Lithium ion battery

Abstract

The invention provides a lithium ion battery. The lithium ion battery comprises a positive electrode material, a negative electrode material and an electrolyte. The positive electrode material comprises a positive electrode active material and an inorganic lithium supplement agent, and the electrolyte comprises electrolyte salt, a non-aqueous organic solvent and an additive. The additive comprises a compound A as shown in a structural formula I or a structural formula II. Wherein R1 is selected from trifluoromethylsulfonyl or trifluoromethylsulfinyl, R2 is (CH2) n, and n is an integer from 1 to 3. The electrolyte of the lithium ion battery contains a specific additive, so that a high-quality solid electrolyte membrane (SEI) and a positive electrode solid electrolyte interface membrane (CEI) can be formed, the gas production of a lithium supplement agent is relieved, the dissolution of metal ions is inhibited, and the high-temperature cycle performance and the storage stability of the lithium ion battery can be efficiently improved. Structural formula I and structural formula II

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of new energy, and particularly relates to a lithium ion battery. BACKGROUND

[0002] In order to cope with the realistic demand for higher energy density and reduce the initial active lithium loss of the lithium ion battery, a lithium supplement agent emerges as the times require in the lithium ion battery. However, in harsh application scenarios such as tropical, desert areas, high-power fast charging and vehicle high-temperature working conditions, the short board of the existing electrolyte additive system of the lithium ion battery in the aspects of high-temperature interface stability, oxidation decomposition resistance and lithium ion transmission kinetics is gradually exposed, which seriously restricts the high-temperature cycle life and safety of the lithium ion battery. At the same time, although the introduction of the lithium supplement agent improves the initial active lithium of the lithium ion battery, increases the energy density and improves the long cycle performance, a large amount of oxygen is generated in the lithium release process of the lithium supplement agent such as lithium-rich lithium iron oxide (Li5FeO4), which causes the electrolyte to be oxidized and decomposed, and deteriorates the storage performance and gas generation performance of the lithium ion battery.

[0003] The current mainstream high-temperature additive (such as lithium difluorophosphate (LiPO2F2), 1,3-propanesulfonic acid lactone (PST), vinyl sulfate (DTD) and the like) builds a solid electrolyte interface (SEI / CEI film) on the electrode surface through sacrificial decomposition, but it still has technical bottlenecks. For example, the SEI film generated by the traditional high-temperature additive is mainly composed of inorganic components (such as LiF, Li2CO3), and the crystal particles are coarsened at high temperature (> 60℃), which causes the porosity of the film layer to increase sharply. Although the additive system containing DTD can improve the room temperature cycle performance, the LiF phase in the SEI film is heterogeneous agglomeration after high-temperature storage, which causes the electrolyte to be continuously decomposed and the metal ions to be dissolved out, and accelerates the capacity attenuation.

[0004] Therefore, it is urgent to develop a new type of electrolyte additive which has high-temperature film forming stability, oxidation decomposition resistance, low impedance characteristics and can relieve oxygen release of the lithium supplement agent, so as to realize high capacity retention rate, low swelling characteristics and long cycle charging compatibility of the lithium ion battery in the high-temperature scene. SUMMARY

[0005] Based on the above problems, the application provides a lithium ion battery, which contains a specific additive in the electrolyte of the lithium ion battery. The additive can form a high-quality solid electrolyte film (SEI) and a positive electrode solid electrolyte interface film (CEI), so as to relieve the oxygen generation of the lithium supplement agent, inhibit the dissolution of the metal ions, and efficiently improve the high-temperature cycle performance and storage stability of the lithium ion battery.

[0006] To achieve the above object, the present application provides a lithium ion battery, comprising a positive electrode material, a negative electrode material and an electrolyte. The positive electrode material comprises a positive electrode active material and an inorganic lithium supplement agent, and the electrolyte comprises an electrolyte salt, a non-aqueous organic solvent and an additive. The additive comprises a compound A as shown in structural formula I or structural formula II. Wherein, R1 is selected from trifluoromethylsulfonyl or trifluoromethylsulfenyl, R2 is (CH2) n , and n is an integer from 1 to 3.

[0007]

[0008] Structural formula I Structural formula II The additive in the non-aqueous electrolyte of the present application comprises a compound A as shown in structural formula I or structural formula II, and the compound A has a N-trifluoromethylsulfonyl pyrrolone or N-trifluoromethylsulfenyl pyrrolone structure. When the compound A is applied to a lithium ion battery, the trifluoromethylsulfonyl group or trifluoromethylsulfenyl group in the compound A molecule is easy to be removed and to occur reduction decomposition on the surface of the negative electrode, forming a dense inorganic SEI rich in LiF, Li2S, Li2N and the like, so as to improve the negative electrode electrolyte interface, improve the migration efficiency of lithium ions and reduce the interface impedance. At the same time, the N-trifluoromethylsulfonyl or N-trifluoromethylsulfenyl reacts with the positive electrode lithium supplement agent, and provides a strong electron-withdrawing effect through the -SO2-N- or -SO-N- structure, so as to reduce the covalence of the M-O bond (M is metal) in the positive electrode lithium supplement agent, and reduce the oxygen vacancy formation energy barrier. Although the electron-withdrawing ability of the -SO2-N- or -SO-N- structure is weak, a more flexible surface layer can be formed, buffering the lattice oxygen escape and reducing the lattice oxygen oxidation (O 2- → O2↑) at high potential, and inhibiting oxygen release. In addition, the trifluoromethylsulfonyl group or trifluoromethylsulfenyl group is preferentially oxidized to form a dense CEI film, isolating the electrolyte from the surface of the lithium supplement agent, reducing the electrolyte oxidation gas (such as CO2), and reducing the chain side reaction triggered by oxygen release. Moreover, the N atom on the pyrrolone has a higher electronegativity under the influence of the adjacent carbonyl group, can have a weak coordination with metal ions, regulate the spatial structure of metal ions, inhibit the dissolution behavior of metal ions, and at the same time generate an inorganic SEI component with smaller impedance. Therefore, the use of the compound A in the lithium ion battery can form high-quality solid-state electrolyte film (SEI) and positive electrode solid electrolyte interface film (CEI), relieve the gas production of the lithium supplement agent, inhibit the dissolution of metal ions, and efficiently improve the high-temperature cycle performance and storage stability of the lithium ion battery.

[0009] As a technical solution of the present application, n is 1 or 2.

[0010] As a technical solution of the present application, the compound A is selected from at least one of compound one to compound three.

[0011]

[0012] Compound one Compound two Compound three As a technical scheme of the present application, the mass percentage of the compound A is 0.05-5.00%, based on the sum of the mass of the electrolyte salt, the non-aqueous organic solvent and the additive being 100%.

[0013] As a technical scheme of the present application, the additive further comprises vinylene carbonate, and the mass percentage of the vinylene carbonate is 0.50-4.50%, based on the sum of the mass of the electrolyte salt, the non-aqueous organic solvent and the additive being 100%.

[0014] As a technical scheme of the present application, the electrolyte salt is selected from at least one of lithium hexafluorophosphate, lithium perchlorate, lithium tetrafluoroborate, lithium trifluoromethylsulfonate, lithium bis-trifluoromethylsulfonimide, lithium bis-oxalato-borate, lithium difluorophosphate, lithium bis-oxalate-borate, lithium difluoro-oxalate-borate, lithium lower aliphatic carboxylate, lithium difluoro-bis-oxalate-phosphate and lithium bis-fluorosulfonimide.

[0015] As a technical scheme of the present application, the non-aqueous organic solvent is selected from at least one of γ-butyrolactone, γ-valerolactone, δ-valerolactone, methyl acetate, ethyl acetate, ethyl propionate, butyl acetate, propyl propionate, butyl propionate, ethylene carbonate, propylene carbonate, butylene carbonate, methyl-pentyl carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, methyl propyl carbonate, propylene carbonate, 1,3-dioxolane, 1,4-dioxane, crown ether, tetrahydrofuran, 2-methyltetrahydrofuran, 2-trifluoromethyltetrahydrofuran, dimethoxymethane, diethoxymethane, ethoxymethoxymethane, ethylene glycol di-n-propyl ether, ethylene glycol di-n-butyl ether and diethylene glycol dimethyl ether.

[0016] As a technical scheme of the present application, the positive electrode active material is selected from at least one of lithium iron phosphate-based material, lithium cobaltate-based material, lithium nickel cobalt manganese oxide-based material or lithium nickel cobalt aluminate-based material.

[0017] As a technical scheme of the present application, the inorganic lithium supplement agent is selected from Li2O, Li2C2O4, Li2NiO2 or Li5FeO4.

[0018] As a technical scheme of the present application, the negative electrode material comprises a negative electrode active material selected from at least one of artificial graphite, natural graphite, soft carbon, hard carbon, lithium titanate, silicon-carbon composite material and silicon-oxygen composite material. DETAILED DESCRIPTION

[0019] The lithium ion battery of the present application comprises a positive electrode material, a negative electrode material and an electrolyte.

[0020] The positive electrode material comprises a positive electrode active material and an inorganic lithium supplementing agent. The positive electrode active material comprises at least one of a metal oxide and a polyanion compound. Specifically, the metal oxide is selected from at least one of a lithium iron phosphate material, a lithium cobaltate material, a lithium nickel cobalt manganese oxide material or a lithium nickel cobalt aluminate material. The lithium iron phosphate material is lithium iron phosphate or doped and coated modified lithium iron phosphate. The lithium cobaltate material is lithium cobaltate or doped and coated modified lithium cobaltate. The lithium nickel cobalt manganese oxide material has a chemical formula of LiNi x Co y Mn z M (1-x-y-z) O2, and the lithium nickel cobalt aluminate material has a chemical formula of LiNi x Co y Mn z N (1-x-y-z) O2, wherein M is at least one of Mg, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V and Ti, N is at least one of Mn, Mg, Cu, Zn, Sn, B, Ga, Cr, Sr, V and Ti, 0 x R y (XO z ) n , wherein R is independently selected from at least one of Fe, Mn, Ni, Cu and V, X is independently selected from one of S, P, Si, Mo and As, 1≤x≤4, 1≤y≤3, 1≤n≤3, 1≤z≤4. The inorganic lithium supplementing agent is selected from lithium oxide (Li2O), lithium oxalate (Li2C2O4), lithium nickelate (Li2NiO2), lithium-rich lithium ferrite (Li5FeO4) and the like. By way of example, the positive electrode active material of the present application can be a lithium iron phosphate material having a chemical formula of LiFePO4, and the inorganic lithium supplementing agent is lithium-rich lithium ferrite (Li5FeO4). In addition to the positive electrode active material and the inorganic lithium supplementing agent, the positive electrode material can further comprise a binder, a conductive agent and the like. The binder and the conductive agent can be conventional positive electrode binders or conductive agents, which are not the key to the present application and will not be described here.

[0021] The negative electrode material comprises a negative electrode active material selected from at least one of artificial graphite, natural graphite, soft carbon, hard carbon, lithium titanate, silicon-carbon composite material and silicon-oxygen composite material. The negative electrode active material can use only one of the above, or two or more of the above can be used in combination. In addition to the negative electrode active material, the negative electrode material can further comprise a binder, a conductive agent and the like, and the binder and the conductive agent can be conventional negative electrode binders or conductive agents, which are not the key to the present application and will not be described here.

[0022] The electrolyte includes an electrolyte salt, a non-aqueous organic solvent, and an additive.

[0023] The electrolyte salt accounts for 5-25% of the total mass of the electrolyte salt, the non-aqueous organic solvent, and the additive. Further, the electrolyte salt accounts for 8-20% of the total mass of the electrolyte salt, the non-aqueous organic solvent, and the additive. Still further, the electrolyte salt accounts for 10-15% of the total mass of the electrolyte salt, the non-aqueous organic solvent, and the additive. As an example, the electrolyte salt can account for, but is not limited to, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, or 25% of the total mass of the electrolyte salt, the non-aqueous organic solvent, and the additive. The electrolyte salt is selected from at least one of lithium hexafluorophosphate (LiPF6), lithium perchlorate (LiClO4), lithium tetrafluoroborate (LiBF4), lithium trifluoromethylsulfonate (LiCF3SO3), lithium bis(trifluoromethylsulfonyl)imide (LiTFSI), lithium bis(oxalato)borate (LiBOB), lithium difluorophosphate (LiPO2F2), lithium bis(oxalato)borate (LiBOB), lithium difluoro(oxalato)borate (LiDFOB), lithium lower aliphatic carboxylate, lithium difluorophosphate (LiDFBP), and lithium bis(fluorosulfonyl)imide (LiFSI). As an example, the lithium salt is lithium hexafluorophosphate (LiPF6), but is not limited thereto.

[0024] The non-aqueous organic solvent has a mass ratio of 65-90%, further, the non-aqueous organic solvent has a mass ratio of 77-89%, and further, the non-aqueous organic solvent has a mass ratio of 78-88%. As an example, the mass ratio of the non-aqueous organic solvent can be, but is not limited to, 65%, 67%, 69%, 70%, 72%, 74%, 75%, 77%, 79%, 80%, 81%, 84%, 85%, 88%, 89%, 90%. The non-aqueous organic solvent is selected from at least one of lactone, chain carbonate, cyclic carbonate, chain carboxylate, cyclic carboxylate and ether cyclic compound. Further, the non-aqueous organic solvent is selected from at least one of γ-butyrolactone (GBL), γ-valerolactone (GVL), δ-valerolactone (DVL), methyl acetate (MA), ethyl acetate (EA), ethyl propionate (EP), butyl acetate (BAC), propyl propionate (PP), butyl propionate (PRB), ethylene carbonate (EC), propylene carbonate (PCA), butylene carbonate (BC), methyl propyl carbonate (MPC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), methyl propyl carbonate (MPC), propylene carbonate (PC), 1,3-dioxolane (DOL), 1,4-dioxane (DX), crown ether, tetrahydrofuran (THF), 2-methyltetrahydrofuran (2-CH3-THF), 2-trifluoromethyltetrahydrofuran (2-CF3-THF), dimethoxymethane (DMM), diethoxymethane (DEM), ethoxymethoxymethane (DCE), ethylene glycol di-n-propyl ether (EDP), ethylene glycol di-n-butyl ether (EDB) and diethylene glycol dimethyl ether (DEGME).

[0025] The additive includes compound A as shown in structural formula I or structural formula II. Wherein, R1 is selected from trifluoromethylsulfonyl or trifluoromethylsulfinyl, R2 is (CH2)n, and n is an integer of 1-3. Further, n is 1 or 2. As an example, R2 is methylene, ethylene or propylene. n , n is an integer of 1-3. Further, n is 1 or 2. As an example, R2 is methylene, ethylene or propylene.

[0026]

[0027] Structural formula I Structural formula II Further, the compound A is selected from at least one of compound one to compound three.

[0028]

[0029] Compound one Compound two Compound three CAS:52322-84-6 CAS:569337-23-1 CAS:871983-19-6 The mass percentage of compound A is 0.05-5.00%, preferably, the mass percentage of compound A is 0.10%-4.00%. More preferably, the mass percentage of compound A is 0.50-2.00%. As an example, the mass percentage of compound A can be, but is not limited to, 0.05%, 0.10%, 0.20%, 0.30%, 0.40%, 0.50%, 0.60%, 0.70%, 0.80%, 0.90%, 1.00%, 1.50%, 2.00%, 2.50%, 3.00%, 3.50%, 4.00%, 4.50%, 5.00%, but is not limited to the listed values, and other unlisted values within the range are also applicable.

[0030] The additive also includes vinylene carbonate (VC), and the mass percentage of vinylene carbonate is 0.50-4.50%. Preferably, the mass percentage of vinylene carbonate is 1.00%-4.00%. More preferably, the mass percentage of vinylene carbonate is 1.50-3.00%. As an example, the mass percentage of vinylene carbonate can be, but is not limited to, 0.50%, 1.00%, 1.50%, 2.00%, 2.50%, 3.00%, 3.50%, 4.00%, 4.50%, but is not limited to the listed values, and other unlisted values within the range are also applicable.

[0031] To better illustrate the purpose, technical scheme and beneficial effects of the present application, the purpose, technical scheme and beneficial effects of the present application are further illustrated by specific examples below, but do not constitute any limitation on the present application. If no specific conditions are indicated in the examples, the conventional conditions or the conditions recommended by the manufacturer can be used. If no manufacturer of the reagent or instrument is indicated, it is a conventional product that can be obtained from the market.

[0032] Example 1 (1) Preparation of non-aqueous electrolyte In an argon-filled glove box (O2<1 ppm, H2O<1 ppm), vinyl carbonate (EC), methyl ethyl carbonate (EMC) were mixed in a weight ratio of EC:EMC=3:7 (87.0 g), then 0.5 g of compound one was added, dissolved and stirred thoroughly, then 12.5 g of LiPF6 was added, and the non-aqueous electrolyte was obtained after mixing uniformly.

[0033] (2) Preparation of positive electrode Lithium phosphate material LiFePO4, inorganic lithium supplement Li5FeO4, adhesive PVDF and conductive agent SuperP were mixed in a mass ratio of 93:2:1:4 to prepare a lithium secondary battery positive electrode slurry with a certain viscosity. After coating the mixed slurry on both sides of the aluminum foil, drying and rolling, a positive electrode sheet was obtained.

[0034] (3) Preparation of negative electrode The negative electrode graphite material, the binder PVDF and the conductive agent Super P were mixed in a mass ratio of 90:2:8 to prepare a lithium secondary battery negative electrode slurry with a certain viscosity. After the mixed slurry was coated on both sides of a copper foil, drying and rolling were performed to obtain a negative electrode sheet.

[0035] (4) Preparation of lithium ion battery The positive electrode sheet, the separator and the negative electrode sheet were stacked in order, and then stacked as needed. After the tab was welded, it was placed in an aluminum plastic film battery outer package. The above prepared non-aqueous electrolyte was injected into the dried bare cell, and then vacuum packaging, standing, formation (0.05C constant current charging to 3.0V, and then 0.1C constant current charging to 3.3V), shaping, capacity test and other processes were performed in sequence, and finally a 1 Ah soft package lithium secondary battery was obtained.

[0036] The formulations of the non-aqueous electrolytes of Examples 1-13 and Comparative Examples 1-3 are shown in Table 1, wherein the preparation of the electrolytes and the steps of preparing the batteries of Examples 2-13 and Comparative Examples 1-3 are the same as those of Example 1.

[0037] Table 1 Formulations of non-aqueous electrolytes of various examples and comparative examples

[0038] The lithium ion batteries prepared in Examples 1-13 and Comparative Examples 1-2 were subjected to high-temperature fast-charging cycle tests, high-temperature storage tests and internal resistance growth rate tests, respectively. The specific test conditions are as follows, and the performance test results are shown in Table 2.

[0039] (1) High-temperature storage capacity retention rate performance test The lithium ion battery was charged at 1C constant current to a voltage of 3.65V at a constant temperature of 25℃, and then charged at 3.65V constant voltage to a current of 0.05C. Then, it was discharged at 1C constant current to a voltage of 2.5V, and the first cycle discharge capacity of the battery was recorded as C0. The initial volume of the battery was recorded as V0. Then, the lithium ion battery was placed in a 60℃ constant temperature oven and allowed to stand for 30 min, so that the lithium ion battery reached a constant temperature. Then, after storage at 60℃ for 15d, the battery was discharged at 1C / 1C constant current and constant voltage to 2.5V at a constant temperature of 25℃. The discharge capacity was recorded as C1, and the volume of the battery was recorded as V1. Then, the lithium ion battery was again charged at 1C constant current to a voltage of 3.65V at a constant temperature of 25℃, and then charged at 3.65V constant voltage to a current of 0.05C. After 15d of storage at 60℃, the battery was discharged at 1C / 1C constant current and constant voltage to 2.5V at a constant temperature of 25℃. The discharge capacity was recorded as C2, and the volume of the battery was recorded as V2. The capacity retention rates of the lithium ion battery after 15d and 30d of storage were calculated using the following formula, respectively.

[0040] Storage 15d capacity retention rate = (C1 / C0) x 100% Storage 30d capacity retention rate = (C2 / C0) x 100% Storage 30d volume growth rate = (V2-V0) / V0 x 100% (2) High temperature cycle performance test The lithium ion battery was placed in a 45℃ constant temperature oven, and rested for 30 min, so that the lithium ion battery reached constant temperature, and then charged at 4C constant current to 3.65V, and then charged at 3.65V constant voltage to 0.05C, and then discharged at 4C constant current to 2.5V, and the first cycle discharge capacity of the battery was recorded as C0, and the initial volume of the battery was recorded as V0, which was one charge and discharge cycle. Then 1C / 1C charging and discharging were carried out at 45℃ for 1000 cycles, and the discharge capacity was recorded as C1, and the volume of the battery was recorded as V1, and the capacity retention rate and volume growth rate of the lithium ion battery were calculated using the following formula.

[0041] Capacity retention rate = (C1 / C0) x 100% Volume growth rate = (V1-V0) / V0 x 100% Table 2 lithium ion battery performance test results of examples 1-13 and comparative examples 1-3

[0042] From the results of Table 2, the addition of compound A to the lithium ion battery containing the lithium supplementing agent can effectively improve the high temperature cycle performance and storage stability of the lithium ion battery. Further, the addition of VC on the basis of compound A can further improve the high temperature cycle performance and storage stability, because the addition of VC alone can improve the high temperature storage retention rate of the lithium ion battery, reduce the volume growth, and at the same time slightly improve the cycle performance, but due to the relatively dense SEI formed by the reduction of VC at the graphite negative electrode, a layer of polycarbonate film forming material is formed, which has a large impedance at high temperature, so the high temperature performance is effectively improved, and the addition of compound A can overcome this problem. The compound can preferentially form a dense inorganic SEI at the negative electrode to improve the ion conductivity and electronic conductivity of the electrolyte interface, inhibit the reduction reaction of VC at the graphite layer, reduce the impedance, reduce the consumption of VC during the cycle process, and effectively improve the long cycle performance.

[0043] From the comparison of examples 1-3, it can be seen that the battery performance of compound two is the best, and the sulfinyl group can more effectively alleviate the crystal structure distortion of inorganic lithium supplementing agent Li5FeO4 during the decomposition in the cycle process, effectively release the lattice strain force, improve the long cycle performance of the battery, and more effectively control the oxygen release behavior of Li5FeO4.

[0044] From Comparative Example 2 and Examples 4-7, it can be seen that the content of compound A should not be too low, otherwise it is not enough to continuously improve SEI / CEI in subsequent cycles, and should not be too high, otherwise the too thick organic CEI generated by compound A will significantly deteriorate the performance of lithium ion batteries.

[0045] From Comparative Example 2 and Examples 10-13, the combination of compound A and VC significantly improves the high-temperature storage performance and long cycle performance of the battery.

[0046] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not intended to limit the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, it is not limited to the examples listed in the embodiments. Those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A lithium-ion battery, comprising a positive electrode material, a negative electrode material, and an electrolyte, characterized in that, The positive electrode material includes a positive electrode active material and an inorganic lithium supplementer. The electrolyte includes an electrolyte salt, a non-aqueous organic solvent, and an additive. The additive includes compound A as shown in structural formula I or structural formula II, wherein R1 is selected from trifluoromethylsulfonyl or trifluoromethylsulfinyl, and R2 is (CH2). n n is an integer from 1 to 3. Structural Formula I and Structural Formula II.

2. The lithium-ion battery according to claim 1, characterized in that, n is 1 or 2.

3. The lithium-ion battery according to claim 1, characterized in that, Compound A is selected from at least one of compounds one through three. Compound 1, Compound 2, Compound 3.

4. The lithium-ion battery according to claim 1, characterized in that, With the total mass of the electrolyte salt, the non-aqueous organic solvent, and the additive being 100%, the mass percentage of compound A is 0.05~5.00%.

5. The lithium-ion battery according to claim 1, characterized in that, The additive also includes vinylene carbonate, and the mass percentage of vinylene carbonate is 0.50 to 4.50% based on the total mass of the electrolyte salt, the non-aqueous organic solvent and the additive being 100%.

6. The lithium-ion battery according to claim 1, characterized in that, The electrolyte salt is selected from at least one of lithium hexafluorophosphate, lithium perchlorate, lithium tetrafluoroborate, lithium trifluoromethanesulfonate, lithium bis(trifluoromethanesulfonyl)imide, lithium bis(oxalate-borate), lithium difluorophosphate, lithium bis(oxalate-borate), lithium difluorooxalate-borate, lithium lower aliphatic carboxylic acids, lithium difluorobis(oxalate-phosphate), and lithium bis(oxalate-imide).

7. The lithium-ion battery according to claim 1, characterized in that, The non-aqueous organic solvent is selected from at least one of γ-butyrolactone, γ-valerolactone, δ-valerolactone, methyl acetate, ethyl acetate, ethyl propionate, butyl acetate, propyl propionate, butyl propionate, ethylene carbonate, propylene carbonate, butyl carbonate, methyl pentyl carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, methyl propyl carbonate, propylene carbonate, 1,3-dioxolane, 1,4-dioxane, crown ether, tetrahydrofuran, 2-methyltetrahydrofuran, 2-trifluoromethyltetrahydrofuran, dimethoxymethane, diethoxymethane, ethoxymethoxymethane, ethylene glycol di-n-propyl ether, ethylene glycol di-n-butyl ether, and diethylene glycol dimethyl ether.

8. The lithium-ion battery according to claim 1, characterized in that, The positive electrode active material is selected from at least one of lithium iron phosphate materials, lithium cobalt oxide materials, lithium nickel cobalt manganese oxide materials, or lithium nickel cobalt aluminum oxide materials.

9. The lithium-ion battery according to claim 1, characterized in that, The inorganic lithium supplement is selected from Li2O, Li2C2O4, Li2NiO2 or Li5FeO4.

10. The lithium-ion battery according to claim 1, characterized in that, The negative electrode material includes a negative electrode active material, which is selected from at least one of artificial graphite, natural graphite, soft carbon, hard carbon, lithium titanate, silicon-carbon composite material and silicon-oxygen composite material.

Images