CN110931865A - Novel additive-containing electrolyte for lithium ion battery and lithium ion battery - Google Patents

Novel additive-containing electrolyte for lithium ion battery and lithium ion battery Download PDF

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CN110931865A
CN110931865A CN201911138065.1A CN201911138065A CN110931865A CN 110931865 A CN110931865 A CN 110931865A CN 201911138065 A CN201911138065 A CN 201911138065A CN 110931865 A CN110931865 A CN 110931865A
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electrolyte
lithium ion
ion battery
lithium
novel additive
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黄秋洁
毛冲
朱孟
欧霜辉
白晶
于智力
万广聪
戴晓兵
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Zhuhai Smoothway Electronic Materials Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

The electrolyte for the lithium ion battery and the lithium ion battery, which are provided by the invention, can effectively improve the cycle performance, the storage performance and the safety performance of the lithium ion battery and contain the novel additive. The electrolyte comprises an electrolyte main body and a silicon-containing diimidazole compound; the lithium ion battery comprises a positive plate, a negative plate, a diaphragm and the electrolyte; when the silicon-containing diimidazole compound is used as an electrolyte additive, an interface film with excellent electrochemical stability and ionic conductivity can be formed on the interface of a positive electrode material and a negative electrode material of a lithium ion battery; meanwhile, the additive has a structure of Si-N bond and can react with H2Inhibition of LiPF by O/HF reaction6And H2And the O reaction reduces the content of HF, improves the storage stability and the thermal stability of the electrolyte, and improves the high-temperature cycle performance of the battery. The inventionThe method is used in the field of lithium ion batteries.

Description

Novel additive-containing electrolyte for lithium ion battery and lithium ion battery
Technical Field
The invention relates to the field of lithium ion batteries, in particular to electrolyte for a lithium ion battery containing a novel additive and the lithium ion battery.
Background
In order to adapt to the rapid development of power automobiles, energy storage devices and digital electronic devices, the energy density of lithium ion batteries is urgently needed to be further improved, and one of the improvement methods is to use a ternary high-voltage high-nickel material. The nickel content in the material is high, the oxidation activity to electrolyte is strong, and the battery made of the material has the problems of poor high-temperature storage and high-temperature circulation. The current common solution is to find a novel positive and negative film-forming additive to improve the interface condition of the positive and negative electrodes of the lithium ion battery, thereby improving the high-temperature storage and high-temperature cycle performance of the battery.
Chinese application publication No. CN 110085913a discloses "lithium ion battery electrolyte suitable for high nickel positive electrode material and silicon carbon negative electrode material and its preparation method", and the document introduces a combination of N, N-sulfuryl diimidazole SDI, fluoroethylene carbonate and tris (trimethylsilane) phosphite TMSPi to improve the high temperature storage performance and normal temperature cycle performance of the battery. The invention indicates that in the first charge-discharge process of the lithium ion battery, the N, N-sulfuryl diimidazole SDI and the fluoroethylene carbonate FEC can form a good SEI film on the surface of a negative electrode, so that the capacity, the cycle performance and the high-temperature storage performance of the battery are improved. Meanwhile, a layer of compact CEI film can be formed on the surface of the positive electrode by the aid of the N, N-sulfuryl diimidazole SDI and the tris (trimethylsilane) phosphite TMSPi, so that dissolution of transition metals in the positive electrode material is prevented, and the cycle stability of the positive electrode material is improved. However, such additive combinations have poor high temperature cycling performance.
In order to solve the technical problems, the invention improves the high-temperature cycle performance and the high-temperature storage performance of the lithium ion battery by adding the silicon-containing diimidazole compound into the electrolyte.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the electrolyte for the lithium ion battery, which can effectively improve the cycle performance, the storage performance and the safety performance of the lithium ion battery and contains the novel additive.
The invention also provides a lithium ion battery containing the electrolyte, and the lithium ion battery has excellent cycle performance, storage performance and safety performance.
The technical scheme adopted by the electrolyte containing the novel additive for the lithium ion battery is as follows: the electrolyte comprises an electrolyte main body and a novel additive, wherein the novel additive is a silicon-containing diimidazole compound shown as the following structural formula,
Figure 100002_DEST_PATH_IMAGE001
，
in the structural formula, R1 and R2 are respectively and independently selected from halogen atoms, nitrogen atom-containing groups or groups containing 1-9 carbon atoms, and R3-R9 are respectively and independently selected from hydrogen atoms or groups containing 1-9 carbon atoms.
Further, the group containing 1-9 carbon atoms is selected from one or more of alkyl, oxygen-containing alkyl, halogenated alkyl, cyano or aromatic group.
Preferably, the novel additive is, but not limited to, a combination of one or more of the following compounds:
Figure 58254DEST_PATH_IMAGE002
Figure 100002_DEST_PATH_IMAGE003
Figure 100002_DEST_PATH_IMAGE004
。
furthermore, the novel additive accounts for 0.1-5% of the total mass of the lithium ion battery electrolyte.
In addition, the electrolyte body includes an organic solvent, a lithium salt, and conventional additives.
Specifically, the organic solvent includes, but is not limited to, one or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, 1, 3-dioxolane, r-butyrolactone, propyl acetate, propyl propionate.
The lithium salt includes, but is not limited to, LiPF6、LiBF4、LiBOB、LiDFOB、LiFAP、LiAsF6、LiSbF6、LiCF3SO3、LiN(SO2CF3)2、LiN(SO2C2F5)2、LiN(SO2CF3)2、LiN(SO2C4F9)2、LiC(SO2CF3)3、LiPF2(C2O4)2、LiPF4(C2O4)、LiB(CF3)4Or LiBF3(C2F5) One or more of (a).
The conventional additives include, but are not limited to, one or more of vinylene carbonate, 1, 3-propane sultone, 1, 4-butane sultone, acrylic lactone, ethylene carbonate, fluoroethylene carbonate, lithium difluorophosphate, methylene methanedisulfonate, ethylene sulfate, lithium difluorophosphate, lithium tetrafluoroborate, lithium difluorooxalato borate, lithium difluorosulfonimide, lithium bis (trifluoromethylsulfonyl) imide.
The invention can achieve the technical effects that: compared with the prior art, the electrolyte for the lithium ion battery takes the silicon-containing diimidazole compound as a novel additive, a reduction reaction is carried out on the negative electrode of the battery in the formation process, reaction products participate in forming a compact and stable passive film, namely a Solid Electrolyte Interface (SEI) film, and the SEI film has excellent electrochemical stability and ionic conductivity and can reduce side reactions of the electrolyte and the electrode; at the same time, the novel additiveThe additive can also be complexed and coordinated with metal ions through silicon atoms on the surface of the battery anode, and a layer of stable anode electrolyte interface (CEI) film is formed on the surface of the anode active material, so that the catalytic oxidation decomposition of anode transition metal on the electrolyte is inhibited; in addition, under high voltage, the novel additive can be decomposed to generate silicon free radicals, and oxygen free radicals generated by decomposition of the positive electrode material are captured to a certain extent, so that the high-voltage resistance of the battery is improved. Therefore, the electrolyte using the silicon-containing diimidazole compound as a novel additive can effectively improve the cycle performance, the storage performance and the service life of the lithium ion battery. Meanwhile, the additive has a structure of Si-N bond and can react with H2Inhibition of LiPF by O/HF reaction6And H2And the O reaction reduces the content of HF, improves the storage stability and the thermal stability of the electrolyte, and improves the high-temperature cycle performance of the battery.
The lithium ion battery added with the novel additive also comprises a positive plate, a negative plate and a diaphragm.
Therefore, in the formation process of the battery, the novel additive performs a reduction reaction on the negative electrode of the battery, and the reaction product participates in the formation of a compact and stable passive film, namely a Solid Electrolyte Interface (SEI) film, wherein the SEI film has excellent electrochemical stability and ionic conductivity and can reduce the side reaction of the electrolyte and the electrode; meanwhile, the novel additive can also form a stable anode electrolyte interface (CEI) film on the surface of the anode active material through complexation and coordination of silicon atoms and metal ions on the surface of the battery anode, so that the catalytic oxidation decomposition of anode transition metal on the electrolyte is inhibited; in addition, under high voltage, the novel additive can be decomposed to generate silicon free radicals, and oxygen free radicals generated by decomposition of the positive electrode material are captured to a certain extent, so that the high-voltage resistance of the battery is improved. Therefore, the electrolyte using the silicon-containing diimidazole compound as a novel additive can effectively improve the cycle performance, the storage performance and the service life of the lithium ion battery.
Detailed Description
In the present invention, the electrolyte includes an electrolyte body and a novel additive. The electrolyte body comprises an organic solvent, a lithium salt and conventional additives. The novel additive accounts for 0.1-5% of the total mass of the electrolyte. The structure of the added novel additive is as follows:
Figure 214210DEST_PATH_IMAGE001
。
specifically, it may be a combination of one or more of the following compounds:
Figure 384160DEST_PATH_IMAGE002
Figure 809063DEST_PATH_IMAGE003
Figure 13648DEST_PATH_IMAGE004
。
wherein, the compound 1 is prepared by adopting imidazole and dichlorodimethylsilane to carry out substitution reaction under the action of an acid-binding agent and then carrying out recrystallization or column chromatography purification. The synthetic route is as follows:
Figure DEST_PATH_IMAGE005
。
the compound 2 is prepared by performing substitution reaction on 2-methyl-benzimidazole and dichlorodimethylsilane under the action of an acid-binding agent and performing recrystallization or column chromatography purification. The synthetic route is as follows:
Figure DEST_PATH_IMAGE006
。
the compound 3 is prepared by performing substitution reaction on 4-methylimidazole and dichlorodimethylsilane under the action of an acid-binding agent and performing recrystallization or column chromatography purification. The synthetic route is as follows:
Figure DEST_PATH_IMAGE007
。
the compound 4 is prepared by carrying out substitution reaction on methyl silicon trichloride and imidazole under the action of an acid-binding agent and then carrying out recrystallization or column chromatography purification. The synthetic route is as follows:
Figure DEST_PATH_IMAGE008
。
the compound 5 is prepared by carrying out substitution reaction on methyl silicon trichloride and 2-methylimidazole under the action of an acid-binding agent and then carrying out recrystallization or column chromatography purification. The synthetic route is as follows:
Figure DEST_PATH_IMAGE009
。
the compound 6 is prepared by carrying out substitution reaction on methyl silicon trichloride and 4-methylimidazole under the action of an acid-binding agent and then carrying out recrystallization or column chromatography purification. The synthetic route is as follows:
Figure DEST_PATH_IMAGE010
。
the compound 7 is prepared by performing substitution reaction on phenyl silicon trichloride and imidazole under the action of an acid-binding agent, and then performing recrystallization or column chromatography purification. The synthetic route is as follows:
Figure DEST_PATH_IMAGE011
。
the compound 8 is prepared by the substitution reaction of methyl silicon trichloride and imidazole under the action of an acid-binding agent, and then is reacted with F2、N2After the mixed gas is fluorinated, the fluorine-containing compound is finally prepared by recrystallization or column chromatography purification. The synthetic route is as follows:
Figure DEST_PATH_IMAGE012
。
the compound 9 is prepared by performing substitution reaction on silicon tetrachloride and diisopropylamine under the action of a catalyst, then reacting with imidazole at 0 ℃, and finally performing recrystallization or column chromatography purification. The synthetic route is as follows:
Figure DEST_PATH_IMAGE013
。
the organic solvent in the electrolyte includes, but is not limited to, one or more of Ethylene Carbonate (EC), Propylene Carbonate (PC), dimethyl carbonate (DMC), Ethyl Methyl Carbonate (EMC), diethyl carbonate (DEC), 1, 3-Dioxolane (DOL), r-butyrolactone (GBL), Propyl Acetate (PA), Propyl Propionate (PP). In the embodiment of the present invention, the organic solvent is specifically a mixed solution of Ethylene Carbonate (EC), Ethyl Methyl Carbonate (EMC), and diethyl carbonate (DEC), and the mass ratio of the organic solvent to the mixed solution is 1: 1: 1.
the lithium salt includes, but is not limited to, LiPF6、LiBF4、LiBOB、LiDFOB、LiFAP、LiAsF6、LiSbF6、LiCF3SO3、LiN(SO2CF3)2、LiN(SO2C2F5)2、LiN(SO2CF3)2、LiN(SO2C4F9)2、LiC(SO2CF3)3、LiPF2(C2O4)2、LiPF4(C2O4)、LiB(CF3)4Or LiBF3(C2F5) One or more of (a). Specifically, the lithium salt is preferably LiPF6And LiPF6And the mixture of the lithium salt and other lithium salts, wherein the concentration of the lithium salt in the lithium ion battery electrolyte is 0.5-2.0 mol/L.
The conventional additives include organic small molecule additives and lithium salt type additives for forming a solid electrolyte interfacial film. Wherein the organic small molecule additive comprises but is not limited to Vinylene Carbonate (VC), 1, 3-Propane Sultone (PS), 1, 4-Butane Sultone (BS), acrylic acid lactone (RPS), ethylene carbonate (VEC), fluoro ethylene carbonateOne or more of esters (FEC), Methylene Methanedisulfonate (MMDS), vinyl sulfate (DTD); lithium salt type additives include, but are not limited to, lithium difluorosilicate (LiF)2PO2) Lithium tetrafluoroborate (LiBF)4) Lithium difluorooxalato borate (LiODFB), lithium bis (fluorosulfonylimide) (LiFSI), lithium bis (trifluoromethylsulfonyl) imide (LiTFSI).
Preferably, the conventional additive comprises one or more organic small molecule additives selected from FEC, VC and PS, and the addition amount accounts for 0.1-5% of the mass percent of the nonaqueous electrolyte; the lithium salt additive is LiPO2F2One or more of LiODFB and LiFSI, which account for 0.1 to 5 percent of the electrolyte by mass percent respectively.
In addition, the lithium ion battery provided by the invention comprises the electrolyte for the lithium ion battery containing the novel additive, and further comprises a positive plate, a negative plate and a diaphragm. Specifically, the positive electrode sheet includes a current collector and a positive active material layer on the current collector. The specific kind of the positive electrode active material is not particularly limited and may be selected as desired. The positive electrode active material may include a composite oxide containing lithium and at least one element selected from cobalt, manganese, and nickel. More specifically, the positive active material may be selected from lithium cobaltate (LiCoO)2) Lithium nickel manganese cobalt ternary material and lithium manganate (LiMn)2O4) Lithium nickel manganese oxide (LiNi)0.5Mn1.5O4) Lithium iron silicate (LiFePO)4) One or more of them. The negative electrode tab includes a current collector and a negative active material layer on the current collector. The specific kind of the negative electrode active material is also not particularly limited and may be selected as desired. More specifically, the negative active material may be selected from natural graphite, artificial graphite, mesophase micro carbon spheres (abbreviated as MCMB), hard carbon, soft carbon, silicon-carbon composite, Li-Sn alloy, Li-Sn-O alloy, Sn, SnO2、Li4Ti5O12One or more of them.
The present invention will be described in detail with reference to specific examples.
Example 1
This example is used to illustrate the electrolyte for lithium ion batteries and the preparation method thereof disclosed in the present invention.
(1) Preparing an electrolyte:
preparing electrolyte in a vacuum glove box with the water content of less than 1ppm under the argon atmosphere, wherein the organic solvent is ethylene carbonate/ethyl methyl carbonate/diethyl carbonate =1/1/1 (mass ratio), and LiPF6The concentration of the lithium salt is 1.1mol/L, the content of VC is 1 percent of the total weight of the electrolyte, the content of PS is 2 percent of the total weight of the electrolyte, the content of LiFSI is 1 percent of the total weight of the electrolyte, 1 percent of silicon-containing imidazole compound, namely compound 1, is added, and the mixture is uniformly mixed to obtain the lithium ion electrolyte.
(2) Preparing a positive pole piece: mixing Li [ Ni ]0.5Mn0.2Co0.3]O2: uniformly mixing PVDF (polyvinylidene fluoride) SP =95:1:4 with 1-methyl-2-pyrrolidone, coating the mixed slurry on two sides of an aluminum foil, drying and rolling to obtain the positive pole piece.
(3) Preparing a negative pole piece: mixing graphite: SP: CMC: and dissolving SBR =95:1.5:1.0:2.5 in an aqueous solution, uniformly mixing, coating the mixed slurry on two sides of a copper foil, drying and rolling to obtain the negative pole piece.
(4) Preparing a lithium ion battery: and (3) preparing the positive pole piece, the negative pole piece and the diaphragm prepared in the steps (1) to (3) into a battery cell in a lamination mode, packaging by adopting a polymer, filling the prepared electrolyte, and preparing the lithium ion battery with the capacity of 2300mAh through working procedures of formation, capacity grading and the like.
(5) And (3) testing the performance of the lithium ion battery:
and (3) high-temperature storage test: firstly, the batteries with the classified capacity are charged and discharged once at the normal temperature by 1C, then the batteries are fully charged by 1C, and then the batteries are stored for 7d at the high temperature of 70 ℃, and then the batteries are taken out for 1C discharge.
High-temperature cycle test: the battery is subjected to charge-discharge cycle test at 45 ℃ and 1C/1C for 400 weeks, and the cut-off voltage interval is 3.0-4.4V.
Examples 2 to 9 and comparative examples 1 to 3:
the specific test methods of examples 2 to 9 and comparative examples 1 to 3 were the same as in example 1, except that: in examples 2 to 9 and comparative examples 1 to 3, in the preparation step of the electrolyte, the components in mass percentage shown in table 1 were added to the electrolyte. Similarly, the weight percent of the components added in example 1 are also shown in Table 1 for comparison. The test results of examples 1 to 9 and comparative examples 1 to 3 are shown in Table 2.
TABLE 1 electrolyte composition of examples and comparative examples
Principal solvent Additive agent Lithium salt
Example 1 EC:EMC:DEC=1:1:1 VC 1%, PS 2%, LiFSI 1%, compound 11% 1.1mol/L
Example 2 EC:EMC:DEC=1:1:1 VC 1%, PS 2%, LiFSI 1%, compound 21% 1.1mol/L
Example 3 EC:EMC:DEC=1:1:1 VC 1%, PS 2%, LiFSI 1%, and 31% 1.1mol/L
Example 4 EC:EMC:DEC=1:1:1 VC 1%, PS 2%, LiFSI 1%, and compound 41% 1.1mol/L
Example 5 EC:EMC:DEC=1:1:1 VC 1%, PS 2%, LiFSI 1%, and 51% of compound 1.1mol/L
Example 6 EC:EMC:DEC=1:1:1 VC 1%, PS 2%, LiFSI 1%, and 61% 1.1mol/L
Example 7 EC:EMC:DEC=1:1:1 VC 1%, PS 2%, LiFSI 1%, and 71% of compound 1.1mol/L
Example 8 EC:EMC:DEC=1:1:1 VC 1%, PS 2%, LiFSI 1%, and 81% of compound 1.1mol/L
Example 9 EC:EMC:DEC=1:1:1 VC 1%, PS 2%, LiFSI 1%, and 91% of compound 1.1mol/L
Comparative example 1 EC:EMC:DEC=1:1:1 VC 1%;PS 2%;LiFSI 1% 1.1mol/L
Comparative example 2 EC:EMC:DEC=1:1:1 VC 2%;LiFSI 1% 1.1mol/L
Comparative example 3 EC:EMC:DEC=1:1:1 PS 2%;LiFSI 1% 1.1mol/L
TABLE 2 test results
Figure DEST_PATH_IMAGE015
The test results of the comparative examples 1 to 9 and the comparative examples 1 to 3 show that the high-temperature cycle performance and the high-temperature storage performance of the lithium ion battery can be remarkably improved by adding the novel silicon-containing diimidazole compound shown in the structural formula 1 into the non-aqueous electrolyte to combine with VC, PS and LiFSI.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those of ordinary skill in the art can readily practice the present invention as described herein; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.

Claims (9)

1. The electrolyte for the lithium ion battery containing the novel additive comprises an electrolyte main body and is characterized in that: it also comprises a novel additive, the novel additive is a silicon-containing diimidazole compound shown in the following structural formula,
Figure DEST_PATH_IMAGE001
，
in the structural formula, R1 and R2 are respectively and independently selected from halogen atoms, nitrogen atom-containing groups or groups containing 1-9 carbon atoms, and R3-R9 are respectively and independently selected from hydrogen atoms or groups containing 1-9 carbon atoms.
2. The electrolyte for a lithium ion battery containing a novel additive according to claim 1, wherein: the group containing 1-9 carbon atoms is selected from one or more of alkyl, oxygen-containing alkyl, halogenated alkyl, cyano or aromatic group.
3. The electrolyte for lithium ion batteries containing the novel additive according to claim 1 or 2, wherein the novel additive is but not limited to one or more of the following compounds in combination:
Figure DEST_PATH_IMAGE002
Figure DEST_PATH_IMAGE003
Figure DEST_PATH_IMAGE004
。
4. the electrolyte for a lithium ion battery containing a novel additive according to claim 1, wherein: the novel additive accounts for 0.1-5% of the total mass of the lithium ion battery electrolyte.
5. The electrolyte for a lithium ion battery containing a novel additive according to claim 1, wherein: the electrolyte body comprises an organic solvent, a lithium salt and conventional additives.
6. The electrolyte for a lithium ion battery containing a novel additive according to claim 5, wherein: the organic solvent includes, but is not limited to, one or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, 1, 3-dioxolane, r-butyrolactone, propyl acetate, propyl propionate.
7. The electrolyte for a lithium ion battery containing a novel additive according to claim 5, wherein: the lithium salt includes, but is not limited to, LiPF6、LiBF4、LiBOB、LiDFOB、LiFAP、LiAsF6、LiSbF6、LiCF3SO3、LiN(SO2CF3)2、LiN(SO2C2F5)2、LiN(SO2CF3)2、LiN(SO2C4F9)2、LiC(SO2CF3)3、LiPF2(C2O4)2、LiPF4(C2O4)、LiB(CF3)4Or LiBF3(C2F5) One or more of (a).
8. The electrolyte for a lithium ion battery containing a novel additive according to claim 5, wherein: the conventional additives include, but are not limited to, one or more of vinylene carbonate, 1, 3-propane sultone, 1, 4-butane sultone, acrylic lactone, ethylene carbonate, fluoroethylene carbonate, lithium difluorophosphate, methylene methanedisulfonate, ethylene sulfate, lithium difluorophosphate, lithium tetrafluoroborate, lithium difluorooxalato borate, lithium difluorosulfonimide, lithium bis (trifluoromethylsulfonyl) imide.
9. A lithium ion battery comprising the electrolyte for lithium ion battery containing the novel additive according to claim 1, wherein: it also comprises a positive plate, a negative plate and a diaphragm.
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CN111416153A (en) * 2020-05-22 2020-07-14 松山湖材料实验室 Silicon-cyanogen electrolyte additive of high-voltage lithium ion battery, electrolyte and battery thereof
CN111900477A (en) * 2020-08-04 2020-11-06 松山湖材料实验室 High-voltage lithium ion battery electrolyte film-forming additive, electrolyte and battery thereof
CN112467214A (en) * 2020-11-30 2021-03-09 远景动力技术(江苏)有限公司 Electrolyte solution and lithium ion battery using same
CN112467214B (en) * 2020-11-30 2022-03-01 远景动力技术(江苏)有限公司 Electrolyte solution and lithium ion battery using same
CN113839094A (en) * 2021-09-17 2021-12-24 宁德新能源科技有限公司 Electrolyte solution, electrochemical device comprising the same, and electronic device
CN114069044A (en) * 2021-10-27 2022-02-18 珠海冠宇电池股份有限公司 Anode material and lithium ion battery containing same
CN114156541A (en) * 2021-12-27 2022-03-08 珠海市赛纬电子材料股份有限公司 Electrolyte additive, electrolyte containing additive and lithium ion battery
CN114614088A (en) * 2022-01-10 2022-06-10 天津大学 Capacity compensation type electrolyte additive, preparation method and application thereof, and electrolyte and secondary battery containing additive
CN114614088B (en) * 2022-01-10 2024-05-07 天津储翕科技有限公司 Capacity compensation type electrolyte additive, preparation method and application thereof, and electrolyte and secondary battery containing additive
CN114464883A (en) * 2022-01-13 2022-05-10 珠海冠宇电池股份有限公司 High-voltage electrolyte and battery containing same
CN114464883B (en) * 2022-01-13 2023-06-30 珠海冠宇电池股份有限公司 High-voltage electrolyte and battery containing same

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