CN104638293A - High-compaction-density cathode lithium ion battery and electrolyte - Google Patents

High-compaction-density cathode lithium ion battery and electrolyte Download PDF

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CN104638293A
CN104638293A CN201510037119.0A CN201510037119A CN104638293A CN 104638293 A CN104638293 A CN 104638293A CN 201510037119 A CN201510037119 A CN 201510037119A CN 104638293 A CN104638293 A CN 104638293A
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electrolyte
lithium ion
ion battery
total weight
ethylene carbonate
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石桥
林木崇
张海玲
周笛雄
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Shenzhen Capchem Technology Co Ltd
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Shenzhen Capchem Technology Co Ltd
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Priority to PCT/CN2015/089152 priority patent/WO2016115909A1/en
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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
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • 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
    • H01M10/058—Construction or manufacture
    • 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

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  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a high-compaction-density cathode lithium ion battery and an electrolyte. The high-compaction-density cathode lithium ion battery comprises an anode, a cathode, a diaphragm and the electrolyte, wherein the electrolyte contains alkyl sultone accounting for 1-5% of the total weight of the electrolyte, fluoro-ethylene carbonate accounting for 1-10% of the total weight of the electrolyte and vinyl ethylene carbonate accounting for 0.1-2% of the total weight of the electrolyte; and the compaction density of a pole piece of a cathode is not less than 1.65g/cm<3>. According to the lithium ion battery disclosed by the invention, appropriate amounts of alkyl sultone, fluoro-ethylene carbonate and vinyl ethylene carbonate are added into the electrolyte to ensure that the battery can adopt the cathode with higher compaction density, so that the lithium ion battery has a relatively large volume capacity density. Moreover, the battery disclosed by the invention is easy to infiltrate, can ensure that lithium cannot be separated out, and is long in normal-temperature cycle life and good in high-temperature storage performance, thereby laying a foundation for expanding application of the lithium ion battery.

Description

A kind of high compacted density negative electrode lithium ion battery and electrolyte
Technical field
The application relates to the field of lithium ion battery of high compacted density negative pole, particularly relates to a kind of high compacted density negative electrode lithium ion battery, and the electrolyte adapted to it.
Background technology
In recent years, portable type electronic product, such as camera, Digital Video, mobile phone, notebook computer etc. are widely used in daily life.Reduce size, weight reduction, increasing the service life is development trend and the requirement of electronic product industry.Therefore, develop the power supply product that matches with portable type electronic product, especially develop and the lightweight secondary cell of high-energy-density can be provided to be the active demand of industry development.
Improving compacted density is one of important means improving lithium ion battery negative energy density.But lithium ion battery negative material compacted density is higher, also higher to the requirement of electrolyte.Be applicable to the electrolyte of conventional compaction negative pole in high-pressure solid system, easily occur infiltrating not exclusively, lithium analysed by battery, cycle life declines, degradation series of problems under high rate performance.The method of current raising high-pressure solid electrolyte fluidity energy has two kinds, and one adds low viscous solvent, and as ethyl acetate etc., these solvents can reduce the viscosity of electrolyte, promotes that electrolyte infiltrates, improves the performances such as the circulation ratio of battery; One adds to promote to circulate, fall low-impedance additive, and as FEC etc., these additives can reduce battery impedance, and battery is not easy to analyse lithium, are conducive to the raising of the cycle life of battery.But these two kinds of methods all can reduce battery high-temperature stability, the high-temperature behavior of electrolyte is caused to be deteriorated, easy inflatable etc.So ensure that battery does not analyse lithium, taking into account again high-temperature behavior and the normal temperature circulation of battery, is a large problem of high-pressure solid negative electrode lithium ion battery electrolyte research.
Summary of the invention
The object of the application is to provide a kind of lithium ion battery of high compacted density negative pole and the electrolyte adapted with it.
To achieve these goals, the application have employed following technical scheme:
The one side of the application discloses a kind of lithium ion battery of high compacted density negative pole, comprise positive pole, negative pole, barrier film and electrolyte, wherein, containing the alkyl sultone accounting for electrolyte total weight 1-5% in electrolyte, account for the fluorinated ethylene carbonate of electrolyte total weight 1-10%, account for the vinyl ethylene carbonate of electrolyte total weight 0.1-2%; Further, the pole piece compaction density of negative pole is not less than 1.65g/cm 3.
It should be noted that, the high compacted density negative electrode lithium ion battery of the application, is not less than 1.65g/cm in the pole piece compaction density of negative pole 3when, still can ensure that battery does not analyse lithium, and, possess good battery high-temperature behavior and normal-temperature circulating performance; The important reason of one namely, creationary add in the electrolyte of routine account for electrolyte total weight 1-5% alkyl sultone, account for the fluorinated ethylene carbonate of electrolyte total weight 1-10% and account for the vinyl ethylene carbonate of electrolyte total weight 0.1-2%; Be appreciated that in the battery of the application, other component of such as electrolyte, barrier film, positive pole and negative pole etc., can with reference to the lithium ion battery of routine; As long as add in the electrolytic solution the application limit consumption additive can reach the effect of the application.
Preferably, the pole piece compaction density of negative pole is not less than 1.70g/cm 3.It should be noted that, the lithium ion battery of the application, the pole piece compaction density of its negative pole can reach 1.70g/cm 3above, thus prepare the lithium ion battery of more high-energy-density; Further, in such high compacted density negative pole situation, still can ensure that battery does not analyse lithium, possesses good battery high-temperature behavior and normal-temperature circulating performance.
Preferably, the lithium ion battery of the application, also containing the cycli phosphate acid anhydride accounting for electrolyte total weight 0.1-2% in its electrolyte, described cycli phosphate acid anhydride has structure shown in formula 1;
Wherein R1, R2, R3 are repeatably selected from alkyl, haloalkyl, the alkenyl or alkynyl of H or 1-6 carbon atom respectively.
Preferred, cycli phosphate acid anhydride is structural formula 1, at least one of structural formula 2, compound shown in structural formula 3 and structural formula 4;
Preferably, the lithium ion battery of the application, also containing the fluorobenzene accounting for electrolyte total weight 1-20% in its electrolyte.
Preferably, in order to reach better effect, in the lithium ion battery of the application, the active material of positive pole is cobalt acid lithium, and the active material of described negative pole is graphite.
Preferably, in order to reach better effect, in the lithium ion battery of the application, the organic solvent of electrolyte is the mixed solvent of ethylene carbonate, diethyl carbonate and methyl ethyl carbonate composition, electrolyte is lithium hexafluoro phosphate, further, volume ratio ethylene carbonate: diethyl carbonate: methyl ethyl carbonate=1:1:1.
The another side of the application also discloses a kind of electrolyte adapted with the high compacted density negative electrode lithium ion battery of the application, in this electrolyte, containing the alkyl sultone accounting for electrolyte total weight 1-5%, account for the fluorinated ethylene carbonate of electrolyte total weight 1-10%, account for the vinyl ethylene carbonate of electrolyte total weight 0.1-2%.
It should be noted that, the electrolyte of the application, owing to the addition of the alkyl sultone accounting for electrolyte total weight 1-5%, accounts for the fluorinated ethylene carbonate of electrolyte total weight 1-10%, and accounts for the vinyl ethylene carbonate of electrolyte total weight 0.1-2%; Make it go for the lithium ion battery of more high compacted density negative pole, make the battery prepared can ensure not analyse lithium, and, also possess good battery high-temperature behavior and normal-temperature circulating performance; For the lithium ion battery preparing high-energy-density is laid a good foundation.
Preferably, also containing the cycli phosphate acid anhydride accounting for electrolyte total weight 0.1-2% in electrolyte, cycli phosphate acid anhydride has structure shown in formula 1;
Wherein R1, R2, R3 are repeatably selected from alkyl, haloalkyl, the alkenyl or alkynyl of H or 1-6 carbon atom respectively.
Preferred at least one of adding cycli phosphate acid anhydride shown in structural formula 1, structural formula 2, structural formula 3 and structural formula 4 in the electrolytic solution.
Preferably, in electrolyte also containing the fluorobenzene accounting for electrolyte total weight 1-20%.
Preferably, in order to reach better effect, the electrolyte of the application, its organic solvent is the mixed solvent of ethylene carbonate, diethyl carbonate and methyl ethyl carbonate composition, electrolyte is lithium hexafluoro phosphate, and, ethylene carbonate: diethyl carbonate: methyl ethyl carbonate=1:1:1.
Owing to adopting above technical scheme, the beneficial effect of the application is:
The high compacted density negative electrode lithium ion battery of the application, the alkyl sultone of 1-5% weight portion is with the addition of in its electrolyte, the fluorinated ethylene carbonate of 1-10% weight portion and the vinyl ethylene carbonate of 0.1-2% weight portion, make battery can adopt the negative pole of more high compacted density, thus there is larger volume capacity density.Further, the high compacted density negative electrode lithium ion battery of the application, easily infiltrates, and not only can ensure not analyse lithium, also possess good battery high-temperature behavior and normal-temperature circulating performance; For the expansive approach of lithium ion battery is laid a good foundation.
Embodiment
The final purpose of the application be to provide a kind of and easily infiltrate, do not analyse lithium, normal temperature cycle life is good, high temperature safety is good, the high-pressure solid negative electrode lithium ion battery of high comprehensive performance.And this object will be reached, the electrolyte of lithium ion battery is a key factor.For this reason, the application is creationary with the addition of appropriate alkyl sultone (1 in the electrolyte of lithium ion battery, 3-PS), fluorinated ethylene carbonate (FEC) and vinyl ethylene carbonate (VEC), to improve the performance of electrolyte; Thus prepared negative pole compacted density and be greater than 1.65g/cm 3, even can be greater than 1.70g/cm 3high compacted density negative electrode lithium ion battery, and can ensure that battery does not analyse lithium, and possess good battery high-temperature behavior and normal-temperature circulating performance.The high compacted density negative electrode lithium ion battery of the application not only possesses higher energy density, and the combination property such as high-temperature behavior and normal-temperature circulating performance all increases.
On the basis of the high compacted density negative electrode lithium ion battery of the application, present invention also provides a kind of electrolyte adapted to it, the preferred version of this electrolyte is, be ethylene carbonate at organic solvent, the mixed solvent of diethyl carbonate and methyl ethyl carbonate composition, electrolyte is lithium hexafluoro phosphate, and, ethylene carbonate: diethyl carbonate: on the basis of methyl ethyl carbonate=1:1:1, add the alkyl sultone accounting for electrolyte total weight 1-5%, account for the fluorinated ethylene carbonate of electrolyte total weight 1-10% and account for the vinyl ethylene carbonate of electrolyte total weight 0.1-2%.Wherein, alkyl sultone (1,3-PS), can form stable solid electrolyte interface film at negative pole, i.e. SEI, has obvious effect, improve the fail safe of battery to suppression high temperature inflatable; Fluorinated ethylene carbonate (FEC) can improve the cycle life of battery; Vinyl ethylene carbonate (VEC), can in both positive and negative polarity film forming, and improve the oxidation stability of electrolyte, cathode film formation also can improve high-temperature behavior and the cycle life of battery; Alkyl sultone, fluorinated ethylene carbonate and vinyl ethylene carbonate with the use of, thus make electrolyte can adapt to the lithium ion battery of more high compacted density negative pole.
Preferably, also with the addition of cycli phosphate acid anhydride and fluorobenzene in the electrolytic solution, and stop collar phosphoric anhydride accounts for the 0.1-2% of electrolyte total weight, fluorobenzene accounts for the 1-20% of electrolyte total weight.Wherein, cycli phosphate acid anhydride can improve on the one hand the high-temperature stability of electrolyte, significantly improves the high temperature safety of battery, its content lower than 0.1% time act on not obvious, its content higher than 2% time increase battery cathode impedance, cause battery cathode to analyse lithium.Fluorobenzene can reduce electrolyte viscosity and and pole piece between surface tension, promote to infiltrate, its content lower than 1% time act on not obvious, reduce the high-temperature stability of electrolyte when content is greater than 20%, be unfavorable for the high temperature safety of battery.
Below by specific embodiment, the application is described in further detail.Following examples are only further described the application, should not be construed as the restriction to the application.
Embodiment
The mixed organic solvents that this example adopts vinyl acetate (EC), diethyl carbonate (DEC) and methyl ethyl carbonate (EMC) to form, and lithium hexafluoro phosphate (LiPF 6) based on electrolyte test.In additive, the cycli phosphate acid anhydride that optionally with the addition of structural formula 1-structural formula 4 four kinds of structures is tested.
This example devises 18 test group and 3 control groups altogether, and in test group and control group, the consumption of each additive is as shown in table 1; Except the difference shown in table 1, each test group is identical with other design of control group.Specific as follows:
1) preparation of electrolyte
By ethylene carbonate (EC), diethyl carbonate (DEC) and methyl ethyl carbonate (EMC) in mass ratio for EC:DEC:EMC=1:1:1 mixes, then add lithium hexafluoro phosphate (LiPF 6) be 1mol/L to molar concentration, then add each additive according to table 1.The consumption of additive, according to the percentages of gross mass accounting for electrolyte.
2) preparation of positive plate
By the quality of 93:4:3 lithium sourer than blended anode active material cobalt, then they are dispersed in METHYLPYRROLIDONE (NMP), obtain anode sizing agent by conductive carbon black Super-P and binding agent polyvinylidene fluoride (PVDF).Be uniformly coated on by slurry on the two sides of aluminium foil, through drying, calendering and vacuumize, and burn-on after aluminum lead-out wire with supersonic welder and obtain positive plate, the thickness of pole plate is at 120 ~ 150 μm.
3) preparation of negative plate
By the mass ratio mixing negative active core-shell material modified natural graphite of 94:1:2.5:2.5, conductive carbon black Super-P, binding agent butadiene-styrene rubber (SBR) and carboxymethyl cellulose (CMC), then by their dispersions in deionized water, obtain cathode size.Slurry is coated on the two sides of Copper Foil, through drying, roll-in, and burn-ons after nickel making outlet with supersonic welder and obtain negative plate.Compacted density after each test group and control group roll-in is as shown in table 1.
4) preparation of battery core
Between positive plate and negative plate, place thickness is that the polyethene microporous membrane of 20 μm is as barrier film, then the sandwich structure that positive plate, negative plate and barrier film form is reeled, aluminum plastic film is put into after being flattened by coiling body again, after the lead-out wire of both positive and negative polarity is drawn respectively, hot-press sealed aluminum plastic film, obtains the battery core treating fluid injection.
5) battery core fluid injection and change into
In the glove box that dew point controls below-40 DEG C, the electrolyte of above-mentioned preparation is injected battery core by liquid injection hole, and the amount of electrolyte will ensure the space be full of in battery core.Then change into according to the following steps: 0.05C constant current charge 180min, 0.1C constant current charge 180min, shelves shaping sealing after 24hr, then further with the electric current constant current charge of 0.2C to 4.2V, after normal temperature shelf 24hr, with the electric current constant-current discharge of 0.2C to 3.0V.
6) normal-temperature circulating performance test
At normal temperatures, with the electric current constant current charge of 0.5C to 4.2V then constant voltage charge drop to 0.1C to electric current, then with the electric current constant-current discharge of 0.5C to 3.0V, so circulation 200 weeks, record the discharge capacity of the 1st week and the discharge capacity of the 200th week, be calculated as follows capability retention:
Capability retention=(the discharge capacity ÷ discharge capacity of the 1st week of the 200th week) × 100%
Test result is as shown in table 2.
7) high-temperature storage performance test
At room temperature with the electric current constant current charge of 0.5C to 4.2V then constant voltage charge drop to 0.1C to electric current, measure the thickness of battery, then baking oven battery being placed in constant temperature 85 DEG C stores 4h, take out relief battery cool to room temperature, measure the thickness of battery, be calculated as follows the thickness swelling of battery:
Cell thickness × 100% before thickness swelling=(cell thickness before the cell thickness-storage after storage) ÷ stores
Test result is as shown in table 2.
Each amounts of components of table 1 electrolysis additive and compacted density
Test Compacted density FEC 1,3-PS VEC Cycli phosphate acid anhydride Fluorobenzene
Test group 1 1.70g/cm 3 5％ 3％ 1％ — —
Test group 2 1.70g/cm 3 1％ 3％ 1％ — —
Test group 3 1.70g/cm 3 10％ 3％ 1％ — —
Test group 4 1.70g/cm 3 5％ 1％ 1％ — —
Test group 5 1.70g/cm 3 5％ 5％ 1％ — —
Test group 6 1.70g/cm 3 5％ 3％ 0.1％ — —
Test group 7 1.70g/cm 3 5％ 3％ 2％ — —
Test group 8 1.70g/cm 3 5％ 3％ 1％ Structural formula 1:0.1% —
Test group 9 1.70g/cm 3 5％ 3％ 1％ Structural formula 1:1% —
Test group 10 1.70g/cm 3 5％ 3％ 1％ Structural formula 1:2% —
Test group 11 1.70g/cm 3 5％ 3％ 1％ — 1％
Test group 12 1.70g/cm 3 5％ 3％ 1％ — 10％
Test group 13 1.70g/cm 3 5％ 3％ 1％ — 20％
Test group 14 1.70g/cm 3 5％ 3％ 1％ Structural formula 1:0.5% 5％
Test group 15 1.70g/cm 3 5％ 3％ 1％ Structural formula 2:0.5% 5％
Test group 16 1.70g/cm 3 5％ 3％ 1％ Structural formula 3:0.5% 5％
Test group 17 1.65g/cm 3 5％ 3％ 1％ Structural formula 1:0.5% 5％
Test group 18 1.5g/cm 3 5％ 3％ 1％ Structural formula 1:0.5% 5％
Control group 1 1.70g/cm 3 — — — — —
Control group 2 1.5g/cm 3 — — — — —
Table 2 capability retention and thickness swelling test result
Test Capability retention Thickness swelling
Test group 1 91.08％ 4.32％
Test group 2 85.34％ 1.62％
Test group 3 92.68％ 9.48％
Test group 4 91.65％ 5.08％
Test group 5 90.04％ 3.24％
Test group 6 92.51％ 8.47％
Test group 7 89.87％ 1.82％
Test group 8 91.03％ 4.28％
Test group 9 90.21％ 1.96％
Test group 10 88.61％ 1.27％
Test group 11 91.35％ 4.58％
Test group 12 92.33％ 7.89％
Test group 13 92.89％ 12.16％
Test group 14 91.52％ 2.67％
Test group 15 91.36％ 2.53％
Test group 16 91.48％ 2.19％
Test group 17 91.82％ 2.87％
Test group 18 92.08％ 3.01％
Control group 1 80.36％ 9.35％
Control group 2 91.54％ 13.26％
Can see from control group, on identical electrolyte basis, negative pole compacted density 1.70g/cm 3battery normal-temperature circulating performance obviously not as compacted density 1.50g/cm 3battery, this is because the compacted density of battery is too large, electrolyte easily infiltrates not exclusively, analyses lithium, and cause battery impedance to increase, cycle performance is poor.Can see the electrolyte of the additive adopting the application from test group 14,17,18, its high-pressure solid negative electrode lithium ion battery prepared, along with the increase of negative pole compacted density, battery normal-temperature circulating performance is substantially unchanged.Can see the additive of the application from test group 14,15,16, structural formula 1-structural formula 3 all possesses identical effect.
In addition, the thickness swelling of test group 13 is higher, thinking, is the reason of fluorobenzene large usage quantity, to this, the application conducts in-depth research the consumption of fluorobenzene based on test group 13, result shows, its content lower than 1% time act on not obvious, reduce the high-temperature stability of electrolyte when content is greater than 20%, be unfavorable for the high temperature safety of battery, as test group 11-13.The capability retention of test group 2 is lower relative to other test group, because FEC consumption is relatively little, to the result display that FEC consumption is studied based on this test group, the 1-10% that FEC consumption accounts for total electrolyte weight can meet user demand, about 5% effect is better, when consumption reaches 10%, thickness swelling may be affected, such as test group 3.In addition, the thickness swelling of test group 6 is higher, may be because VEC consumption is on the low side, and based on this to the result display that VEC consumption is tested, the 0.1-2% that VEC consumption accounts for total electrolyte weight can meet user demand.The 1-5% that the consumption of alkyl sultone accounts for electrolyte total weight can reach good effect, as test group 4 and test group 5.The 0.1-2% that the consumption of cycli phosphate acid anhydride accounts for electrolyte total weight can reach good effect, as test group 8,9 and 10.
For cycli phosphate acid anhydride, the structural formula 1-structural formula 4 adopted in the embodiment of the present application is all application of four kinds of concrete structures of formula 1, be appreciated that, except structural formula 1-structural formula 4, other the cycli phosphate acid anhydride that possess formula 1 general formula close with these four structural formulas, such as R1, R2, R3 are repeatably selected from the alkyl, haloalkyl, alkenyl or alkynyl etc. of H or 1-6 carbon atom respectively, may be used to the application.
In sum, in the lithium ion battery of the application, the effective dose of each additive component of its electrolyte is, alkyl sultone 1-5%, fluorinated ethylene carbonate 1-10%, vinyl ethylene carbonate 0.1-2%; Although wherein fluorinated ethylene carbonate 1% and 10% can meet user demand, preferably scheme is about 5%; The consumption 0.1% and 2% of vinyl ethylene carbonate also can meet use, but preferably scheme is about 1%.In addition, optionally can also add at least one in cycli phosphate acid anhydride and fluorobenzene, the consumption of cycli phosphate acid anhydride is 0.1-2%, and the consumption of fluorobenzene is 1-20%; Wherein, the consumption of cycli phosphate acid anhydride is 0.1% and 2% can meet user demand, but preferred scheme is 0.5-1%; The consumption of fluorobenzene is being more than or equal to 1%, and when being less than 20%, effect is better, although also possess certain effect when consumption is 20%, compared with other consumption, effect is poor, and preferably consumption is 1-5%.
In the high compacted density negative electrode lithium ion battery of the application, its electrolyte with the addition of the additive of various component, thus make electrolyte can meet the demand of the lithium ion battery of high compacted density negative pole, make the lithium ion battery of the application have larger volume capacity density; And owing to adopting the electrolyte improved, the lithium ion battery of the application, easily infiltrates, and can ensure not analyse lithium, and normal temperature has extended cycle life and high-temperature storage performance is good, possesses good battery high-temperature behavior and normal-temperature circulating performance.
Above content is the further description done the application in conjunction with concrete execution mode, can not assert that the concrete enforcement of the application is confined to these explanations.For the application person of an ordinary skill in the technical field, under the prerequisite not departing from the application's design, some simple deduction or replace can also be made, all should be considered as the protection range belonging to the application.

Claims (10)

1. the lithium ion battery of a high compacted density negative pole, comprise positive pole, negative pole, barrier film and electrolyte, it is characterized in that: containing the alkyl sultone accounting for electrolyte total weight 1-5% in described electrolyte, account for the fluorinated ethylene carbonate of electrolyte total weight 1-10%, account for the vinyl ethylene carbonate of electrolyte total weight 0.1-2%; Further, the pole piece compaction density of described negative pole is not less than 1.65g/cm 3.
2. lithium ion battery according to claim 1, is characterized in that: the pole piece compaction density of described negative pole is not less than 1.70g/cm 3.
3. lithium ion battery according to claim 2, is characterized in that: also containing the cycli phosphate acid anhydride accounting for electrolyte total weight 0.1-2% in described electrolyte, described cycli phosphate acid anhydride has structure shown in formula 1;
Wherein R1, R2, R3 are repeatably selected from alkyl, haloalkyl, the alkenyl or alkynyl of H or 1-6 carbon atom respectively.
4. lithium ion battery according to claim 3, is characterized in that: described cycli phosphate acid anhydride is structural formula 1, at least one of structural formula 2, compound shown in structural formula 3 and structural formula 4;
5. lithium ion battery according to claim 2, is characterized in that: also containing the fluorobenzene accounting for electrolyte total weight 1-20% in described electrolyte.
6. the lithium ion battery according to any one of claim 1-5, is characterized in that: the active material of described positive pole is cobalt acid lithium, and the active material of described negative pole is graphite.
7. the lithium ion battery according to any one of claim 1-5, it is characterized in that: the organic solvent of described electrolyte is the mixed solvent of ethylene carbonate, diethyl carbonate and methyl ethyl carbonate composition, electrolyte is lithium hexafluoro phosphate, further, ethylene carbonate: diethyl carbonate: methyl ethyl carbonate=1:1:1.
8. the electrolyte for high compacted density negative electrode lithium ion battery, it is characterized in that: containing the alkyl sultone accounting for electrolyte total weight 1-5% in described electrolyte, account for the fluorinated ethylene carbonate of electrolyte total weight 1-10%, account for the vinyl ethylene carbonate of electrolyte total weight 0.1-2%.
9. electrolyte according to claim 8, is characterized in that: also containing the cycli phosphate acid anhydride accounting for electrolyte total weight 0.1-2% in described electrolyte, described cycli phosphate acid anhydride has structure shown in formula 1;
Wherein R1, R2, R3 are repeatably selected from alkyl, haloalkyl, the alkenyl or alkynyl of H or 1-6 carbon atom respectively.
10. electrolyte according to claim 8, is characterized in that: also containing the fluorobenzene accounting for electrolyte total weight 1-20% in described electrolyte.
CN201510037119.0A 2015-01-23 2015-01-23 High-compaction-density cathode lithium ion battery and electrolyte Pending CN104638293A (en)

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