CN105529494A - Non-aqueous electrolyte and lithium ion battery - Google Patents
Non-aqueous electrolyte and lithium ion battery Download PDFInfo
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- CN105529494A CN105529494A CN201410515864.7A CN201410515864A CN105529494A CN 105529494 A CN105529494 A CN 105529494A CN 201410515864 A CN201410515864 A CN 201410515864A CN 105529494 A CN105529494 A CN 105529494A
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Abstract
The invention provides a non-aqueous electrolyte and a lithium ion battery. The nonaqueous electrolytic solution includes: a lithium salt; a non-aqueous organic solvent; and an additive. The additive comprises: lithium tetrafluoroborate (LiBF)4) (ii) a And one or more compounds with the structure of formula I; in formula I, R1、R2、R3Independently selected from one of aliphatic alkyl group having 1 to 5 carbon atoms, phenyl group and alkylbenzene having alkyl group having 1 to 3 carbon atoms as a substituent. The lithium ion battery comprises the nonaqueous electrolyte. The lithium ion battery provided by the invention has excellent high-temperature storage performance, cycle performance and rate capability.
Description
Technical field
The present invention relates to cell art, particularly relate to a kind of nonaqueous electrolytic solution and lithium ion battery.
Background technology
Lithium ion battery has that energy density is high, operating voltage is high, self-discharge rate is low, has extended cycle life, unique advantage such as pollution-free, is now widely used in the electronic product such as camera, mobile phone as power supply.In recent years, along with the fast development of smart electronics product, the flying power of lithium ion battery is had higher requirement.In order to improve the energy density of lithium ion battery, exploitation high-voltage lithium ion batteries is one of effective ways, and at present, operating voltage has become the focus of numerous R&D institution and business research at the lithium ion battery of more than 4.35V.But under high voltages, positive pole oxidation activity uprises, nonaqueous electrolytic solution is easily at positive electrode surface generation electrochemical oxidation reactions, and then decompose generation gas, simultaneously, can be there is reduction reaction and stripping in positive pole transition metal (as nickel, cobalt, manganese etc.), thus cause the chemical property of lithium ion battery to worsen and then cause losing efficacy.Visible, overcome the Important Problems that nonaqueous electrolytic solution is exploitation high-voltage lithium ion batteries in the oxidation Decomposition of positive electrode surface.
Summary of the invention
In view of Problems existing in background technology, the object of the present invention is to provide a kind of nonaqueous electrolytic solution and lithium ion battery, described lithium ion battery has excellent high-temperature storage performance, cycle performance and high rate performance.
To achieve these goals, in a first aspect of the present invention, the invention provides a kind of nonaqueous electrolytic solution, comprising: lithium salts; Non-aqueous organic solvent; And additive.Described additive comprises: LiBF4 (LiBF
4); And one or more having in the compound of structure shown in formula I;
In formula I, R
1, R
2, R
3independently selected from having the aliphatic alkyl of 1-5 carbon atom, phenyl and with the one in the alkyl benzene of the alkyl of 1-3 carbon atom alternatively base.
In a second aspect of the present invention, the invention provides a kind of lithium ion battery, comprising: positive plate, comprise plus plate current-collecting body and to be arranged on plus plate current-collecting body and to comprise the positive pole diaphragm of positive electrode active materials; Negative plate, comprises negative current collector and to be arranged on negative current collector and to comprise the cathode membrane of negative active core-shell material; Barrier film, is interval between positive plate and negative plate; Nonaqueous electrolytic solution; And package foil.Wherein, described nonaqueous electrolytic solution is nonaqueous electrolytic solution according to a first aspect of the present invention.
Relative to prior art, beneficial effect of the present invention is:
Add LiBF in nonaqueous electrolytic solution of the present invention simultaneously
4with the compound with formula I structure, on the one hand, the compound with formula I structure can produce complexing with the transition metal in positive electrode active materials and form stable bidentate chelation structure, thus the redox reaction that can reduce between positive electrode active materials and nonaqueous electrolytic solution, reduce the stripping of transition metal in positive electrode active materials, improve the stability of positive electrode active materials, and then effectively improve high-temperature storage performance and the cycle performance of lithium ion battery; On the other hand, LiBF
4low ESR film can be generated at surface of positive electrode active material, thus significantly reduce the impedance of positive electrode surface electrochemical reaction, make the high-temperature storage performance of lithium ion battery and cycle performance improved while, the high rate performance of lithium ion battery can not be worsened.
Embodiment
The following detailed description of nonaqueous electrolytic solution according to the present invention and lithium ion battery and comparative example, embodiment and test result.
First nonaqueous electrolytic solution is according to a first aspect of the present invention described.
Nonaqueous electrolytic solution according to a first aspect of the present invention, comprising: lithium salts; Non-aqueous organic solvent; And additive.Described additive comprises: LiBF4 (LiBF
4); And one or more having in the compound of structure shown in formula I;
In formula I, R
1, R
2, R
3independently selected from having the aliphatic alkyl of 1-5 carbon atom, phenyl and with the one in the alkyl benzene of the alkyl of 1-3 carbon atom alternatively base.
In nonaqueous electrolytic solution described according to a first aspect of the present invention, add the compound with structure shown in formula I, can effectively to prevent under high voltage nonaqueous electrolytic solution in the oxidation Decomposition of surface of positive electrode active material, thus the transition metal generation reduction reaction improved in positive electrode active materials and then cause the problem of stripping, improve the stability of positive electrode active materials, and then effectively improve high-temperature storage performance and the cycle performance of lithium ion battery.This due to: (1) is positioned at strand two ends-CN can form bidentate chelation structure with transition metal, and this bidentate chelation structure has better stability than monodentate chelation structure; (2) be positioned at-O-in the middle of strand also can with transition metal generation complexing, thus strengthen the stability of chelation structure further; (3)-the O-be positioned in the middle of strand has electron attraction, and this electron attraction can make the R between two-O-
2on electron cloud offset to-O-, and-CN has the stronger electron attraction of ratio-O-, thus the electron cloud be displaced near-O-can be made to offset to-CN further, cloud density around final increase-CN, and strengthen-CN and the complexing of transition metal further, namely strengthen the stability of chelation structure; (4) the small volume of-O-in the middle of strand is positioned at, sterically hindered less to the complexing of-CN and transition metal that are positioned at strand two ends, thus enhance the complexing of-CN and transition metal to a certain extent, if namely arrange the larger electron withdraw group replacement-O-of volume in the middle of strand, then it can produce larger sterically hindered effect to the complexing of-CN and transition metal that are positioned at strand two ends, finally causes chelation structure to become unstable.
In addition, if the strand with the compound of structure shown in formula I is too short, then-O-between the-CN at strand two ends can the complexing between p-CN and transition metal produce larger sterically hindered, thus is unfavorable for the chelation structure that formation is stable; If the strand with the compound of structure shown in formula I is long, then be positioned at the hypertelorism of the middle-O-of strand and transition metal, the complexing between-O-and transition metal can be weakened, and strand is long, the fusing point with the compound of structure shown in formula I raises, cause the viscosity of nonaqueous electrolytic solution to increase, be unfavorable for forming homogeneous nonaqueous electrolytic solution, and then also can affect the performance of lithium ion battery.
In nonaqueous electrolytic solution described according to a first aspect of the present invention, add appropriate LiBF
4, be conducive to the impedance of the electrochemical reaction reducing positive electrode surface, thus improve the dynamic performance of lithium ion battery.
In nonaqueous electrolytic solution described according to a first aspect of the present invention, add LiBF simultaneously
4with the compound with formula I structure, on the one hand, the compound with formula I structure can produce complexing with transition metal in positive electrode active materials and form stable bidentate chelation structure, thus the redox reaction that can reduce between positive electrode active materials and nonaqueous electrolytic solution, reduce the stripping of transition metal in positive electrode active materials, improve the stability of positive electrode active materials, and then effectively improve high-temperature storage performance and the cycle performance of lithium ion battery; On the other hand, LiBF
4low ESR film can be generated at surface of positive electrode active material, thus significantly reduce the impedance of positive electrode surface electrochemical reaction, make the high-temperature storage performance of lithium ion battery and cycle performance improved while, the high rate performance of lithium ion battery can not be worsened.
In nonaqueous electrolytic solution described according to a first aspect of the present invention, described in there is structure shown in formula I compound can be selected from the compound with formula 1 structure, the compound with formula 2 structure and have in the compound of formula 3 structure one or more;
In nonaqueous electrolytic solution described according to a first aspect of the present invention, described LiBF
4mass fraction in nonaqueous electrolytic solution can be 0.01% ~ 0.5%.Work as LiBF
4mass fraction in nonaqueous electrolytic solution lower than 0.01% time, it is not obvious to the improvement result of positive pole; Work as LiBF
4mass fraction in nonaqueous electrolytic solution higher than 0.5% time, too much LiBF
4again can passivation negative pole, make the dynamic performance of lithium ion battery be deteriorated on the contrary.
In nonaqueous electrolytic solution described according to a first aspect of the present invention, described in there is formula I structure the mass fraction of compound in nonaqueous electrolytic solution can be 0.1% ~ 5%.When the mass fraction of the compound with formula I structure in nonaqueous electrolytic solution lower than 0.1% time, the chelation structure that transition metal in itself and positive electrode active materials is formed is fine and close not, effectively cannot suppress the redox reaction between nonaqueous electrolytic solution and positive electrode active materials, thus high-temperature storage performance and the cycle performance of lithium ion battery cannot be improved; When the mass fraction of the compound with formula 1 structure in nonaqueous electrolytic solution higher than 5% time, the complexing layer that the transition metal in itself and positive electrode active materials is formed is blocked up, causes the dynamic performance of lithium ion battery to be obviously deteriorated.
In nonaqueous electrolytic solution described according to a first aspect of the present invention, described lithium salts can be selected from LiPF
6, LiClO
4, LiAsF
6, LiN (CF
3sO
2)
2, LiCF
3sO
3and one or more in LiBOB.
In nonaqueous electrolytic solution described according to a first aspect of the present invention, described non-aqueous organic solvent can be selected from one or more in ethylene carbonate (EC), propene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), gamma-butyrolacton (BL), methyl formate (MF), Ethyl formate (MA), ethyl propionate (EP), propyl propionate (PP) and oxolane (THF).
Secondly lithium ion battery is according to a second aspect of the present invention described.
Lithium ion battery according to a second aspect of the present invention, comprising: positive plate, comprises plus plate current-collecting body and to be arranged on plus plate current-collecting body and to comprise the positive pole diaphragm of positive electrode active materials; Negative plate, comprises negative current collector and to be arranged on negative current collector and to comprise the cathode membrane of negative active core-shell material; Barrier film, is interval between positive plate and negative plate; Nonaqueous electrolytic solution; And package foil.Wherein, described nonaqueous electrolytic solution is nonaqueous electrolytic solution according to a first aspect of the present invention.
In lithium ion battery described according to a second aspect of the present invention, the end of charge voltage of described lithium ion battery can be 4.35V ~ 5V.
In lithium ion battery described according to a second aspect of the present invention, described positive electrode active materials can be selected from cobalt acid lithium, lithium-nickel-manganese-cobalt ternary material or the mixture of the two.
In lithium ion battery described according to a second aspect of the present invention, described negative active core-shell material can be selected from graphite, silicon or the mixture of the two.
Following explanation is according to the comparative example of nonaqueous electrolytic solution of the present invention and lithium ion battery and embodiment.
Comparative example 1
(1) preparation of nonaqueous electrolytic solution
In drying shed, EC:PC:DEC=1:1:1 takes non-aqueous organic solvent and mixes in mass ratio, adds LiPF afterwards
6liPF is made as lithium salts
6concentration be 1mol/L, obtain nonaqueous electrolytic solution.
(2) preparation of positive plate
Take 1.42kg Solvents N-methyl-2-Pyrrolidone (NMP), 1.2kg mass fraction be 10% binding agent polyvinylidene fluoride (PVDF), 0.16kg conductive agent electrically conductive graphite and 7.2kg positive electrode active materials LiCoO
2abundant mix and blend obtains anode sizing agent, and afterwards anode sizing agent being coated on equably thickness is on the plus plate current-collecting body aluminium foil of 16 μm, obtains positive pole diaphragm afterwards at 120 DEG C of baking 1h, afterwards through overcompaction, cut and obtain positive plate.
(3) preparation of negative plate
Take 1.2kg mass fraction be 1.5% thickener sodium carboxymethylcellulose (CMC) solution, 0.07kg mass fraction be 50% binding agent SBR emulsion, the abundant mix and blend of 2.4kg negative active core-shell material powdered graphite obtain cathode size, afterwards cathode size being coated on equably thickness is on the negative current collector Copper Foil of 12 μm, obtain cathode membrane at 120 DEG C of baking 1h afterwards, afterwards through overcompaction, cut and obtain negative plate.
(4) preparation of lithium ion battery
Be that the polypropylene barrier film of 12 μm is separated and is wound into square naked battery core by above-mentioned positive plate, negative plate thickness, load aluminum foil sack afterwards, after 80 DEG C of bakings dewater, inject nonaqueous electrolytic solution, seal, change into, be vented and test capacity obtains the lithium ion battery of finished product.
Comparative example 2
Method according to comparative example 1 prepares lithium ion battery, except following difference:
(1) in nonaqueous electrolytic solution, also contain additive, described additive is the mass fraction in nonaqueous electrolytic solution is the LiBF of 0.2%
4.
Comparative example 3
Method according to comparative example 1 prepares lithium ion battery, except following difference:
(1) in nonaqueous electrolytic solution also containing additive, described additive to be the mass fraction in nonaqueous electrolytic solution be 1.5% the compound with formula 1 structure.
Comparative example 4
Method according to comparative example 1 prepares lithium ion battery, except following difference:
(1) in nonaqueous electrolytic solution, also contain additive, described additive is the mass fraction in nonaqueous electrolytic solution is the LiBF of 0.6%
4with the compound with formula 1 structure that the mass fraction in nonaqueous electrolytic solution is 1.5%.
Comparative example 5
Method according to comparative example 1 prepares lithium ion battery, except following difference:
(1) in nonaqueous electrolytic solution, also contain additive, described additive is the mass fraction in nonaqueous electrolytic solution is the LiBF of 0.2%
4with the compound with formula 1 structure that the mass fraction in nonaqueous electrolytic solution is 6%.
Comparative example 6
Method according to comparative example 1 prepares lithium ion battery, except following difference:
(1) in nonaqueous electrolytic solution, also contain additive, described additive is the mass fraction in nonaqueous electrolytic solution is the LiBF of 0.6%
4with the compound with formula 1 structure that the mass fraction in nonaqueous electrolytic solution is 6%.
Embodiment 1
Method according to comparative example 1 prepares lithium ion battery, except following difference:
(1) in nonaqueous electrolytic solution, also contain additive, described additive is the mass fraction in nonaqueous electrolytic solution is the LiBF of 0.2%
4with the compound with formula 1 structure that the mass fraction in nonaqueous electrolytic solution is 0.2%.
Embodiment 2
Method according to comparative example 1 prepares lithium ion battery, except following difference:
(1) in nonaqueous electrolytic solution, also contain additive, described additive is the mass fraction in nonaqueous electrolytic solution is the LiBF of 0.2%
4with the compound with formula 1 structure that the mass fraction in nonaqueous electrolytic solution is 0.5%.
Embodiment 3
Method according to comparative example 1 prepares lithium ion battery, except following difference:
(1) in nonaqueous electrolytic solution, also contain additive, described additive is the mass fraction in nonaqueous electrolytic solution is the LiBF of 0.2%
4with the compound with formula 1 structure that the mass fraction in nonaqueous electrolytic solution is 1.5%.
Embodiment 4
Method according to comparative example 1 prepares lithium ion battery, except following difference:
(1) in nonaqueous electrolytic solution, also contain additive, described additive is the mass fraction in nonaqueous electrolytic solution is the LiBF of 0.2%
4with the compound with formula 1 structure that the mass fraction in nonaqueous electrolytic solution is 3%.
Embodiment 5
Method according to comparative example 1 prepares lithium ion battery, except following difference:
(1) in nonaqueous electrolytic solution, also contain additive, described additive is the mass fraction in nonaqueous electrolytic solution is the LiBF of 0.2%
4with the compound with formula 1 structure that the mass fraction in nonaqueous electrolytic solution is 5%.
Embodiment 6
Method according to comparative example 1 prepares lithium ion battery, except following difference:
(1) in nonaqueous electrolytic solution, also contain additive, described additive is the mass fraction in nonaqueous electrolytic solution is the LiBF of 0.05%
4with the compound with formula 1 structure that the mass fraction in nonaqueous electrolytic solution is 1.5%.
Embodiment 7
Method according to comparative example 1 prepares lithium ion battery, except following difference:
(1) in nonaqueous electrolytic solution, also contain additive, described additive is the mass fraction in nonaqueous electrolytic solution is the LiBF of 0.1%
4with the compound with formula 1 structure that the mass fraction in nonaqueous electrolytic solution is 1.5%.
Embodiment 8
Method according to comparative example 1 prepares lithium ion battery, except following difference:
(1) in nonaqueous electrolytic solution, also contain additive, described additive is the mass fraction in nonaqueous electrolytic solution is the LiBF of 0.3%
4with the compound with formula 1 structure that the mass fraction in nonaqueous electrolytic solution is 1.5%.
Embodiment 9
Method according to comparative example 1 prepares lithium ion battery, except following difference:
(1) in nonaqueous electrolytic solution, also contain additive, described additive is the mass fraction in nonaqueous electrolytic solution is the LiBF of 0.5%
4with the compound with formula 1 structure that the mass fraction in nonaqueous electrolytic solution is 1.5%.
Embodiment 10
Method according to comparative example 1 prepares lithium ion battery, except following difference:
(1) in nonaqueous electrolytic solution, also contain additive, described additive is the mass fraction in nonaqueous electrolytic solution is the LiBF of 0.2%
4with the compound with formula 2 structure that the mass fraction in nonaqueous electrolytic solution is 1.5%.
Embodiment 11
Method according to comparative example 1 prepares lithium ion battery, except following difference:
(1) in nonaqueous electrolytic solution, also contain additive, described additive is the mass fraction in nonaqueous electrolytic solution is the LiBF of 0.2%
4with the compound with formula 3 structure that the mass fraction in nonaqueous electrolytic solution is 1.5%.
Finally provide performance test process and the test result of comparative example 1-6 and embodiment 1-11.
(1) high-temperature storage performance of lithium ion battery test
At 25 DEG C, with 0.5C multiplying power constant current charge to 4.4V, under 4.4V, constant voltage charge, to 0.05C, is tested the thickness of lithium ion battery and is designated as h afterwards
0; Afterwards lithium ion battery is put into the insulating box of 70 DEG C, be incubated 20 days, and tested the thickness of lithium ion battery every 5 days and be designated as h
n, n is the number of days that high-temperature lithium ion battery stores.
High-temperature lithium ion battery stores thickness swelling (%)=(h after n days
n-h
0)/h
0× 100%.
(2) the cycle performance test of lithium ion battery
At 25 DEG C, lithium ion battery is left standstill 30 minutes, afterwards with 0.5C multiplying power constant current charge to 4.4V, afterwards under 4.4V constant voltage charge to 0.05C, and leave standstill 5 minutes, afterwards with 0.5C multiplying power constant-current discharge to 3.0V, this is a charge and discharge cycles process, this discharge capacity is the discharge capacity first of lithium ion battery, carries out 200 charge and discharge cycles processes afterwards.
Discharge capacity/discharge capacity × 100% first of capability retention (the %)=the N time circulation after lithium ion battery N circulation.
(3) the high rate performance test of lithium ion battery
At 25 DEG C, lithium ion battery is left standstill 30 minutes, afterwards with 0.5C multiplying power constant current charge to 4.4V, afterwards under 4.4V constant voltage charge to 0.05C, and leave standstill 5 minutes, afterwards lithium ion battery is discharged to 3.0V with different multiplying (0.2C, 0.5C, 1.0C, 1.5C, 2.0C) respectively, after each electric discharge terminates, leave standstill 5 minutes again, the discharge capacity of record lithium ion battery.With discharge capacity during 0.2C multiplying power discharging for benchmark, obtain the discharge capacity ratio of lithium ion battery under different discharge-rate.
Discharge capacity × 100% under discharge capacity/0.2C multiplying power under discharge capacity ratio (%) under lithium ion battery different multiplying=different multiplying (0.5C, 1.0C, 1.5C, 2.0C).
Table 1 provides parameter and the performance test results of comparative example 1-6 and embodiment 1-11.
Next the performance test results of lithium ion battery is analyzed.
As can be seen from the contrast of comparative example 1-2, in the nonaqueous electrolytic solution of lithium ion battery, only add LiBF
4the high-temperature storage performance of lithium ion battery and high rate performance be all significantly improved, but the cycle performance of lithium ion battery is still poor.As can be seen from the contrast of comparative example 1 and comparative example 3, in the nonaqueous electrolytic solution of lithium ion battery, only add the lithium ion battery of the compound with formula I structure high-temperature storage performance and cycle performance are all significantly improved, but the high rate performance of lithium ion battery is still poor.And as can be seen from the contrast of embodiment 1-11 and comparative example 1-3, in the nonaqueous electrolytic solution of lithium ion battery, add LiBF simultaneously
4with the lithium ion battery of the compound with formula I structure, there is excellent high-temperature storage performance, cycle performance and high rate performance simultaneously.This is because: on the one hand, the compound with formula I structure can produce complexing with the transition metal in positive electrode active materials and form stable bidentate chelation structure, thus the redox reaction that can reduce between positive electrode active materials and nonaqueous electrolytic solution, reduce the stripping of transition metal in positive electrode active materials, improve the stability of positive electrode active materials, and then effectively improve high-temperature storage performance and the cycle performance of lithium ion battery; On the other hand, LiBF
4low ESR film can be generated at surface of positive electrode active material, thus significantly reduce the impedance of positive electrode surface electrochemical reaction, make the high-temperature storage performance of lithium ion battery and cycle performance improved while, the high rate performance of lithium ion battery can not be worsened.
As can be seen from the contrast of embodiment 1-5, the mass fraction of compound in nonaqueous electrolytic solution with formula I structure is higher, see on the whole, thickness swelling after high-temperature lithium ion battery stores is lower, capability retention after lithium ion battery repeatedly circulates first increases rear small size reduction, discharge capacity ratio under lithium ion battery different multiplying reduces, but still higher than comparative example 1.But when having the mass fraction of compound in nonaqueous electrolytic solution too high (comparative example 5) of formula I structure, the cycle performance of lithium ion battery and high rate performance worsen.
As can be seen from the contrast of embodiment 3 and embodiment 6-9, LiBF
4in nonaqueous electrolytic solution, mass fraction is higher, see on the whole, thickness swelling after high-temperature lithium ion battery stores is lower, capability retention after lithium ion battery repeatedly circulates first increases rear small size reduction, discharge capacity under lithium ion battery different multiplying slightly reduces after first increasing, but still higher than comparative example 1.But work as LiBF
4mass fraction in nonaqueous electrolytic solution too high (comparative example 4), cycle performance and the high rate performance of lithium ion battery obviously worsen, and high-temperature storage performance of lithium ion battery also starts to be deteriorated.Also similar phenomenon can be seen from the contrast of comparative example 5-6.
In sum, in nonaqueous electrolytic solution, add LiBF simultaneously
4lithium ion battery can be made to have excellent high-temperature storage performance, cycle performance and high rate performance with the compound with formula I structure simultaneously.
Claims (10)
1. a nonaqueous electrolytic solution, comprising:
Lithium salts;
Non-aqueous organic solvent; And
Additive;
It is characterized in that,
Described additive comprises:
LiBF4 (LiBF
4); And
There are one or more in the compound of structure shown in formula I;
In formula I, R
1, R
2, R
3independently selected from having the aliphatic alkyl of 1-5 carbon atom, phenyl and with the one in the alkyl benzene of the alkyl of 1-3 carbon atom alternatively base.
2. nonaqueous electrolytic solution according to claim 1, is characterized in that, described in there is structure shown in formula I compound be selected from the compound with formula 1 structure, the compound with formula 2 structure and have in the compound of formula 3 structure one or more;
3. nonaqueous electrolytic solution according to claim 1, is characterized in that, described LiBF
4mass fraction in nonaqueous electrolytic solution is 0.01% ~ 0.5%.
4. nonaqueous electrolytic solution according to claim 1, is characterized in that, described in there is formula I structure the mass fraction of compound in nonaqueous electrolytic solution be 0.1% ~ 5%.
5. nonaqueous electrolytic solution according to claim 1, is characterized in that, described lithium salts is selected from LiPF
6, LiClO
4, LiAsF
6, LiN (CF
3sO
2)
2, LiCF
3sO
3and one or more in LiBOB.
6. nonaqueous electrolytic solution according to claim 1, it is characterized in that, described non-aqueous organic solvent is selected from one or more in ethylene carbonate (EC), propene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), gamma-butyrolacton (BL), methyl formate (MF), Ethyl formate (MA), ethyl propionate (EP), propyl propionate (PP) and oxolane (THF).
7. a lithium ion battery, comprising:
Positive plate, comprises plus plate current-collecting body and to be arranged on plus plate current-collecting body and to comprise the positive pole diaphragm of positive electrode active materials;
Negative plate, comprises negative current collector and to be arranged on negative current collector and to comprise the cathode membrane of negative active core-shell material;
Barrier film, is interval between positive plate and negative plate;
Nonaqueous electrolytic solution; And
Package foil;
It is characterized in that,
Described nonaqueous electrolytic solution is the nonaqueous electrolytic solution according to any one of claim 1-6.
8. lithium ion battery according to claim 7, is characterized in that, the end of charge voltage of described lithium ion battery is 4.35V ~ 5V.
9. lithium ion battery according to claim 7, is characterized in that, described positive electrode active materials is selected from cobalt acid lithium, lithium-nickel-manganese-cobalt ternary material or the mixture of the two.
10. lithium ion battery according to claim 7, is characterized in that, described negative active core-shell material is selected from graphite, silicon or the mixture of the two.
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Effective date of registration: 20191218 Address after: 213300 No. 1000 North Avenue, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province Patentee after: CONTEMPORARY AMPEREX TECHNOLOGY Ltd. (JIANGSU) Address before: 352100, Xingang Road, Ningde Town, Jiaocheng District, Fujian, 1 Patentee before: Contemporary Amperex Technology Co.,Ltd. |