CN102340027A - Lithium ion battery with high energy density - Google Patents
Lithium ion battery with high energy density Download PDFInfo
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- CN102340027A CN102340027A CN2011102825999A CN201110282599A CN102340027A CN 102340027 A CN102340027 A CN 102340027A CN 2011102825999 A CN2011102825999 A CN 2011102825999A CN 201110282599 A CN201110282599 A CN 201110282599A CN 102340027 A CN102340027 A CN 102340027A
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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
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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 invention discloses a lithium ion battery with high energy density and high power. The lithium ion battery comprises a battery shell, a wound core arranged in the battery shell and electrolyte filled in the battery shell and in and around the wound core. The wound core comprises a positive plate, a negative plate and a diaphragm attached between the positive and negative plates. The positive plate comprises a cathode material layer. The cathode material layer comprises the following components in percentage by weight: 91 to 95 percent of cathode active substance, 2 to 4 percent of conductive agent, 0.5 to 1.5 percent of dispersant and 2.5 to 3.5 percent of adhesive, wherein the conductive agent is a carbon nanofiber or/and a mixture of nano conductive carbon powder and super conductive carbon black; and the dispersant is FS-CM. The lithium ion battery with the high energy density has high high-rate discharge performance, long service life and the high energy density.
Description
Technical field
The invention belongs to technical field of lithium ion, the concrete lithium ion battery that relates to a kind of high-energy-density.
Background technology
Lithium ion battery particularly 18650 type lithium ion batteries is that versatility is the strongest up to now, a lithium ion battery that shipment amount is maximum.Global annual shipment amount is more than 1,500,000,000, and application is very wide.Along with European Union's more and more countries begins to pay close attention to more environmental protection; Numerous traditional products must adapt to the variation of international market and make the transition; A large amount of garden instrument huge market demands of using nickel-cadmium cell increase rapidly, and the ion battery demand is increased rapidly; Increasingly high to the lithium ion battery performance requirement simultaneously, long circulation life, high-energy-density, big current cycle flash-over characteristic require very outstanding.Keeping under the prerequisite of high-energy-density, improving the big current cycle performance of lithium ion battery is the main difficult technical that faces.18650 capacity of lithium ion battery that can accomplish the above heavy-current discharge of 5C now are all below 1500mAh; The battery maximum of 18650～2200mAh of high capacity type can only the 1C charge and discharge cycles; And now no matter be garden instrument or battery-operated motor cycle; All requirement can realize quick charge, and this lithium ion battery to the heavy-current discharge of conventional capacity type battery and low capacity has all proposed new requirement.In addition; The conductive agent electric conductivity is not strong in the slurry of existing lithium ion cell electrode pole piece, and consumption is more, thereby has caused the component such as conductive agent and the proportion of rich lithium compound (the for example sour lithium of cobalt) to differ greatly; Be difficult to form the stabilized uniform slurry; Cause slurry coating difficulty, and cause pole piece to be prone to bad phenomenon such as falling to expect, peel off, come off, directly caused pole piece high rate performance and stable circulation performance poor.Therefore, must be to existing lithium ion battery, the charge-discharge magnification performance that reaches the lithium ion battery of 480WH/L (like 2.2Ah 18650) like energy density is done big improvement.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art, a kind of lithium ion battery with good heavy-current discharge performance, long service life, high-energy-density is provided.
In order to realize the foregoing invention purpose, the technical scheme of the embodiment of the invention is following:
A kind of lithium ion battery of high-energy-density; Comprise battery container, be arranged on the volume core in the said battery container and be filled in the battery container, volume in-core portion and around electrolyte; Said volume core comprises positive plate, negative plate and the barrier film between positive plate and negative plate of being sticked; Said positive plate comprises positive electrode material layer, and said positive electrode material layer comprises the recipe ingredient of following percentage by weight:
Wherein, conductive agent is that carbon nano-fiber is or/and the mixture of conductive nano carbon dust and superconduction carbon black; Said dispersant is FS-CM.
Above-mentioned lithium ion battery has good heavy-current discharge performance, long service life, energy density height.Conductive agent has improved the positive plate electric conductivity significantly in the prescription of this positive electrode material layer; Save the consumption of conductive agent, reduced production cost, components such as effectively dispersed electro-conductive agent of dispersant, positive active material; The anode sizing agent each component that makes each set of dispense process is uniformly dispersed; Stability of slurry is high, and the positive plate dressing that feasible coating back obtains is even, and the absorbency of electrode is good with guarantor's fluidity; Effectively overcome the deficiency that is prone to material, peels off, comes off like existing positive plate, improved the high rate performance and the stable circulation performance of battery.
Description of drawings
Fig. 1 is lithium ion battery discharge curve under different multiplying of the embodiment of the invention 1 preparation.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention provides a kind of lithium ion battery with good heavy-current discharge performance, long service life, high-energy-density.The lithium ion battery of this high-energy-density comprises battery container, be arranged on the volume core in the battery container and be filled in the battery container, volume in-core portion and around electrolyte; This volume core comprises positive plate, negative plate and the barrier film between positive plate and negative plate of being sticked; This positive plate comprises positive electrode material layer, and said positive electrode material layer comprises the recipe ingredient of following percentage by weight:
Wherein, conductive agent is that carbon nano-fiber is or/and the mixture of conductive nano carbon dust and superconduction carbon black (Super P); Said dispersant is FS-CM.
Above-mentioned lithium ion battery has good heavy-current discharge performance, long service life, energy density height.Conductive agent has improved the positive plate electric conductivity significantly in the prescription of this positive electrode material layer, when being carbon nano-fiber and conductive nano toner mixture when conductive agent, the absorbency that the superconduction carbon black can overcome carbon nano-fiber with protect the fluidity defect of bad; And the consumption of saving conductive agent; Reduced production cost, components such as effectively dispersed electro-conductive agent of dispersant, positive active material, the anode sizing agent each component that makes each set of dispense process is uniformly dispersed; Stability of slurry is high; The positive plate dressing that feasible coating back obtains is even, and the absorbency of electrode is good with guarantor's fluidity, has effectively overcome the deficiency that is prone to material, peels off, comes off like existing positive plate; The high rate performance and the stable circulation performance of battery have been improved
Preferably, above-mentioned dispersant preferred content is 0.5wt%; Positive active material is LiCo
0.2Ni
0.75Al
0.05O
2Mixture or LiCo with LiMn2O4
0.2Ni
0.5Mn
0.3O
2Ternary material; Bonding agent is at least a in polyvinylidene fluoride (PVDF), the polytetrafluoroethylene; The positive active material of optimization formula and bonding agent can form with conductive agent, dispersant and be uniformly dispersed, stable anode sizing agent; The existing anode sizing agent each component proportion that has effectively overcome described in background technology differs bigger; Disperse inequality, the deficiency of poor stability.Wherein, preferred positive active material capacity is high, effectively improves the energy density of embodiment of the invention lithium ion battery.
The compound method of above-mentioned positive electrode material layer slurry is following: earlier conductive agent, dispersant and solvent NMP high-speed stirred, conductive agent is uniformly dispersed, and also subsequent use as conduction.Add the nmp solution of pre-configured PVDF then according to the binding agent ratio, add positive active material again, mix and get final product.This positive electrode material layer slurry that configures is coated on the positive plate body, obtains positive plate through drying.The two-sided surface density control of the dressing of this positive plate is preferably at 400g/m
2, thickness of electrode is less than 140 μ m,
Preferably; Negative plate contains negative material; Said negative material is a kind of in Delanium, the hard carbon material; Perhaps be the mixture of Delanium and silicon-carbon Si-C, tin carbon Sn-C, Graphene, when negative material was the mixture of Delanium and silicon-carbon Si-C, tin carbon Sn-C, Graphene, the mixture three's of Delanium and silicon-carbon Si-C, tin carbon Sn-C, Graphene mass ratio was preferably 8: 2～5: 5 ratio.Electrolyte comprises hexafluorophosphoric acid lithium electrolyte and polynary organic solvent; The concentration of electrolyte lithium hexafluoro phosphate is 1.2～1.5mol/L; Polynary organic solvent is two or three mixture in fluorinated ethylene carbonate, dimethyl carbonate, methyl ethyl carbonate, the divinyl carbonate, and each component ratio does not have special demands in the polynary organic solvent of this mixture.This preferred negative material and electrolyte make that embodiment of the invention lithium ion battery cycle life is longer, and energy density is higher.
Further preferably, above-mentioned electrolyte also comprises 1～3% vinylene carbonate (VC), 1～2% biphenyl (BP) and 0.5～2% additives such as fluorobenzene methyl ether.VC plays good film-formation result at the battery initial stage of changing into, and lets the cycle performance of battery improve, and the fluorobenzene methyl ether can let the fail safe of battery be improved.
Preferably, above-mentioned barrier film is individual layer PE barrier film or three layers of barrier film of PP-PE-PP.Particularly, this membrane thicknesses is preferably 20～25 μ m, and porosity is preferably 50～58%.
In addition, in the lithium ion battery of above-mentioned embodiment of the invention high-energy-density, pole piece forms the volume core through reeling, place in the battery container, seals with block behind the injection electrolyte.Can select nickel plating box hat or Stainless Steel Shell for use in this battery container.The lithium ion battery preferred for preparation of embodiment of the invention high-energy-density becomes 18650 cylindrical lithium ion batteries.
Existing lithium ion battery with concrete high-energy-density is an example, and the present invention is further elaborated.
Embodiment 1
A kind of lithium ion battery of high-energy-density; Comprise battery container, be arranged on the volume core in the battery container and be filled in the battery container, volume in-core portion and around electrolyte, this volume core comprises positive plate, negative plate and the barrier film between positive plate and negative plate of being sticked.Wherein, positive plate comprises positive electrode material layer, and positive electrode material layer comprises the recipe ingredient of following percentage: LiCo
0.2Ni
0.5Mn
0.3O
2Ternary material 95wt%, carbon nano-fiber 0.5wt%, superconduction carbon black Super P 1.5wt%, FS-CM 0.5wt%, PVDF bonding agent 2.5wt%; Negative material is a Delanium; Barrier film is the individual layer PE of 25 μ m thickness, 55% porosity; Electrolyte comprises hexafluorophosphoric acid lithium electrolyte, polynary organic solvent and additive; Wherein, The concentration of electrolyte lithium hexafluoro phosphate is 1.3mol/L, and polynary organic solvent is 2: 1 fluorinated ethylene carbonate of volume ratio, two kinds of mixtures of dimethyl carbonate, and additive is 2% vinylene carbonate; 1.5% biphenyl, 1% fluorobenzene methyl ether.
According to the method for present embodiment 1, prepare 18650 lithium ion battery samples of four high-energy-densities, and 18650 lithium ion battery samples of these four high-energy-densities are carried out the different multiplying discharge test.See the following form 1 through test data, its discharge curve is seen shown in Figure 1.Wherein, the charging in test process ends from 0.5C to 4.2v, 0.03C, and discharge is discharged to 2.75v and ends under different multiplying; Curve 1 among Fig. 1, curve 2, curve 3, curve 4, curve 5, curve 6, curve 7 are represented 18650 lithium ion batteries discharge curve under 1C, 2C, 3C, 4C, 5C, 6C, 7C multiplying power respectively.Can learn that by table 1, Fig. 1 the energy density of 18650 batteries has reached 450WH/L, the continuous discharge power density reaches 2500W/L.
Table 1
Embodiment 2
A kind of lithium ion battery of high-energy-density, its structure is identical with embodiment 1, and present embodiment 2 is that with the difference of embodiment 1 positive electrode material layer comprises the recipe ingredient of following percentage: weight ratio is 1: 1 LiCo
0.2Ni
0.75Al
0.05O
2Mixture 91%, conductive nano carbon dust 1%, superconduction carbon black Super P 3%FS-CM1.5%, PVDF3.5% with LiMn2O4; Negative material is a hard carbon material; Barrier film is three layers of the PP-PE-PP of 20 μ m thickness, 50% porosity; Electrolyte comprises hexafluorophosphoric acid lithium electrolyte, polynary organic solvent and additive; Wherein, The concentration of electrolyte lithium hexafluoro phosphate is 1.5mol/L, and polynary organic solvent is 2: 1 fluorinated ethylene carbonate of volume ratio, two kinds of mixtures of dimethyl carbonate, and additive is 3% vinylene carbonate; 1% biphenyl, 2% fluorobenzene methyl ether.
A kind of lithium ion battery of high-energy-density, its structure is identical with embodiment 1, and present embodiment 3 is that with the difference of embodiment 1 positive electrode material layer comprises the recipe ingredient of following percentage: weight ratio is 1: 1 LiCo
0.2Ni
0.75Al
0.05O
2Mixture 93%, conductive nano carbon dust 1%, superconduction carbon black Super P 1.5%FS-CM 1%, polytetrafluoroethylene 3.5% with LiMn2O4; Negative material is Delanium and 8: 2 silicon-carbon Si-C mixture of mass ratio; Barrier film is three layers of the PP-PE-PP of 22 μ m thickness, 58% porosity; Electrolyte comprises hexafluorophosphoric acid lithium electrolyte, polynary organic solvent and additive, and wherein, the concentration of electrolyte lithium hexafluoro phosphate is 1.2mol/L, and polynary organic solvent is 1: 1 dimethyl carbonate of volume ratio and methyl ethyl carbonate ester admixture.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the lithium ion battery of a high-energy-density; Comprise battery container, be arranged on the volume core in the said battery container and be filled in the battery container, volume in-core portion and around electrolyte; Said volume core comprises positive plate, negative plate and the barrier film between positive plate and negative plate of being sticked; It is characterized in that: said positive plate comprises positive electrode material layer, and said positive electrode material layer comprises the recipe ingredient of following percentage by weight:
Wherein, conductive agent is that carbon nano-fiber is or/and the mixture of conductive nano carbon dust and superconduction carbon black; Said dispersant is FS-CM.
2. the lithium ion battery of high-energy-density as claimed in claim 1 is characterized in that, said positive active material LiCo
xNi
yAl
zO
2With the mixture of LiMn2O4, or LiCo
xNi
yMn
zO
2Ternary material, wherein X+Y+Z=1.
3. the lithium ion battery of high-energy-density as claimed in claim 1 is characterized in that, said bonding agent is a polyvinylidene fluoride.
4. the lithium ion battery of high-energy-density as claimed in claim 1; It is characterized in that; Said negative plate contains negative material, and said negative material is a kind of in Delanium, the hard carbon material, perhaps is the mixture of Delanium and silicon-carbon Si-C, tin carbon Sn-C, Graphene.
5. the lithium ion battery of high-energy-density as claimed in claim 1 is characterized in that, said electrolyte comprises hexafluorophosphoric acid lithium electrolyte and polynary organic solvent, and the concentration of said electrolyte lithium hexafluoro phosphate is 1.2～1.5mol/L.
6. the lithium ion battery of high-energy-density as claimed in claim 1 is characterized in that, said polynary organic solvent is two or three mixture in fluorinated ethylene carbonate, dimethyl carbonate, methyl ethyl carbonate, the divinyl carbonate.
7. the lithium ion battery of high-energy-density as claimed in claim 1 is characterized in that, said electrolyte also comprises 1～3% vinylene carbonate, the biphenyl of 1～2wt% and the fluorobenzene methyl ether of 0.5～2wt%.
8. the lithium ion battery of high-energy-density as claimed in claim 1 is characterized in that, said barrier film is individual layer PE barrier film or three layers of barrier film of PP-PE-PP.
9. like the lithium ion battery of claim 1 or 8 described high-energy-densities, it is characterized in that said membrane thicknesses is 20～25 μ m, porosity is 50～58%.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694201A (en) * | 2012-06-04 | 2012-09-26 | 东莞新能源科技有限公司 | Lithium ion battery |
| CN103208645A (en) * | 2012-12-31 | 2013-07-17 | 深圳宏泰电池科技有限公司 | Nano-power battery composed of lithium manganate and graphene and preparation method thereof |
| CN105308779A (en) * | 2013-06-12 | 2016-02-03 | 赫罗伊斯石英玻璃股份有限两合公司 | Lithium ion battery for secondary battery pack |
| CN105552429A (en) * | 2016-01-29 | 2016-05-04 | 长沙理工大学 | Overcharge-prevention lithium ion battery electrolyte and lithium ion battery |
| CN105895949A (en) * | 2014-10-08 | 2016-08-24 | 江苏海四达电源股份有限公司 | Preparation of cylindrical 2200mAh lithium ion power battery with high capacity and high current discharge |
| CN106450333A (en) * | 2016-10-28 | 2017-02-22 | 合肥国轩电池材料有限公司 | Lithium battery anode slurry and slurry mixing method thereof |
| RU169539U1 (en) * | 2015-04-30 | 2017-03-22 | Александр Сергеевич Логинов | LITHIUM ION BATTERY |
| CN107394197A (en) * | 2017-07-18 | 2017-11-24 | 宁波富理电池材料科技有限公司 | A kind of positive electrode, its preparation method and lithium ion battery |
| CN114447430A (en) * | 2020-10-30 | 2022-05-06 | 深圳新宙邦科技股份有限公司 | Lithium ion battery |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694201A (en) * | 2012-06-04 | 2012-09-26 | 东莞新能源科技有限公司 | Lithium ion battery |
| CN103208645A (en) * | 2012-12-31 | 2013-07-17 | 深圳宏泰电池科技有限公司 | Nano-power battery composed of lithium manganate and graphene and preparation method thereof |
| CN105308779A (en) * | 2013-06-12 | 2016-02-03 | 赫罗伊斯石英玻璃股份有限两合公司 | Lithium ion battery for secondary battery pack |
| CN105308779B (en) * | 2013-06-12 | 2018-06-26 | 赫罗伊斯石英玻璃股份有限两合公司 | Lithium ion battery for secondary battery pack |
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| CN105895949A (en) * | 2014-10-08 | 2016-08-24 | 江苏海四达电源股份有限公司 | Preparation of cylindrical 2200mAh lithium ion power battery with high capacity and high current discharge |
| RU169539U1 (en) * | 2015-04-30 | 2017-03-22 | Александр Сергеевич Логинов | LITHIUM ION BATTERY |
| CN105552429A (en) * | 2016-01-29 | 2016-05-04 | 长沙理工大学 | Overcharge-prevention lithium ion battery electrolyte and lithium ion battery |
| CN106450333A (en) * | 2016-10-28 | 2017-02-22 | 合肥国轩电池材料有限公司 | Lithium battery anode slurry and slurry mixing method thereof |
| CN107394197A (en) * | 2017-07-18 | 2017-11-24 | 宁波富理电池材料科技有限公司 | A kind of positive electrode, its preparation method and lithium ion battery |
| CN107394197B (en) * | 2017-07-18 | 2021-05-25 | 宁波富理电池材料科技有限公司 | Cathode material, preparation method thereof and lithium ion battery |
| CN114447430A (en) * | 2020-10-30 | 2022-05-06 | 深圳新宙邦科技股份有限公司 | Lithium ion battery |
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