CN113140782B - High-performance low-cost lithium ion power battery and preparation method thereof - Google Patents

High-performance low-cost lithium ion power battery and preparation method thereof Download PDF

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CN113140782B
CN113140782B CN202110585938.4A CN202110585938A CN113140782B CN 113140782 B CN113140782 B CN 113140782B CN 202110585938 A CN202110585938 A CN 202110585938A CN 113140782 B CN113140782 B CN 113140782B
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graphite
composite material
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negative electrode
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CN113140782A (en
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刘夏
赵成龙
陈梦婷
程凯
胡同飞
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Phylion Battery Co Ltd
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Phylion Battery 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
    • H01M10/052—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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • H01M4/364—Composites as mixtures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/483—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides for non-aqueous cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
    • H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/021—Physical characteristics, e.g. porosity, surface area
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/028—Positive electrodes
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention discloses a high-performance low-cost lithium ion power battery, wherein a positive plate comprises a positive composite material and a positive current collector, and a negative plate comprises a negative composite material and a negative current collector; the positive electrode composite material comprises a ternary composite material, lithium manganate, a positive electrode conductive agent and a positive electrode binder, wherein the ternary composite material consists of NCM811 and NCM 523; in the positive electrode composite material, the mass percentages of NCM811, NCM523 and lithium manganate are respectively 50-70 percent, 20-40 percent and 10 percent; the negative electrode composite material comprises a graphite composite material, silicon oxide, a negative electrode conductive agent and a negative electrode binder, wherein the graphite composite material consists of first graphite and second graphite, and the first graphite and the second graphite have different granularities; in the negative electrode composite material, the mass percentage of the first graphite, the second graphite and the silicon oxide is 48-50 percent, 48-50 percent and 1-3 percent respectively. The lithium ion power battery has the comprehensive advantages of high safety, long service life, high specific energy, low cost and the like.

Description

High-performance low-cost lithium ion power battery and preparation method thereof
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a high-performance low-cost lithium ion power battery and a preparation method thereof.
Background
The lithium ion battery has the advantages of higher energy density, long cycle life, lower self-discharge rate, environmental friendliness and the like, is a universal power supply for portable equipment such as mobile phones, notebook computers, electric tools and the like, and is widely applied to markets such as electric bicycles, electric automobiles and the like along with the rapid development of new energy industries in China.
The traditional lithium ion power battery material system is mainly composed of a single positive electrode material (such as ternary material, lithium iron phosphate, lithium manganate and the like) or a negative electrode material (such as graphite, silicon-based material and the like). When the single positive electrode material and the single negative electrode material are used as electrode materials of lithium batteries, the single positive electrode material and the single negative electrode material have respective advantages and defects, such as stable performance at high temperature and good safety performance of the lithium iron phosphate positive electrode material, but have the defects of low energy density and poor low-temperature performance. The ternary positive electrode material greatly reduces the requirement for cobalt, has obvious price advantage, and meanwhile, the specific capacity of the material is obviously improved, but the safety is poor. Currently, techniques for blending a plurality of positive electrode materials or negative electrode materials as electrode materials have been developed in the prior art in an attempt to overcome various drawbacks of a single material. For example, chinese application CN201010582333.1 discloses a lithium ion power battery of manganese, nickel and titanium series and a preparation method thereof, which mix lithium manganate and ternary composite material as positive electrode active material. Chinese application CN201910399189.9 discloses a lithium ion battery with high energy density, which mixes graphite and silicon-based negative electrode material as negative electrode active material.
However, the lithium ion battery prepared by the scheme cannot meet the requirements of high safety performance, long service life, high energy density and low cost.
Disclosure of Invention
The invention aims to provide a high-performance low-cost lithium ion power battery which has the comprehensive advantages of high safety, long service life, high specific energy, low cost and the like.
The invention provides a high-performance low-cost lithium ion power battery, which comprises a battery cell and a battery film for packaging the battery cell, wherein the battery cell comprises a positive plate, a negative plate, a diaphragm and electrolyte, the diaphragm is positioned between the positive plate and the negative plate, the electrolyte is positioned between the positive plate and the diaphragm and between the negative plate and the diaphragm, the positive plate comprises a positive composite material and a positive current collector, and the negative plate comprises a negative composite material and a negative current collector;
The positive electrode composite material comprises a ternary composite material, lithium manganate, a positive electrode conductive agent and a positive electrode binder, wherein the ternary composite material consists of NCM811 and NCM 523; in the positive electrode composite material, the mass percentages of NCM811, NCM523 and lithium manganate are respectively 50-70 percent, 20-40 percent and 10 percent;
The negative electrode composite material comprises a graphite composite material, silicon oxide, a negative electrode conductive agent and a negative electrode binder, wherein the graphite composite material consists of first graphite and second graphite, and the first graphite and the second graphite have different granularities; in the negative electrode composite material, the mass percentages of the first graphite, the second graphite and the silicon oxide are respectively 48% -50%: 48% -50%: 1 to 3 percent.
The NCM811 and the NCM523 are nickel-cobalt-manganese ternary anode materials, and the contents of three elements of nickel, cobalt and manganese are respectively 8:1:1 and 5:2:3. The NCM811 has higher energy density, but higher cost and lower safety; but NCM523 has slightly lower capacity density than NCM811, but lower cost and better safety; according to the invention, by selecting the three-element materials of NCM811 and NCM523 to be compounded, the comprehensive properties of the positive electrode material, such as energy density, cost, safety and the like, can be balanced.
In addition, the graphite composite material of the invention is composed of the first graphite and the second graphite, and the first graphite and the second graphite have different particle sizes. Therefore, better processability can be achieved through the mutual matching of graphite materials with different granularities, so that the cathode material is easier to process into slurry.
Further, the NCM811 has a D 50 of 9-13 μm and a specific surface area of 0.2-0.5m 2/g; the NCM523 has a D 50 of 10-13 μm and a specific surface area of 0.3-0.8m 2/g.
Further, the D 50 of the lithium manganate is 13-17 mu m, and the specific surface area is less than or equal to 0.8m 2/g.
Further, the positive electrode conductive agent consists of an array type carbon nano tube, conductive carbon black and conductive graphite, and the mass ratio is 1:6:3.
Further, the positive electrode binder is polyvinylidene fluoride.
Further, the D 50 of the first graphite is 14-19 mu m, and the specific surface area is 1.9-3.5m 2/g.
Further, the D 50 of the second graphite is 4-7 mu m, and the specific surface area is less than or equal to 3.0m 2/g.
Further, the D 50 of the silicon oxide is 10.5-16.5 mu m, and the specific surface area is less than or equal to 3.0m 2/g.
Further, the negative electrode conductive agent is conductive carbon black, and the negative electrode binder is acrylonitrile multipolymer.
The invention also provides a preparation method of the high-performance low-cost lithium ion power battery, which comprises the following steps:
(1) Adding NCM811, NCM523, lithium manganate, array carbon nanotubes, conductive carbon black, conductive graphite and polyvinylidene fluoride into N-methyl pyrrolidone to prepare anode slurry; then coating the positive electrode slurry on an aluminum foil, and sequentially drying, rolling, slitting and tabletting to obtain a positive electrode plate;
(2) Adding first graphite, second graphite, silicon oxide, conductive carbon black and acrylonitrile multipolymer into a mixed solvent of ethanol, N-methyl pyrrolidone and deionized water to prepare negative electrode slurry; then coating the negative electrode slurry on a copper foil, and sequentially drying, rolling, slitting and tabletting to obtain a negative electrode plate;
(3) Matching the positive plate and the negative plate prepared in the step (1) and the step (2) with a polyethylene-based ceramic coating diaphragm for lamination, and then injecting electrolyte to assemble the aluminum-shell battery;
(4) The prepared aluminum-shell battery was pre-charged with a current of 0.05C for 46% and then aged at 45 ℃ for 1 to 20 days, wherein the battery had a partial discharge cut-off voltage of 2.7V and a charge cut-off voltage of 4.2V.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the invention, 3 active substances of NCM523, NCM811 and lithium manganate are mixed and mixed to be used as a positive electrode composite material, and two active substances of graphite and silicon oxide are mixed and mixed to be used as a negative electrode composite material, so that a complete lithium ion power battery material system is finally formed. Compared with the prior art, the lithium ion power battery based on the material system has the comprehensive advantages of high safety, long service life, high specific energy, low cost and the like.
Drawings
Fig. 1 is a cycle performance chart of power cells prepared in examples and comparative examples: a. example 1; b. example 2; c. example 3; d. comparative example 1; e. comparative example 2;
Fig. 2 to 4 are safety inspection reports of the power cell prepared in example 1.
Detailed Description
The present invention will be further described with reference to specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the present invention and practice it.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In the following examples, NCM811 was used having D 50 of 9-13 μm and a specific surface area of 0.2-0.5m 2/g; the D 50 of the NCM523 is 10-13 mu m, and the specific surface area is 0.3-0.8m 2/g; the D 50 of the lithium manganate is 13-17 mu m, and the specific surface area is less than or equal to 0.8m 2/g; d 50 of the first graphite is 14-19 mu m, and the specific surface area is 1.9-3.5m 2/g; d 50 of the second graphite is 4-7 mu m, and the specific surface area is less than or equal to 3.0m 2/g; the D 50 of the silicon oxide is 10.5-16.5 mu m, and the specific surface area is less than or equal to 3.0m 2/g.
Example 1
The embodiment provides a high-performance low-cost lithium ion power battery, and the preparation method comprises the following steps:
(1) Adding NCM811, NCM523, lithium manganate, array carbon nanotubes, conductive carbon black, conductive graphite and polyvinylidene fluoride into N-methyl pyrrolidone to prepare anode slurry; wherein, the mass percentage of NCM811, NCM523 and lithium manganate is 50 percent to 40 percent to 10 percent, and the mass ratio of the array carbon nano tube to the conductive carbon black to the conductive graphite is 1:6:3; and then coating the positive electrode slurry on an aluminum foil, and sequentially drying, rolling, slitting and tabletting to obtain the positive electrode plate.
(2) Adding first graphite, second graphite, silicon oxide, conductive carbon black and acrylonitrile multipolymer into a mixed solvent of ethanol, N-methyl pyrrolidone and deionized water to prepare negative electrode slurry; wherein, the mass percentages of the first graphite, the second graphite and the silicon oxide are respectively 49 percent to 2 percent; and then coating the negative electrode slurry on a copper foil, and sequentially drying, rolling, slitting and tabletting to obtain the negative electrode plate.
(3) Matching the positive plate and the negative plate prepared in the step (1) and the step (2) with a polyethylene-based ceramic coating diaphragm for lamination, and then injecting electrolyte to assemble the aluminum-shell battery;
(4) The prepared aluminum-shell battery was pre-charged with a current of 0.05C for 46% and then aged at 45 ℃ for 1 to 20 days, wherein the battery had a partial discharge cut-off voltage of 2.7V and a charge cut-off voltage of 4.2V.
Example 2
The embodiment provides a high-performance low-cost lithium ion power battery, and the preparation method comprises the following steps:
(1) Adding NCM811, NCM523, lithium manganate, array carbon nanotubes, conductive carbon black, conductive graphite and polyvinylidene fluoride into N-methyl pyrrolidone to prepare anode slurry; wherein, the mass percentage of NCM811, NCM523 and lithium manganate is 60 percent to 30 percent to 10 percent, and the mass ratio of the array carbon nano tube to the conductive carbon black to the conductive graphite is 1:6:3; and then coating the positive electrode slurry on an aluminum foil, and sequentially drying, rolling, slitting and tabletting to obtain the positive electrode plate.
(2) Adding first graphite, second graphite, silicon oxide, conductive carbon black and acrylonitrile multipolymer into a mixed solvent of ethanol, N-methyl pyrrolidone and deionized water to prepare negative electrode slurry; wherein, the mass percentages of the first graphite, the second graphite and the silicon oxide are respectively 49 percent to 2 percent; and then coating the negative electrode slurry on a copper foil, and sequentially drying, rolling, slitting and tabletting to obtain the negative electrode plate.
(3) Matching the positive plate and the negative plate prepared in the step (1) and the step (2) with a polyethylene-based ceramic coating diaphragm for lamination, and then injecting electrolyte to assemble the aluminum-shell battery;
(4) The prepared aluminum-shell battery was pre-charged with a current of 0.05C for 46% and then aged at 45 ℃ for 1 to 20 days, wherein the battery had a partial discharge cut-off voltage of 2.7V and a charge cut-off voltage of 4.2V.
Example 3
The embodiment provides a high-performance low-cost lithium ion power battery, and the preparation method comprises the following steps:
(1) Adding NCM811, NCM523, lithium manganate, array carbon nanotubes, conductive carbon black, conductive graphite and polyvinylidene fluoride into N-methyl pyrrolidone to prepare anode slurry; wherein, the mass percentage of NCM811, NCM523 and lithium manganate is 70 percent to 20 percent to 10 percent, and the mass ratio of the array carbon nano tube to the conductive carbon black to the conductive graphite is 1:6:3; and then coating the positive electrode slurry on an aluminum foil, and sequentially drying, rolling, slitting and tabletting to obtain the positive electrode plate.
(2) Adding first graphite, second graphite, silicon oxide, conductive carbon black and acrylonitrile multipolymer into a mixed solvent of ethanol, N-methyl pyrrolidone and deionized water to prepare negative electrode slurry; wherein, the mass percentages of the first graphite, the second graphite and the silicon oxide are respectively 49 percent to 2 percent; and then coating the negative electrode slurry on a copper foil, and sequentially drying, rolling, slitting and tabletting to obtain the negative electrode plate.
(3) Matching the positive plate and the negative plate prepared in the step (1) and the step (2) with a polyethylene-based ceramic coating diaphragm for lamination, and then injecting electrolyte to assemble the aluminum-shell battery;
(4) The prepared aluminum-shell battery was pre-charged with a current of 0.05C for 46% and then aged at 45 ℃ for 1 to 20 days, wherein the battery had a partial discharge cut-off voltage of 2.7V and a charge cut-off voltage of 4.2V.
Comparative example 1
The comparative example provides a lithium ion power battery, the preparation method of which comprises the following steps:
(1) Adding NCM811, NCM523, array carbon nanotubes, conductive carbon black, conductive graphite and polyvinylidene fluoride into N-methyl pyrrolidone to prepare anode slurry; wherein, the mass percentage of NCM811, NCM523 and lithium manganate is 50 percent to 40 percent to 10 percent, and the mass ratio of the array carbon nano tube to the conductive carbon black to the conductive graphite is 1:6:3; and then coating the positive electrode slurry on an aluminum foil, and sequentially drying, rolling, slitting and tabletting to obtain the positive electrode plate.
(2) Adding first graphite, second graphite, conductive carbon black and acrylonitrile multipolymer into a mixed solvent of ethanol, N-methyl pyrrolidone and deionized water to prepare negative electrode slurry; wherein, the mass percentages of the first graphite and the second graphite are respectively 50 percent to 50 percent; and then coating the negative electrode slurry on a copper foil, and sequentially drying, rolling, slitting and tabletting to obtain the negative electrode plate.
(3) Matching the positive plate and the negative plate prepared in the step (1) and the step (2) with a polyethylene-based ceramic coating diaphragm for lamination, and then injecting electrolyte to assemble the aluminum-shell battery;
(4) The prepared aluminum-shell battery was pre-charged with a current of 0.05C for 46% and then aged at 45 ℃ for 1 to 20 days, wherein the battery had a partial discharge cut-off voltage of 2.7V and a charge cut-off voltage of 4.2V.
Comparative example 2
The comparative example provides a lithium ion power battery, the preparation method of which comprises the following steps:
(1) Adding NCM811, NCM523, array carbon nanotubes, conductive carbon black, conductive graphite and polyvinylidene fluoride into N-methyl pyrrolidone to prepare anode slurry; wherein, the mass percentage of NCM811 and NCM523 is 50 percent to 50 percent, and the array carbon nano tube, the conductive carbon black and the conductive graphite are mixed according to the mass ratio of 1:6:3; and then coating the positive electrode slurry on an aluminum foil, and sequentially drying, rolling, slitting and tabletting to obtain the positive electrode plate.
(2) Adding first graphite, second graphite, silicon oxide, conductive carbon black and acrylonitrile multipolymer into a mixed solvent of ethanol, N-methyl pyrrolidone and deionized water to prepare negative electrode slurry; wherein, the mass percentages of the first graphite, the second graphite and the silicon oxide are respectively 49 percent to 2 percent; and then coating the negative electrode slurry on a copper foil, and sequentially drying, rolling, slitting and tabletting to obtain the negative electrode plate.
(3) Matching the positive plate and the negative plate prepared in the step (1) and the step (2) with a polyethylene-based ceramic coating diaphragm for lamination, and then injecting electrolyte to assemble the aluminum-shell battery;
(4) The prepared aluminum-shell battery was pre-charged with a current of 0.05C for 46% and then aged at 45 ℃ for 1 to 20 days, wherein the battery had a partial discharge cut-off voltage of 2.7V and a charge cut-off voltage of 4.2V. The book is provided with
Performance testing
1. The aluminum-shell batteries prepared in examples 1-3 and comparative examples 1-2 were subjected to 50A, 100% DOD normal temperature cycle test, and the results are shown in FIG. 1.
As can be seen from FIG. 1, the batteries prepared in examples 1-3 still maintain a capacity of 80% or more after being cycled at normal temperature for 2500 times or more, which is significantly superior to the batteries of comparative examples 1-2. The battery prepared in example 1 was a preferred example in which the capacity was maintained at 80% or more after the battery was cycled at room temperature for 3200 times or more.
2. The safety test was performed on the aluminum-case battery prepared in example 1, and the results are shown in fig. 2 to 4.
As can be seen from fig. 2 to 4, the battery prepared in example 1 showed no explosion, fire, and leakage phenomena in each test, and showed excellent safety.
In conclusion, the invention uses 3 active substances of NCM523, NCM811 and lithium manganate as the positive electrode composite material and uses two active substances of graphite and silicon oxide as the negative electrode composite material, thereby forming a novel lithium ion power battery material system. The lithium ion power battery based on the material system has the comprehensive advantages of high safety, long service life, high specific energy, low cost and the like, and has wide application prospect.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.

Claims (9)

1. The battery comprises a battery core and a battery film for packaging the battery core, wherein the battery core comprises a positive plate, a negative plate, a diaphragm and electrolyte, the diaphragm is positioned between the positive plate and the negative plate, the electrolyte is positioned between the positive plate and the diaphragm and between the negative plate and the diaphragm, the positive plate comprises a positive composite material and a positive current collector, the negative plate comprises a negative composite material and a negative current collector,
The positive electrode composite material comprises a ternary composite material, lithium manganate, a positive electrode conductive agent and a positive electrode binder, wherein the ternary composite material consists of NCM811 and NCM 523; in the positive electrode composite material, the mass percentages of NCM811, NCM523 and lithium manganate are respectively 50-70 percent, 20-40 percent and 10 percent; the D50 of the NCM811 is 9-13 mu m, and the specific surface area is 0.2-0.5m 2/g; the D50 of the NCM523 is 10-13 mu m, and the specific surface area is 0.3-0.8m 2/g;
The negative electrode composite material comprises a graphite composite material, silicon oxide, a negative electrode conductive agent and a negative electrode binder, wherein the graphite composite material consists of first graphite and second graphite, and the first graphite and the second graphite have different granularities; in the negative electrode composite material, the mass percentage of the first graphite, the second graphite and the silicon oxide is 48-50 percent, 48-50 percent and 1-3 percent respectively.
2. The high-performance low-cost lithium ion power battery according to claim 1, wherein the D50 of the lithium manganate is 13-17 μm, and the specific surface area is less than or equal to 0.8m 2/g.
3. The high-performance low-cost lithium ion power battery according to claim 1, wherein the positive electrode conductive agent consists of an array carbon nanotube, conductive carbon black and conductive graphite, and the mass ratio is 1:6:3.
4. The high performance, low cost lithium ion power cell of claim 1, wherein said positive electrode binder is polyvinylidene fluoride.
5. The high performance, low cost lithium ion power cell of claim 1, wherein said first graphite has a D50 of 14-19 μm and a specific surface area of 1.9-3.5m 2/g.
6. The high performance, low cost lithium ion power battery of claim 1, wherein said second graphite has a D50 of 4-7 μm and a specific surface area of 3.0m 2/g or less.
7. The high-performance low-cost lithium ion power battery according to claim 1, wherein the silicon oxide has a D50 of 10.5-16.5 μm and a specific surface area of 3.0m 2/g or less.
8. The high performance, low cost lithium ion power cell of claim 1, wherein said negative electrode conductive agent is conductive carbon black and said negative electrode binder is an acrylonitrile multipolymer.
9. The method for preparing a high-performance, low-cost lithium-ion power battery according to any one of claims 1 to 8, comprising the steps of:
(1) Adding NCM811, NCM523, lithium manganate, array carbon nanotubes, conductive carbon black, conductive graphite and polyvinylidene fluoride into N-methyl pyrrolidone to prepare anode slurry; then coating the positive electrode slurry on an aluminum foil, and sequentially drying, rolling, slitting and tabletting to obtain a positive electrode plate;
(2) Adding first graphite, second graphite, silicon oxide, conductive carbon black and acrylonitrile multipolymer into a mixed solvent of ethanol, N-methyl pyrrolidone and deionized water to prepare negative electrode slurry; then coating the negative electrode slurry on a copper foil, and sequentially drying, rolling, slitting and tabletting to obtain a negative electrode plate;
(3) Matching the positive plate and the negative plate prepared in the step (1) and the step (2) with a polyethylene-based ceramic coating diaphragm for lamination, and then injecting electrolyte to assemble the aluminum-shell battery;
(4) The prepared aluminum-shell battery was pre-charged with a current of 0.05C for 46% and then aged at 45 ℃ for 1 to 20 days, wherein the battery had a partial discharge cut-off voltage of 2.7V and a charge cut-off voltage of 4.2V.
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