CN114122314A - Secondary battery - Google Patents

Secondary battery Download PDF

Info

Publication number
CN114122314A
CN114122314A CN202111305819.5A CN202111305819A CN114122314A CN 114122314 A CN114122314 A CN 114122314A CN 202111305819 A CN202111305819 A CN 202111305819A CN 114122314 A CN114122314 A CN 114122314A
Authority
CN
China
Prior art keywords
active material
negative
secondary battery
current collector
positive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111305819.5A
Other languages
Chinese (zh)
Inventor
吕庆文
安建
金柱�
王强
涂贤能
何珊珊
项海标
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huizhou Liwinon Energy Technology Co Ltd
Original Assignee
Huizhou Liwinon Energy Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huizhou Liwinon Energy Technology Co Ltd filed Critical Huizhou Liwinon Energy Technology Co Ltd
Priority to CN202111305819.5A priority Critical patent/CN114122314A/en
Publication of CN114122314A publication Critical patent/CN114122314A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/80—Porous plates, e.g. sintered carriers
    • 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

Abstract

The invention belongs to the technical field of secondary batteries, and particularly relates to a secondary battery which comprises a positive plate, a negative plate, a diaphragm, electrolyte and a shell, wherein the diaphragm is used for separating the positive plate from the negative plate, the shell is used for installing the positive plate, the negative plate, the diaphragm and the electrolyte, the positive plate comprises a positive current collector and a positive active material layer arranged on at least one surface of the positive current collector, the negative plate comprises a negative current collector and a negative active material layer arranged on at least one surface of the negative current collector, the positive current collector and the negative current collector are carbon material films, and the carbon material films have porous structures. The secondary battery can store electrolyte, improve the wettability between an active substance and a current collector, and improve the ion transition capacity and speed; the carbon material has good conductivity, reduces ion migration resistance and improves battery rate.

Description

Secondary battery
Technical Field
The invention belongs to the technical field of secondary batteries, and particularly relates to a secondary battery.
Background
Lithium ion batteries have been widely commercialized due to their characteristics of high energy density, long life, no memory effect, safety, environmental protection, etc. And along with the popularization and the development of wearable electronic intelligent equipment such as intelligent bracelet, smart mobile phone, OLED, AR/VR, lead to the power consumption increase of equipment, the duration shortens greatly, seriously influences people's experience and feels, promotes the duration of battery and has become the problem that needs the solution urgently. Therefore, the requirement on the energy density of the battery is higher and higher, and simultaneously, the requirement on the quick charging capacity of the battery is also higher, and the lithium ion battery on the current market hardly meets the charging requirement of large multiplying power.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the secondary battery is provided, which can store electrolyte, improve the wettability between an active substance and a current collector and improve the ion transition capacity and the ion transition rate; the carbon material has good conductivity, reduces ion migration resistance and improves battery rate.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a secondary battery, includes positive plate, negative pole piece, diaphragm, electrolyte and casing, the diaphragm is used for separating positive plate with the negative pole piece, the casing is used for installing positive plate, negative pole piece, diaphragm and electrolyte, positive plate include the anodal mass flow body and set up in the anodal active material layer on the at least surface of anodal mass flow body, the negative pole piece include the negative pole mass flow body with set up in the negative pole active material layer on the at least surface of negative pole mass flow body, the anodal mass flow body with the negative pole mass flow body is the carbon material film, the carbon material film has porous structure.
The porous carbon material film is adopted, so that the electrolyte can be stored, the infiltration performance among the positive/negative active substances, the current collector and the diaphragm is better, the problem of interface infiltration is solved, and the transition capacity and the rate of lithium ions are improved; the carbon material film disclosed by the invention is excellent in conductivity, the conductivity of the material can be further improved, the resistance in the ion migration process is reduced, and the charging performance is improved; the preparation of the ultrathin cathode coating can shorten the resistance in the Li ion migration process and reduce the ion migration distance, thereby improving the charge rate of the lithium ion battery.
As an improvement of a secondary battery of the present invention, the carbon material film is one of a carbon fiber film, a polytetrafluoroethylene film or a carbon nanotube film metal composite film.
As an improvement of the secondary battery of the present invention, the preparation method of the carbon fiber film comprises: mixing and dissolving ferrocene and thiophene in a solvent according to a weight ratio of 2-10: 1-3 to obtain a mixed solution, placing the mixed solution in a cracking furnace, setting the cracking temperature to be 800-2000 ℃, and the cracking time to be 5-30 min to obtain the carbon fiber film.
As an improvement of a secondary battery of the present invention, the positive electrode active material layer includes a positive electrode active material having a core-shell structure. The active material with the core-shell structure can store electrolyte, so that the infiltration performance among the positive active material, the current collector, the negative active material and the diaphragm is better, the problem of interface infiltration is solved, the transition capacity and the rate of lithium ions are improved, the conductivity of the carbon material is excellent, the conductivity of the material can be further improved, the resistance in the ion migration process is reduced, and the rate performance of the battery is improved. Preferably, the surfaces of the positive electrode current collector and the negative electrode current collector are both provided with active materials having a core-shell structure.
As an improvement of a secondary battery of the present invention, the concentration of the positive electrode active material in the positive electrode active material layer is decreased from the inside to the outside. The concentration gradient can be set by coating with a multi-die by adopting a multi-coating technology or using materials with different densities.
As an improvement of a secondary battery of the present invention, the concentration gradient of the positive electrode active material is 1% to 20%. The concentration of the inside of the positive electrode active material layer is high, and the concentration of the outside is low. The positive active material comprises one or more of lithium cobaltate, lithium manganate, lithium nickel cobalt manganese, lithium nickel manganese, lithium-rich manganese and lithium iron phosphate. The positive active material is provided with a certain concentration gradient, which is beneficial to the movement of ions and improves the performance.
As an improvement of a secondary battery of the present invention, the negative electrode active material layer includes one or more negative electrode active materials of a carbon-based active material, a silicon-based active material, a tin-based active material, a nitrogen-containing active material, or an alloy-based active material.
As an improvement of a secondary battery of the present invention, the negative electrode active material is a nano negative electrode active material. The particle size reaches 100 nm-20 mu m grade through dispersion of a high-speed disperser, the rotating speed of a dispersing device is 10000 r/min-30000 r/min, and the high-speed dispersion of the negative electrode material is to reduce the particle size, so that an ultrathin coating is convenient to prepare, the lithium ion migration distance is shortened during charging, the lithium ion de-intercalation rate is improved, and the problem of high-rate charging of a battery is solved.
As an improvement of a secondary battery of the present invention, the thickness of the positive electrode active material layer and/or the negative electrode active material layer is 4 μm to 18 μm.
As an improvement of the secondary battery of the present invention, the thickness of the positive electrode sheet and/or the negative electrode sheet is 10 μm to 50 μm. The cathode coating is thin, so that the resistance in the lithium ion migration process can be shortened, the ion migration distance is reduced, and the charging rate is improved.
Compared with the prior art, the invention has the beneficial effects that: the secondary battery can store electrolyte, improve the wettability between an active substance and a current collector, and improve the ion transition capacity and speed; the carbon material has good conductivity, reduces ion migration resistance and improves battery rate.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and comparative examples, but the embodiments of the present invention are not limited thereto.
Example 1
A method for manufacturing a secondary battery, comprising the steps of:
step one, mixing lithium cobaltate with a core-shell structure, polyvinylidene fluoride and conductive graphite according to the weight ratio of 93:2.5:3.5, adding the mixture into 200ml of solvent N-methyl pyrrolidone to prepare anode slurry with the solid content of 45%, uniformly stirring the anode slurry, uniformly coating the anode slurry on the surface of an anode current collector by adopting multi-mode multi-coating to form an anode active material layer with a core-shell structure with a concentration gradient, wherein the surface density is 150g/m2～200g/m2And the thickness of the positive active material layer is 10 microns, and then the coated positive pole piece is dried and rolled, wherein the drying temperature is 100 ℃, the time is 2 hours, and the rolling pressure is 5T, so that the positive pole piece with the thickness of 40 microns is obtained.
Step two, mixing conductive carbon black, a binder polyvinylidene fluoride and a conductive agent carbon nano tube CNTs according to the weight part ratio of 85:6:4, adding a high-speed disperser for dispersing, adjusting the rotating speed of a dispersing device to 10000r/min to enable the particle size to reach 300nm, adding the dispersed particles into 300ml of solvent deionized water, uniformly stirring to prepare a negative electrode slurry with the solid content of 40%, coating the negative electrode slurry on the surface of a negative electrode current collector of a carbon fiber film in a multi-mode manner to obtain a negative electrode slurry with the thickness of 10 mu m and the surface density of 15g/m2The coated negative pole piece is dried and rolled at the drying temperature of 100 ℃ for 2.5h and the rolling pressure of 0.3T to obtain the negative pole piece with the thickness of 30 mu m.
Step three, winding and assembling die-cut negative pole pieces, polypropylene diaphragms and positive pole pieces in sequence to form a cell monomer, leading out the cell monomer by welding a tab, separating the positive pole pieces from the negative pole pieces by the diaphragms, welding a metal tab with tab glue to the tab in a rivet welding mode, and finally welding an aluminum plastic film and a naked cell together by top and side sealing to obtain the cell;
and step four, placing the battery core in a vacuum drying box, carrying out vacuum drying for 30h, testing the moisture of the battery core, injecting electrolyte into a glove box filled with inert gas of argon or nitrogen when the moisture is less than 120ppm, carrying out air exhaust and sealing, and carrying out secondary injection to compensate for the loss of the electrolyte to obtain the battery.
The utility model provides a secondary battery, includes positive plate, negative pole piece, diaphragm, electrolyte and casing, the diaphragm is used for separating positive plate with the negative pole piece, the casing is used for installing positive plate, negative pole piece, diaphragm and electrolyte, positive plate include the anodal mass flow body and set up in the anodal active material layer on the at least surface of anodal mass flow body, the negative pole piece include the negative pole mass flow body with set up in the negative pole active material layer on the at least surface of negative pole mass flow body, the anodal mass flow body with the negative pole mass flow body is the carbon material film, the carbon material film has porous structure.
The positive current collector and the negative current collector are carbon fiber film current collectors, and the carbon fiber film is prepared by the following steps: mixing and dissolving ferrocene and thiophene in a solvent according to a weight ratio of 2:1 by using the solvent to prepare a mixed solution, wherein the solvent is formed by mixing methanol and n-hexane, and the volume ratio of the methanol to the n-hexane is 20: 1; the concentration of ferrocene in the mixed solution is 12mg/mL, and the concentration of thiophene is 5 mu L/mL; and cracking the mixed solution in a cracking furnace at 1800 ℃ for 25min to obtain a carbon fiber film current collector, and collecting the carbon fiber film on the surface of the substrate wetted by a wetting liquid in a stretching mode, wherein the wetting liquid is an ethanol water solution with the volume of 30%.
Example 2
The difference from example 1 is that: the positive current collector and the negative current collector are carbon fiber film current collectors, and the carbon fiber film is prepared by the following steps: mixing ferrocene and thiophene in a weight ratio of 3:1 by using a solvent, and dissolving the mixture in the solvent to prepare a mixed solution, wherein the solvent is formed by mixing methanol and n-hexane, and the volume ratio of the methanol to the n-hexane is 15: 1; the concentration of ferrocene in the mixed solution is 10mg/mL, and the concentration of thiophene is 6 mu L/mL; and cracking the mixed solution in a cracking furnace at 1500 ℃ for 20min to obtain the carbon fiber film current collector.
The rest is the same as embodiment 1, and the description is omitted here.
Example 3
The difference from example 1 is that: the positive current collector and the negative current collector are carbon fiber film current collectors, and the carbon fiber film is prepared by the following steps: mixing and dissolving ferrocene and thiophene in a solvent according to a weight ratio of 5:1 to prepare a mixed solution, wherein the solvent is prepared by mixing methanol and n-hexane, and the volume ratio of the methanol to the n-hexane is 13: 2; the concentration of ferrocene in the mixed solution is 30mg/mL, and the concentration of thiophene is 8 mu L/mL; and cracking the mixed solution in a cracking furnace at 1200 ℃ for 30min to obtain the carbon fiber film current collector.
The rest is the same as embodiment 1, and the description is omitted here.
Example 4
The difference from example 1 is that: the positive current collector and the negative current collector are carbon fiber film current collectors, and the carbon fiber film is prepared by the following steps: mixing and dissolving ferrocene and thiophene in a solvent according to a weight ratio of 6:1 by using a solvent to prepare a mixed solution, wherein the solvent is formed by mixing methanol and n-hexane, and the volume ratio of the methanol to the n-hexane is 13: 1; the concentration of ferrocene in the mixed solution is 20mg/mL, and the concentration of thiophene is 5 mu L/mL; and cracking the mixed solution in a cracking furnace at 1600 ℃ for 26min to obtain the carbon fiber film current collector.
The rest is the same as embodiment 1, and the description is omitted here.
Example 5
The difference from example 1 is that: the positive current collector and the negative current collector are carbon fiber film current collectors, and the carbon fiber film is prepared by the following steps: mixing and dissolving ferrocene and thiophene in a solvent according to a weight ratio of 5:1 to prepare a mixed solution, wherein the solvent is prepared by mixing methanol and n-hexane, and the volume ratio of the methanol to the n-hexane is 13: 2; the concentration of ferrocene in the mixed solution is 30mg/mL, and the concentration of thiophene is 4 mu L/mL; and cracking the mixed solution in a cracking furnace at 2000 ℃ for 10min to obtain the carbon fiber film current collector.
The rest is the same as embodiment 1, and the description is omitted here.
Example 6
The difference from example 1 is that: the positive current collector and the negative current collector are carbon fiber film current collectors, and the carbon fiber film is prepared by the following steps: mixing and dissolving ferrocene and thiophene in a solvent according to a weight ratio of 5:1 to prepare a mixed solution, wherein the solvent is prepared by mixing methanol and n-hexane, and the volume ratio of the methanol to the n-hexane is 13: 2; the concentration of ferrocene in the mixed solution is 30mg/mL, and the concentration of thiophene is 4 mu L/mL; and cracking the mixed solution in a cracking furnace at 1200 ℃ for 30min to obtain the carbon fiber film current collector.
The rest is the same as embodiment 1, and the description is omitted here.
Comparative example 1
The difference from example 1 is that: the positive current collector and the negative current collector are commercially available polytetrafluoroethylene films.
The rest is the same as embodiment 1, and the description is omitted here.
Performance testing
The secondary batteries prepared in examples 1 to 6 and comparative example 1 were subjected to performance tests, and the test results are shown in table 1 below.
1. Charging the lithium ion secondary battery to 4.25V at a constant current of 1C at 25 ℃, then charging to 0.05C at a constant voltage of 4.25V, standing for 5min, and then discharging to 2.8V at a constant current of 1C, wherein the process is a charge-discharge cycle process, and the discharge capacity at this time is the discharge capacity of the first cycle. The lithium ion secondary battery was subjected to 200 cycles of charge and discharge tests in accordance with the above-described method, and the discharge capacity per cycle was recorded, and the results are shown in table 1. The cycle capacity retention (%) was the discharge capacity at the 200 th cycle/the discharge capacity at the first cycle × 100%.
2. And (3) liquid absorption amount test: during testing, the diaphragm sample is cut into a certain size, soaked in the electrolyte for 0.5h at normal temperature, the weight difference of the diaphragm sample per unit area before and after soaking is the liquid absorption amount, and the result is recorded in table 1.
TABLE 1
Figure BDA0003340069140000071
As can be seen from the above Table 1, the secondary battery prepared by the preparation method of the present invention has better capacity retention rate and liquid absorption amount compared with the prior art, the capacity retention rate reaches 88% after 200 charge-discharge cycles, and the liquid absorption amount reaches 1.85mg/cm2Compared with comparative example 1, the capacity retention rate is improved by 12%, and the liquid absorption amount is improved by 242%.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (10)

1. The utility model provides a secondary battery, its characterized in that, includes positive plate, negative plate, diaphragm, electrolyte and casing, the diaphragm is used for separating positive plate with the negative plate, the casing is used for installing positive plate, negative plate, diaphragm and electrolyte, positive plate include the anodal mass flow body and set up in the anodal active material layer on the at least surface of anodal mass flow body, the negative plate include the negative current collector and set up in the negative active material layer on the at least surface of negative current collector, the anodal mass flow body with the negative current collector is carbon material film, carbon material film has porous structure.
2. The secondary battery according to claim 1, wherein the carbon material thin film is one of a carbon fiber thin film, a polytetrafluoroethylene film, or a carbon nanotube film metal composite film.
3. The secondary battery according to claim 2, wherein the carbon fiber thin film is prepared by: mixing and dissolving ferrocene and thiophene in a solvent according to a weight ratio of 2-10: 1-3 to obtain a mixed solution, placing the mixed solution in a cracking furnace, setting the cracking temperature to be 800-2000 ℃, and the cracking time to be 5-30 min to obtain the carbon fiber film.
4. The secondary battery according to claim 1, wherein the positive electrode active material layer includes a positive electrode active material having a core-shell structure.
5. The secondary battery according to claim 4, wherein the concentration of the positive electrode active material in the positive electrode active material layer decreases from the inside to the outside.
6. The secondary battery according to claim 5, wherein the concentration gradient of the positive electrode active material is 1% to 20%.
7. The secondary battery of claim 1, wherein the negative electrode active material layer comprises one or more negative electrode active materials of a carbon-based active material, a silicon-based active material, a tin-based active material, a nitrogen-containing active material, or an alloy-based active material.
8. The secondary battery of claim 7, wherein the negative electrode active material is a nano negative electrode active material.
9. The secondary battery according to claim 1, wherein the thickness of the positive electrode active material layer and/or the negative electrode active material layer is 4 μm to 18 μm.
10. The secondary battery according to claim 1, wherein the thickness of the positive electrode sheet and/or the negative electrode sheet is 10 μm to 50 μm.
CN202111305819.5A 2021-11-05 2021-11-05 Secondary battery Pending CN114122314A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111305819.5A CN114122314A (en) 2021-11-05 2021-11-05 Secondary battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111305819.5A CN114122314A (en) 2021-11-05 2021-11-05 Secondary battery

Publications (1)

Publication Number Publication Date
CN114122314A true CN114122314A (en) 2022-03-01

Family

ID=80380856

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111305819.5A Pending CN114122314A (en) 2021-11-05 2021-11-05 Secondary battery

Country Status (1)

Country Link
CN (1) CN114122314A (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1830102A (en) * 2003-07-31 2006-09-06 日产自动车株式会社 Secondary cell electrode and fabrication method, and secondary cell, complex cell, and vehicle
CN104064725A (en) * 2013-03-20 2014-09-24 罗伯特·博世有限公司 Electrode And Method For Maufacturing Same
CN110649266A (en) * 2019-09-09 2020-01-03 北京旭江科技有限公司 Lithium ion battery based on carbon nanotube film and preparation method thereof
CN111081993A (en) * 2018-10-18 2020-04-28 Sk新技术株式会社 Lithium secondary battery
CN111200108A (en) * 2018-11-16 2020-05-26 宁德时代新能源科技股份有限公司 Battery with a battery cell
CN111226330A (en) * 2017-11-21 2020-06-02 株式会社Lg化学 Positive electrode material for secondary battery and lithium secondary battery comprising same
CN112542583A (en) * 2019-09-23 2021-03-23 珠海冠宇电池股份有限公司 Positive electrode active material and high-voltage lithium ion battery comprising same
CN112993382A (en) * 2021-02-07 2021-06-18 珠海冠宇电池股份有限公司 Flexible solid-state battery

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1830102A (en) * 2003-07-31 2006-09-06 日产自动车株式会社 Secondary cell electrode and fabrication method, and secondary cell, complex cell, and vehicle
CN104064725A (en) * 2013-03-20 2014-09-24 罗伯特·博世有限公司 Electrode And Method For Maufacturing Same
CN111226330A (en) * 2017-11-21 2020-06-02 株式会社Lg化学 Positive electrode material for secondary battery and lithium secondary battery comprising same
CN111081993A (en) * 2018-10-18 2020-04-28 Sk新技术株式会社 Lithium secondary battery
CN111200108A (en) * 2018-11-16 2020-05-26 宁德时代新能源科技股份有限公司 Battery with a battery cell
CN110649266A (en) * 2019-09-09 2020-01-03 北京旭江科技有限公司 Lithium ion battery based on carbon nanotube film and preparation method thereof
CN112542583A (en) * 2019-09-23 2021-03-23 珠海冠宇电池股份有限公司 Positive electrode active material and high-voltage lithium ion battery comprising same
CN112993382A (en) * 2021-02-07 2021-06-18 珠海冠宇电池股份有限公司 Flexible solid-state battery

Similar Documents

Publication Publication Date Title
CN111312985A (en) Pole piece with porosity gradient distribution as well as preparation method and application thereof
CN111883725A (en) Lithium ion battery lithium supplement ceramic diaphragm and preparation method thereof
CN115441048B (en) Composite electrolyte with stable gradient distribution structure, battery and preparation method
CN115566170B (en) Preparation method of high-energy-density quick-charging lithium ion battery anode material
CN113964320A (en) Lithium ion battery and preparation method thereof
CN113314694A (en) High-rate lithium ion battery positive plate and preparation method thereof, and lithium ion battery
CN115377353A (en) Negative plate and battery using same
CN115207263A (en) Secondary battery
CN110635138A (en) Lithium ion battery pole piece and manufacturing method thereof
CN113270691A (en) Pole piece/diaphragm integrated lithium ion battery and preparation method thereof
CN111710829A (en) Preparation method of lithium ion battery
CN114792804B (en) 3D printing positive electrode ink, positive electrode forming method using same and application
CN116314590A (en) Sodium ion battery and preparation method thereof
CN113594461B (en) Carbon-silicon composite material and preparation method and application thereof
CN107452918B (en) Rare earth new power supply and preparation method thereof
CN113782705B (en) Positive plate of lithium ion battery, preparation method of positive plate and lithium ion battery
CN114784401A (en) Long-cycle-life lithium ion battery and method for prolonging cycle life of lithium ion battery
CN114512633A (en) Negative plate and battery comprising same
CN114122314A (en) Secondary battery
CN115172680A (en) High-capacity high-rate lithium ion battery and preparation method thereof
CN114709398A (en) Sulfur-containing fast ion conductor coated graphite composite material and preparation method thereof
CN112467123B (en) High-capacity lithium ion battery cathode material and preparation method thereof
CN115974114B (en) Quick-charging graphite composite material and preparation method thereof
CN113659135B (en) Application of iron sulfide in lithium iron phosphate secondary battery
CN114497438B (en) Negative plate and battery comprising same

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20220301