CN112467208A

CN112467208A - Silicon-carbon lithium ion battery containing non-aqueous electrolyte and preparation method and application thereof

Info

Publication number: CN112467208A
Application number: CN201910849387.0A
Authority: CN
Inventors: 母英迪; 王龙; 廖波; 王海; 李素丽; 李俊义; 徐延铭
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2021-03-09

Abstract

The invention provides a silicon-carbon lithium ion battery and a preparation method and application thereof. The lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm and electrolyte, wherein the positive electrode comprises a positive electrode active material, a binder and a conductive agent, the negative electrode comprises a negative electrode active material and a conductive agent, the electrolyte comprises a non-aqueous organic solvent, a conductive lithium salt and an additive, and the additive comprises a phenyl silane compound, vinylene carbonate and fluoroethylene carbonate; the phenyl silane compound can be better complexed with the anode to form a similar protective layer, so that the anode structure is more stable, and the side reaction decomposition of the metal ions dissolved out to catalyze the electrolyte is avoided; and vinylene carbonate and fluoroethylene carbonate can form a better SEI film on the surface of the negative electrode for high-efficiency migration of lithium ions.

Description

Silicon-carbon lithium ion battery containing non-aqueous electrolyte and preparation method and application thereof

Technical Field

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a silicon-carbon lithium ion battery containing a non-aqueous electrolyte, and a preparation method and application thereof.

Background

In recent years, lithium ion batteries are widely used in the fields of digital, energy storage, power, military aerospace, communication equipment and the like. However, with diversification of electronic devices and diversification of functions, people have higher and higher requirements for cruising ability of electronic devices. Therefore, improving the energy density of lithium ion batteries is a current research focus.

The silicon-carbon battery is one of effective means for improving the energy density of the battery, and the electrolyte is one of main materials of the silicon-carbon lithium ion battery and plays a role in transmitting Li in the silicon-carbon lithium ion battery⁺The function of (1). Therefore, research and development of the electrolyte are important for silicon-carbon lithium ion batteries, but the electrolyte which relieves the expansion of the silicon negative electrode and has high and low temperature performance is not easy to develop. At present, the use of additives in electrolytes is a highly effective weapon to solve the above problems. However, it is often difficult to simultaneously achieve high and low temperature performance with current electrolyte additives. Therefore, it is urgently required to develop a high-efficiency additive capable of broadening the service temperature of a silicon-carbon lithium ion battery and prolonging the cycle life of the battery.

Disclosure of Invention

The invention aims to solve the problems that the conventional electrolyte additive inhibits the expansion of a silicon negative electrode and the high and low temperature performance is difficult to be considered, and provides a silicon-carbon lithium ion battery containing a nonaqueous electrolyte, and a preparation method and application thereof.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a silicon-carbon lithium ion battery containing a non-aqueous electrolyte comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, wherein the positive electrode comprises a positive electrode active material, a binder and a conductive agent, the negative electrode comprises a negative electrode active material and a conductive agent, the electrolyte comprises a non-aqueous organic solvent, a conductive lithium salt and an additive, and the additive comprises a phenylsilane compound, vinylene carbonate and fluoroethylene carbonate;

wherein the mass ratio of the phenylsilane compound to the sum of the positive electrode active material and the conductive agent is more than 0 and less than or equal to 0.06; the mass ratio of the vinylene carbonate to the fluoroethylene carbonate to the sum of the negative electrode active material and the conductive agent is more than 0 and less than or equal to 0.05.

Further, the mass ratio of the vinylene carbonate to the fluoroethylene carbonate is 20:1-1:20, for example, 1:1-1: 20.

Further, the mass ratio of the positive electrode active material and the conductive agent is well known in the art.

Further, the mass ratio of the negative electrode active material and the conductive agent is well known in the art.

Further, the mass ratio of the phenylsilane compound to the sum of the positive electrode active material and the conductive agent is not less than 0.005 and not more than 0.06, for example, not more than 0.05, 0.04, 0.03, 0.02, 0.01, 0.005; the mass ratio of the vinylene carbonate and the fluoroethylene carbonate to the sum of the negative electrode active material and the conductive agent is not less than 0.005 and not more than 0.05, for example, not more than 0.04, 0.03, 0.02, 0.01 and 0.005.

Further, the phenylsilane compound has a general structural formula shown in a formula (I):

wherein R is₁、R₂Identical or different, each independently selected from halogen, unsubstituted or optionally substituted by one, two or more R_aSubstituted of the following groups: c_1-12Alkyl radical, C_2-12Alkenyl radical, C_2-12Alkynyl, C_6-20Aryl radicals(ii) a Each R_aIdentical or different, independently of one another, from halogen, C_1-12An alkyl group.

Further, R₁、R₂Same or different, each independently selected from F, C_1-6Alkyl radical, C_2-6Alkenyl, phenyl, naphthyl.

The term "C_1-12Alkyl is understood to preferably mean a straight-chain or branched, saturated monovalent hydrocarbon radical having from 1 to 12 carbon atoms, preferably C_1-10An alkyl group. "C_1-10Alkyl "is understood to preferably mean a straight-chain or branched, saturated monovalent hydrocarbon radical having 1,2,3, 4, 5, 6, 7, 8, 9 or 10 carbon atoms. The alkyl group is, for example, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, an isopropyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an isopentyl group, a 2-methylbutyl group, a 1-ethylpropyl group, a 1, 2-dimethylpropyl group, a neopentyl group, a 1, 1-dimethylpropyl group, a 4-methylpentyl group, a 3-methylpentyl group, a 2-ethylbutyl group, a 1-ethylbutyl group, a 3, 3-dimethylbutyl group, a 2, 2-dimethylbutyl group, a 1, 1-dimethylbutyl group, a 2, 3-dimethylbutyl group, a 1, 3-dimethylbutyl group or a 1, 2-dimethylbutyl group. In particular, the radicals have 1,2,3, 4, 5, 6 carbon atoms ("C)_1-6Alkyl groups) such as methyl, ethyl, propyl, butyl, isopropyl, isobutyl, sec-butyl, tert-butyl, more particularly groups having 1,2 or 3 carbon atoms ("C)_1-3Alkyl groups) such as methyl, ethyl, n-propyl or isopropyl.

The term "C_2-12Alkenyl "is understood to preferably mean a straight-chain or branched monovalent hydrocarbon radical comprising one or more double bonds and having from 2 to 12 carbon atoms, preferably" C_2-10Alkenyl ". "C_2-10Alkenyl "is understood to preferably mean a straight-chain or branched, monovalent hydrocarbon radical which contains one or more double bonds and has 2,3, 4, 5, 6, 7, 8, 9 or 10 carbon atoms, in particular 2 or 3 carbon atoms (" C_2-3Alkenyl "), it being understood that in the case where the alkenyl group comprises more than one double bond, the double bonds may be separated from each other or conjugated. The alkenyl group is, for example, vinyl, alkenePropyl, (E) -2-methylvinyl, (Z) -2-methylvinyl, (E) -but-2-enyl, (Z) -but-2-enyl, (E) -but-1-enyl, (Z) -but-1-enyl, pent-4-enyl, (E) -pent-3-enyl, (Z) -pent-3-enyl, (E) -pent-2-enyl, (Z) -pent-2-enyl, (E) -pent-1-enyl, (Z) -pent-1-enyl, hex-5-enyl, (E) -hex-4-enyl, (Z) -hex-4-enyl, m-E-n-2-enyl, (E) -hex-3-enyl, (Z) -hex-3-enyl, (E) -hex-2-enyl, (Z) -hex-2-enyl, (E) -hex-1-enyl, (Z) -hex-1-enyl, isopropenyl, 2-methylprop-2-enyl, 1-methylprop-2-enyl, 2-methylprop-1-enyl, (E) -1-methylprop-1-enyl, (Z) -1-methylprop-1-enyl, 3-methylbut-3-enyl, 2-methylbut-3-enyl, 1-methylbut-3-enyl, 3-methylbut-2-enyl, (E) -2-methylbut-2-enyl, (Z) -2-methylbut-2-enyl, (E) -1-methylbut-2-enyl, (Z) -1-methylbut-2-enyl, (E) -3-methylbut-1-enyl, (Z) -3-methylbut-1-enyl, (E) -2-methylbut-1-enyl, (Z) -2-methylbut-1-enyl, (E) -1-methylbut-1-enyl, (Z) -1-methylbut-1-enyl, 1-dimethylprop-2-enyl, 1-ethylprop-1-enyl, 1-propylvinyl group and 1-isopropylvinyl group.

The term "C_2-12Alkynyl "is understood to mean a straight-chain or branched monovalent hydrocarbon radical comprising one or more triple bonds and having from 2 to 12 carbon atoms, preferably" C₂-C₁₀Alkynyl ". The term "C₂-C₁₀Alkynyl "is understood as preferably meaning a straight-chain or branched, monovalent hydrocarbon radical which contains one or more triple bonds and has 2,3, 4, 5, 6, 7, 8, 9 or 10 carbon atoms, in particular 2 or 3 carbon atoms (" C₂-C₃-alkynyl "). The alkynyl group is, for example, ethynyl, prop-1-ynyl, prop-2-ynyl, but-1-ynyl, but-2-ynyl, but-3-ynyl, pent-1-ynyl, pent-2-ynyl, pent-3-ynyl, pent-4-ynyl, hex-1-ynyl, hex-2-ynyl, hex-3-ynyl, hex-4-ynyl, hex-5-ynyl, 1-methylprop-2-ynyl, 2-methylbut-3-ynyl, 1-methylbut-2-ynyl, 3-methylbut-1-ynyl, 1-ethylprop-2-ynyl, prop-2-ynyl, but-3-methylbut-1-ynyl, and so-1-ethylprop, 3-methylpent-4-ynyl, 2-methylpent-4-ynyl, 1-methylpent-4-ynyl, 2-methylpent-3-ynyl, 1-methylpent-3-ynyl, 4-methylpent-2-ynyl, 1-methylpent-4-ynylPent-2-ynyl, 4-methylpent-1-ynyl, 3-methylpent-1-ynyl, 2-ethylbut-3-ynyl, 1-ethylbut-2-ynyl, 1-propylprop-2-ynyl, 1-isopropylprop-2-ynyl, 2-dimethylbut-3-ynyl, 1-dimethylbut-2-ynyl or 3, 3-dimethylbut-1-ynyl. In particular, the alkynyl group is ethynyl, prop-1-ynyl or prop-2-ynyl.

The term "C_6-20Aryl "is understood to preferably mean a mono-, bi-or tricyclic hydrocarbon ring having a monovalent or partially aromatic character with 6 to 20 carbon atoms, preferably" C_6-14Aryl ". The term "C_6-14Aryl "is to be understood as preferably meaning a mono-, bi-or tricyclic hydrocarbon ring having a monovalent or partially aromatic character with 6, 7, 8, 9, 10, 11, 12, 13 or 14 carbon atoms (" C_6-14Aryl group "), in particular a ring having 6 carbon atoms (" C₆Aryl "), such as phenyl; or biphenyl, or is a ring having 9 carbon atoms ("C₉Aryl), such as indanyl or indenyl, or a ring having 10 carbon atoms ("C₁₀Aryl radicals), such as tetralinyl, dihydronaphthyl or naphthyl, or rings having 13 carbon atoms ("C₁₃Aryl radicals), such as the fluorenyl radical, or a ring having 14 carbon atoms ("C)₁₄Aryl), such as anthracenyl.

Further, the phenylsilane compound is selected from at least one of the following compounds represented by formula (II) to formula (VII):

further, the non-aqueous organic solvent is selected from carbonate, carboxylic ester and fluoroether, wherein the carbonate is selected from one or more of ethylene carbonate, propylene carbonate, fluoroethylene carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate and methyl propyl carbonate; the carboxylic ester is selected from one or more of ethyl propionate and propyl propionate; the fluoroether is selected from 1,1,2, 3-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl ether.

Furthermore, the lithium salt is one or more of lithium hexafluorophosphate, lithium bis (fluorosulfonyl) imide or lithium bis (trifluoromethanesulfonyl) imide, and the amount of the lithium salt accounts for 10-20% of the total mass of the nonaqueous electrolyte.

Further, the positive electrode active material is selected from LiCoO₂、LiNiO₂、LiMn₂O₄、LiFePO₄、Li_xNi_yM_1-yO₂Wherein x is more than or equal to 0.9 and less than or equal to 1.2, and y is more than or equal to 0.5<1, M is selected from one or more of Co, Mn, Al, Mg, Ti, Zr, Fe, Cr, Mo, Cu and Ca.

Further, the negative active material is graphite or a graphite composite material containing 1-12 wt.% SiOx/C or Si/C, wherein 2> x > 0.

Further, the conductive agent is selected from conductive agents known in the art for preparing a positive electrode or a negative electrode, for example, from acetylene black, carbon nanotubes, and the like.

Further, the separator is a separator known in the art, such as a polyethylene separator, a polypropylene separator, and the like.

The invention also provides a preparation method of the lithium ion battery containing the nonaqueous electrolyte, which comprises the following steps:

(1) preparing a positive plate and a negative plate, wherein the positive plate contains a positive active substance, and the negative plate contains a negative active substance;

(2) mixing a non-aqueous organic solvent, a conductive lithium salt and an additive, and ensuring that the mass ratio of the phenyl silane compound to the sum of the positive active material and the conductive agent is less than or equal to 0.06; the mass ratio of vinylene carbonate to fluoroethylene carbonate to the sum of the negative electrode active material and the conductive agent is less than or equal to 0.05, and an electrolyte is prepared;

(3) winding the positive plate, the diaphragm and the negative plate to obtain a naked battery cell without liquid injection; and (3) placing the bare cell in an outer packaging foil, injecting the electrolyte in the step (2) into the dried bare cell, and preparing to obtain the lithium ion battery.

Exemplarily, the method specifically comprises the following steps:

1) preparing a positive plate:

mixing ternary material (LiNi) of positive electrode active material_0.5Co_0.3Mn_0.2O₂) Mixing polyvinylidene fluoride (PVDF) serving as a binder and acetylene black serving as a conductive agent according to a weight ratio of 96.5:2:1.5, adding N-methylpyrrolidone (NMP), and stirring under the action of a vacuum stirrer until a mixed system becomes uniform and flowable anode slurry; uniformly coating the positive electrode slurry on an aluminum foil with the thickness of 9-12 mu m; drying the coated aluminum foil in an oven at the temperature of 100-130 ℃ for 4-10h, and then rolling and slitting to obtain a required positive plate;

2) preparing a silicon-carbon negative plate:

95.9% of silicon-carbon negative electrode material (formed by compounding SiO and graphite, the SiO accounts for 10% by mass), 0.1% of single-walled carbon nanotube (SWCNT) conductive agent, 1% of conductive carbon black (SP) conductive agent, 1% of sodium carboxymethylcellulose (CMC) binder and 2% of Styrene Butadiene Rubber (SBR) binder by mass are made into slurry by a wet process, the slurry is coated on the surface of a negative current collector copper foil, and a silicon-carbon negative electrode sheet is obtained by drying (the temperature is 85 ℃, the time is 5h), rolling and die cutting;

3) preparing an electrolyte:

uniformly mixing ethylene carbonate, propylene carbonate, diethyl carbonate and n-propyl propionate according to the mass ratio of 20:20:25:35 in a glove box filled with argon and having qualified water oxygen content, and quickly adding 1mol/L of fully dried lithium hexafluorophosphate (LiPF)₆) Phenyl silane compounds, vinylene carbonate and fluoroethylene carbonate, and the mass ratio of the phenyl silane compounds to the positive electrode active material and the conductive agent is ensured to be less than or equal to 0.06; the mass ratio of vinylene carbonate to fluoroethylene carbonate to the negative active material to the conductive agent is less than or equal to 0.05, and electrolyte is prepared;

4) preparing a diaphragm:

selecting a polyethylene diaphragm with the thickness of 7-9 mu m;

5) preparation of lithium ion battery

Winding the prepared positive plate, the diaphragm and the prepared negative plate to obtain a naked battery cell without liquid injection; placing the bare cell in an outer packaging foil, injecting the prepared electrolyte into the dried bare cell, and performing vacuum packaging, standing, formation, shaping, sorting and other processes to obtain the required lithium ion battery.

Furthermore, the reversible gram capacity of the lithium ion battery is more than or equal to 420 mAh/g.

Has the advantages that:

the invention provides a silicon-carbon lithium ion battery and a preparation method and application thereof. The lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm and electrolyte, wherein the positive electrode comprises a positive electrode active material, a binder and a conductive agent, the negative electrode comprises a negative electrode active material and a conductive agent, the electrolyte comprises a non-aqueous organic solvent, a conductive lithium salt and an additive, and the additive comprises a phenyl silane compound, vinylene carbonate and fluoroethylene carbonate; the phenyl silane compound can be better complexed with the anode to form a similar protective layer, so that the anode structure is more stable, and the side reaction decomposition of the metal ions dissolved out to catalyze the electrolyte is avoided; and vinylene carbonate and fluoroethylene carbonate can form a better SEI film on the surface of the negative electrode for high-efficiency migration of lithium ions. In conclusion, the two additives are comprehensively protected, the mass ratios of the three additives to the positive and negative electrode active substances and the conductive agent are respectively limited, and a tough interface film with low impedance can be formed, so that the expansion of the silicon-carbon negative electrode can be relieved, and the cycle life of the battery can be prolonged.

Detailed Description

The preparation method of the present invention will be described in further detail with reference to specific examples. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.

The experimental methods used in the following examples are all conventional methods unless otherwise specified; reagents, materials and the like used in the following examples are commercially available unless otherwise specified.

Comparative examples 1 to 6 and examples 1 to 9

The lithium ion batteries of comparative examples 1 to 6 and examples 1 to 9 were each prepared according to the following preparation method, except for the selection and addition of additives, and the specific differences are shown in tables 1 and 2.

(1) Preparation of positive plate

LiNi as positive electrode active material_0.5Co_0.3Mn_0.2O₂Mixing polyvinylidene fluoride (PVDF) serving as a binder and acetylene black serving as a conductive agent according to a weight ratio of 96.5:2:1.5, adding N-methylpyrrolidone (NMP), and stirring under the action of a vacuum stirrer until a mixed system becomes uniform and flowable anode slurry; uniformly coating the positive electrode slurry on an aluminum foil with the thickness of 9-12 mu m; baking the coated aluminum foil in 5 sections of baking ovens with different temperature gradients, drying the aluminum foil in a baking oven at 120 ℃ for 8 hours, and rolling and cutting to obtain the required positive plate.

(2) Preparation of silicon-carbon negative plate

Preparing a silicon-carbon negative electrode material (formed by compounding SiO and graphite, wherein the SiO accounts for 10% by mass) with the mass ratio of 95.9%, a single-walled carbon nanotube (SWCNT) conductive agent with the mass ratio of 0.1%, a conductive carbon black (SP) conductive agent with the mass ratio of 1%, a sodium carboxymethylcellulose (CMC) binder with the mass ratio of 1% and a Styrene Butadiene Rubber (SBR) binder with the mass ratio of 2% into slurry by a wet process, coating the slurry on the surface of a negative current collector copper foil, drying (the temperature is 85 ℃, the time is 5 hours), rolling and die cutting to obtain the silicon-carbon negative electrode.

(3) Preparation of electrolyte

Uniformly mixing ethylene carbonate, propylene carbonate, diethyl carbonate and n-propyl propionate according to the mass ratio of 20:20:25:35 in a glove box filled with argon and having qualified water oxygen content (the solvent needs to be normalized), and quickly adding 1mol/L of fully dried hexafluorophosphorus hexafluorideLithium carbonate (LiPF)₆) And additives (specific amounts and selections are shown in tables 1 and 2) to obtain an electrolyte.

(4) Preparation of the separator

Selecting a polyethylene diaphragm with the thickness of 7-9 mu m.

(5) Preparation of lithium ion battery

Table 1 compositions of lithium ion batteries prepared in comparative examples 1 to 6

Table 2 compositions of lithium ion batteries prepared in examples 1 to 9

The lithium ion batteries in the examples and comparative examples were tested for high temperature cycle and low temperature discharge performance under the following specific test conditions:

high-temperature cycle test: the battery is placed at 45 ℃, the battery is subjected to charge-discharge circulation by using 1C current in a charge-discharge voltage interval of 2.8-4.4V, the initial capacity Q and the initial thickness T are recorded, and the capacity Q of the battery which is circulated to 400 weeks is selected₁And thickness is denoted as T₀The capacity retention rate of the battery at a high temperature cycle of 400 weeks was calculated by the following formula:

capacity retention (%) ═ Q₁/Q×100；

Thickness change rate (%) - (T-T)₀)/T×100；

And (3) low-temperature discharge test: the cell was charged and discharged 3 times at 1C rate at room temperature, then charged to full charge at 1C rate, and the 1C capacity Q was recorded₀. Will be full ofThe battery in the electric state is placed at-20 ℃ for 4 hours, then discharged to 3V at 0.4C rate, and the discharge capacity Q is recorded₂And calculating the low-temperature discharge capacity retention rate, recording the result, and calculating the low-temperature discharge capacity retention rate of the battery according to the following formula:

capacity retention (%) ═ Q₂/Q×100。

TABLE 3 test results of comparative examples 1-6 and examples 1-9

Group of	Retention ratio of high temperature circulating capacity%	Thickness expansion Rate%	Retention ratio of discharge capacity at low temperature of-20%
				Comparative example 1	54.2	44.3	31.8
Comparative example 2	61.3	45.1	32.3
				Comparative example 3	59.3	50.4	29.2
Comparative example 4	66.4	38.2	37.5
				Comparative example 5	58.3	40.8	28.9
Comparative example 6	61.9	39.3	29.8
				Example 1	82.8	21.1	50.3
Example 2	80.3	22.3	51.4
				Example 3	84.8	24.3	55.9
Example 4	85.7	27.9	56.5
				Example 5	86.4	18.8	55.7
Example 6	81.5	19.2	54.4
				Example 7	84.8	24.9	60.9
Example 8	82.7	26.9	57.5
				Example 9	84.3	25.3	59.9

From the data, it is obvious that the combination of the phenylsilane compound, the vinylene carbonate and the fluoroethylene carbonate has obvious beneficial effects on high-temperature cycle and low-temperature discharge of the lithium ion battery, and the phenyl silane compound, the vinylene carbonate and the fluoroethylene carbonate are mixed and added into the electrolyte, so that the preparation method has outstanding advantages, and mainly shows that the high-temperature and low-temperature electrical properties of the battery are improved. The examples 1-9 are obviously superior to the comparative examples, so that the battery prepared by the electrolyte has extremely high durability and market value and social benefit.

The reason why the cell performance is deteriorated without or with the addition amount exceeding the ratio in comparative examples 1 to 6 is that the resistance is too large due to the excessive side reaction of the additive, and the cycle performance of the silicon-carbon lithium ion battery using the electrolyte according to the present invention is significantly improved, and the low temperature performance of the battery is also significantly improved.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A silicon-carbon lithium ion battery containing a non-aqueous electrolyte comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, wherein the positive electrode comprises a positive electrode active material, a binder and a conductive agent, the negative electrode comprises a negative electrode active material and a conductive agent, the electrolyte comprises a non-aqueous organic solvent, a conductive lithium salt and an additive, and the additive comprises a phenylsilane compound, vinylene carbonate and fluoroethylene carbonate;

2. The battery according to claim 1, wherein the vinylene carbonate and fluoroethylene carbonate are present in a mass ratio of 20:1 to 1:20, such as 1:1 to 1: 20.

3. The battery according to any one of claims 1 to 2, wherein the mass ratio of the phenylsilane-based compound to the sum of the masses of the positive electrode active material and the conductive agent is 0.005 or more and 0.06 or less, for example, 0.05 or less, 0.04 or less, 0.03 or less, 0.02 or less, 0.01 or less, and 0.005 or less; the mass ratio of the vinylene carbonate and the fluoroethylene carbonate to the sum of the negative electrode active material and the conductive agent is not less than 0.005 and not more than 0.05, for example, not more than 0.04, 0.03, 0.02, 0.01 and 0.005.

4. The battery according to any one of claims 1 to 3, wherein the phenylsilane compound has a general structural formula represented by formula (I):

wherein R is₁、R₂Identical or different, each independently selected from halogen, unsubstituted or optionally substituted by one, two or more R_aSubstituted of the following groups: c_1-12Alkyl radical, C_2-12Alkenyl radical, C_2-12Alkynyl, C_6-20An aryl group; each R_aIdentical or different, independently of one another, from halogen, C_1-12An alkyl group.

5. The battery of any one of claims 1-4, wherein R₁、R₂Same or different, each independently selected from F, C_1-6Alkyl radical, C_2-6Alkenyl, phenyl, naphthyl.

6. The battery according to any one of claims 1 to 5, wherein the phenylsilane-based compound is at least one selected from the group consisting of compounds represented by the following formulae (II) to (VII):

7. the battery according to any one of claims 1 to 6, wherein the non-aqueous organic solvent is selected from the group consisting of carbonates, carboxylic esters and fluoroethers, wherein the carbonates are selected from one or more combinations of ethylene carbonate, propylene carbonate, fluoroethylene carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, and methyl propyl carbonate; the carboxylic ester is selected from one or more of ethyl propionate and propyl propionate; the fluoroether is selected from 1,1,2, 3-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl ether.

8. The battery according to any one of claims 1 to 7, wherein the lithium salt is one or more of lithium hexafluorophosphate, lithium bis (fluorosulfonyl) imide or lithium bis (trifluoromethanesulfonyl) imide, and is used in an amount of 10 to 20% by mass based on the total mass of the nonaqueous electrolytic solution.

9. The battery according to any one of claims 1 to 8, wherein the positive electrode active material is selected from LiCoO₂、LiNiO₂、LiMn₂O₄、LiFePO₄、Li_xNi_yM_1-yO₂Wherein x is more than or equal to 0.9 and less than or equal to 1.2, and y is more than or equal to 0.5<1, M is selected from one or more of Co, Mn, Al, Mg, Ti, Zr, Fe, Cr, Mo, Cu and Ca.

Preferably, the negative active material is graphite or a graphite composite material containing 1-12 wt.% SiOx/C or Si/C, wherein 2> x > 0.

10. The battery according to any one of claims 1-9, wherein the lithium ion battery has a reversible gram capacity of 420mAh/g or more.