CN107293691A - A kind of positive plate and preparation method and the lithium ion battery including the positive plate - Google Patents
A kind of positive plate and preparation method and the lithium ion battery including the positive plate Download PDFInfo
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- CN107293691A CN107293691A CN201710560304.7A CN201710560304A CN107293691A CN 107293691 A CN107293691 A CN 107293691A CN 201710560304 A CN201710560304 A CN 201710560304A CN 107293691 A CN107293691 A CN 107293691A
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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
- 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
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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
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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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
- 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
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- 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
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention belongs to a kind of positive plate and preparation method and the lithium ion battery including the positive plate；Including aluminium foil and the positive electrode active materials for being located at aluminium foil surface；Positive electrode active materials are made comprising following raw materials according according to parts by weight：10 40 parts of 94 98 parts of positive electrode, 0.1 3 parts of vapor-grown carbon fibers, 13 parts of Kynoar and N methyl pyrrolidones；The chemical formula of positive electrode is：Li4Ni5‑ 3XCo2XYXO8(0 ＜ X ＜ 0.5)；There is destruction during roll-in in the sintered density and intensity, reduction production that anode material for lithium-ion batteries structural stability is good, can improve solid-solution material to material crystal formation, reduce material capacity loss and improve lithium ion battery cyclical stability.
Description
Technical field
The invention belongs to technical field of lithium ion, and in particular to a kind of positive plate and preparation method and including this just
The lithium ion battery of pole piece.
Background technology
Lithium ion battery has output voltage high, and specific energy is high, discharging voltage balance, the characteristics of having extended cycle life.So
Lithium ion battery has been widely used for notebook computer, digital camera, field of mobile phones.And it is increasing dynamic field,
Applied in energy storage field.Dynamic field and energy storage field are different from the single electrical appliance energy of digital domain in several watt-hours to several
Ten watt-hours, they generally require tens kilowatt hours, and even more high energy, separate unit cost is higher, therefore to the cycle life of battery
It it is also proposed higher and higher requirement.
Wherein anode material for lithium-ion batteries stratiform LiNi1/3Co1/3Mn1/3O2 is used as a kind of new lithium ion battery
Positive electrode, its theoretical capacity reaches 278mAh/g.LiNi1/3Co1/3Mn1/3O2 has an a-NaFeO2 type layer structures, Ni for+
Divalent, co is+trivalent, and Mn is+4 valencys, a small amount of Ni3+ and Mn3+.During charging, Mn4+ fixed prices, Ni2+ is changed into Ni4+, and Co3+ becomes
For Co4+.LiNi1/3Co1/3Mn1/3O2, has concentrated LiCoO2, LiNiO2, tri- kinds of respective advantages of material of LiMnO2, still
Because ternary material has generation Jahn-Teller effects in Mn3+ influence, charge and discharge process in building-up process, manganese is caused
Dissolving and electrolyte decomposition.So as to cause, battery capacity is too low, cycle performance is poor.
The content of the invention
A kind of anode material for lithium-ion batteries structure is provided it is an object of the invention to overcome of the prior art not enough
Stability is good, when can improve the sintered density and intensity of solid-solution material, reduce roll-in in production to the destruction of material crystal formation,
Reduce material capacity loss and improve a kind of positive plate and preparation method and lithium including the positive plate of cyclical stability from
Sub- battery.
What an object of the present invention was realized in：The positive plate includes aluminium foil and is located at the positive-active of aluminium foil surface
Material；Described positive electrode active materials are made comprising following raw materials according according to parts by weight：94-98 parts of positive electrode, vapor phase growth
10-40 parts of 0.1-3 parts of Carbon fibe, 1-3 parts of Kynoar and 1-METHYLPYRROLIDONE；The chemical formula of described positive electrode
For：Li4Ni5-3XCo2XYXO8(0 ＜ X ＜ 0.5).
Preferably, the positive plate includes aluminium foil and is located at the positive electrode active materials of aluminium foil surface；Described positive-active material
Material is made comprising following raw materials according according to parts by weight：96 parts of positive electrode, 2 parts of vapor-grown carbon fibers, 2 parts of Kynoar and
30 parts of 1-METHYLPYRROLIDONE；The chemical formula of described positive electrode is：Li4Ni4.7Co0.2Y0.1O8；X=0.1.
A kind of preparation method of positive plate, comprises the following steps：
Step one：After nickel salt aqueous solution, cobalt saline solution, the yttrium salt aqueous solution are well mixed, mixed solution is made；
Step 2：Mixed solution described in step one is placed in reaction vessel, the mixing of ammoniacal liquor and highly basic is added
Liquid, makes reaction solution carry out coprecipitation reaction；The pH value of described reaction solution is 11~12；
Step 3：Sediment after terminating to coprecipitation reaction in step 2 carries out washing and drying, the sediment after drying
Middle addition lithium salts mixed at high speed in ball mill；200~1000rpm of rotating speed of described mixed at high speed, ratio of grinding media to material is 3: 1~10
: 1,8~30h of Ball-milling Time；
Step 4：Mixture in step 3 in ball mill after mixed at high speed was stood after room temperature through high-temperature roasting 24 hours
Size-reduced sieving, is made positive electrode；The temperature of described high-temperature roasting is 800~1100 DEG C, the screen cloth pulverized and sieved
For 100~400 mesh；
Step 5：By the positive electrode described in step 4, vapor-grown carbon fibers, Kynoar and N- methylpyrroles
Alkanone is placed on be uniformly dispersed in planetary high speed dispersing device after, be spread evenly across on aluminium foil, after roll-in be made positive plate；
The thickness of described aluminium foil is 12 μm, and described positive plate thickness is 130 μm.
Preferably, described nickel salt aqueous solution is selected from nickel sulfate solution, nickel nitrate aqueous solution, nickel chloride aqueous solution or vinegar
One of sour nickel aqueous solution；Cobalt saline solution is selected from cobalt sulfate solution, cobalt nitrate aqueous solution, cobalt chloride solution or cobalt acetate water
One of solution；The yttrium salt aqueous solution be selected from the yttrium sulfate aqueous solution, yttrium nitrate aqueous solution, the yttrium chloride aqueous solution or the acetic acid yttrium aqueous solution it
One；The mol ratio of the cobalt in nickel, cobalt saline solution in nickel salt aqueous solution and the yttrium in the yttrium salt aqueous solution is 5-3x: 2x: x, institute
The X stated is more than 0, and less than 0.5.
Preferably, one kind in potassium hydroxide solution, sodium hydroxide solution, lithium hydroxide solution of described highly basic or
It is several.
What the second object of the present invention was realized in：A kind of lithium ion battery, including box hat, lithium-ion electric core, difference
The upper insulating trip and lower insulating trip of lithium-ion electric core upper and lower part are located at, lithium-ion electric core includes being sequentially stacked and winding just
Pole piece, the first barrier film, negative plate and the second barrier film, the positive plate that described positive plate provides for the application.
The present invention is with anode material for lithium-ion batteries structural stability is good, can improve the sintered density of solid-solution material
The destruction, the loss of reduction material capacity and raising lithium ion battery of material crystal formation are circulated during roll-in in being produced with intensity, reduction
The advantage of stability.
Embodiment
The present invention is a kind of positive plate and preparation method and the lithium ion battery including the positive plate, and positive plate includes aluminium
Paper tinsel and the positive electrode active materials for being located at aluminium foil surface；Described positive electrode active materials are comprising following raw materials according according to parts by weight numeral system
Into：94-98 parts of positive electrode, 0.1-3 parts of vapor-grown carbon fibers, 1-3 parts of Kynoar and 1-METHYLPYRROLIDONE 10-40
Part；The chemical formula of described positive electrode is：Li4Ni5-3XCo2XYXO8(0 ＜ X ＜ 0.5).
Preferably, the positive plate includes aluminium foil and is located at the positive electrode active materials of aluminium foil surface；Described positive-active material
Material is made comprising following raw materials according according to parts by weight：96 parts of positive electrode, 2 parts of vapor-grown carbon fibers, 2 parts of Kynoar and
30 parts of 1-METHYLPYRROLIDONE；The chemical formula of described positive electrode is：Li4Ni4.7Co0.2Y0.1O8；X=0.1.
A kind of preparation method of positive plate, comprises the following steps：
Step one：After nickel salt aqueous solution, cobalt saline solution, the yttrium salt aqueous solution are well mixed, mixed solution is made；
Step 2：Mixed solution described in step one is placed in reaction vessel, the mixing of ammoniacal liquor and highly basic is added
Liquid, makes reaction solution carry out coprecipitation reaction；The pH value of described reaction solution is 11~12；
Step 3：Sediment after terminating to coprecipitation reaction in step 2 carries out washing and drying, the sediment after drying
Middle addition lithium salts mixed at high speed in ball mill；200~1000rpm of rotating speed of described mixed at high speed, ratio of grinding media to material is 3: 1~10
: 1,8~30h of Ball-milling Time；
Step 4：Mixture in step 3 in ball mill after mixed at high speed was stood after room temperature through high-temperature roasting 24 hours
Size-reduced sieving, is made positive electrode；The temperature of described high-temperature roasting is 800~1100 DEG C, the screen cloth pulverized and sieved
For 100~400 mesh；
Step 5：By the positive electrode described in step 4, vapor-grown carbon fibers, Kynoar and N- methylpyrroles
Alkanone is placed on be uniformly dispersed in planetary high speed dispersing device after, be spread evenly across on aluminium foil, after roll-in be made positive plate；
The thickness of described aluminium foil is 12 μm, and described positive plate thickness is 130 μm.
Preferably, described nickel salt aqueous solution is selected from nickel sulfate solution, nickel nitrate aqueous solution, nickel chloride aqueous solution or vinegar
One of sour nickel aqueous solution；Cobalt saline solution is selected from cobalt sulfate solution, cobalt nitrate aqueous solution, cobalt chloride solution or cobalt acetate water
One of solution；The yttrium salt aqueous solution be selected from the yttrium sulfate aqueous solution, yttrium nitrate aqueous solution, the yttrium chloride aqueous solution or the acetic acid yttrium aqueous solution it
One；The mol ratio of the cobalt in nickel, cobalt saline solution in nickel salt aqueous solution and the yttrium in the yttrium salt aqueous solution is 5-3x: 2x: x, institute
The X stated is more than 0, and less than 0.5.
Preferably, one kind in potassium hydroxide solution, sodium hydroxide solution, lithium hydroxide solution of described highly basic or
It is several.
Present invention also offers a kind of lithium ion battery, including box hat, lithium-ion electric core, it is respectively provided on lithium-ion electric core
Portion and the upper insulating trip and lower insulating trip of bottom, lithium-ion electric core include positive plate, the first barrier film for being sequentially stacked and winding, and bear
Pole piece and the second barrier film, the positive plate that described positive plate provides for the application.
For the more detailed explanation present invention, further explaination is done to the present invention in conjunction with embodiment.Specific embodiment
It is as follows：
Embodiment one
A kind of positive plate, the positive plate includes aluminium foil and is located at the positive electrode active materials of aluminium foil surface；Described positive pole is lived
Property material is made comprising following raw materials according according to parts by weight：94 parts of positive electrode, 0.1 part of vapor-grown carbon fibers, polyvinylidene fluoride
10 parts of 1 part of alkene and 1-METHYLPYRROLIDONE；The chemical formula of described positive electrode is：Li4Ni4.7Co0.2Y0.1O8, X=0.1.
A kind of preparation method of positive plate, comprises the following steps：
Step one：After nickel salt aqueous solution, cobalt saline solution, the yttrium salt aqueous solution are well mixed, mixed solution is made；
Step 2：Mixed solution described in step one is placed in reaction vessel, the mixing of ammoniacal liquor and highly basic is added
Liquid, makes reaction solution carry out coprecipitation reaction；The pH value of described reaction solution is 11~12；
Step 3：Sediment after terminating to coprecipitation reaction in step 2 carries out washing and drying, the sediment after drying
Middle addition lithium salts mixed at high speed in ball mill；200~1000rpm of rotating speed of described mixed at high speed, ratio of grinding media to material is 10: 1, ball
Consume time 30h；
Step 4：Mixture in step 3 in ball mill after mixed at high speed was stood after room temperature through high-temperature roasting 24 hours
Size-reduced sieving, is made positive electrode；The temperature of described high-temperature roasting is 800~1100 DEG C, the screen cloth pulverized and sieved
For 100~400 mesh；
Step 5：By the positive electrode described in step 4, vapor-grown carbon fibers, Kynoar and N- methylpyrroles
Alkanone is placed on be uniformly dispersed in planetary high speed dispersing device after, be spread evenly across on aluminium foil, after roll-in be made positive plate；
The thickness of described aluminium foil is 12 μm, and described positive plate thickness is 130 μm.
Preferably, described nickel salt aqueous solution is nickel sulfate solution；Cobalt saline solution is cobalt sulfate solution；Yttrium salt water
Solution is the yttrium sulfate aqueous solution；Mole of the cobalt in nickel, cobalt saline solution in nickel salt aqueous solution and the yttrium in the yttrium salt aqueous solution
Than for 5-3x: 2x: x, described X is equal to 0.1.
Preferably, described highly basic is potassium hydroxide solution.
Present invention also offers a kind of lithium ion battery, including box hat, lithium-ion electric core, it is respectively provided on lithium-ion electric core
Portion and the upper insulating trip and lower insulating trip of bottom, lithium-ion electric core include positive plate, the first barrier film for being sequentially stacked and winding, and bear
Pole piece and the second barrier film, the positive plate that described positive plate provides for the application.
Embodiment two
A kind of positive plate, the positive plate includes aluminium foil and is located at the positive electrode active materials of aluminium foil surface；Described positive pole is lived
Property material is made comprising following raw materials according according to parts by weight：98 parts of positive electrode, 3 parts of vapor-grown carbon fibers, Kynoar 3
40 parts of part and 1-METHYLPYRROLIDONE；The chemical formula of described positive electrode is：Li4Ni3.8Co0.8Y0.4O8, X=0.4.
A kind of preparation method of positive plate, comprises the following steps：
Step one：After nickel salt aqueous solution, cobalt saline solution, the yttrium salt aqueous solution are well mixed, mixed solution is made；
Step 2：Mixed solution described in step one is placed in reaction vessel, the mixing of ammoniacal liquor and highly basic is added
Liquid, makes reaction solution carry out coprecipitation reaction；The pH value of described reaction solution is 11~12；
Step 3：Sediment after terminating to coprecipitation reaction in step 2 carries out washing and drying, the sediment after drying
Middle addition lithium salts mixed at high speed in ball mill；200~1000rpm of rotating speed of described mixed at high speed, ratio of grinding media to material is 3: 1, ball
Consume time 8h；
Step 4：Mixture in step 3 in ball mill after mixed at high speed was stood after room temperature through high-temperature roasting 24 hours
Size-reduced sieving, is made positive electrode；The temperature of described high-temperature roasting is 800~1100 DEG C, the screen cloth pulverized and sieved
For 100~400 mesh；
Step 5：By the positive electrode described in step 4, vapor-grown carbon fibers, Kynoar and N- methylpyrroles
Alkanone is placed on be uniformly dispersed in planetary high speed dispersing device after, be spread evenly across on aluminium foil, after roll-in be made positive plate；
The thickness of described aluminium foil is 12 μm, and described positive plate thickness is 130 μm.
Preferably, described nickel salt aqueous solution is nickel nitrate aqueous solution；Cobalt saline solution be cobalt nitrate aqueous solution,；Yttrium salt
The aqueous solution is yttrium nitrate aqueous solution；The cobalt in nickel, cobalt saline solution in nickel salt aqueous solution and the yttrium in the yttrium salt aqueous solution rub
You are than being 5-3x: 2x: x, and described X is equal to 0.4.
Preferably, described highly basic is sodium hydroxide solution.
Present invention also offers a kind of lithium ion battery, including box hat, lithium-ion electric core, it is respectively provided on lithium-ion electric core
Portion and the upper insulating trip and lower insulating trip of bottom, lithium-ion electric core include positive plate, the first barrier film for being sequentially stacked and winding, and bear
Pole piece and the second barrier film, the positive plate that described positive plate provides for the application.
Embodiment three
A kind of positive plate, the positive plate includes aluminium foil and is located at the positive electrode active materials of aluminium foil surface；Described positive pole is lived
Property material is made comprising following raw materials according according to parts by weight：96 parts of positive electrode, 1.55 parts of vapor-grown carbon fibers, polyvinylidene fluoride
25 parts of 2 parts of alkene and 1-METHYLPYRROLIDONE；The chemical formula of described positive electrode is：Li4Ni4.25Co0.5Y0.25O8, X=0.25.
A kind of preparation method of positive plate, comprises the following steps：
Step one：After nickel salt aqueous solution, cobalt saline solution, the yttrium salt aqueous solution are well mixed, mixed solution is made；
Step 2：Mixed solution described in step one is placed in reaction vessel, the mixing of ammoniacal liquor and highly basic is added
Liquid, makes reaction solution carry out coprecipitation reaction；The pH value of described reaction solution is 11~12；
Step 3：Sediment after terminating to coprecipitation reaction in step 2 carries out washing and drying, the sediment after drying
Middle addition lithium salts mixed at high speed in ball mill；200~1000rpm of rotating speed of described mixed at high speed, ratio of grinding media to material is 6.5: 1,
Ball-milling Time 19h；
Step 4：Mixture in step 3 in ball mill after mixed at high speed was stood after room temperature through high-temperature roasting 24 hours
Size-reduced sieving, is made positive electrode；The temperature of described high-temperature roasting is 800~1100 DEG C, the screen cloth pulverized and sieved
For 100~400 mesh；
Step 5：By the positive electrode described in step 4, vapor-grown carbon fibers, Kynoar and N- methylpyrroles
Alkanone is placed on be uniformly dispersed in planetary high speed dispersing device after, be spread evenly across on aluminium foil, after roll-in be made positive plate；
The thickness of described aluminium foil is 12 μm, and described positive plate thickness is 130 μm.
Preferably, described nickel salt aqueous solution is nickel chloride aqueous solution；Cobalt saline solution is cobalt chloride solution；Yttrium salt water
Solution is the yttrium chloride aqueous solution；Mole of the cobalt in nickel, cobalt saline solution in nickel salt aqueous solution and the yttrium in the yttrium salt aqueous solution
Than for 5-3x: 2x: x, described X is equal to 0.25.
Preferably, described highly basic is lithium hydroxide solution.
Present invention also offers a kind of lithium ion battery, including box hat, lithium-ion electric core, it is respectively provided on lithium-ion electric core
Portion and the upper insulating trip and lower insulating trip of bottom, lithium-ion electric core include positive plate, the first barrier film for being sequentially stacked and winding, and bear
Pole piece and the second barrier film, the positive plate that described positive plate provides for the application.
Example IV
A kind of positive plate, the positive plate includes aluminium foil and is located at the positive electrode active materials of aluminium foil surface；Described positive pole is lived
Property material is made comprising following raw materials according according to parts by weight：96 parts of positive electrode, 2 parts of vapor-grown carbon fibers, Kynoar 2
30 parts of part and 1-METHYLPYRROLIDONE；The chemical formula of described positive electrode is：Li4Ni4.7Co0.2Y0.1O8；X=0.1.
A kind of preparation method of positive plate, comprises the following steps：
Step one：After nickel salt aqueous solution, cobalt saline solution, the yttrium salt aqueous solution are well mixed, mixed solution is made；
Step 2：Mixed solution described in step one is placed in reaction vessel, the mixing of ammoniacal liquor and highly basic is added
Liquid, makes reaction solution carry out coprecipitation reaction；The pH value of described reaction solution is 11~12；
Step 3：Sediment after terminating to coprecipitation reaction in step 2 carries out washing and drying, the sediment after drying
Middle addition lithium salts mixed at high speed in ball mill；200~1000rpm of rotating speed of described mixed at high speed, ratio of grinding media to material is 9: 1, ball
Consume time 10h；
Step 4：Mixture in step 3 in ball mill after mixed at high speed was stood after room temperature through high-temperature roasting 24 hours
Size-reduced sieving, is made positive electrode；The temperature of described high-temperature roasting is 800~1100 DEG C, the screen cloth pulverized and sieved
For 100~400 mesh；
Step 5：By the positive electrode described in step 4, vapor-grown carbon fibers, Kynoar and N- methylpyrroles
Alkanone is placed on be uniformly dispersed in planetary high speed dispersing device after, be spread evenly across on aluminium foil, after roll-in be made positive plate；
The thickness of described aluminium foil is 12 μm, and described positive plate thickness is 130 μm.
Preferably, described nickel salt aqueous solution is one of nickel acetate aqueous solution；Cobalt saline solution be the cobalt acetate aqueous solution it
One；The yttrium salt aqueous solution is one of acetic acid yttrium aqueous solution；The cobalt and the yttrium salt aqueous solution in nickel, cobalt saline solution in nickel salt aqueous solution
In the mol ratio of yttrium be 5-3x: 2x: x, described X is equal to 0.1.
Preferably, described highly basic is sodium hydroxide solution and lithium hydroxide solution.
Present invention also offers a kind of lithium ion battery, including box hat, lithium-ion electric core, it is respectively provided on lithium-ion electric core
Portion and the upper insulating trip and lower insulating trip of bottom, lithium-ion electric core include positive plate, the first barrier film for being sequentially stacked and winding, and bear
Pole piece and the second barrier film, the positive plate that described positive plate provides for the application.
Comparative example 1
Compared with Example 1, using without Y3+Positive electrode LiNi1/3Co1/3Mn1/3O2, other are used and embodiment 1
It is identical.
Comparative example 2
Compared with Example 1, using without Y3+Positive electrode LiNi1/3Co1/3Mn1/3O2, in addition, positive plate roll-in is thick
Spend for 120 μm, remaining is same as Example 1.
Method of testing：
Capacity：Standard atmospheric pressure, 25 DEG C ± 2 DEG C of environment temperature, relative humidity be 45%~80% under conditions of, with
0.2C5A electric currents charge, and when battery terminal voltage reaches charging limitation voltage 4.5V, constant-voltage charge are changed to, until charging current is small
In or equal to 0.01C5Stop charging after A, shelve after 10min, with 0.2C5A current discharges, until battery terminal voltage is 3.0V, and
Record the discharge capacity of battery.
Circulation：By above-mentioned charging/discharging thereof retest battery capacity 100 times, and calculate the 100th discharge capacity and the 1st
Secondary discharge capacity is worth ratio.
Compared from above-mentioned test data embodiment 1, embodiment 2, embodiment 3, embodiment 4 with comparative example 1 as can be seen that originally
Invention anode material discharging capacity is more than comparative example discharge capacity of the cell.
From embodiment 5 and the contrast of comparative example 2 as can be seen that 130 μm of positive electrode roll-in thickness drops to 120 μm, to battery
Capacity impact is little, and comparative example 2 and comparative example 1 are contrasted, and roll-in thickness is equally dropped into 120 μm, under battery capacity from 130 μm
Drop is obvious, illustrates that cathode material structure of the present invention is more stable.From loop-around data it is also seen that positive electrode cyclicity of the present invention
Comparative example can be better than, illustrate that the trielement synergistic effect in material crystals of nickel cobalt yttrium is better than nickel cobalt manganese.
Foregoing detailed description is illustrated only for the feasibility embodiment of the present invention, and they are simultaneously not used to
Limit the scope of the invention, all equivalent implementations made without departing from skill spirit of the present invention, change and transformation all should
Within protection scope of the present invention.
Claims (6)
1. a kind of positive plate, it is characterised in that：The positive plate includes aluminium foil and is located at the positive electrode active materials of aluminium foil surface；It is described
Positive electrode active materials be made comprising following raw materials according according to parts by weight：94-98 parts of positive electrode, vapor-grown carbon fibers 0.1-
10-40 parts of 3 parts, 1-3 parts of Kynoar and 1-METHYLPYRROLIDONE；The chemical formula of described positive electrode is：Li4Ni5- 3XCo2XYXO8(0 ＜ X ＜ 0.5).
2. a kind of positive plate according to claim 1, it is characterised in that：The positive plate includes aluminium foil and is located at aluminium foil surface
Positive electrode active materials；Described positive electrode active materials are made comprising following raw materials according according to parts by weight：96 parts of positive electrode, gas
30 parts of 2 parts of phase grown carbon fiber, 2 parts of Kynoar and 1-METHYLPYRROLIDONE；The chemical formula of described positive electrode is：
Li4Ni4.7Co0.2Y0.1O8；X=0.1.
3. a kind of preparation method of positive plate as claimed in claim 1 or 2, it is characterised in that：The preparation method includes as follows
Step：
Step one：After nickel salt aqueous solution, cobalt saline solution, the yttrium salt aqueous solution are well mixed, mixed solution is made；
Step 2：Mixed solution described in step one is placed in reaction vessel, the mixed liquor of ammoniacal liquor and highly basic is added, makes
Reaction solution carries out coprecipitation reaction；The pH value of described reaction solution is 11~12；
Step 3：Sediment after terminating to coprecipitation reaction in step 2 add in washing and drying, the sediment after drying
Enter lithium salts mixed at high speed in ball mill；200~1000rpm of rotating speed of described mixed at high speed, ratio of grinding media to material is 3: 1~10: 1,
8~30h of Ball-milling Time；
Step 4：Mixture in step 3 in ball mill after mixed at high speed was stood after room temperature through powder through high-temperature roasting 24 hours
Broken sieving, is made positive electrode；The temperature of described high-temperature roasting is 800~1100 DEG C, and the screen cloth pulverized and sieved is 100
~400 mesh；
Step 5：By the positive electrode described in step 4, vapor-grown carbon fibers, Kynoar and 1-METHYLPYRROLIDONE
It is placed on after being uniformly dispersed in planetary high speed dispersing device, is spread evenly across on aluminium foil, positive plate is made after roll-in；It is described
The thickness of aluminium foil be 12 μm, described positive plate thickness is 130 μm.
4. a kind of preparation method of positive plate according to claim 3, it is characterised in that：Described nickel salt aqueous solution is selected from
One of nickel sulfate solution, nickel nitrate aqueous solution, nickel chloride aqueous solution or nickel acetate aqueous solution；Cobalt saline solution is selected from cobaltous sulfate
One of the aqueous solution, cobalt nitrate aqueous solution, cobalt chloride solution or cobalt acetate aqueous solution；It is water-soluble that the yttrium salt aqueous solution is selected from yttrium sulfate
One of liquid, yttrium nitrate aqueous solution, the yttrium chloride aqueous solution or acetic acid yttrium aqueous solution；In nickel, cobalt saline solution in nickel salt aqueous solution
Cobalt and the yttrium salt aqueous solution in the mol ratio of yttrium be 5-3x: 2x: x, described X is more than 0, and less than 0.5.
5. a kind of preparation method of positive plate according to claim 3, it is characterised in that：Described highly basic is selected from hydroxide
One or more in potassium solution, sodium hydroxide solution, lithium hydroxide solution.
6. a kind of lithium ion battery, it is characterised in that：Including box hat, lithium-ion electric core, be respectively provided at lithium-ion electric core top and
The upper insulating trip of bottom and lower insulating trip, lithium-ion electric core include positive plate, the first barrier film, negative plate for being sequentially stacked and winding
With the second barrier film, described positive plate is the positive plate described in claim 1 or 2.
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