CN103107368A - Lithium ion battery and electrolyte thereof - Google Patents
Lithium ion battery and electrolyte thereof Download PDFInfo
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- CN103107368A CN103107368A CN2013100471113A CN201310047111A CN103107368A CN 103107368 A CN103107368 A CN 103107368A CN 2013100471113 A CN2013100471113 A CN 2013100471113A CN 201310047111 A CN201310047111 A CN 201310047111A CN 103107368 A CN103107368 A CN 103107368A
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Abstract
The invention discloses lithium ion battery electrolyte. The electrolyte comprises a non-aqueous solvent and lithium salt dissolved in the non-aqueous solvent, wherein the non-aqueous solvent contains 1,4-butanediol-sulfate which is as shown in formula I, and the total mass of the 1,4-butanediol-sulfate accounts for 0.5 to 15 percent of the total mass of the non-aqueous solvent. According to the lithium ion battery electrolyte, the decomposition reaction of the electrolyte can be effectively inhibited, so that the high-temperature storage performance and the high-temperature circulating performance of the lithium ion battery can be improved, and the improvement effect can be maintained for a long time. Furthermore, the invention discloses a lithium ion battery using the lithium ion battery electrolyte. The formula I is shown in details.
Description
Technical field
The present invention relates to a kind of lithium ion battery and electrolyte thereof, more particularly, the present invention relates to a kind of lithium ion battery and electrolyte thereof with desirable high-temperature storage performance and high temperature cyclic performance.
Background technology
Lithium ion battery has that energy density is high, operating voltage is high, has extended cycle life, memory-less effect and the advantage such as environmentally friendly, has become the main power source of mobile consumer electronics, and the application at aspects such as electric automobile, intelligent grids also reaches its maturity.
The both positive and negative polarity of lithium ion battery all has higher activity, and to the lithium ion battery of Charging state, its negative pole has high reproducibility, is just having high oxidation, if without the protection of film for additive, common carbonate solvent easily and both positive and negative polarity generation side reaction.In actual use, the lasting use heating of electronic product (as notebook computer), battery environment for use temperature raise (as summer outdoor temperature can be near 40 ℃, the closed car inside of closing air-conditioning even can be up to 60 ℃) etc. factor battery is under the condition of high temperature.At high temperature, the reactivity of the both positive and negative polarity of battery further strengthens, and the side reaction speed of electrolyte and electrode is accelerated, and causes electrolyte decomposition to produce a large amount of gases, makes cell expansion be out of shape and causes the damage of electrical appliance.When serious, because the cell expansion distortion causes inside battery to be short-circuited or battery packages bursts and causes flammable electrolyte to be revealed, the risk that causes the security incidents such as fire is arranged.
In view of this, necessaryly provide a kind of lithium ion battery and electrolyte thereof with desirable high-temperature storage performance.
Summary of the invention
The object of the invention is to: a kind of lithium ion battery and electrolyte thereof with desirable high-temperature storage performance is provided.
In order to realize the foregoing invention purpose, the present inventor finds through further investigation: cyclic sulfates can improve the high-temperature storage characteristics of lithium ion battery, suppresses the expansion of high-temperature lithium ion battery storing process.But, the persistence of this improvement effect and the structure of cyclic sulfates are closely related: although the sulfuric ester of 5 rings, 6 rings can improve the high-temperature storage performance of lithium ion battery, but, its persistence of improving effect is relatively poor, after lithium ion battery was through long-term the placement, its rapid decay of effect that improves to high-temperature storage performance was lost even substantially; When on the ring of sulfuric ester, side chain being arranged, the lasting effect that high-temperature behavior is improved also can reduce; And the BDO sulfuric ester of 7 rings not only can improve high temperature circulation, the high-temperature storage performance of lithium ion battery significantly, even and this improve effect battery is long-time place after, can also well keep.
Based on above discovery, the invention provides a kind of lithium-ion battery electrolytes, it comprises nonaqueous solvents and the lithium salts that is dissolved in nonaqueous solvents, wherein, nonaqueous solvents contains the BDO sulfuric ester shown in formula I,
Formula I
Therefore contain the BDO sulfuric ester in lithium-ion battery electrolytes of the present invention, have good high temperature cyclic performance, high-temperature storage performance, even and these performances also can keep well after placing battery is long-time.Although at present to 1 of 7 rings, 4-butanediol sulfuric ester is more not clear than the concrete mechanism that the sulfuric ester of 5 rings, 6 rings has significant advantage, but it is believed that it to be due to 1,4-butanediol sulfuric ester is more stable at the passivating film that electrode surface generates, or 1, the structure of 4-butanediol sulfuric ester itself is more stable, therefore can significantly improve the high-temperature behavior of battery, and can keep for a long time good high-temperature behavior.
In order to make the good high-temperature behavior of the long-term maintenance of lithium ion battery, cyclic sulfates should be selected ring upper unbranched 7 ring sulfuric esters, i.e. BDO sulfuric ester.If encircle on too small (5 rings, 6 rings) or ring, side chain is arranged, it is relatively poor that high temperature improves the persistence of effect; If greater than 7 rings, because macrocyclic compound is difficult to synthesize, molecule increases and to cause viscosity to increase battery impedance is increased and without practical value.
As a kind of improvement of lithium-ion battery electrolytes of the present invention, the quality of described BDO sulfuric ester accounts for the 0.5%-15% of nonaqueous solvents gross mass.
As a kind of improvement of lithium-ion battery electrolytes of the present invention, the quality of described BDO sulfuric ester accounts for the 1%-5% of the gross mass of nonaqueous solvents.
Add the BDO sulfuric ester that quality accounts for nonaqueous solvents quality 0.5% in lithium-ion battery electrolytes, can observe it to the improvement effect of battery high-temperature behavior, and addition is higher, the high-temperature storage performance of battery is better.But along with the increase of BDO sulfuric ester addition, the conductivity of electrolyte reduces gradually, may cause the high rate performance of battery to come to harm, and causes causing potential safety hazard because the precipitating metal lithium produces Li dendrite.therefore, high temperature storage for balancing battery, cryogenic property and high rate performance, be necessary according to concrete positive and negative pole material, the electrode coating quality, electrode porosity and pore structure, other components of electrolyte and proportioning, the actual performance demand of battery etc., based on to 1, 4-butanediol sulfuric ester is to high-temperature behavior, the understanding of the impact of electrolytic conductivity, optimize 1, the addition of 4-butanediol sulfuric ester: after deliberation, 1, the content of 4-butanediol sulfuric ester is to account for the 0.5% ~ 15% comparatively suitable of nonaqueous solvents quality, can manifest high temperature higher than 0.5% and improve effect, if content is higher than 15% can be to the multiplying power of battery, cryogenic property produces considerable influence, preferably, the quality of BDO sulfuric ester is to account for the 1% ~ 5% comparatively suitable of nonaqueous solvents quality, and is when good properties at high temperature is provided, less to conductivity, the viscosity influence of electrolyte.
As a kind of improvement of lithium-ion battery electrolytes of the present invention, described nonaqueous solvents also contains ethylene carbonate, propene carbonate and diethyl carbonate.
As a kind of improvement of lithium-ion battery electrolytes of the present invention, described lithium salts is LiPF
6, LiBF
4, LiBOB, LiClO
4, LiAsF
6, LiCF
3SO
3, Li (CF
3SO
2)
2N or its combination.
In order to realize the foregoing invention purpose, the present invention also provides a kind of lithium ion battery, and it comprises positive pole, negative pole, is interval in the barrier film between positive pole and negative pole, and electrolyte, and wherein, electrolyte is aforementioned lithium-ion battery electrolytes.
As a kind of improvement of lithium ion battery of the present invention, described positive pole comprises the material that can deviate from, accept lithium ion, and described negative pole comprises the material that can accept, deviate from lithium ion.
As a kind of improvement of lithium ion battery of the present invention, the material that can deviate from, accept lithium ion that described positive pole comprises is lithium-transition metal composite oxide.
Lithium-transition metal composite oxide, particularly the Layered Lithium compound transition metal oxide has higher activity to the oxidation of organic solvent, the easier aerogenesis of high temperature storage, therefore the present invention contains 1, the electrolyte of 4-butanediol sulfuric ester is specially adapted to improve with lithium-transition metal composite oxide, and especially the Layered Lithium compound transition metal oxide is the high-temperature behavior of the lithium ion battery of positive electrode.
A kind of improvement as lithium ion battery of the present invention, described lithium-transition metal composite oxide is selected from lithium and cobalt oxides, lithium nickel oxide, lithium manganese oxide, Li, Ni, Mn oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, aforementioned lithium transition-metal oxide and adds the compound that other transition metal or nontransition metal obtain, or its combination.
A kind of improvement as lithium ion battery of the present invention, the material that can accept, deviate from lithium ion that described negative pole comprises be selected from soft carbon, hard carbon, Delanium, native graphite, silicon, silicon oxide compound, silicon-carbon compound, lithium titanate, can with lithium form alloy metal or alloy, can insert, deviate from the metal oxide of lithium or its combination.
Description of drawings
Below in conjunction with the drawings and specific embodiments, lithium ion battery of the present invention and electrolyte thereof are further elaborated, wherein:
Fig. 1 is that comparative example 1 to 4, the embodiment of the present invention 1 lithium ion battery are not done 50%SOC45 ℃ of placement, 50%SOC45 and ℃ placed 30 days, 50%SOC45 and ℃ place the thickness swelling of 90 days to the schematic diagrames of 60 ℃ of memory times.
Fig. 2 is the schematic diagram of the thickness swelling of comparative example 1, the embodiment of the present invention 1 ~ 8 lithium ion battery battery of not doing 50%SOC45 ℃ of placement to 60 ℃ of memory times.
Fig. 3 is the embodiment of the present invention 1,5 ~ 8 lithium ion batteries, to 4.3V, then is low to moderate 0.05C to charge to electric current under the 4.3V constant voltage with 0.5C multiplying power constant current charge, then places in 60 ℃ of baking ovens of constant temperature the schematic diagram of the expansion rate of battery to memory time.
Fig. 4 be the conductivity of electrolyte and BDO sulfuric ester in electrolyte mass percent concern schematic diagram.
Embodiment
In order to make goal of the invention of the present invention, technical scheme and useful technique effect more clear, below in conjunction with implementation column and accompanying drawing, the present invention is described in further detail, but, should be understood that, embodiments of the invention are only in order to explain the present invention, be not in order to limit the present invention, and embodiments of the present invention are not limited to the embodiment that provides in specification.
The configuration of electrolyte
The mass percent of table 1, each component of nonaqueous solvents (%)
| ? | EC | PC | DEC | Sulfuric ester kind and mass percent |
| Comparative example 1 | 40.00 | 10.00 | 50.00 | Nothing |
| Comparative example 2 | 38.60 | 9.65 | 48.25 | Sulfuric acid vinyl ester 3.50 |
| Comparative example 3 | 38.60 | 9.65 | 48.25 | 1,3-PD sulfuric ester 3.50 |
| Comparative example 4 | 38.60 | 9.65 | 48.25 | 1,3-BDO sulfuric ester 3.50 |
| Embodiment 1 | 38.60 | 9.65 | 48.25 | BDO sulfuric ester 3.50 |
| Embodiment 2 | 39.80 | 9.95 | 49.75 | BDO sulfuric ester 0.50 |
| Embodiment 3 | 39.60 | 9.90 | 49.50 | BDO sulfuric ester 1.00 |
| Embodiment 4 | 39.20 | 9.80 | 49.00 | BDO sulfuric ester 2.00 |
| Embodiment 5 | 38.80 | 9.70 | 48.50 | BDO sulfuric ester 3.00 |
| Embodiment 6 | 38.00 | 9.50 | 47.50 | BDO sulfuric ester 5.00 |
| Embodiment 7 | 36.00 | 9.00 | 45.00 | BDO sulfuric ester 10.00 |
| Embodiment 8 | 34.00 | 8.50 | 42.50 | BDO sulfuric ester 15.00 |
Ethylene carbonate (EC), propene carbonate (PC), diethyl carbonate (DEC), cyclic sulfates are mixed to get the electrolyte solvent of each comparative example, embodiment according to the mass ratio of table 1, dissolve in the LiPF of 1mol/L in solvent
6Namely obtain the nonaqueous electrolytic solution of each comparative example, embodiment, in table, the structure of each sulfuric ester is as follows:
Sulfuric acid vinyl ester 1,3-PD sulfuric ester 1,3-BDO sulfuric ester BDO sulfuric ester
The preparation of battery core
With positive active material LiNi
0.5Co
0.2Mn
0.3O
2(LNCM), conductive agent acetylene black, binding agent polyvinylidene fluoride (PVDF) is after 96:2:2 fully mixes in the 1-METHYLPYRROLIDONE dicyandiamide solution in mass ratio, is coated on the Al paper tinsel, drying and colding pressing makes anode pole piece.
After negative electrode active material Delanium, conductive agent acetylene black, binding agent butadiene-styrene rubber (SBR), thickener carboxymethyl cellulose sodium (CMC) are fully mixed in the deionized water solvent system according to mass ratio 95:1.5:2:1.5, be coated on the Cu paper tinsel, drying and colding pressing makes cathode pole piece.
With polyethylene (PE) porous membrane as barrier film.
Anode pole piece, barrier film, cathode pole piece are folded in order, made barrier film be in the middle buffer action that rises of positive/negative plate, reeling obtains naked battery core.Naked battery core is placed in the packing box of aluminum-plastic composite membrane, the electrolyte that injection prepares and encapsulation, carry out first charge-discharge with 0.1C multiplying power constant current, initial charge cut-ff voltage 4.0V, discharge cut-off voltage 3.0V, then, vacuum is got rid of a small amount of gas that first charge-discharge produces, and secondary encapsulation namely obtains each comparative example, each embodiment lithium ion battery.
The high temperature storage test
After battery completes, the battery of each comparative example, each embodiment is respectively got 5, at normal temperatures with 0.5C multiplying power constant current charge to 4.2V, further charge to electric current under the 4.2V constant voltage and be low to moderate 0.05C, make it be in the 4.2V fully charged state, measure full rechargable battery thickness (thickness before storage).Battery with fully charged state is placed in 60 ℃ of baking ovens of constant temperature again, after this took out battery in every 5 days, measure immediately the thickness of battery, then put back to and continue in 60 ℃ of baking ovens to place, after 15 days, primary cell thickness is measured in taking-up in every 3 days, in 30% or 60 ℃ of baking oven, reach 45 days standing time until the thickness swelling of battery surpasses, and stops test.According to the thickness swelling after the corresponding number of days of following formula calculating battery storage.
Thickness x100% before thickness swelling=(thickness before thickness after storage-storage)/storage
Get each 5, the battery of comparative example 2 ~ 4, embodiment 1, be discharged to 3.0V with 0.5C multiplying power constant current, then with 0.5C multiplying power constant current charge 1 hour, make battery be in 50% state-of-charge (50%SOC).Battery was placed in 45 ℃ of environment of constant temperature 30 days, taken out with 0.5C multiplying power constant current charge to 4.2V, then be low to moderate 0.05C to charge to electric current under the 4.2V constant voltage.Measure cell thickness (thickness before storage), then place in 60 ℃ of baking ovens of constant temperature, once took out in front 15 days every 5 days and measure cell thickness, store after 15 days once to take out in every 3 days and measure cell thickness, calculate the mean value of the thickness swelling of cell thickness expansion rate and 5 batteries of every example, the cell thickness expansion rate surpasses 30% or stop test when reaching 45 days memory time.According to identical method, the battery of measurement Comparative Examples 3 and embodiment 1 is placed 90 days with 50% state-of-charge in 45 ℃ of environment after, the thickness swelling situation of the lower 60 ℃ of storages of 4.2V fully charged state.
The battery, 50%SOC45 that the battery, 50%SOC45 that each comparative example, embodiment 1 do not do 50%SOC45 ℃ of placement ℃ placed 30 days ℃ place 90 days battery the storage thickness swelling to 60 ℃ of memory times as shown in Figure 1.Comparative example 1, embodiment 1 ~ 8 do not do 50%SOC45 ℃ of placement battery the storage thickness swelling to 60 ℃ of memory times as shown in Figure 2.
Get each 5, comparative example, embodiment 1,5 ~ 8 battery, to 4.3V, then be low to moderate 0.05C to charge to electric current under the 4.3V constant voltage with 0.5C multiplying power constant current charge.Test battery thickness (thickness before storage), then place in 60 ℃ of baking ovens of constant temperature, once took out in every 3 days and measure cell thickness, calculate the mean value of the thickness swelling of cell thickness expansion rate and 5 batteries of every example, the cell thickness expansion rate surpasses 30% or stop the storage test when reaching 45 days memory time, the expansion rate of battery to memory time as shown in Figure 3.
In order to verify that can sulfuric ester bring into play the effect that high temperature improves for a long time, the present invention uses battery 50% state-of-charge to place under 45 ℃ of environment, with its sulfuric ester lasting effect that high temperature storage is improved in actual use of speeding-up simulation.As seen from Figure 1, for the battery of just having made, namely be the battery of 0 day standing time under 45 ℃ of environment of constant temperature, and several sulfuric esters all help to suppress the thickness swelling of the battery that the aerogenesis of lithium ion battery under high temperature storage cause, and can play the purpose of improving high-temperature behavior.During without sulfuric ester, battery was placed 5 days in 60 ℃ of baking ovens, and thickness swelling namely surpasses 10%; And after adding the various sulfuric esters of mass ratio 3.5% in solvent, the thickness swelling of 60 ℃ of storages of battery has obvious inhibitory action, and comparative example 2,3,4 battery can be maintained to respectively 21 days, 30 days, 24 days without obviously expanding; Embodiment 1(1,4-butanediol sulfuric ester) effect is best, until test in 45 days finishes, cell thickness is also without obviously expansion.But, when battery with 50%SOC after placing certain hour under 45 ℃ of environment, the high temperature of the cyclic sulfates of each comparative example improves effect to be rapid decay to disappear; Comparative example 2 (sulfuric acid vinyl ester), comparative example 4 (1,3-butanediol sulfuric ester) battery with 50%SOC after placing 30 days under 45 ℃ of environment, the high temperature of sulfuric ester improves effect and substantially disappears, interpolation is even also fast than the comparative example 1 that does not add sulfuric ester with the expansion rate of the battery of the 1,3-BDO sulfuric ester (comparative example 4) of side chain; The battery of comparative example 3 (1,3-PD sulfuric ester) namely began rapid expanding after 21 days, thickness swelling namely surpassed 10% in 24 days; And if battery is tested its fully charged state with 50%SOC again after placing 90 days under 45 ℃ of environment high-temperature storage performance, the battery of comparative example 3 is stored in the 10th day battery thickness swelling at 60 ℃ and has namely reached 10%, thereafter rapid growth especially.As seen, the high temperature of the cyclic sulfates of comparative example improves can't be lasting, and in the actual use procedure of battery, the high-temperature storage performance of battery can run down, and therefore can't satisfy actual demand.Of the present invention 1,4-butanediol sulfuric ester is after placing 30 days or 90 days under 45 ℃, still keep 60 ℃ of good memory properties, after storage in 45 days, battery does not obviously expand, show 1,4-butanediol sulfuric ester has extraordinary persistence to the improvement of battery high-temperature behavior, can make the good high-temperature behavior of maintenance in the long-time use procedure of lithium ion battery.
The advantage on high-temperature storage performance is improved that the BDO sulfuric ester of 7 rings shows with respect to the sulfuric ester of 5 rings, 6 rings and the distinctive persistence that high temperature storage is improved thereof, its mechanism is not clear at present.Possible reason is: the BDO sulfuric ester is highly stable at the passivating film that electrode surface generates, and makes battery have superior high warm nature, and the good high-temperature behavior of energy long term maintenance; Or the stability of BDO sulfuric ester is higher than the sulfuric ester of 5 rings, 6 rings, can steady in a long-termly exist in battery, therefore can keep for a long time the effect of improving to battery high-temperature behavior.1 of 8 rings, the 5-pentanediol might also have similar advantage, but the synthetic too difficulty of macrocyclic compound, and because the upper alkyl chain of ring is long, can expect that the sulfuric ester that adds 8 rings will cause the increase of electrolyte viscosity, conductivity to reduce and the SEI membrane impedance increases, therefore not have practicality.
Compare 1 of variable concentrations, the high-temperature storage performance of 4-butanediol sulfuric ester, as seen from Figure 4, when its concentration reach solvent quality 0.5% the time show the obvious effect of improving, raising along with concentration, the high-temperature storage performance of battery improves gradually, and when its concentration reaches 3% and when above, battery completely fills under condition 60 ℃ of storages at 4.2V and significantly do not expand in 45 days.The high-temperature storage performance of testing battery charging during to 4.3V, result as shown in Figure 4, the sulfuric ester of high concentration shows better high-temperature storage performance, when 1, the concentration of 4-butanediol sulfuric ester reaches 15% and when above, even store under 4.3V, battery also shows remarkable high-temperature behavior, stores and has no obvious expansion in 45 days.
Contain 0.5% above BDO sulfuric ester in electrolyte solvent high-temperature behavior namely is improved effect, raising concentration can obtain better high temperature and improve effect, so the content of additive is with comparatively suitable more than 0.5%.And according to practical application, the positive pole of the demand of high-temperature behavior, battery and negative material are formed conditions such as impact on high-temperature behavior with other of the reactivity of electrolyte, electrolyte under high temperature and charged state, but flexible choice suitable 1, the addition of 4-butanediol is to satisfy the high-temperature behavior requirement of battery.
Lithium-transition metal composite oxide is more intense to the oxidation activity of organic solvent, the problem that high temperature storage, high temperature circulation face is larger, and therefore additive of the present invention is particularly suitable for improving the high-temperature behavior of the battery take lithium transition-metal oxide as positive electrode.Wherein, the stratiform transiting metal oxidation is as the lithium cobalt oxygen (LiCoO of stratiform
2), lithium nickel cobalt manganese oxygen (LiNi
xCo
yMn
1-x-yO
2), be an active especially high class material in lithium-transition metal composite oxide, therefore additive of the present invention especially is suitable for improving take the high-temperature behavior of Layered Lithium compound transition metal oxide as anodal lithium ion battery.
The measurement of electrolytic conductivity
Measure the conductivity of the electrolyte (electrolyte that namely contains variable concentrations BDO sulfuric ester) of Comparative Examples 1 and embodiment 1 ~ 8 under 25 ℃ of environment, conductivity to the relation with contents of BDO sulfuric ester in solvent as shown in Figure 4.
As seen from Figure 4, along with in electrolyte 1, the rising of 4-butanediol sulfuric ester content, the conductivity of electrolyte reduces gradually, when the content when it in solvent is 5%, the conductivity of electrolyte namely has been reduced to approximately 6.8mS/cm by the approximately 7.4mS/cm of the electrolyte that does not add sulfuric ester, and when its content was 10%, the conductivity of electrolyte had been reduced to approximately 6.6mS/cm.At this moment, the reduction of electrolytic conductivity will obviously make the multiplying power discharging property of battery worsen, because the easier precipitating metal lithium of negative pole internal polarization inequality produces Li dendrite.The size of the conductivity of electrolyte on the impact of the possibility of battery multiplying power discharging property, precipitating metal lithium generation Li dendrite, be subjected to the parameter influences such as interfacial tension of tortuosity, electrolyte and the electrode in the porosity of coating thickness, electrode interior of electrode and hole, consider from conductivity and on the angle of battery performance impact, 1, the suitable interpolation upper limit of 4-butanediol sulfuric ester can be obtained by test relatively easily.
Comprehensive impact on high-temperature behavior, conductivity, reach the factors such as common battery material, battery design, the addition that the BDO sulfuric ester is comparatively optimized is 0.5% ~ 15% of electrolyte solvent quality, can improve the high-temperature behavior of battery, and less on the conductivity impact of electrolyte; The addition of more optimizing is 1% ~ 5%, can satisfy the high-temperature storage performance of battery, and can keep higher conductivity.
The announcement of book and instruction according to the above description, those skilled in the art in 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 consist of any restriction to the present invention just for convenience of description.
Claims (10)
1. lithium-ion battery electrolytes, it comprises nonaqueous solvents and is dissolved in lithium salts in nonaqueous solvents, it is characterized in that: described nonaqueous solvents contains the BDO sulfuric ester shown in formula I, namely
2. lithium-ion battery electrolytes according to claim 1, it is characterized in that: described BDO sulfuric ester quality accounts for the 0.5%-15% of nonaqueous solvents gross mass.
3. lithium-ion battery electrolytes according to claim 1, it is characterized in that: described BDO sulfuric ester quality accounts for the 1%-5% of the gross mass of nonaqueous solvents.
4. lithium-ion battery electrolytes according to claim 1, it is characterized in that: described nonaqueous solvents contains ethylene carbonate, propene carbonate and diethyl carbonate.
5. lithium-ion battery electrolytes according to claim 1, it is characterized in that: described lithium salts is LiPF
6, LiBF
4, LiBOB, LiClO
4, LiAsF
6, LiCF
3SO
3, Li (CF
3SO
2)
2N or its combination.
6. lithium ion battery, it comprises positive pole, negative pole, is interval in the barrier film between positive pole and negative pole, and electrolyte, it is characterized in that: described electrolyte is the described lithium-ion battery electrolytes of any one in claim 1 to 5.
7. lithium ion battery according to claim 6, it is characterized in that: described positive pole comprises the material that can deviate from, accept lithium ion, and described negative pole comprises the material that can accept, deviate from lithium ion.
8. lithium ion battery according to claim 7, it is characterized in that: the material that can deviate from, accept lithium ion that described positive pole comprises is lithium-transition metal composite oxide.
9. lithium ion battery according to claim 8, it is characterized in that: described lithium-transition metal composite oxide is selected from lithium and cobalt oxides, lithium nickel oxide, lithium manganese oxide, Li, Ni, Mn oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, aforementioned lithium transition-metal oxide and adds the compound that other transition metal or nontransition metal obtain, or its combination.
10. lithium ion battery according to claim 7, it is characterized in that: the material that can accept, deviate from lithium ion that described negative pole comprises be selected from soft carbon, hard carbon, Delanium, native graphite, silicon, silicon oxide compound, silicon-carbon compound, lithium titanate, can with lithium form alloy metal or alloy, can insert, deviate from the metal oxide of lithium, or its combination.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887563A (en) * | 2014-04-08 | 2014-06-25 | 厦门首能科技有限公司 | Lithium ion secondary battery electrolyte |
| CN105409050A (en) * | 2013-10-25 | 2016-03-16 | 株式会社Lg化学 | Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery comprising same |
| CN105990602A (en) * | 2015-02-24 | 2016-10-05 | 江苏省新动力电池及其材料工程技术研究中心有限公司 | Method for manufacturing high-capacity high-power power type lithium ion battery |
| CN109728370A (en) * | 2018-12-25 | 2019-05-07 | 惠州市纬世新能源有限公司 | A kind of storage method improving lithium battery performance |
| CN110970659A (en) * | 2018-09-28 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Non-aqueous electrolyte and lithium ion battery |
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| CN102646847A (en) * | 2012-02-17 | 2012-08-22 | 深圳新宙邦科技股份有限公司 | Lithium ion secondary battery and electrolyte thereof |
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| CN103887563A (en) * | 2014-04-08 | 2014-06-25 | 厦门首能科技有限公司 | Lithium ion secondary battery electrolyte |
| CN105990602A (en) * | 2015-02-24 | 2016-10-05 | 江苏省新动力电池及其材料工程技术研究中心有限公司 | Method for manufacturing high-capacity high-power power type lithium ion battery |
| CN110970659A (en) * | 2018-09-28 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Non-aqueous electrolyte and lithium ion battery |
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