, it is preferable that the soluble zinc salt may include zinc acetate, zinc chloride and zinc nitrate etc. One of or a variety of combinations.
In above-mentioned preparation method, it is preferable that the nitrogen-containing heterocycle class organic compound may include 2-methylimidazole, N- One of acetyl imidazole and N- methylimidazole etc. or a variety of combinations.
In above-mentioned preparation method, it is preferable that the soluble zinc salt, the nitrogen-containing heterocycle class organic compound and described The molar concentration rate for aoxidizing sub- silicon is 1:(2-10): (35-60)；It is further preferred that the soluble zinc salt, the nitrogen-containing heterocycle Class organic compound and the molar concentration rate for aoxidizing sub- silicon are 1:5:45.
In above-mentioned preparation method, as long as used organic solvent can guarantee oxidation sub- silicon, soluble zinc salt, nitrogen-containing heterocycle Class organic compound can dissolve；Preferably, the organic solvent may include methanol and/or n,N-Dimethylformamide (DMF) etc..
In above-mentioned preparation method, it is preferable that it is 12-24h that solution B, which is added to time for standing after solution A, more preferably Ground, solution B are added to the time stood after solution A as 24 hours.Within the scope of this time of repose, it can guarantee that soluble zinc salt exists It aoxidizes sub- silicon face growth in situ and goes out zinc skeleton.
In above-mentioned preparation method, it is preferable that the reaction temperature for carrying out hydro-thermal reaction is 80-100 DEG C；Reaction time is 3- 5h；It is further preferred that the reaction temperature for carrying out hydro-thermal reaction is 100 DEG C；Reaction time is 3h.Using hydro-thermal reaction, thus in It aoxidizes sub- silicon face and forms metal organic framework compound.
In above-mentioned preparation method, it is preferable that dry temperature is 80-100 DEG C after hydro-thermal reaction；Drying time is 12- 24h；It is further preferred that temperature dry after hydro-thermal reaction is 80 DEG C；Drying time is for 24 hours.
In above-mentioned preparation method, it is preferable that the temperature calcined under atmosphere of inert gases is 700-1000 DEG C, is risen Warm speed is 3-5 DEG C/min；Calcination time is 5-8h；Inert gas is that 30-60min is passed through before calcination；
It is further preferred that the temperature calcined under atmosphere of inert gases is 800 DEG C, heating rate is 3 DEG C/min；It forges The burning time is 5h；Inert gas is that 30min is passed through before calcination.
In above-mentioned preparation method, it is preferable that the inert gas may include argon gas and/or nitrogen etc.；More preferably Ground, the inert gas are argon gas.
On the other hand, the present invention also provides a kind of zinc co-doped carbon coatings of nitrogen to aoxidize sub- silicon composite, which is co-doped with Miscellaneous carbon coating, which aoxidizes sub- silicon composite, to be prepared by above-mentioned preparation method.
In another aspect, the present invention also provides the zinc co-doped carbon coatings of above-mentioned nitrogen to aoxidize sub- silicon composite as negative electrode material Application in lithium battery.
In another aspect, the lithium ion cell electrode includes above-mentioned nitrogen zinc the present invention also provides a kind of lithium ion cell electrode Codope carbon coating aoxidizes sub- silicon composite.
In another aspect, the lithium ion battery includes above-mentioned lithium ion battery battery the present invention also provides a kind of lithium ion battery Pole.
Beneficial effects of the present invention:
The preparation method that the zinc co-doped carbon coating of nitrogen of the present invention aoxidizes sub- silicon composite is easy to operate, to environment without dirt Dye；With high gram volume, high conductivity, Gao Shouxiao and more stable cycle performance, high specific energy batteries and rear end electric vehicle, Energy-accumulating power station field has broad application prospects.
Detailed description of the invention
Fig. 1 is the oxidation that the zinc co-doped carbon coating of 1 nitrogen of the embodiment of the present invention aoxidizes sub- silicon composite and do not coated The charging and discharging curve comparison diagram of the button electrode slice of sub- silicon materials；
Fig. 2 is the oxidation that the zinc co-doped carbon coating of 1 nitrogen of the embodiment of the present invention aoxidizes sub- silicon composite and do not coated The cyclic curve comparison diagram of the button electricity of sub- silicon materials.
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, now to skill of the invention Art scheme carries out described further below, but should not be understood as that limiting the scope of the invention.
It is commercially available acquisition if chemical reagent employed in following embodiment is without specified otherwise, purity grade is Chemistry is pure.
Embodiment 1:
The present embodiment provides the preparation methods that a kind of zinc co-doped carbon coating of nitrogen aoxidizes sub- silicon composite comprising following Step:
The oxidation Asia Si powder that 8g partial size is about 7 μm is dissolved in 50mL methanol solution by step 1, obtains solution A；It will Zn (the CH of 0.004moL3COO)2·2H2O is dissolved in 50mL methanol solution, obtains solution B；By the 2-methylimidazole of 0.02moL It is dissolved in 50mL methanol solution, obtains solution C；
Solution B is slowly added into solution A and stands for 24 hours by step 2, so that zinc acetate be promoted to aoxidize sub- silicon face Growth in situ goes out zinc skeleton, then removes upper liquid, and surplus solution is added in solution C and is placed in reaction kettle in 80 DEG C of progress Hydro-thermal reaction 5h, to form metal organic framework compound in aoxidizing sub- silicon face.
Step 3, the solid being centrifuged after hydro-thermal reaction be put into 80 DEG C of baking oven it is dry for 24 hours；Then by the solid after drying It is put into porcelain boat, porcelain boat is put into tube furnace later, 30min is passed through argon gas before calcining heats up, then with the heating speed of 3 DEG C/min Degree is warming up to 800 DEG C, and in this temperature lower calcination 5h, obtains the zinc co-doped carbon coating of nitrogen and aoxidize sub- silicon composite.
Embodiment 2:
The present embodiment provides the preparation methods that a kind of zinc co-doped carbon coating of nitrogen aoxidizes sub- silicon composite comprising following Step:
The oxidation Asia Si powder that 10g partial size is about 7 μm is dissolved in 50mL methanol solution by step 1, obtains solution A；It will The zinc chloride of 0.004moL is dissolved in 50mL methanol solution, obtains solution B；The N- acetyl imidazole of 0.016moL is dissolved in 50mL In methanol solution, solution C is obtained；
Solution B is slowly added into solution A and is stood 20h by step 2, so that zinc acetate be promoted to aoxidize sub- silicon face Growth in situ goes out zinc skeleton, then removes upper liquid, surplus solution is added in solution C be placed in reaction kettle in 100 DEG C into Row hydro-thermal reaction 5h, to form metal organic framework compound in aoxidizing sub- silicon face.
Step 3, the solid being centrifuged after hydro-thermal reaction are put into dry 12h in 100 DEG C of baking oven；Then by consolidating after drying Body is put into porcelain boat, and porcelain boat is put into tube furnace later, and 50min is passed through argon gas before calcining heats up, then with the heating of 5 DEG C/min Speed is warming up to 900 DEG C, and in this temperature lower calcination 6h, obtains the zinc co-doped carbon coating of nitrogen and aoxidize sub- silicon composite.
Comparative experiments:
The zinc co-doped carbon coating of nitrogen that embodiment 1 is prepared is aoxidized sub- silicon composite to glue with Super p and silicon substrate It ties the proportion that agent ratio by weight is 91:2:7 to mix, be coated on copper foil by closing slurry, 80 DEG C of oven dryings obtain pole afterwards for 24 hours Piece, pole piece after as coating；
It is uncoated pole piece that the sub- silicon of uncoated oxidation, which is equally prepared pole piece according to same step,.
Using lithium metal as cathode, Celgard2400 is diaphragm, is contained for pole piece and uncoated pole piece after taking cladding respectively EC+DMC (volume ratio 1:1) solution of the LiPF6 of 1mol/L and 10% mass ratio FEC are electrolyte, in argon atmosphere glove box Then 2032 type button cells of interior assembling carry out electrochemical property test (charging/discharging voltage section is 0-1.5V).Experimental result As shown in Figure 1.
As seen from Figure 1, under conditions of 0.1C multiplying power, charge and discharge section are 0-1.5V, the composite material of embodiment 1 Discharge capacity reaches 2083.03mAh/g to the pole piece of preparation for the first time, and the pole piece of the sub- silicon materials preparation of uncoated oxidation discharges for the first time Capacity is only 2019.29mAh/g；Under the conditions of 0.1C rate of charge, the pole piece initial charge of the composite material preparation of embodiment 1 Capacity reaches 1607.36mAh/g, and the pole piece initial charge capacity of the material preparation of the sub- silicon of uncoated oxidation is only 1157.10mAh/g；The pole piece head effect of the composite material preparation of embodiment 1 is increased to 77.16% from 57.30%, and bent from electric discharge Line current potential can be seen that the covering material of embodiment 1 shows lesser polarization, it can thus be seen that sub- compared to uncoated oxidation Silicon materials, composite material of the invention have higher specific discharge capacity and first effect.Meanwhile it can from the button electricity cyclic curve of Fig. 2 To find out, under the conditions of 0.1C rate charge-discharge, the composite material of embodiment 1 has more excellent electrochemistry cycle performance.

Claims (10)

1. the preparation method that a kind of zinc co-doped carbon coating of nitrogen aoxidizes sub- silicon composite comprising following steps:
The sub- silicon of oxidation is dissolved in organic solvent and forms solution A；
Soluble zinc salt is dissolved in organic solvent and forms solution B；
Nitrogen-containing heterocycle class organic compound is dissolved in organic solvent and forms solution C；
Solution B is added in solution A and is stood；Then upper liquid is removed, surplus solution mixes with solution C to carry out hydro-thermal anti- It answers；
Reaction product is through dry and the zinc co-doped carbon coating of calcining acquisition nitrogen aoxidizes sub- silicon composite under atmosphere of inert gases.
2. preparation method according to claim 1, it is characterised in that: the partial size for aoxidizing sub- silicon is less than 10 μm；It is preferred that Ground, the partial size for aoxidizing sub- silicon is 7 μm；
Preferably, the soluble zinc salt includes one of zinc acetate, zinc chloride and zinc nitrate or a variety of combinations；
Preferably, the nitrogen-containing heterocycle class organic compound includes in 2-methylimidazole, N- acetyl imidazole and N- methylimidazole One or more combinations.
3. preparation method according to claim 1 or 2, it is characterised in that: the soluble zinc salt, the nitrogen-containing heterocycle class Organic compound and the molar concentration rate for aoxidizing sub- silicon are 1:(2-10): (35-60)；
Preferably, the soluble zinc salt, the nitrogen-containing heterocycle class organic compound and the molar concentration rate for aoxidizing sub- silicon For 1:5:45.
4. preparation method according to claim 1, it is characterised in that: the organic solvent includes methanol and/or N, N- bis- Methylformamide.
5. preparation method according to claim 1, it is characterised in that: solution B is added to the time stood after solution A and is 12-24h；It is further preferred that it is for 24 hours that solution B, which is added to the time stood after solution A,；
Preferably, the reaction temperature for carrying out hydro-thermal reaction is 80-100 DEG C；Reaction time is 3-5h；
It is further preferred that the reaction temperature for carrying out hydro-thermal reaction is 100 DEG C；Reaction time is 3h；
Preferably, temperature dry after hydro-thermal reaction is 80-100 DEG C；Drying time is 12-24h；
It is further preferred that temperature dry after hydro-thermal reaction is 80 DEG C；Drying time is for 24 hours.
6. preparation method according to claim 1, it is characterised in that: the temperature calcined under atmosphere of inert gases is 700-1000 DEG C, heating rate is 3-5 DEG C/min；Calcination time is 5-8h；Inert gas is that 30-60min is passed through before calcination；
It is further preferred that the temperature calcined under atmosphere of inert gases is 800 DEG C, heating rate is 3 DEG C/min；When calcining Between be 5h；Inert gas is that 30min is passed through before calcination；
Preferably, the inert gas includes argon gas and/or nitrogen；
It is further preferred that the inert gas is argon gas.
7. a kind of zinc co-doped carbon coating of nitrogen aoxidizes sub- silicon composite, it is characterised in that: the zinc co-doped carbon coating oxidation of the nitrogen Sub- silicon composite is prepared by any one of the claim 1-6 preparation method.
8. the zinc co-doped sub- silicon composite of carbon coating oxidation of nitrogen described in claim 7 answering in lithium battery as negative electrode material With.
9. a kind of lithium ion cell electrode, it is characterised in that: the lithium ion cell electrode includes that nitrogen zinc described in claim 7 is co-doped with Miscellaneous carbon coating aoxidizes sub- silicon composite.
10. a kind of lithium ion battery, it is characterised in that: the lithium ion battery includes lithium ion cell electrode described in claim 9.
CN201910531165.4A 2019-06-19 2019-06-19 The zinc co-doped carbon coating of nitrogen aoxidizes sub- silicon composite and its preparation method and application Pending CN110335999A (en)

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CN110931785B (en) * 2019-12-11 2022-09-30 河南创力新能源科技股份有限公司 Preparation method of zinc-nickel battery cathode silicate crystal material
CN115537906A (en) * 2022-10-27 2022-12-30 合肥国轩高科动力能源有限公司 Modified single crystal ternary cathode material, preparation method thereof and lithium ion battery
CN115537906B (en) * 2022-10-27 2024-05-28 合肥国轩高科动力能源有限公司 Modified monocrystal ternary positive electrode material, preparation method thereof and lithium ion battery
CN115893425A (en) * 2022-11-28 2023-04-04 北京化工大学 Silicon oxide/carbon nanotube composite material and application thereof in lithium ion battery cathode

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