CN101924240A - Lithium ion battery - Google Patents
Lithium ion battery Download PDFInfo
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- CN101924240A CN101924240A CN2010102433767A CN201010243376A CN101924240A CN 101924240 A CN101924240 A CN 101924240A CN 2010102433767 A CN2010102433767 A CN 2010102433767A CN 201010243376 A CN201010243376 A CN 201010243376A CN 101924240 A CN101924240 A CN 101924240A
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- lithium ion
- ion battery
- negative
- ethylene carbonate
- electrolyte
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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 discloses a lithium ion battery, which comprises a positive plate, a negative plate, a separator film between the positive plate and the negative plate and electrolyte, wherein the positive plate comprises a positive current collector and a positive diaphragm that is attached to the positive current collector and contains positive active substances, the negative plate comprises a negative current collector and a negative diaphragm that is attached to the negative current collector and contains negative active substances, namely graphite, and the electrolyte contains dimethyl methyl phosphate and halogenated ethylene carbonate. In the lithium ion battery, the halogenated ethylene carbonate can be used as an film-forming additive of the electrolyte, and a stable solid electrolyte interfacial film is formed on the negative surface through reduction, which can prevent the dimethyl methyl phosphate from damaging the interlayer structure of the graphite; and the initial charge-discharge efficiency and volume of the lithium ion battery are improved.
Description
Technical field
The present invention relates to a kind of lithium ion battery, especially a kind of lithium ion battery with good safety energy and chemical property.
Background technology
Along with science and technology development, the lithium ion battery with advantages such as energy density height, reliability height and processability are good is more and more favored, and is widely used in all kinds of portable electric appts.But, when lithium ion battery uses easily because of short circuit, overcharge, high temperature or other improper uses etc. cause that battery temperature raises, even on fire and blast, so the design safety lithium ion battery has just become the task of top priority.
In order to improve the security performance of lithium ion battery, prior art has proposed the multiple technologies scheme, in in No. 200710052150.7, No. 200710052153.0, the Chinese invention patent application CN of on May 11st, 2007 application and the Chinese invention patent application CN that applied on May 10th, 2007, used the fire retardant methyl-phosphoric acid dimethyl ester respectively, it has been added in the electrolyte in varing proportions.Empirical tests, methyl-phosphoric acid dimethyl ester are a kind of good fire retardant really, can be used as all or part of solvent composition of lithium ion battery, with effective security performance of improving lithium ion battery.
But, there is following defective at least in above-mentioned existing lithium ion battery: when methyl-phosphoric acid dimethyl ester is applied in the system that negative pole is a graphite, understand when changing into and graphite generation reduction reaction, cause that graphite is peeled off, the efficient first of lithium ion battery and capacitance loss be very big, influenced the security performance and the chemical property of lithium ion battery.
In view of this, necessary provide a kind of have good safety can and the lithium ion battery of chemical property.
Summary of the invention
The objective of the invention is to: a kind of lithium ion battery with good safety energy and chemical property is provided.
In order to realize the foregoing invention purpose, the invention provides a kind of lithium ion battery, it comprises: positive plate, negative plate, be interval in the barrier film between positive plate and the negative plate, and electrolyte, wherein, positive plate comprises plus plate current-collecting body and attached to the anodal diaphragm that contains positive active material on the plus plate current-collecting body, negative plate comprises negative current collector and attached to the cathode membrane that contains negative electrode active material graphite on the negative current collector, contains methyl-phosphoric acid dimethyl ester and halogenated ethylene carbonate in the electrolyte.
With respect to prior art, lithium ion battery of the present invention has following useful technique effect: halogenated ethylene carbonate can be used as the film for additive of electrolyte, form stable solid electrolyte interface film in negative terminal surface, stop methyl-phosphoric acid dimethyl ester and graphite generation reduction reaction, prevent that graphite layers is destructurized, improve the efficient first and the capacity of lithium ion battery.
As a kind of improvement of lithium ion battery of the present invention, the solvent of described electrolyte all is a methyl-phosphoric acid dimethyl ester, and wherein, the weight percentage of methyl-phosphoric acid dimethyl ester is 1%～100%, and the weight percentage of halogenated ethylene carbonate is 0.1%～30%.
A kind of improvement as lithium ion battery of the present invention, the solvent of described electrolyte is the mixture of methyl-phosphoric acid dimethyl ester and cyclic ester or chain ester, wherein, the weight percentage of methyl-phosphoric acid dimethyl ester is 1%～100%, and the weight percentage of halogenated ethylene carbonate is 0.1%～30%.
As a kind of improvement of lithium ion battery of the present invention, described cyclic ester or chain ester are selected from ethylene carbonate, propene carbonate, methyl ethyl carbonate, dimethyl carbonate, diethyl carbonate, carbonic acid first propyl ester or its combination.
As a kind of improvement of lithium ion battery of the present invention, described halogenated ethylene carbonate is selected from fluorinated ethylene carbonate, chlorocarbonic acid vinyl acetate, bromo ethylene carbonate or its combination.
As a kind of improvement of lithium ion battery of the present invention, described positive active material is selected from cobalt acid lithium, LiMn2O4, LiFePO4, lithium nickel cobalt manganese or its combination.
As a kind of improvement of lithium ion battery of the present invention, described barrier film is three layers of barrier film of polypropylene, polyethylene/polypropylene, or polyethylene individual layer barrier film, or polypropylene individual layer barrier film.
As a kind of improvement of lithium ion battery of the present invention, the lithium salts in the described electrolyte is a lithium hexafluoro phosphate.
Description of drawings
Below in conjunction with specification drawings and specific embodiments, lithium ion battery of the present invention and useful technique effect thereof are elaborated, wherein:
Figure 1 shows that the first charge-discharge curve contrast of comparative example lithium ion battery and embodiment of the invention lithium ion battery.
Embodiment
Adopt methyl-phosphoric acid dimethyl ester (DMMP) to have good electrochemical as the lithium ion battery of fire retardant in order to make, the present invention uses halogenated ethylene carbonate as film for additive.Halogenated ethylene carbonate can and form stable solid electrolyte interface film (SEI) in graphite surface generation reduction reaction, stops methyl-phosphoric acid dimethyl ester to the graphite layers structural damage, improves the chemical property of lithium ion battery.
The electrolyte solvent of lithium ion battery of the present invention can all be a methyl-phosphoric acid dimethyl ester, or the mixture of methyl-phosphoric acid dimethyl ester and cyclic ester or chain ester, and wherein, the weight percentage of methyl-phosphoric acid dimethyl ester is 1%～100%.Halogenated ethylene carbonate can be selected from fluorinated ethylene carbonate (FEC), chlorocarbonic acid vinyl acetate (C1EC), bromo ethylene carbonate (BrEC) or its combination, and wherein, the weight percentage of halogenated ethylene carbonate is 0.1%～30%.Cyclic ester or chain ester can be selected from ethylene carbonate, propene carbonate, methyl ethyl carbonate, dimethyl carbonate, diethyl carbonate, carbonic acid first propyl ester or its combination.
In the lithium ion battery of the present invention, positive active material is selected from cobalt acid lithium, LiMn2O4, LiFePO4, lithium nickel cobalt manganese or its combination; Barrier film is three layers of barrier film of polypropylene, polyethylene/polypropylene, or polyethylene individual layer barrier film, or polypropylene individual layer barrier film; Lithium salts is lithium hexafluoro phosphate (LiPF
6).
Describe lithium ion battery of the present invention in detail below in conjunction with comparative example and embodiment, but embodiments of the invention are not limited thereto.
Comparative example
The making of negative plate: with graphite is negative electrode active material, and it accounts for 90% of cathode membrane weight; With butadiene-styrene rubber (SBR) is binding agent, and it accounts for 5% of cathode membrane weight; With carbon dust (Super-p) is conductive agent, and it accounts for 5% of cathode membrane weight.With above-mentioned powder mixing and stirring in deionized water, make cathode size.Cathode size is uniformly coated on the negative current collector Copper Foil that thickness is 22 μ m, obtains the negative plate that surface attachment has cathode membrane.
The making of positive plate: with the gram volume is the lithium nickel cobalt manganese (LiNi of 148mAh/g
(1/3)Co
(1/3)Mn
(1/3)) be positive active material, it accounts for 94% of anodal diaphragm weight; With polyvinylidene fluoride (PVDF) is binding agent, and it accounts for 2% of anodal diaphragm weight; (Super-p and KS-6) is conductive agent with conductive carbon, and Super-p and KS-6 respectively account for 2% of anodal diaphragm weight.With above-mentioned powder mixing and stirring in N-methyl pyrrolidone (NMP), make anode sizing agent.Anode sizing agent is uniformly coated on the plus plate current-collecting body aluminium foil that thickness is 22 μ m, obtains the positive plate that surface attachment has anodal diaphragm.
The making of barrier film: adopt three layers of barrier film of polypropylene, polyethylene/polypropylene (PP/PE/PP), thickness is 20 μ m.
The making of electrolyte: electrolyte is the lithium hexafluoro phosphate (LiPF of 1.2mol/L with concentration
6) be lithium salts; Mixture with ethylene carbonate (EC), methyl ethyl carbonate (EMC) and dimethyl carbonate (DMC) is a solvent, and the weight ratio of EC, EMC and DMC is EC: EMC: DMC=5: 2: 3; In addition, adding weight percentage in electrolyte is 10% methyl-phosphoric acid dimethyl ester (DMMP).
The making of lithium ion battery: will superpose successively according to positive plate, barrier film and the negative plate that above-mentioned operation makes, make core of lithium ion cell by lamination or winding process; Then, pack into core of lithium ion cell in the lithium ion battery pack case and inject electrolyte, make the comparative example lithium ion battery through operation such as changing into.
Embodiment
The making of negative plate: with graphite is negative electrode active material, and it accounts for 90% of cathode membrane weight; With butadiene-styrene rubber (SBR) is binding agent, and it accounts for 5% of cathode membrane weight; With carbon dust (Super-p) is conductive agent, and it accounts for 5% of cathode membrane weight.With above-mentioned powder mixing and stirring in deionized water, make cathode size.Cathode size is uniformly coated on the negative current collector Copper Foil that thickness is 22 μ m, obtains the negative plate that surface attachment has cathode membrane.
The making of positive plate: with the gram volume is the lithium nickel cobalt manganese (LiNi of 148mAh/g
(1/3)Co
(1/3)Mn
(1/3)) be positive active material, it accounts for 94% of anodal diaphragm weight; With polyvinylidene fluoride (PVDF) is binding agent, and it accounts for 2% of anodal diaphragm weight; (Super-p and KS-6) is conductive agent with conductive carbon, and Super-p and KS-6 respectively account for 2% of anodal diaphragm weight.With above-mentioned powder mixing and stirring in N-methyl pyrrolidone (NMP), make anode sizing agent.Anode sizing agent is uniformly coated on the plus plate current-collecting body aluminium foil that thickness is 22 μ m, obtains the positive plate that surface attachment has anodal diaphragm.
The making of barrier film: adopt three layers of barrier film of polypropylene, polyethylene/polypropylene (PP/PE/PP), thickness is 20 μ m.
The making of electrolyte: electrolyte is the lithium hexafluoro phosphate (LiPF of 1.2mol/L with concentration
6) be lithium salts; Mixture with ethylene carbonate (EC), methyl ethyl carbonate (EMC) and dimethyl carbonate (DMC) is a solvent, and the weight ratio of EC, EMC and DMC is EC: EMC: DMC=5: 2: 3; In addition, adding weight percentage in electrolyte is that 10% methyl-phosphoric acid dimethyl ester (DMMP) and weight percentage are 5% fluorinated ethylene carbonate (FEC).
The making of lithium ion battery: will superpose successively according to positive plate, barrier film and the negative plate that above-mentioned operation makes, make core of lithium ion cell by lamination or winding process; Then, pack into core of lithium ion cell in the lithium ion battery pack case and inject electrolyte, make embodiment of the invention lithium ion battery through operation such as changing into.
Figure 1 shows that the first charge-discharge curve contrast of comparative example lithium ion battery and embodiment of the invention lithium ion battery, as can be seen from the figure: add the efficient first and the capacity that have improved lithium ion battery behind the fluorinated ethylene carbonate (FEC) in the electrolyte.
Need to prove that according to other embodiments of the invention, the positive active material of anodal diaphragm also can be selected from cobalt acid lithium, LiMn2O4, LiFePO4, or the combination of lithium nickel cobalt manganese, cobalt acid lithium, LiMn2O4, LiFePO4; Cyclic ester or chain ester can be selected from ethylene carbonate, propene carbonate, methyl ethyl carbonate, dimethyl carbonate, diethyl carbonate, carbonic acid first propyl ester or its combination; Halogenated ethylene carbonate can be selected from fluorinated ethylene carbonate, chlorocarbonic acid vinyl acetate, bromo ethylene carbonate or its combination; Barrier film also can be polyethylene individual layer barrier film or polypropylene individual layer barrier film.
The announcement of book and instruction according to the above description, the technical staff of the technical field of the invention can also carry out suitable change and modification to above-mentioned execution mode.Therefore, the embodiment that discloses and describe above the present invention is not limited to also should fall in the protection range of claim of the present invention modifications and changes more of the present invention.In addition, although used some specific terms in this specification, these terms do not constitute any restriction to the present invention just for convenience of description.
Claims (8)
1. lithium ion battery, it comprises: positive plate, negative plate, be interval in the barrier film between positive plate and the negative plate, and electrolyte, wherein, positive plate comprises plus plate current-collecting body and attached to the anodal diaphragm that contains positive active material on the plus plate current-collecting body, negative plate comprises negative current collector and attached to the cathode membrane that contains negative electrode active material graphite on the negative current collector, it is characterized in that: contain methyl-phosphoric acid dimethyl ester and halogenated ethylene carbonate in the described electrolyte.
2. lithium ion battery according to claim 1, it is characterized in that: the solvent of described electrolyte all is a methyl-phosphoric acid dimethyl ester, wherein, the weight percentage of methyl-phosphoric acid dimethyl ester is 1%～100%, and the weight percentage scope of halogenated ethylene carbonate is 0.1%～30%.
3. lithium ion battery according to claim 1, it is characterized in that: the solvent of described electrolyte is the mixture of methyl-phosphoric acid dimethyl ester and cyclic ester or chain ester, wherein, the weight percentage of methyl-phosphoric acid dimethyl ester is 1%～100%, and the weight percentage of halogenated ethylene carbonate is 0.1%～30%.
4. lithium ion battery according to claim 3 is characterized in that: described cyclic ester or chain ester are selected from ethylene carbonate, propene carbonate, methyl ethyl carbonate, dimethyl carbonate, diethyl carbonate, carbonic acid first propyl ester or its combination.
5. according to each described lithium ion battery in the claim 1 to 4, it is characterized in that: described halogenated ethylene carbonate is selected from fluorinated ethylene carbonate, chlorocarbonic acid vinyl acetate, bromo ethylene carbonate or its combination.
6. lithium ion battery according to claim 1 is characterized in that: described positive active material is selected from cobalt acid lithium, LiMn2O4, LiFePO4, lithium nickel cobalt manganese or its combination.
7. lithium ion battery according to claim 1 is characterized in that: described barrier film is three layers of barrier film of polypropylene, polyethylene/polypropylene, or polyethylene individual layer barrier film, or polypropylene individual layer barrier film.
8. lithium ion battery according to claim 1 is characterized in that: the lithium salts in the described electrolyte is a lithium hexafluoro phosphate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102433767A CN101924240A (en) | 2010-07-29 | 2010-07-29 | Lithium ion battery |
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|---|---|---|---|
| CN2010102433767A CN101924240A (en) | 2010-07-29 | 2010-07-29 | Lithium ion battery |
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| CN101924240A true CN101924240A (en) | 2010-12-22 |
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ID=43338993
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105449199A (en) * | 2016-01-25 | 2016-03-30 | 东莞市金源电池科技有限公司 | Fast-charging polymer battery |
| CN105655644A (en) * | 2015-12-29 | 2016-06-08 | 东莞新能源科技有限公司 | Lithium ion battery and preparation method thereof |
| CN114497729A (en) * | 2020-11-12 | 2022-05-13 | 山东海科新源材料科技股份有限公司 | Lithium ion battery and electrolyte for lithium ion battery |
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2010
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Patent Citations (8)
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| CN101079505A (en) * | 2007-05-11 | 2007-11-28 | 武汉大学 | Combustion-resisting electrolyte of lithium secondary cell and its lithium cell |
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| CN101771167A (en) * | 2010-02-05 | 2010-07-07 | 九江天赐高新材料有限公司 | High-capacity lithium-ion electrolyte, battery and preparation method of battery |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105655644A (en) * | 2015-12-29 | 2016-06-08 | 东莞新能源科技有限公司 | Lithium ion battery and preparation method thereof |
| CN105449199A (en) * | 2016-01-25 | 2016-03-30 | 东莞市金源电池科技有限公司 | Fast-charging polymer battery |
| CN114497729A (en) * | 2020-11-12 | 2022-05-13 | 山东海科新源材料科技股份有限公司 | Lithium ion battery and electrolyte for lithium ion battery |
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Application publication date: 20101222 |