CN103346350A - Electrolyte for improving performance of lithium ion battery and battery - Google Patents
Electrolyte for improving performance of lithium ion battery and battery Download PDFInfo
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Abstract
The invention discloses electrolyte for improving the performance of a lithium ion battery and the lithium ion battery. The lithium ion battery electrolyte is prepared from electrolyte solute, a solvent and an additive, wherein the additive contains succinic anhydride and maleic anhydride derivatives and conventional additives. As the succinic anhydride and maleic anhydride derivatives are used as one electrolyte additive, the degree of unsaturation of the substance is higher, the substance prior to EC and VC can generate reduction reaction on a graphite cathode surface to form a compact and stable SEI (Solid Electrolyte Interphase) film, inhibits the solvent to further resolve, improves the cycle performance of the battery, significantly increase the high-temperature cycle and storage performance of the battery, and has a good technical effect.
Description
Technical field
Improve the electrolyte and battery of performance of lithium ion battery the invention belongs to a kind of, be mainly used in improving the cycle performance and high-temperature behavior of lithium ion battery.
Background technology
Lithium ion battery is compared with other secondary cells (NI-G, ni-mh, plumbic acid), with energy density is big, operating voltage is high, have extended cycle life, self discharge is low, environmental protection, memory-less effect, wide operating temperature range the features such as, quickly grown since being emerged from 92 years, the equipment such as mobile phone, notebook computer, panel computer, digital camera, portable power source are widely used at present, and there is wide application prospect in fields such as electric automobile, energy-accumulating power station systems.
Lithium ion battery is mainly made up of materials such as positive pole, negative pole, electrolyte, barrier films；The effect of electrolyte is conduction electric charge, huge for the multiplying power of lithium ion battery, cycle performance, high temperature performance, security performance influence.Conventional lithium-ion battery electrolytes use non-aqueous organic system, and main electrolyte is LiPF6Mixed using the linear carbonate (such as dimethyl carbonate DMC, methyl ethyl carbonate EMC, diethyl carbonate DEC) of the cyclic carbonate (such as ethylene carbonate EC, propene carbonate PC) of high-k and low viscosity as solvent, and be aided with a small amount of additive to improve battery performance.
In the prior art, in battery charge and discharge process, electrolyte can decompose reaction on positive and negative electrode surface, cause the consumption of electrolyte and the increase of both positive and negative polarity interface impedance, or even destruction negative electrode active material structure, cause battery performance to deteriorate.Solvent EC can occur reduction in negative terminal surface and form passivating film, suppress solvent and further decompose；But the SEI membrane impedances of EC formation are larger, and it is not sufficiently stable.Subsequent research is found, VC (vinylene carbonate) is added in the electrolytic solution, FEC (fluorinated ethylene carbonate), the additives such as VEC (ethylene carbonate vinylene), it can be reduced prior to solvent in negative terminal surface, form the good SEI films of fine and close, lithium ion conduction ability, suppress the decomposition of solvent, battery first charge-discharge efficiency is improved, improves battery normal-temperature circulating performance.However, practical application is to the cycle life of lithium ion battery and the requirement more and more higher of high-temperature behavior；The SEI films of additive VC, FEC formation are not sufficiently stable under the high temperature conditions, it may occur that decomposed；Electrolyte is decomposed with may proceed in negative terminal surface in subsequent charge and discharge process, causes battery flatulence, penalty, or even bring potential safety hazard；And although VEC can improve battery high-temperature behavior to a certain extent, the SEI impedances that it is formed are larger, influence the capacity of battery.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of electrolyte of improvement performance of lithium ion battery, for transforming the cycle performance and high-temperature behavior of lithium ion battery, in addition, also disclosing a kind of lithium ion battery for including above-mentioned electrolyte.
The technical scheme that present invention solution above-mentioned technical problem is taken is as follows：
A kind of to improve the electrolyte of performance of lithium ion battery, the lithium-ion battery electrolytes are made up of electrolyte solute, solvent and additive, wherein, additive includes succinic anhydride, maleic anhydride derivative and conventional additives.
Further, it is preferred that, one or more of the conventional additives in vinylene carbonate VC, fluorinated ethylene carbonate FEC, ethylene carbonate vinylene VEC；The succinic anhydride, maleic anhydride derivative are selected from 2- methyl-maleic anhydride, 2, the fluoro- maleic anhydrides of 3- bis-, 3- oxabicyclos [3.1.0]-hexamethylene -2, one or more in 4- diketone, 2,2- dimethyl-succinic anhydride, tetrabydrophthalic anhydride.
Further, it is preferred that, the succinic anhydride, the content of maleic anhydride derivative account for the ratio of electrolyte gross mass in the range of 0.01%-8% (w.t.).
Further, it is preferred that, the additive level accounts for the ratio of electrolyte gross mass in the range of 0.1%-10% (w.t.).
Further, it is preferred that, the ratio that the succinic anhydride, the content of maleic anhydride derivative account for electrolyte gross mass is controlled at 0.2-4% (w.t.).
The electrolyte solute includes LiPF6、LiBF4, LiBOB, LiTFSI one or more therein.
Solvent for use includes the one or more in ethylene carbonate EC, propene carbonate PC, butylene BC, dimethyl carbonate DMC, methyl ethyl carbonate EMC, diethyl carbonate DEC, methyl propyl carbonate MPC, gamma butyrolactone GBL.
A kind of lithium ion battery, including positive pole, negative pole and the barrier film between positive pole and negative pole, it is characterised in that take the electrolyte of foregoing improvement performance of lithium ion battery, wherein, the material of the lithium ion cell positive includes LiNixCoyMn1-x-yO2(the ＜ y ＜ 1 of 0 ＜ x ＜ 1,0) or LiCoO2, the material of the negative pole of lithium ion battery includes Delanium.
Further, it is preferred that, the material of the lithium ion cell positive is specially：LiN0.33Mn0.33Co0.33O2, acetylene black, polyvinylidene fluoride PVDF, mass ratio is 94: 3: 3.
Further, it is preferred that, the specific material of material of the negative pole of the lithium ion battery is Delanium, acetylene black, sodium carboxymethylcellulose CMC, styrene butadiene rubber sbr, and mass ratio is 94: 1.5: 2: 2.5.
After such scheme, succinic anhydride, maleic anhydride derivative as electrolysis additive one kind, such material degree of unsaturation is higher, can occur reduction reaction on graphite cathode surface prior to EC, VC, form fine and close, stable SEI films, suppress the further decomposition of solvent, improve the cycle performance of battery, and significantly improve the high temperature circulation and storge quality of battery.
Other features and advantages of the present invention will be illustrated in the following description, also, is partly become apparent from specification, or is understood by implementing the present invention.The purpose of the present invention and other advantages can be realized and obtained by specifically noted structure in the specification, claims and accompanying drawing write.
Brief description of the drawings
The present invention is described in detail below in conjunction with the accompanying drawings, to cause the above-mentioned advantage of the present invention definitely.Wherein,
Fig. 1 is succinic anhydride, the chemical constitution schematic diagram of maleic anhydride derivative in additive of the present invention.
Embodiment
Describing embodiments of the present invention in detail below with reference to drawings and Examples, how application technology means solve technical problem to the present invention whereby, and reaching the implementation process of technique effect can fully understand and implement according to this.As long as it should be noted that not constituting conflict, each embodiment in the present invention and each feature in each embodiment can be combined with each other, and the technical scheme formed is within protection scope of the present invention.
Improve the electrolyte of cycle performance of lithium ion battery and high-temperature storage performance the invention provides a kind of, and using the lithium rechargeable battery of the electrolyte.
Specifically, described to improve the electrolyte of performance of lithium ion battery, the lithium-ion battery electrolytes are made up of electrolyte solute, solvent and additive, wherein, additive includes succinic anhydride, maleic anhydride derivative and conventional additives.
Further, it is preferred that, one or more of the conventional additives in ethylene carbonate VC, fluorinated ethylene carbonate FEC, ethylene carbonate vinylene VEC；The succinic anhydride, maleic anhydride derivative are selected from 2- methyl-maleic anhydride, 2, the fluoro- maleic anhydrides of 3- bis-, 3- oxabicyclos [3.1.0]-hexamethylene -2, one or more in 4- diketone, 2,2- dimethyl-succinic anhydride, tetrabydrophthalic anhydride.As shown in Figure 1, in the particular embodiment, the succinic anhydride, maleic anhydride derivative include 2- methyl-maleic anhydride (a in Fig. 1), 2, the fluoro- maleic anhydrides of 3- bis- (b in Fig. 1), 3- oxabicyclos [3.1.0]-hexamethylene -2,4- diketone (c in Fig. 1), 2, one or more in 2- dimethyl-succinic anhydride (d in Fig. 1), tetrabydrophthalic anhydride (e in Fig. 1), it is preferred that 2- methyl-maleic anhydride (a), 3- oxabicyclos [3.1.0]-hexamethylene -2,4- diketone (c).
Wherein, the present invention is used as electrolysis additive using succinic anhydride, maleic anhydride derivative, such material degree of unsaturation is higher, can occur reduction reaction on graphite cathode surface prior to EC, VC, form fine and close, stable SEI films, suppress the further decomposition of solvent, improve the cycle performance of battery, and significantly improve the high temperature circulation and storge quality of battery；It is smaller using the internal resistance of cell of the additive, the performance of battery capacity is not influenceed.
Further, since when the content of additive succinic anhydride derivative in the electrolytic solution is too low, negative terminal surface can not form complete, fine and close SEI films, the cycle performance and high-temperature behavior of battery cannot effectively improve；When succinic anhydride derivative too high levels in the electrolytic solution, the SEI films of formation can be thicker, and the internal resistance of cell is larger, and internal polarization is stronger in charge and discharge process, influences the big multiplying power discharging property and cycle performance of battery.The ratio that the content of succinic anhydride derivative accounts for electrolyte gross mass is controlled in the range of 0.01%-8% (w.t.), preferably 0.2-4% (w.t.)；The ratio that the total content of additive therefor accounts for electrolyte gross mass is controlled at 0.1%-10% (w.t.).
Wherein, electrolyte solute used includes lithium hexafluoro phosphate (LiPF6), LiBF4 (LiBF4), di-oxalate lithium borate (abbreviation LiBOB), bis trifluoromethyl sulfimide lithium (LiN (SO2CF3)2, abbreviation LiTFSI) etc. one or more therein, wherein it is preferred that LiPF6Or LiPF6It is used in mixed way with other lithium salts (electrolyte solute).
Wherein, solvent for use includes the one or more in ethylene carbonate EC, propene carbonate PC, butylene BC, dimethyl carbonate DMC, methyl ethyl carbonate EMC, diethyl carbonate DEC, methyl propyl carbonate MPC, gamma butyrolactone GBL；In order to improve the high-temperature behavior of battery, the content for the increase boiling point high solvent (such as EMC, DEC, MPC, PC) that should try one's best.
Present invention also offers the lithium ion battery using the nonaqueous electrolytic solution, the anode is LiNixCoyMn1-x-yO2(the ＜ y ＜ 1 of 0 ＜ x ＜ 1,0) or LiCoO2, negative pole is Delanium, and the barrier film between positive and negative pole material.
Specifically, the material of the lithium ion cell positive is specially：LiNi0.33Mn0.33Co0.33O2, acetylene black, polyvinylidene fluoride PVDF, mass ratio is 94: 3: 3.
The specific material of material of the negative pole of the lithium ion battery is Delanium, acetylene black, sodium carboxymethylcellulose CMC, styrene butadiene rubber sbr, and mass ratio is 94: 1.5: 2: 2.5.
In order to which technology contents, the implementation result of the present invention is expanded on further, it is explained with reference to implementation below.
Battery makes：
It is prepared by positive pole：Positive electrode proportioning is LiNi0.33Mn0.33Co0.33O2(ternary material 1: 1: 1, active material), acetylene black (conductive agent), polyvinylidene fluoride (PVDF, binding agent) mass ratio is 94: 3: 3；PVDF is added in N- methyl-pyrrolidons (NMP), high-speed stirred is completely dissolved it, forms uniform solution；Acetylene black is added into solution, is stirred；Then ternary material is added, uniform anode sizing agent is stirred into；Anode sizing agent is applied in aluminum foil current collector, pole piece is toasted, is compacted, cut-parts, soldering polar ear.
It is prepared by negative pole：Negative material charge ratio is Delanium (active material), and acetylene black (conductive agent), sodium carboxymethylcellulose (thickener, CMC) butadiene-styrene rubber (binding agent, SBR) mass ratio is 94: 1.5: 2: 2.5；CMC is added to the water, high-speed stirred is completely dissolved it；Then acetylene black is added, continues to stir until uniform；Delanium powder is continuously added, after dispersed with stirring is uniform, SBR is added, is dispersed into uniform cathode size；Cathode size is applied in copper foil current collector, pole piece is toasted, is compacted, cut-parts, soldering polar ear.
It is prepared by electrolyte：In glove box, by up-to-standard solvent, such as ethylene carbonate (EC) methyl ethyl carbonate (EMC) diethyl carbonate (DEC) in mass ratio 3: 4: 3 is mixed, and then adds LiPF6It is 1mol/L to concentration, is stirred continuously during this, then various additives (such as vinylene carbonate VC, fluorinated ethylene carbonate FEC, succinic anhydride derivative) needed for adding by mass percentage.Qualified electrolyte need to meet H2O ＜ 20ppm, HF ＜ 50ppm.
Battery is assembled：Cathode pole piece, barrier film, anode pole piece are wound into battery roll core, barrier film is between anode pole piece and cathode pole piece；Core is put into battery case bag, baking, fluid injection, sealing；By battery standing 24 hours, then with 0.05C constant-current charges to 3.95V, then vacuum degassing, secondary encapsulation；4.2V is charged to 0.5C electric currents, terminated when then 4.2V constant-voltage charges to electric current drops to 0.05C；Using 0.2C multiplying power dischargings to voltage as 3.0V, the capacity of battery 0.2C electric discharges is obtained；The soft-package battery nominal capacity of making is 1000mAh.
Wherein, test process in conjunction with specific embodiments is illustrated：
Battery testing：
High temperature circulation is tested：
Under the conditions of 55 DEG C, battery is charged into 4.2V in the way of 1C multiplying powers constant current-constant pressure, cut-off current is 0.05C；Then with 1C constant-current discharges to 3.0V, a 1C charge and discharge cycles are completed；Above-mentioned charge and discharge process is repeated, with the discharge capacity divided by the discharge capacity of first time of the 200th time, the capability retention of circulation 200 times is obtained.
60 DEG C of high-temperature storage tests：
By battery with 0.5C multiplying powers constant-current constant-voltage charging to 4.2V, then battery is put into 60 DEG C of baking ovens, battery is taken out after 7 days, cell thickness is tested while hot, internal resistance is tested after battery is down to room temperature by test cell thickness, internal resistance；
Cell thickness before cell thickness bulging rate=(cell thickness before cell thickness-storage after storage)/storage.
Comparative example 1：
Composition is used for 1M LiPF6EC/EMC/DEC (3: 4: 3, w.t.) electrolyte, and ternary material LiNi0.33Mn0.33Co0.33O2Positive pole, artificial plumbago negative pole is assembled into battery.
Comparative example 2：
Composition is used for 1M LiPF6EC/EMC/DEC (3: 4: 3, w.t.) electrolyte, the vinylene carbonate VC that addition weight/mass percentage composition is 1%, and ternary material LiNi0.33Mn0.33Co0.33O2Positive pole, artificial plumbago negative pole is assembled into battery.
Comparative example 3：
Composition is used for 1M LiPF6EC/EMC/DEC (3: 4: 3, w.t.) electrolyte, the fluorinated ethylene carbonate FEC that addition weight/mass percentage composition is 1%, and ternary material LiNi0.33Mn0.33Co0.33O2Positive pole, artificial plumbago negative pole is assembled into battery.
Embodiment 1：
Electrolyte composition is 1M LiPF6EC/EMC/DEC (3: 4: 3, w.t.), and add 2- methyl-maleic anhydride (a) that weight/mass percentage composition is 1%；Other processes are identical with comparative example.
Embodiment 2：
Electrolyte composition is 1M LiPF6EC/EMC/DEC (3: 4: 3, w.t.), and add the fluoro- maleic anhydrides (b) of 2,3- bis- that weight/mass percentage composition is 1%；Other processes are identical with comparative example.
Embodiment 3：
Electrolyte composition is 1M LiPF6EC/EMC/DEC (3: 4: 3, w.t.), and add 3- oxabicyclos [3.1.0]-hexamethylene -2,4- diketone (c) that weight/mass percentage composition is 1%；Other processes are identical with comparative example.
Embodiment 4：
Electrolyte composition is 1M LiPF6EC/EMC/DEC (3: 4: 3, w.t.), and add 2,2- dimethyl-succinic anhydride (figure d) that weight/mass percentage composition is 1%；Other processes are identical with comparative example.
Embodiment 5：
Electrolyte composition is 1M LiPF6EC/EMC/DEC (3: 4: 3, w.t.), and add the tetrabydrophthalic anhydride (e) that weight/mass percentage composition is 1%；Other processes are identical with comparative example.
Embodiment 6：
Electrolyte composition is 1M LiPF6EC/EMC/DEC (3: 4: 3, w.t.), and add 2- methyl-maleic anhydride (a) that weight/mass percentage composition is 0.2%；Other processes are identical with comparative example.
Embodiment 7：
Electrolyte composition is 1M LiPF6EC/EMC/DEC (3: 4: 3, w.t.), and add 2- methyl-maleic anhydride (a) that weight/mass percentage composition is 2%；Other processes are identical with comparative example.
Embodiment 8：
Electrolyte composition is 1M LiPF6EC/EMC/DEC (3: 4: 3, w.t.), and add 2- methyl-maleic anhydride (a) that weight/mass percentage composition is 4%；Other processes are identical with comparative example.
Embodiment 9：
Electrolyte composition is 1M LiPF6EC/EMC/DEC (3: 4: 3, w.t.), and add 2- methyl-maleic anhydride (a) that weight/mass percentage composition is 1%, and the vinylene carbonate VC that weight/mass percentage composition is 1%；Other processes are identical with comparative example.
Embodiment 10：
Electrolyte composition is 1M LiPF6EC/EMC/DEC (3: 4: 3, w.t.), and add 3- oxabicyclos [3.1.0]-hexamethylene -2,4- diketone (c) that weight/mass percentage composition is 0.2%；Other processes are identical with comparative example.
Embodiment 11：
Electrolyte composition is 1M LiPF6EC/EMC/DEC (3: 4: 3, w.t.), and add 3- oxabicyclos [3.1.0]-hexamethylene -2,4- diketone (c) that weight/mass percentage composition is 2%；Other processes are identical with comparative example.
Embodiment 12：
Electrolyte composition is 1M LiPF6EC/EMC/DEC (3: 4: 3, w.t.), and add 3- oxabicyclos [3.1.0]-hexamethylene -2,4- diketone (c) that weight/mass percentage composition is 4%；Other processes are identical with comparative example.
Embodiment 13：
Electrolyte composition is 1M LiPF6EC/EMC/DEC (3: 4: 3, w.t.), and add 3- oxabicyclos [3.1.0]-hexamethylene -2,4- diketone (c) that weight/mass percentage composition is 1%, and the fluorinated ethylene carbonate FEC that weight/mass percentage composition is 1%；Other processes are identical with comparative example.
Wherein, the data of 55 DEG C of 1C circulations of battery and 60 degree of high-temperature storage see the table below：
Analyze comparative example 1~3 to understand, after addition 1%VC (comparative example 2), cycle performance of the battery at 55 DEG C slightly improves, and cell expansion rate is more in a slight decrease than the battery without VC after high-temperature storage；And (comparative example 3) is added after 1%FEC, the high temperature circulation and storge quality of battery are deteriorated；This is due to that the SEI film heat endurances that additive FEC is formed are poor, destructurized at relatively high temperatures, and subsequent SEI films reparation reaction result in irreversible capacity and aerogenesis.
The test result of embodiment 1~5 is shown, it with the addition of after succinic anhydride derivative, the initial capacity of battery is in a slight decrease, but the capability retention after being circulated at 55 DEG C has different degrees of raising, wherein 3- oxabicyclos [3.1.0]-hexamethylene -2, 4- diketone (c), 2- methyl-maleic anhydride (a) is stronger to the improvement of high temperature circulation and storge quality, additive 2, the fluoro- maleic anhydrides of 3- bis- (b in figure), 2, 2- dimethyl-succinic anhydride (d in figure), improvement of the tetrabydrophthalic anhydride (e in figure) to high temperature circulation is slightly worse；
2- methyl-maleic anhydride (a in figure), 2, the fluoro- maleic anhydrides of 3- bis- (b in figure), 3- oxabicyclos [3.1.0]-hexamethylene -2,4- diketone (c in figure), 2,2- dimethyl-succinic anhydride (d in figure), tetrabydrophthalic anhydride (e in figure)
Because succinic anhydride derivative reduction potential is higher, the preferential film forming during initial charge, it is suppressed that continue occur side reaction between solvent and negative pole；Simultaneously because the degree of unsaturation of additive is higher (containing double bond and cyclic structure), the product of reduction reaction has similar netted structure, the SEI film better heat stabilities of such material composition, so the high-temperature behavior of battery is improved (correspondence embodiment 1~5).
Additive 2, the fluoro- maleic anhydrides (b) of 3- bis- contain the additive not reacted in F elements, electrolyte can decompose generation HF at high temperature, and HF can destroy SEI films, and the SEI films reparation in subsequent process can produce irreversible capacity；So the performance of additive b and FEC at high temperature is not good (this point is compared similar with FEC).And tetrabydrophthalic anhydride, because containing larger cyclic structure, reduzate molecule is larger, the SEI film internal resistances of formation are higher.
With the increase of additive level, capability retention is gradually stepped up (embodiment 10,3,11,12)；When additive mass content reaches 4%, capability retention but has to be declined to a certain degree.When the content of additive is relatively low (as being less than 0.2%w.t.), the SEI films of formation are sufficiently complete, it is impossible to sufficiently cover negative terminal surface；And during the too high levels of addition, thicker SEI films can be formed, cause inside battery interface impedance to increase, influence capacity and the circulation of battery；Therefore the used in amounts of additive will find an equalization point.Succinic anhydride derivative content is in the range of 1%~2%, and the high temperature cyclic performance of battery is preferable；Battery using 2- methyl-maleic anhydride (a), 3- oxabicyclos [3.1.0]-two kinds of additives of hexamethylene -2,4- diketone (c) has similar rule.VC is combined with succinic anhydride derivative additive, and the high temperature cyclic performance of battery is more preferably.
In summary, the present invention can obviously improve cobalt acid lithium, the high temperature circulation of ternary material battery and storge quality using succinic anhydride derivative, maleic anhydride derivative as lithium-ion battery electrolytes additive.
According to set forth above, the technical staff of professional domain of the present invention can make appropriate change and modification to above-described embodiment；The invention is not limited in the specific embodiment of foregoing description, some modifications and changes that the present invention is done should also be belonged to the scope of the claims of the present invention.
Finally it should be noted that：It the foregoing is only the preferred embodiments of the present invention, it is not intended to limit the invention, although the present invention is described in detail with reference to the foregoing embodiments, for a person skilled in the art, it can still modify to the technical scheme described in foregoing embodiments, or carry out equivalent to which part technical characteristic.Within the spirit and principles of the invention, any modifications, equivalent substitutions and improvements made etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of improve the electrolyte of performance of lithium ion battery, it is characterised in that the lithium-ion battery electrolytes are made up of electrolyte solute, solvent and additive, wherein, additive includes succinic anhydride, maleic anhydride derivative and conventional additives.
2. electrolyte according to claim 1, it is characterised in that one or more of the conventional additives in ethylene carbonate VC, fluorinated ethylene carbonate FEC, ethylene carbonate vinylene VEC；The succinic anhydride, maleic anhydride derivative are selected from 2- methyl-maleic anhydride, 2, the fluoro- maleic anhydrides of 3- bis-, 3- oxabicyclos [3.1.0]-hexamethylene -2, one or more in 4- diketone, 2,2- dimethyl-succinic anhydride, tetrabydrophthalic anhydride.
3. electrolyte according to claim 1 or 2, it is characterised in that the succinic anhydride, the content of maleic anhydride derivative account for the ratio of electrolyte gross mass in the range of 0.01%-8% (w.t.).
4. electrolyte according to claim 1 or 2, it is characterised in that the additive level accounts for the ratio of electrolyte gross mass in the range of 0.1%-10% (w.t.).
5. electrolyte according to claim 1 or 2, it is characterised in that the ratio that the succinic anhydride, the content of maleic anhydride derivative account for electrolyte gross mass is controlled at 0.2-4% (w.t.).
6. electrolyte according to claim 1 or 2, it is characterised in that the electrolyte solute includes LiPF6、LiBF4, LiBOB, LiTFSI one or more therein.
7. electrolyte according to claim 1 or 2, characterized in that, solvent for use includes the one or more in ethylene carbonate EC, propene carbonate PC, butylene BC, dimethyl carbonate DMC, methyl ethyl carbonate EMC, diethyl carbonate DEC, methyl propyl carbonate MPC, gamma butyrolactone GBL.
8. a kind of lithium ion battery, barrier film including positive pole, negative pole and between positive pole and negative pole, it is characterised in that take the electrolyte of any described improvement performance of lithium ion battery of claim 1~7, wherein, the material of the lithium ion cell positive includes LiNixCoyMn1-x-yO2 (the ＜ y ＜ 1 of 0 ＜ x ＜ 1,0) or LiCoO2, the material of the negative pole of lithium ion battery includes Delanium.
9. lithium ion battery according to claim 8, it is characterised in that the material of the lithium ion cell positive is specially：LiNi0.33Mn0.33Co0.33O2, acetylene black, polyvinylidene fluoride PVDF, mass ratio is 94: 3: 3.
10. lithium ion battery according to claim 8 or claim 9, it is characterised in that the specific material of material of the negative pole of the lithium ion battery is Delanium, acetylene black, sodium carboxymethylcellulose CMC, styrene butadiene rubber sbr, and mass ratio is 94: 1.5: 2: 2.5.
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| CN109037778A (en) * | 2018-08-01 | 2018-12-18 | 桑德集团有限公司 | A kind of electrolysis additive and electrolyte, lithium ion battery and equipment containing it |
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| CN106463776A (en) * | 2014-06-23 | 2017-02-22 | 日本电气株式会社 | Nonaqueous electrolytic solution and secondary cell |
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| CN108110318A (en) * | 2016-11-25 | 2018-06-01 | 深圳新宙邦科技股份有限公司 | A kind of nonaqueous electrolytic solution and lithium ion battery for lithium ion battery |
| CN107066722B (en) * | 2017-04-06 | 2020-07-07 | 北京理工大学 | Electrochemical model-based combined estimation method for state of charge and state of health of power battery system |
| CN107066722A (en) * | 2017-04-06 | 2017-08-18 | 北京理工大学 | A kind of combined estimation method of electrokinetic cell system state-of-charge and health status based on electrochemical model |
| CN107887647B (en) * | 2017-10-26 | 2020-08-11 | 广州天赐高新材料股份有限公司 | Electrolyte for 5V high-voltage lithium secondary battery and lithium secondary battery containing electrolyte |
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| CN108461808A (en) * | 2018-03-21 | 2018-08-28 | 上海力信能源科技有限责任公司 | A kind of lithium ion battery of high-energy density and preparation method thereof |
| CN109037778A (en) * | 2018-08-01 | 2018-12-18 | 桑德集团有限公司 | A kind of electrolysis additive and electrolyte, lithium ion battery and equipment containing it |
| CN109687021A (en) * | 2018-12-18 | 2019-04-26 | 东莞市杉杉电池材料有限公司 | A kind of high temp resistance lithium ion cell nonaqueous electrolytic solution |
| CN110845458A (en) * | 2019-10-15 | 2020-02-28 | 湖南博信新能源科技有限公司 | Maleic anhydride, lithium battery electrolyte and lithium ion battery |
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