CN101197436A - Positive plate of lithium ion secondary battery, and battery including the same - Google Patents
Positive plate of lithium ion secondary battery, and battery including the same Download PDFInfo
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- CN101197436A CN101197436A CNA2006101611629A CN200610161162A CN101197436A CN 101197436 A CN101197436 A CN 101197436A CN A2006101611629 A CNA2006101611629 A CN A2006101611629A CN 200610161162 A CN200610161162 A CN 200610161162A CN 101197436 A CN101197436 A CN 101197436A
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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 relates to an anode plate of a lithium ion secondary battery. The anode plate comprises a conductive substrate and anode material layers coated on the two sides of the conductive substrate, wherein the anode material layers contain an anode active substance and adhesive. The anode active substance contains phosphoric acid lithium salt of an olivine structure. The density of the two anode material layers is between 10 to 40 mg/m2; the diameter of the phosphoric acid lithium salt particle is between 0.5 to 5 microns. The invention also relates to a lithium ion secondary battery which includes the anode plate provided by the invention. The lithium ion secondary battery made of the anode plate of a lithium ion secondary battery of the invention has high rate, heavy currency and high safety performance and is suited to being used as a power cell.
Description
Technical field
The present invention relates to a kind of positive plate of lithium rechargeable battery, also relate to the lithium rechargeable battery that comprises this positive plate.
Background technology
In general, the positive plate of lithium rechargeable battery contains conducting base and is coated in the positive electrode material layer on this conducting base two sides, and described positive electrode material layer contains positive active material and binding agent, also contains conductive agent sometimes.In order to guarantee that lithium rechargeable battery has higher capacity, the two-sided surface density that requires the lithium ion secondary battery positive electrode pole piece is more than or equal to 40 milligrams/centimetre
2
In the positive active material of commercial at present lithium rechargeable battery, lithium cobalt oxygen (LiCoO
2) rely on good circulation (reversible discharging and recharging greater than 500 times) and bigger discharge capacity (140 Milliampere Hour/gram) and high discharge platform and occupied the market share greater than 95%.But LiCoO
2The defective that can't remedy is arranged itself, the one, cobalt belongs to rare metal, and the reserves in the earth's crust are few, thereby cost an arm and a leg; The 2nd, LiCoO
2As the battery of positive electrode over-charging of battery or when overheated can with electrolyte generation vigorous reaction, emits a large amount of heats and cause battery to catch fire or explode, so security performance is relatively poor.
Since the eighties of last century the nineties, the low lithium nickel oxygen (LiNiO that simultaneously environment is not had pollution of price
2), nickel manganese oxygen (LiMn
2O
4) be considered to most possibly to substitute LiCoO always
2Material.
Studies show that in recent years, LiNiO
2The layer structure poor stability, stoichiometric LiNiO
2Be difficult at low temperatures synthesize, and the mixing occupy-place of lithium nickel can take place under the high temperature synthesis condition.By the control of accurate condition (in the oxygen atmosphere under 750 ℃ of temperature roast 24 hours), just can synthesize LiNiO
2It is that higher initial specific capacity (initial charge capacity reaches 200 Milliampere Hour/grams) is arranged, but cycle performance is poor especially, and capacity promptly is lower than LiCoO after 10 circulations
2
LiMn
2O
4Though synthetic simple, low price and fail safe are good, LiMn
2O
4Specific capacity little (120 Milliampere Hour/gram), and the cycle life of (for example more than 55 ℃) is relatively poor under hot conditions, and although mix and chemical surface treatment through composition, cycle life still can't satisfy the requirement of actual use.Therefore, lithium battery industry, particularly high-power dynamic lithium battery needs that a kind of cost is lower, capacity more greatly and safer positive active material.
CN1821063A discloses the method for the spherical phosphate metal salt of a kind of synthetic class, this phosphate metal salt LiMPO
4Can be used as a kind of cathode material for lithium ion battery, it is good to have a cycle performance, the advantage that security performance is good.
Summary of the invention
The object of the present invention is to provide a kind of positive plate that makes lithium rechargeable battery have the lithium rechargeable battery of high magnification, heavy-current discharge performance, and the lithium rechargeable battery that comprises this positive plate is provided.
The invention provides a kind of positive plate of lithium rechargeable battery, this positive plate contains conducting base and is coated in the positive electrode material layer on this conducting base two sides, described positive electrode material layer contains positive active material and binding agent, described positive active material contains the phosphate metal lithium salts of olivine structural, wherein, the two-sided surface density of described positive electrode material layer is 10 to less than 40 milligrams/centimetre
2, the particle diameter of described phosphate metal lithium salts is the 0.5-5 micron.
The present invention also provides a kind of lithium rechargeable battery, this lithium rechargeable battery comprises battery container, electrode group and electrolyte, electrode group and electrolyte are sealed in the battery container, the electrode group comprises reels or stacked positive plate, barrier film and negative plate successively, wherein, described positive plate is a positive plate of the present invention.
The positive active material that the anode pole piece of lithium rechargeable battery provided by the invention adopts is the phosphate metal lithium salts of the olivine structural of particle diameter 0.5-5 micron, and two-sided surface density is different from conventional two-sided surface density fully, is 10 to less than 40 milligrams/centimetre
2The amount that the positive plate provided by the invention of such combination applies under identical dressing area is less, the positive plate thinner thickness, therefore make lithium ion between positive/negative plate, take off the distance weak point of embedding and embedding process, help the embedding of taking off of interior a large amount of lithium ions of short time, therefore, adopt the big electric current of the lithium rechargeable battery of positive plate provided by the invention, big multiplying power discharging property to be greatly enhanced, and, surprisingly, simultaneously, the reduction of two-sided surface density, the unobvious capacity that reduces battery.In addition, because this body structure of olivine structural metallic compound lithium salts is more stable, so adopt the lithium rechargeable battery of positive plate provided by the invention also to have higher safety performance.
Embodiment
The positive plate of lithium rechargeable battery of the present invention, contain conducting base and the positive electrode material layer that is coated in this conducting base two sides, described positive electrode material layer contains positive active material and binding agent, described positive active material contains the phosphate metal lithium salts of olivine structural, wherein, the two-sided surface density of described positive electrode material layer is 10 to less than 40 milligrams/centimetre
2, the particle diameter of described phosphate metal lithium salts is the 0.5-5 micron.
According to the present invention, the make a comment or criticism ratio of area of the quality of double-side material layer of utmost point material layer and this material layer of the two-sided surface density of described positive electrode material layer.
According to the positive plate of lithium rechargeable battery provided by the invention, the phosphate metal lithium salts that adopts olivine structural is as positive active material, and the molecular formula of this phosphate metal lithium salts is LiMPO
4, wherein M be among Fe, Mn, Co or the Ni one or more.
The phosphate metal lithium salts of olivine structural is because this body structure is more stable, and the bond energy of P-O is very high, and therefore in the ordinary course of things, the P-O key is not easy fracture, also can precipitated oxygen.And at LiCoO
2In the structure, Co-O key fragility, overcharge or hot conditions under the Co-O bond fission, precipitated oxygen causes potential safety hazard.So the battery that adopts olivine structural phosphate metal lithium salts to make has high security performance.
The olivine structural phosphate metal lithium salts that battery anode slice of the present invention adopted, its particle diameter requires between the 0.5-5 micron.This is because the olivine structural phosphate metal lithium salts of this particle diameter can shorten the distance that lithium ion takes off embedding and embedding when discharging and recharging, and accelerates the carrying out of redox reaction, thereby improves the multiplying power discharging property of battery.When particle diameter is lower than 0.5 micron, fall to expect the film-making processing difficulties easily during anodal slurry film-making.When particle diameter was higher than 5 microns, it is oversize that lithium ion takes off the distance of embedding and embedding, and redox reaction speed slows down, the high rate performance variation.
Positive plate according to lithium rechargeable battery provided by the invention, wherein, particle diameter is that the phosphate metal lithium salts of the olivine structural of 0.5-5 micron can be by commercially available, the LiFePO4 produced of Tianjin guide Co., Ltd for example, also can obtain, for example disclosed method among the CN1821063A by any known preparation method.
According to the positive plate of lithium rechargeable battery provided by the invention, wherein, described conducting base is conventionally known to one of skill in the art, for example can be selected from aluminium foil, Copper Foil or various Punching steel strip.
Positive plate according to lithium rechargeable battery provided by the invention, wherein, the kind of described binding agent and content are conventionally known to one of skill in the art, for example, described binding agent can be selected from fluorine resin and/or polyolefin compound, as in polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) or the butadiene-styrene rubber (SBR) one or more.In general, the content of described binding agent is the 0.01-8 weight % of positive active material, is preferably 1-5 weight %.
Positive plate according to lithium rechargeable battery provided by the invention, in the preferred case, described positive electrode active materials can also contain conductive agent, the kind of described conductive agent and content are conventionally known to one of skill in the art, for example, described conductive agent can be selected from one or more in acetylene black, conductive carbon black and the electrically conductive graphite.The content of described conductive agent is the 0-15 weight % of positive active material, is preferably 0.5-10 weight %.
The positive plate of lithium rechargeable battery of the present invention can adopt the known existing method preparation of those skilled in the art.For example, the preparation method of conventional positive plate comprises, positive active material is become slurries with binding agent with solvent, can also add conductive agent in slurries, applies these slurries then on the wide cut conducting base, and then dry, rolling is also cut, and obtains positive plate.
Wherein, the solvent that mixes with positive active material and binding agent can be selected from and well known to a person skilled in the art conventional solvent, as being selected from N-methyl pyrrolidone (NMP), dimethyl formamide (DMF), diethylformamide (DEF), dimethyl sulfoxide (DMSO) (DMSO), oxolane (THF) and water and the alcohols one or more.The consumption of solvent can be coated on the described conducting base described slurry and gets final product.In general, it is 40-90 weight % that the consumption of solvent makes the content of positive active material in the slurries, is preferably 50-85 weight %.
Condition dry and roll-in is known in those skilled in the art, and for example the temperature of dry positive plate is generally 60-120 ℃, and preferred 80-110 ℃, be 0.5-5 hour drying time.
Through roll-in and the two-sided surface density of the positive plate after cutting require to reach 10 to less than 40 milligrams/centimetre
2Between.When the two-sided surface density of positive plate was too little, positive plate length was oversize, and it is serious that battery space is disabled physical waste, caused the capacity of battery too low.When the two-sided surface density of positive plate is too big, then under identical positive plate area, the corresponding thickening of positive plate thickness, cause the distance of taking off embedding and embedding process of lithium ion between positive and negative electrode big, lithium ion take off embedding and the embedding ability is affected, the multiplying power discharging property of battery, heavy-current discharge performance variation.
Two-sided surface density provided by the invention is 10 to less than 40 milligrams/centimetre
2Between the anode pole piece of lithium rechargeable battery, less than the two-sided surface density of routine " more than or equal to 40 milligrams/centimetre
2"; make the amount that under identical dressing area, applies less, the positive plate thinner thickness, so make lithium ion between positive/negative plate, take off embedding and the distance weak point that embeds process; help the embedding of taking off of interior lithium ions in a large number of short time, thereby improved the big electric current of battery, big multiplying power discharging property greatly.
Lithium rechargeable battery provided by the invention comprises battery container, electrode group and electrolyte, electrode group and electrolyte are sealed in the battery container, the electrode group comprises reels or stacked positive plate, barrier film and negative plate successively, and wherein, described positive plate is a positive plate provided by the invention.
The structure of described electrode group is conventionally known to one of skill in the art, and in general, described electrode group comprises reels or stacked positive plate, barrier film and negative plate successively, and barrier film is between positive plate and negative plate.Coiling or stacked mode are conventionally known to one of skill in the art.
Described negative pole adopts known negative pole in this area, promptly contains negative current collector and the negative electrode material layer that is coated on this negative current collector.Anticathode material layer of the present invention has no particular limits, and is the same with prior art, and described negative electrode material layer generally includes the conductive agent that negative electrode active material, binding agent and selectivity contain.Described negative electrode active material can adopt various negative electrode active materials commonly used in the prior art, for example material with carbon element.Described material with carbon element can be non-graphitized charcoal, graphite or the charcoal that obtained by high-temperature oxydation by polyyne family macromolecule material, also can use other material with carbon element for example pyrolytic carbon, coke, organic polymer sinter, active carbon etc.Described organic polymer sinter can be by the product with gained after sintering such as phenolic resins, epoxy resin and the charing.
Described binding agent can be the various binding agents that are used for lithium secondary battery anode in the prior art, and preferred described binding agent is the mixture of hydrophobicity binding agent and hydrophilic agglomerant.The ratio of described hydrophobicity binding agent and hydrophilic agglomerant has no particular limits, and can determine according to actual needs, and for example, the part by weight of hydrophilic agglomerant and hydrophobicity binding agent can be 0.3: 1-1: 1.Described binding agent can use with the aqueous solution or emulsion form, also can use with solid form, preferably use with the aqueous solution or emulsion form, have no particular limits the concentration of described hydrophilic agglomerant solution and the concentration of described hydrophobicity binding agent emulsion this moment, can adjust flexibly this concentration according to the viscosity of the cathode size slurry coating that will prepare and the requirement of operability, the concentration of for example described hydrophilic agglomerant solution can be 0.5-4 weight %, and the concentration of described hydrophobicity binding agent emulsion can be 10-80 weight %.Described hydrophobicity binding agent can be polytetrafluoroethylene or butadiene-styrene rubber or their mixture.Described hydrophilic agglomerant can be in hydroxypropyl methylcellulose, sodium carboxymethylcellulose, hydroxyethylcellulose or the polyvinyl alcohol one or more.
Negative material provided by the invention can also optionally contain the common conductive agent that contains in the prior art negative material.Because conductive agent is used to increase the conductivity of electrode, reduce the internal resistance of battery, so the present invention preferably contains conductive agent.The content of described conductive agent and kind are conventionally known to one of skill in the art, for example, are benchmark with the negative material, and the content of conductive agent is generally 0.1-12 weight %.Described conductive agent can be selected from one or more in conductive carbon black, nickel powder, the copper powder.
The preparation method of negative pole can adopt the whole bag of tricks known in the field, for example the conductive agent that negative electrode active material, binding agent and selectivity is contained with solvent is prepared into the negative material slurry, the addition of solvent is known in those skilled in the art, and the viscosity that can be coated with according to the slurry of the cathode size that will prepare and the requirement of operability are adjusted flexibly.Then prepared negative material slurry slurry is coated in dry compressing tablet on the negative electrode collector, cut-parts obtain negative pole again.The temperature of described drying is generally 120 ℃, and be generally 5 hours drying time.
Described solvent can be an all kinds of solvents of the prior art, and as water, water-soluble solvent or their mixture, described water-soluble solvent comprises that carbon number is lower alcohol, acetone, the N of 1-6, dinethylformamide etc.
According to lithium rechargeable battery provided by the invention, membrane layer is arranged between positive pole and the negative pole, has electrical insulation capability and liquid retainability energy.Described membrane layer can be selected from and well known to a person skilled in the art various membrane layers used in the lithium rechargeable battery, for example polyolefin micro porous polyolefin membrane, polyethylene felt, glass mat or ultra-fine fibre glass paper.
According to lithium rechargeable battery provided by the invention, electrolyte is nonaqueous electrolytic solution.Described nonaqueous electrolytic solution is the solution that electrolyte lithium salt forms in nonaqueous solvents, can use the nonaqueous electrolytic solution of routine well known by persons skilled in the art.Can be selected from lithium hexafluoro phosphate (LiPF such as electrolyte lithium salt
6), lithium perchlorate (LiClO
4), LiBF4 (LiBF
4), hexafluoroarsenate lithium (LiAsF
6), hexafluorosilicic acid lithium (LiSiF
6), tetraphenyl lithium borate (LiB (C
6H
5)
4), lithium chloride (LiCl), lithium bromide (LiBr), chlorine lithium aluminate (LiAlCl
4) and fluorocarbon based sulfonic acid lithium (LiC (SO
2CF
3)
3), LiCH
3SO
3, LiN (SO
2CF
3)
2In one or more.Nonaqueous solvents can be selected from chain acid esters and ring-type acid esters mixed solution, wherein the chain acid esters can be fluorine-containing for dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), carbonic acid first propyl ester (MPC), dipropyl carbonate (DPC) and other, sulfur-bearing or contain in the chain organosilane ester of unsaturated bond one or more.The ring-type acid esters can (γ-BL), sultone and other be fluorine-containing, sulfur-bearing or contain in the ring-type organosilane ester of unsaturated bond one or more for ethylene carbonate (EC), propene carbonate (PC), vinylene carbonate (VC), gamma-butyrolacton.In described nonaqueous electrolytic solution, the concentration of electrolyte lithium salt is generally the 0.1-2 mol, is preferably the 0.8-1.2 mol.
According to lithium rechargeable battery provided by the invention, the preparation method of this battery is as well known to those skilled in the art, in general, the preparation method of this battery comprises the electrode group is inserted in the battery case, add electrolyte, sealing obtains lithium rechargeable battery then.Wherein, the method for sealing, the consumption of electrolyte is conventionally known to one of skill in the art.
The following examples will the invention will be further described.
Embodiment 1
Present embodiment illustrates positive pole and the lithium rechargeable battery and the preparation thereof of lithium rechargeable battery provided by the invention.
(1) preparation of positive plate
With 100 weight portion particle diameters 0.5 micron LiFePO
4(production of Tianjin guide company), 5 weight portion binding agent polyvinylidene fluoride (PVDF), 8 weight portion conductive agent acetylene blacks join in the 80 weight portion N-methyl pyrrolidones (NMP), stir then to form in de-airing mixer and stablize, disperse equably the positive electrode slurry.With this anode sizing agent be coated in equably wide be 400 millimeters, thick be the both sides of 20 microns wide cut aluminium foil, then, in 100 ℃ of following vacuum dryings, rolling, on cutting machine, cut into 385 millimeters * 42 millimeters positive plate, wherein contain 3.12 gram active component LiFePO
4
The pressure that adopts 2.0 MPas is with the positive plate roll-in, and the two-sided surface density of positive plate is 14 milligrams/centimetre
2
(2) preparation of negative plate
Native graphite (the industrial trade mark that the FDAC company that changes into produces is MAG), 4 weight portion polyfluortetraethylene of binding element (PTFE), the 4 weight portion conductive agent carbon blacks of 100 weight portion negative electrode active materials are joined in the 40 weight portion methyl-sulfoxides (DMSO), add 0.3 weight portion dispersant (polyisobutene succinimide: poly(ethylene oxide) ether=1: 1), in de-airing mixer, stir then and form negative material slurry stable, homogeneous again.With cathode size be coated on equably wide be 400 millimeters, thick be on 10 microns the wide cut Copper Foil, after 120 ℃ of oven dry, rolling, obtain wide be 400 millimeters, thick be 145 microns the wide cut Copper Foil that contains negative material, on cutting machine, cut grow up 43 millimeters, wide 355 millimeters negative plate, wherein contain 1.36 gram negative electrode active material native graphites.
Adopt the pressure of 1.5 MPas that negative plate is carried out roll-in.
(3) assembling of battery
With LiPF
6Be configured to LiPF with ethylene carbonate (EC) and diethyl carbonate (DEC)
6Concentration is the solution (volume ratio of EC/DEC is 1: 1) of 1.0 mol, obtains nonaqueous electrolytic solution.Positive plate, membrane layer that (1) is obtained, (2) negative plate that obtains is successively with the stacked electrode group that is wound into scroll of up-coiler, the electrode group that obtains is put into the battery steel shell of an end opening, the amount of above-mentioned nonaqueous electrolytic solution with 4.0g/Ah added in this battery case, promptly get LP053048 square lithium ion secondary battery of the present invention after the sealing.Described membrane layer is polyethylene (PE) diaphragm paper.
Embodiment 2-6
The following examples illustrate positive pole and the lithium rechargeable battery and the preparation thereof of lithium rechargeable battery provided by the invention.
The following examples 2-6 prepares the LP053048 square lithium ion secondary battery according to the step of embodiment 1, and that different is positive active material LiFePO
4The particle diameter and the two-sided surface density of positive plate different, table 1 has been listed LiFePO among each embodiment
4Particle diameter and the two-sided surface density of positive plate.
Battery performance test
(1) test of battery capacity: the above-mentioned lithium ion battery that makes is placed on test respectively cashier's office in a shop, charges with constant voltage charging method, the restriction electric current is 1C (350mA), and final voltage is 3.8 volts.After shelving 20 minutes, be discharged to 2.0 volts with the electric current of 0.2C and 5C from 3.8 volts respectively, write down the discharge capacity of battery respectively and calculate 5C and the ratio of discharge capacity during the 0.2C discharge, that is:
C
5C/ C
0.2C: the electric current with 5C is discharged to the discharge capacity of 2.0V and the ratio that is discharged to the discharge capacity of 2.0V with the electric current of 0.2C from 3.8V from 3.8V.
(2) security performance test: battery is carried out the test of stove heat, that is, battery is placed in the baking oven of 150 degree high temperature, record begins to be placed into the time of battery explosion from battery.
Comparative Examples 1-4
The positive active material LiFePO of following Comparative Examples 1-4 explanation lithium rechargeable battery
4Particle diameter and the two-sided surface density of the positive plate battery performance in protection scope of the present invention not.
Below Comparative Examples 1-4, prepare the LP053048 square lithium ion secondary battery according to the step of embodiment 1, that different is positive active material LiFePO
4Particle diameter size and the two-sided surface density of positive plate, specifically as shown in table 1.According to the method for testing described in the embodiment, the performance of battery to be tested, test result sees Table 1.
Comparative Examples 5
Step according to embodiment 1 prepares the LP053048 square lithium ion secondary battery, and different is that the positive electrode active material material is LiCoO
2Specifically as shown in table 1.According to the method for testing described in the embodiment, the performance of battery to be tested, test result sees Table 1.
Comparative Examples 6
Step according to embodiment 1 prepares the LP053048 square lithium ion secondary battery, and different is that the positive electrode active material material is LiNiO
2Specifically as shown in table 1.According to the method for testing described in the embodiment, the performance of battery to be tested, test result sees Table 1.
From the data of table 1 as can be seen, embodiments of the invention 1-6 compares with Comparative Examples 1-4, though security performance is all fine, the embodiments of the invention 1-6 not only capacity of the 0.2C of battery and 5C is very high, and the Capacity Ratio of 5C/0.2C is also very high simultaneously.
It can also be seen that from the data of table 1 Comparative Examples 5 and 6 adopts LiCoO
2And LiNiO
2As the positive active material of lithium ion battery, though the Capacity Ratio of the capacity of 0.2C and 5C and 5C/0.2C is very high, security performance was relatively poor under the high temperature of Comparative Examples 5 and 6 battery, produced blast at 6 minutes and 5 minutes.
The data declaration of table 1 adopts the positive plate of lithium rechargeable battery provided by the invention and the battery that is prepared by this positive plate, makes lithium rechargeable battery have high-rate discharge ability, high-energy-density and high power discharge performance.
And, adopt the positive active material of phosphate metal lithium compound of the present invention, can obtain the lithium rechargeable battery of high safety performance.
Table 1
Claims (10)
1. the positive plate of a lithium rechargeable battery, this positive plate contains conducting base and is coated in the positive electrode material layer on this conducting base two sides, described positive electrode material layer contains positive active material and binding agent, described positive active material contains the phosphate metal lithium salts of olivine structural, it is characterized in that the two-sided surface density of described positive electrode material layer is 10 to less than 40 milligrams/centimetre
2, the particle diameter of described phosphate metal lithium salts is the 0.5-5 micron.
2. positive plate according to claim 1, wherein, the two-sided surface density of described positive electrode material layer be the 12-35 milligram/centimetre
2, the particle diameter of described phosphate metal lithium salts is the 0.5-4 micron.
3. positive plate according to claim 1, wherein, described phosphate metal lithium salts has following molecular formula: LiMPO
4,
Wherein, M is selected from Fe, Mn, Co or Ni.
4. positive plate according to claim 1 wherein, is a benchmark with the weight of positive active material, and the content of binding agent is 0.01-8 weight %.
5. according to claim 1 or 4 described positive plates, wherein, binding agent is selected from fluorine resin and/or polyolefin compound.
6. positive plate according to claim 5, wherein, described binding agent is selected from one or more in polyvinylidene fluoride, polytetrafluoroethylene or the butadiene-styrene rubber.
7. positive plate according to claim 1, wherein, described conducting base is aluminium foil, Copper Foil or Punching steel strip.
8. positive plate according to claim 1, wherein, described anode active material layer also contains the conductive agent of the 0-15 weight % of positive active material weight.
9. positive plate according to claim 8, wherein, described conductive agent is one or more in acetylene black, conductive carbon black and the electrically conductive graphite.
10. lithium rechargeable battery, this lithium rechargeable battery comprises battery container, electrode group and electrolyte, electrode group and electrolyte are sealed in the battery container, the electrode group comprises reels or stacked positive plate, barrier film and negative plate successively, it is characterized in that described positive plate is any described positive plate among the claim 1-9.
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|---|---|---|---|
| CNA2006101611629A CN101197436A (en) | 2006-12-07 | 2006-12-07 | Positive plate of lithium ion secondary battery, and battery including the same |
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|---|---|---|---|
| CNA2006101611629A CN101197436A (en) | 2006-12-07 | 2006-12-07 | Positive plate of lithium ion secondary battery, and battery including the same |
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| CN107394116A (en) * | 2017-06-19 | 2017-11-24 | 深圳拓邦股份有限公司 | One kind has high rate capability lithium ion battery and preparation method thereof |
| CN109638212A (en) * | 2018-11-20 | 2019-04-16 | 东莞锂威能源科技有限公司 | A kind of high magnification fast charge lithium ion battery |
| CN113728480A (en) * | 2019-04-25 | 2021-11-30 | 雷诺股份公司 | Method for forming Li-ion battery cell |
| CN112018428A (en) * | 2020-08-27 | 2020-12-01 | 湖北亿纬动力有限公司 | Lithium ion battery and preparation method and application thereof |
| CN114388732A (en) * | 2021-12-22 | 2022-04-22 | 东莞新能安科技有限公司 | Electrochemical device and electronic device |
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