CN115188953A - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
CN115188953A
CN115188953A CN202211093404.0A CN202211093404A CN115188953A CN 115188953 A CN115188953 A CN 115188953A CN 202211093404 A CN202211093404 A CN 202211093404A CN 115188953 A CN115188953 A CN 115188953A
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active material
oil absorption
secondary battery
absorption value
negative
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Inventor
赵晓锋
刘静
高飞
张放南
杨红新
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Svolt Energy Technology Co Ltd
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Svolt Energy Technology 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
    • 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
    • H01M4/366—Composites as layered products
    • 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
    • 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
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

The invention belongs to the technical field of secondary batteries, and particularly relates to a secondary battery with better cyclicity and stability. On the basis of a traditional secondary battery material system, the secondary battery controls the oil absorption value QA of the positive active material and the oil absorption value QB of the negative active material to meet the following relational expression by paying attention to the oil absorption value parameters of the whole of the positive material and the negative material, particularly the oil absorption value proportion between the positive material and the negative material: QA/QB is more than or equal to 0.01 and less than or equal to 10, and the dynamic balance among lithium ion battery materials is optimized. According to the secondary battery, the appropriate oil absorption values of the positive and negative active materials are designed, so that the secondary battery has excellent insertion and extraction capacity in the charging and discharging processes, the impedance and the liquid retention capacity between the material and the electrolyte are improved by the appropriate oil absorption value proportion, and the cycle performance of the material is improved.

Description

Secondary battery
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a secondary battery with better cyclicity and stability.
Background
A secondary battery (Rechargeable battery), also called a Rechargeable battery or a secondary battery, is a battery that can be continuously used by activating an active material by charging after the battery is discharged. The charging and discharging cycle of the rechargeable battery can reach thousands of times to ten thousand times, so the rechargeable battery is more economical and practical compared with a dry battery. At present, the main rechargeable batteries in the market include nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid (or lead storage) batteries, lithium ion batteries, sodium ion batteries, polymer lithium ion batteries, and the like, and particularly, the lithium ion batteries are widely applied and have higher requirements on the application performance of the lithium ion batteries.
At present, with the improvement of the application requirements of the market on the lithium ion battery, the lithium ion battery with energy density and quick charging performance becomes a preferred product. According to research, in order to take account of energy density and quick charge performance of the lithium ion battery, positive and negative electrode materials used by the lithium ion battery are required to have more ideal compatibility with an electrolyte, and meanwhile, the surface properties of the positive and negative electrode materials have larger influence on the cycle and impedance performance of the battery. However, in the conventional battery material, due to the amorphous carbon coated on the surfaces of the positive electrode material and the negative electrode graphite, different compatibility exists between chemical groups on the surface of the ternary material and the electrolyte, so that the interface impedance of the material is different, the insertion and extraction of lithium ions in the charging and discharging processes of the material are influenced, and the multiplying power, the cycle and the like of the battery are further adversely influenced. Therefore, how to balance the dynamic performance between the positive and negative electrode materials is crucial to the performance of the lithium ion battery.
The oil absorption value reflects the change from a free flowing state to a semi-plastic agglomerate of the material with dibutyl phthalate (DBP) and the increasing viscosity of the mixture is transmitted to the torque sensing system of the oil absorption meter. Generally, the higher the oil absorption value, the better the compatibility of the material with the organic electrolyte; and the lower the oil absorption value, the poorer the compatibility of the material with the organic electrolyte. In the prior art, in the development and optimization process of lithium ion batteries, consideration of the oil absorption value of a material is usually limited to the oil absorption value of a negative electrode active material, but in practical research, the optimization of the battery performance by simply selecting a negative electrode material with a proper oil absorption value is very limited, and deep research on the balance among the lithium ion battery material performances is required.
Disclosure of Invention
Therefore, the invention aims to provide a secondary battery with better cyclability and stability, and the secondary battery simultaneously considers excellent dynamic performance and cyclability and can meet the requirements of energy density and quick charge performance by screening and controlling oil absorption values of different materials.
In order to solve the technical problem, the secondary battery comprises a positive pole piece, a negative pole piece, a separation film and electrolyte;
the positive pole piece comprises a positive active material, and the negative pole piece comprises a negative active material;
the oil absorption value QA of the positive electrode active material and the oil absorption value QB of the negative electrode active material satisfy the following relational expression: QA/QB is more than or equal to 0.01 and less than or equal to 10.
Wherein the QA and QB values are tested by the method in GB/T3780.2-2017.
Specifically, in the secondary battery:
the positive active material has an oil absorption value QA of 1-100ml/100g;
the oil absorption value QB of the negative active material is 10-100ml/100g.
Preferably, in the secondary battery, the oil absorption value QA of the positive electrode active material and the oil absorption value QB of the negative electrode active material satisfy the following relationship: QA/QB is more than or equal to 0.14 and less than or equal to 1.33.
Preferably, in the secondary battery:
the positive electrode active material preferably has an oil absorption value QA of 10 to 40ml/100g;
the negative electrode active material preferably has an oil absorption value QB of 30 to 70ml/100g.
Specifically, in the secondary battery, the positive electrode sheet includes a positive electrode current collector and a positive electrode diaphragm disposed on at least one surface of the positive electrode current collector, and the positive electrode diaphragm is formed at least by the positive electrode active material;
the positive electrode active material includes LiCoO 2 、LiFePO 4 、LiMnO 4、 Na 3 V 2 (PO4) 2 O 2 F、Na x Ni a Mn b M c O 2 Or LiNCM;
preferably, the formula of the LiNCM material is Li a Ni x Co y M 1-x-y O 2 Wherein M is selected from Al and/or Mn elements, and each parameter satisfies the following relation: a is more than or equal to 0.95 and less than or equal to 1.2<x<1，0<y<1，0<x+y<1；
Preferably, the Na is x Ni a Mn b M c O 2 (ii) a Wherein x is more than or equal to 0.7 and less than or equal to 1, a is more than or equal to 0, 0.6 and more than or equal to b is more than 0, c is more than 0, and a + b + c =1; m is selected from any one of Li, mg, al, B, la, zn, ti or Cu elements.
Preferably, in the secondary battery:
the specific surface area of the positive electrode active material is 5-30m 2 /g；
The particle size D50 of the positive electrode active material is 0.5-20 μm;
in the positive electrode active material, the amorphous carbon coating amount is 0 to 5wt%, preferably 0.5 to 3wt%, and more preferably 1 to 2wt%.
Specifically, in the secondary battery, the negative electrode sheet includes a negative electrode current collector and a negative electrode diaphragm disposed on at least one surface of the negative electrode current collector, and the negative electrode diaphragm is formed at least by the negative electrode active material;
the negative active material comprises at least one of artificial graphite, natural graphite, soft carbon, hard carbon, mesocarbon microbeads, a silicon-based material, a tin-based material or lithium titanate; specifically, the hard carbon can be selected from traditional materials such as anthracite and the like.
Preferably, in the secondary battery:
the specific surface area of the negative electrode active material is 0.5-10m 2 /g；
The particle size D50 of the negative electrode active material is 1-50 μm;
the amount of the amorphous carbon coating in the negative active material is 0 to 5wt%, preferably 0.5 to 3wt%, and more preferably 1 to 2wt%.
In the scheme of the secondary battery, the positive electrode active material and/or the negative electrode material can be subjected to amorphous carbon coating treatment as required so as to regulate the oil absorption value of the active material within a proper range.
Specifically, in the secondary battery, the electrolyte includes at least one of lithium hexafluorophosphate, lithium perchlorate, sodium hexafluorophosphate, and sodium perchlorate.
Specifically, the secondary battery comprises at least one of a lithium ion battery, a sodium ion battery, a potassium ion battery or an aluminum ion battery; preferably, the secondary battery includes a lithium titanate battery.
On the basis of a traditional secondary battery material system, the secondary battery optimizes the dynamic balance among secondary batteries, particularly lithium ion battery materials, and realizes more optimal control of the insertion and extraction capacity of the battery materials by paying attention to the integral oil absorption value parameters of the positive electrode material and the negative electrode material, particularly the oil absorption value ratio between the positive electrode material and the negative electrode material. According to the secondary battery, particularly the lithium ion battery, the appropriate oil absorption values of the positive and negative active materials are designed, so that lithium ions have excellent insertion and extraction capacity in the charging and discharging processes, the impedance and the liquid retention capacity between the material and the electrolyte are improved by the appropriate oil absorption value proportion, and the cycle performance of the material is improved.
According to the secondary battery, particularly the lithium ion battery, the dynamic balance between the positive electrode active material interface and the negative electrode active material interface of the lithium ion battery and the electrolyte is enabled to have good dynamic performance and structural stability by regulating and controlling the granularity, the specific surface area, the granulation degree, the carbonization or non-carbonization parameters of the positive electrode active material and the negative electrode active material, controlling the proper oil absorption value and controlling the proper oil absorption value proportion, and regulating and controlling the dynamic balance between the secondary battery, particularly the lithium ion battery materials, so that the dynamic balance between the positive electrode active material interface and the negative electrode active material interface of the lithium ion battery and the electrolyte is realized, and the cycle performance and the quick charge performance of the battery are improved. More importantly, the battery material can optimize the cycle performance of the battery under the condition that the physical properties of the material are not ideal through the regulation and control of the oil absorption values of the anode material and the cathode material. Compared with the scheme that only the oil absorption value of the anode or cathode active material is concerned in the traditional lithium ion battery scheme, the lithium ion battery provided by the invention is mainly used for realizing the dynamic balance between the anode and cathode electrode materials, has a better improvement range on the performance of the lithium ion battery, and provides a new idea for the optimization development of the lithium ion battery.
Detailed Description
The technical characteristic detection indexes and detection methods related to the following examples and comparative example schemes are as follows.
Pouch batteries were prepared according to the battery components in the examples and comparative examples as shown in table 1 below, respectively.
Preparing a negative pole piece by taking the graphite negative pole composite material as a negative pole material; lithium iron phosphate or ternary material NCM is used as a positive electrode, and LiPF is used 6 The solution (concentration 1.3 mol/L) is electrolyte, and the solvent is a solvent with the volume ratio of 1:1 EC (ethylene carbonate) + DEC (diethyl carbonate), celegard2400 is a diaphragm, and the 5Ah soft package battery is prepared in sequence.
Carbon coating amount: adopting a thermogravimetric analyzer: firstly, adding a negative electrode active sample with the weight of m1 into equipment, and starting protective gas, wherein the flow is adjusted to be 20mL/min; after 30min, turning on a power supply of a TGA/DSC main machine, and enabling the instrument to enter self-checking for about 1min; opening the computer, double-clicking a 'STARe' icon on the desktop, entering TGA/DSC software, and establishing connection between the software and the instrument; and then heating to 650 ℃ at a heating rate of 10 ℃/min, preserving heat for 1h, then cooling to 80 ℃ under inert gas, taking out the sample, testing the weight of the sample to be m2, and calculating the carbon coating amount = m1-m2/m1.
Testing the active particle size and the specific surface area of the negative active material according to the national standard GB/T243339-2019 lithium ion battery graphite negative material; and the particle size of the material = secondary particle diameter (D50)/primary particle diameter was calculated.
Testing the active granularity and the specific surface area of the positive active material according to the national standard GB/T-30835-2014 carbon composite lithium iron phosphate positive material for the lithium ion battery; and the particle size of the material = secondary particle diameter (D50)/primary particle diameter was calculated.
Table 1 examples and comparative example schemes
Figure 702812DEST_PATH_IMAGE001
The performance of the lithium ion batteries prepared by the solutions of examples 1 to 8 and comparative examples 1 to 4, including the oil absorption values of the positive and negative active materials and how the lithium is separated out, were tested, and the related electrochemical performance of the lithium ion batteries was also tested, and the results are reported in table 2 below.
The method for testing the oil absorption value of the powder comprises the following steps: the QA and QB values were tested by the GB/T3780.2-2017 method. Firstly, 60ml of DBP (dibutyl phthalate) solvent is added into equipment, a power switch of an oil absorption value tester is placed at an ON gear, the tester is started, 40.0 +/-0.01 g (corresponding weight) of dry positive pole or negative pole sample is accurately weighed and contained in a proper container; removing the oil nozzle, opening a cover plate of the mixing unit, adding a sample to be tested into the mixing unit, covering the cover plate, aligning the oil nozzle to a circular hole in the cover plate of the mixing unit, and pressing a start/stop switch to start testing; at the end of the test, the test results are printed and the mixing device is cleaned.
The test performance of the soft package battery comprises the following steps:
cycle performance: 1C/1C,2.5-3.65V,25 +/-3 ℃.
Lithium separation test: charging to 3.65V at a constant current of 3C multiplying power, then performing constant voltage test at 0.02C multiplying power, standing for 10min, and then discharging to 2.5V at 1C multiplying power; and repeating the test for 10 times, fully charging the lithium ion battery at 4C, disassembling the negative pole piece, and observing the lithium precipitation condition on the surface of the negative pole piece. Wherein, the pole piece is good when the area of the negative pole surface lithium separating region is equal to 0%, slight lithium separation is considered when the area of the negative pole surface lithium separating region is less than 5%, medium lithium separation is considered when the area of the negative pole surface lithium separating region is 5% -50%, and serious lithium separation is considered when the area of the negative pole surface lithium separating region is more than 50%.
Table 2 lithium ion battery performance test results
Figure 498861DEST_PATH_IMAGE002
As can be seen from the data in the table above, the battery of the present invention realizes the dynamic balance of intercalation/deintercalation capacity in the application process by selecting the positive electrode active material and the negative electrode active material with suitable oil absorption value parameters.
As can be seen from the data in the above table, in the battery solutions of the present invention, the battery materials in examples 1 to 8 obtain more ideal cycle performance and application performance by controlling the anode and cathode materials to have appropriate oil absorption values and oil absorption value ratios. In the embodiment 4, compared with the embodiment 1, the particle size of the negative electrode material is larger, the dynamic deviation is caused, but the carbon coating amount is larger, the high-temperature storage and the side reaction of the material are more, the overall dynamic performance is reduced, and the cycle performance is reduced, but the cycle performance of the battery material is still better through the reasonable control of the oil absorption value; compared with the embodiment 1, the embodiment 5 has the advantages that the low carbon coating amount of the anode has poorer influence on the dynamics of the material, the dynamics imbalance is caused due to better cathode dynamics, the slight lithium precipitation of the battery is caused, and the cycle performance of the battery material is still better through the reasonable control of the oil absorption value; compared with the embodiment 1, the granulation degree of the negative electrode is larger, so that the specific surface of the material is larger, the material dynamics is influenced, and the secondary ball ternary material of the positive electrode material has a small lithium precipitation of the battery due to the fact that the specific surface area is too low, the dynamic deviation is influenced, but the cycle performance of the battery material is still better through reasonable control of the oil absorption value; the particle size, specific surface area and carbon coating amount of the anode and cathode materials in the embodiment 7 are proper, but the cycle performance is reduced due to the fact that the cathode is made of natural graphite, lithium cannot be separated out, and the cycle performance of the battery material is ideal; in example 8, compared with example 1, the negative electrode is lithium titanate, and has a stable structure, low expansion, a high voltage plateau, no lithium precipitation during application, and excellent cycle performance.
In the scheme of the comparative example, due to the specific surface area and the granularity control difference of the anode material and the cathode material, the oil absorption values of the anode material and the cathode material are obviously different, so that the insertion and extraction capacity of the battery in the application process is influenced, and particularly, the dynamic balance performance of the anode material and the cathode material of the battery is insufficient due to the difference of the oil absorption value ratio between the anode material and the cathode material. As in comparative examples 1, 3 and 4, the oil absorption value of the positive electrode material is lower, and the oil absorption value of the negative electrode material is lower in comparative example 2, especially, in comparative example 4, the lower oil absorption value of the positive electrode material and the higher oil absorption value of the negative electrode material are extremely low, which seriously affects the dynamic balance of the battery material performance, seriously affects the insertion and extraction capability of the battery, leads to the increase of lithium precipitation degree, and affects the cycle performance of the battery.
Therefore, the lithium ion battery disclosed by the invention takes the oil absorption values of the positive electrode active material and the negative electrode active material as the investigation parameters, controls different oil absorption values of the materials by controlling the parameters such as the particle size, the specific surface area and the like of the materials, realizes the balance of the oil absorption values between the positive electrode and the negative electrode, achieves different oil absorption value ratios, and is beneficial to the dynamic balance between the positive electrode and the negative electrode.
In conclusion, the lithium ion battery disclosed by the invention has the advantages that the oil absorption values of the positive and negative active materials are reasonably controlled, so that lithium ions have better insertion and extraction capabilities in the charging and discharging processes, the impedance and the liquid retention capacity between the materials and the electrolyte are improved by the proper oil absorption value proportion, the cycle performance of the materials is improved, the cycle performance and the stability performance of the lithium ion battery are optimized, and a new technical support is provided for the optimization development of the lithium ion battery.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.

Claims (10)

1. A secondary battery is characterized by comprising a positive pole piece, a negative pole piece, a separation film and electrolyte;
the positive pole piece comprises a positive active material, and the negative pole piece comprises a negative active material;
the oil absorption value QA of the positive electrode active material and the oil absorption value QB of the negative electrode active material satisfy the following relational expression: QA/QB is more than or equal to 0.01 and less than or equal to 10.
2. The secondary battery according to claim 1, characterized in that:
the positive active material has an oil absorption value QA of 1-100ml/100g;
the oil absorption value QB of the negative electrode active material is 10-100ml/100g.
3. The secondary battery according to claim 2, wherein the oil absorption value QA of the positive electrode active material and the oil absorption value QB of the negative electrode active material satisfy the following relational expression: QA/QB is more than or equal to 0.14 and less than or equal to 1.33.
4. The secondary battery according to claim 3, characterized in that:
the positive active material has an oil absorption value QA of 10-40ml/100g;
the negative active material has an oil absorption value QB of 30 to 70ml/100g.
5. The secondary battery according to any one of claims 1 to 4, wherein the positive electrode sheet includes a positive electrode current collector and a positive electrode membrane provided on at least one surface of the positive electrode current collector, the positive electrode membrane being formed of at least the positive electrode active material;
the positive electrode active material includes LiCoO 2 、LiFePO 4 、LiMnO 4 、Na 3 V 2 (PO4) 2 O 2 F、Na x Ni a Mn b M c O 2 Or LiNCM.
6. The secondary battery according to claim 5, characterized in that:
the specific surface area of the positive electrode active material is 5-30m 2 /g；
The particle size D50 of the positive electrode active material is 0.5-20 μm;
in the positive electrode active material, the amorphous carbon coating amount is 0-5wt%.
7. The secondary battery according to any one of claims 1 to 4, wherein the negative electrode tab comprises a negative electrode current collector and a negative electrode membrane disposed on at least one surface of the negative electrode current collector, the negative electrode membrane being formed of at least the negative electrode active material;
the negative active material comprises at least one of artificial graphite, natural graphite, soft carbon, hard carbon, mesocarbon microbeads, a silicon-based material, a tin-based material or lithium titanate.
8. The secondary battery according to claim 7, characterized in that:
the specific surface area of the negative electrode active material is 0.5-10m 2 /g；
The particle size D50 of the negative electrode active material is 1-50 μm;
in the negative active material, the coating amount of the amorphous carbon is 0-5wt%.
9. The secondary battery of any of claims 1-4, wherein the electrolyte comprises at least one of lithium hexafluorophosphate, lithium perchlorate, sodium hexafluorophosphate, or sodium perchlorate.
10. The secondary battery according to any one of claims 1 to 4, wherein the secondary battery comprises at least one of a lithium ion battery, a sodium ion battery, a potassium ion battery, or an aluminum ion battery.
CN202211093404.0A 2022-09-08 2022-09-08 Secondary battery Pending CN115188953A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103891030A (en) * 2011-10-20 2014-06-25 丰田自动车株式会社 Nonaqueous electrolyte secondary battery and use of same
JP2019071216A (en) * 2017-10-10 2019-05-09 トヨタ自動車株式会社 Nonaqueous secondary battery
CN112072061A (en) * 2019-06-11 2020-12-11 丰田自动车株式会社 Nonaqueous electrolyte secondary battery
CN115000386A (en) * 2022-07-07 2022-09-02 欣旺达电动汽车电池有限公司 Negative electrode active material, negative electrode plate, lithium ion battery and electric equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103891030A (en) * 2011-10-20 2014-06-25 丰田自动车株式会社 Nonaqueous electrolyte secondary battery and use of same
JP2019071216A (en) * 2017-10-10 2019-05-09 トヨタ自動車株式会社 Nonaqueous secondary battery
CN112072061A (en) * 2019-06-11 2020-12-11 丰田自动车株式会社 Nonaqueous electrolyte secondary battery
CN115000386A (en) * 2022-07-07 2022-09-02 欣旺达电动汽车电池有限公司 Negative electrode active material, negative electrode plate, lithium ion battery and electric equipment

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