Novel lithium battery device based on mesocarbon microbeads as negative electrode material

Abstract

The utility model discloses a novel lithium battery device based on mesocarbon microbeads as a negative electrode material, which comprises a cuboid shell, a waterproof breathable film is arranged on the inner wall of the cuboid shell, and a first mesocarbon microbead cathode plate and a second mesocarbon microbead cathode plate are arranged in the cuboid shell. A lithium cobalt oxide anode plate is further arranged between the first mesocarbon microbead cathode plate and the second mesocarbon microbead cathode plate in the cuboid shell, and diaphragms are arranged among the first mesocarbon microbead cathode plate, the lithium cobalt oxide anode plate and the second mesocarbon microbead cathode plate; and the diaphragms among the first mesocarbon microbead cathode plate, the lithium cobalt oxide anode plate and the second mesocarbon microbead cathode plate are filled with lithium hexafluorophosphate electrolyte. The first mesocarbon microbead cathode plate, the lithium cobalt oxide anode plate and the second mesocarbon microbead cathode plate of the lithium ion battery are all coated with the conductive coatings, so that the electrode polarization is inhibited, the heat effect is reduced, and the battery performance is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium batteries, and specifically relates to a new type of lithium battery device using mesocarbon microbeads as the negative electrode material. Background Art

[0002] A lithium-ion battery is a new type of chemical power source that generates electrical energy through the redox reaction of lithium cobaltate as the positive electrode active material and mesocarbon microbeads as the negative electrode active material. It has a high energy density, good safety and environmental protection performance, and low electrode cost, and has been widely used in many fields. However, lithium-ion batteries cannot discharge at high currents, are expensive, have poor safety, etc. Moreover, lithium-ion batteries all require protection circuits to prevent overcharging and over-discharging of the battery, and the problem that the battery cannot dissipate heat in time during operation makes the performance of lithium-ion batteries poor. Summary of the Invention

[0003] In view of the deficiencies of the prior art, this utility model provides a new type of lithium battery device using mesocarbon microbeads as the negative electrode material, aiming to solve the problem that the heat dissipation performance of lithium batteries is poor during use, thus affecting the battery performance.

[0004] To achieve the above object, this utility model provides the following technical solution: A new type of lithium battery device using mesocarbon microbeads as the negative electrode material, including a cuboid housing, a waterproof and breathable membrane, a first mesocarbon microbead cathode sheet, a lithium cobaltate anode sheet, a second mesocarbon microbead cathode sheet, a separator, and a lithium hexafluorophosphate electrolyte. The inner wall of the cuboid housing is provided with a waterproof and breathable membrane. Inside the cuboid housing, there are a first mesocarbon microbead cathode sheet and a second mesocarbon microbead cathode sheet. Between the first mesocarbon microbead cathode sheet and the second mesocarbon microbead cathode sheet inside the cuboid housing, there is also a lithium cobaltate anode sheet. A separator is provided between the first mesocarbon microbead cathode sheet, the lithium cobaltate anode sheet, and the second mesocarbon microbead cathode sheet. The separator between the first mesocarbon microbead cathode sheet, the lithium cobaltate anode sheet, and the second mesocarbon microbead cathode sheet is filled with a lithium hexafluorophosphate electrolyte.

[0005] Further, the first mesocarbon microbead cathode sheet and the second mesocarbon microbead cathode sheet include a current collector, a catalyst layer, and a conductive coating; the current collectors of the first mesocarbon microbead cathode sheet and the second mesocarbon microbead cathode sheet are arranged on both sides inside the cuboid housing. On one side of the cuboid housing close to the current collector, there is a conductive coating, and on the other side close to the conductive coating inside the cuboid housing, there is a catalyst layer.

[0006] Further, the lithium cobaltate anode sheet includes a current collector and a lithium cobaltate plate; the current collector of the lithium cobaltate anode sheet is arranged in the middle part inside the cuboid housing, and lithium cobaltate plates are provided on both sides of the cuboid housing close to the current collector of the lithium cobaltate anode sheet.

[0007] Further, several multilayer embedded sealing rings are provided on the upper part of the current collectors of the first mesophase carbon microsphere cathode sheet, the lithium cobalt oxide anode sheet, and the second mesophase carbon microsphere cathode sheet. The upper part of the current collectors of the first mesophase carbon microsphere cathode sheet, the lithium cobalt oxide anode sheet, and the second mesophase carbon microsphere cathode sheet is used to pass through the cuboid housing and fit with the inside of the cuboid housing through the multilayer embedded sealing rings.

[0008] Further, the cuboid housing further includes a left pre-charge resistor and a right pre-charge resistor. The left pre-charge resistor and the right pre-charge resistor are provided on both sides of the lower part of the housing of the cuboid housing.

[0009] Further, the current collector, the catalyst layer, and the conductive coating are arranged in sequence from outside to inside.

[0010] Compared with the existing technology, the present utility model has the following beneficial effects: (1) The new lithium-ion battery device can block moisture and carbon dioxide in the air from entering the device through the waterproof and breathable membrane, preventing the lithium hexafluorophosphate electrolyte solution in the cuboid device from being diluted by the moisture in the air. (2) The first mesophase carbon microsphere cathode sheet, the lithium cobalt oxide anode sheet, and the second mesophase carbon microsphere cathode sheet of the lithium-ion battery are all coated with a conductive coating, which inhibits electrode polarization, reduces the thermal effect, and improves the battery performance. (3) The cuboid housing is made of diamond particle-reinforced copper-based heat dissipation material, enabling the lithium-ion battery to dissipate heat in time during operation, and the battery performance is more excellent; (4) The first mesophase carbon microsphere cathode sheet, the lithium cobalt oxide anode sheet, and the second mesophase carbon microsphere cathode sheet are all fitted with the inside of the cuboid housing through multilayer embedded sealing rings, further preventing electrolyte leakage. (5) The first mesophase carbon microsphere cathode sheet and the second mesophase carbon microsphere cathode sheet of the lithium-ion battery adopt the modified mesophase carbon microsphere O’MCMB\(CuCl2 - SiO2) material, which greatly improves the capacity of the lithium-ion negative electrode material and extends the battery life. Description of the Drawings

[0011] Figure 1 It is a plan view of the lithium battery device of the present utility model.

[0012] Figure 2 It is a side view of the lithium battery device of the present utility model.

[0013] Reference numerals in the drawings: 1. Cuboid housing; 2. Waterproof and breathable membrane; 3. First mesophase carbon microsphere cathode sheet; 4. Lithium cobalt oxide anode sheet; 5. Second mesophase carbon microsphere cathode sheet; 6. Diaphragm; 7. Multilayer embedded sealing ring; 8. Lithium hexafluorophosphate electrolyte; 9. Current collector; 10. Catalyst layer; 11. Conductive coating; 12. Lithium cobalt oxide plate; 13. Left pre-charge resistor; 14. Right pre-charge resistor. Detailed Embodiments

[0014] Such as Figure 1 - Figure 2As shown in the figure; the present utility model provides a technical solution: a novel lithium battery device based on mesophase carbon microspheres as the negative electrode material, including a cuboid outer shell 1, a waterproof and breathable membrane 2, a first mesophase carbon microsphere cathode sheet 3, a lithium cobalt oxide anode sheet 4, a second mesophase carbon microsphere cathode sheet 5, a separator 6, and a lithium hexafluorophosphate electrolyte 8; a waterproof and breathable membrane 2 is provided on the inner wall of the cuboid outer shell 1, a first mesophase carbon microsphere cathode sheet 3 and a second mesophase carbon microsphere cathode sheet 5 are provided inside the cuboid outer shell 1, a lithium cobalt oxide anode sheet 4 is further provided between the first mesophase carbon microsphere cathode sheet 3 and the second mesophase carbon microsphere cathode sheet 5 inside the cuboid outer shell 1, a PE separator 6 is provided between the first mesophase carbon microsphere cathode sheet 3, the lithium cobalt oxide anode sheet 4, and the second mesophase carbon microsphere cathode sheet 5, and the separator 6 between the first mesophase carbon microsphere cathode sheet 3, the lithium cobalt oxide anode sheet 4, and the second mesophase carbon microsphere cathode sheet 5 is filled with a lithium hexafluorophosphate electrolyte 8; the lithium hexafluorophosphate electrolyte 8 inside the battery occupies 2 / 3 - 3 / 4 of the internal volume of the battery.

[0015] Among them, the first mesophase carbon microsphere cathode sheet 3 and the second mesophase carbon microsphere cathode sheet 5 include a current collector 9, a catalyst layer 10, and a conductive coating 11; the current collectors 9 of the first mesophase carbon microsphere cathode sheet 3 and the second mesophase carbon microsphere cathode sheet 5 are arranged on both sides inside the cuboid outer shell 1, a conductive coating 11 is provided on one side inside the cuboid outer shell 1 close to the current collector 9, and a catalyst layer 10 is provided on the other side inside the cuboid outer shell 1 close to the conductive coating 11; and the current collector 9, the catalyst layer 10, and the conductive coating 11 are arranged in sequence from the outside to the inside.

[0016] Among them, the lithium cobalt oxide anode sheet 4 includes a current collector 9 and a lithium cobalt oxide plate 12; the current collector 9 of the lithium cobalt oxide anode sheet 4 is arranged in the middle inside the cuboid outer shell 1, and lithium cobalt oxide plates 12 are provided on both sides inside the cuboid outer shell 1 close to the current collector 9 of the lithium cobalt oxide anode sheet 4.

[0017] Among them, several multi-layer embedded sealing rings 7 are provided on the upper part of the current collectors 9 of the first mesophase carbon microsphere cathode sheet 3, the lithium cobalt oxide anode sheet 4, and the second mesophase carbon microsphere cathode sheet 5. The upper part of the current collectors 9 of the first mesophase carbon microsphere cathode sheet 3, the lithium cobalt oxide anode sheet 4, and the second mesophase carbon microsphere cathode sheet 5 are used to pass through the cuboid outer shell 1 and fit with the inside of the cuboid outer shell 1 through the multi-layer embedded sealing rings 7.

[0018] Among them, the cuboid outer shell 1 further includes a left pre-charge resistor 13 and a right pre-charge resistor 14, and the left pre-charge resistor 13 and the right pre-charge resistor 14 are provided on both sides of the lower part of the outer shell of the cuboid outer shell 1.

[0019] Among them, the cuboid outer shell 1 is made of diamond particle-reinforced copper-based heat dissipation material and is chrome-plated on the inside.

[0020] Among them, the conductive coating materials of the positive and negative electrodes of the battery electrode 11 are selected as graphene materials.

[0021] Among them, the waterproof and breathable membrane 2 is made of polytetrafluoroethylene material.

[0022] Among them, the first mesophase carbon microsphere cathode sheet 3 and the second mesophase carbon microsphere cathode sheet 5 are selected as the modified mesophase carbon microsphere O’MCMB\((CuCl2 - SiO2)\) material plate.

[0023] Among them, the lithium cobalt oxide anode sheet 4 is selected as the lithium cobalt oxide plate 12.

[0024] Among them, the separator 6 is made of polyethylene material.

[0025] Among them, the multi-layer embedded sealing ring 7 is made of nylon material.

[0026] Among them, the electrolyte of the battery is selected as the lithium hexafluorophosphate electrolyte 8.

[0027] Working principle: During charging, the lithium battery device is connected to the power supply, and lithium ions are released from the lithium cobalt oxide anode sheet 4. The lithium ions move through the lithium hexafluorophosphate electrolyte 8 to the first mesophase carbon microsphere cathode sheet 3 and the second mesophase carbon microsphere cathode sheet 5; the mesophase carbon microsphere material of the first mesophase carbon microsphere cathode sheet 3 and the second mesophase carbon microsphere cathode sheet 5 has a layered structure, and there are many micropores in the first mesophase carbon microsphere cathode sheet 3 and the second mesophase carbon microsphere cathode sheet 5. The lithium ions reaching the first mesophase carbon microsphere cathode sheet 3 and the second mesophase carbon microsphere cathode sheet 5 are embedded in the micropores of the first mesophase carbon microsphere cathode sheet 3 and the second mesophase carbon microsphere cathode sheet 5. The more lithium ions are embedded, the higher the charging capacity; when working, the lithium battery device is connected to the electrical appliance, and the lithium ions embedded in the first mesophase carbon microsphere cathode sheet 3 and the second mesophase carbon microsphere cathode sheet 5 are released and move back to the lithium cobalt oxide anode sheet 4 through the lithium hexafluorophosphate electrolyte 8; this process repeats to complete the charge and discharge process of the lithium battery.

[0028] By using the diamond particle-reinforced copper-based heat dissipation material as the cuboid shell 1, the heat dissipation efficiency of the lithium battery is greatly improved, making its operation more stable and performance more excellent. At the same time, it solves the problem of insufficient conductivity of the first mesophase carbon microsphere cathode sheet 3 and the second mesophase carbon microsphere cathode sheet 5, which affects the output efficiency of the battery, and improves the energy density of the lithium battery; and through the fitting of the multi-layer embedded sealing ring 7 with the inside of the cuboid shell 1, the leakage problem of the lithium hexafluorophosphate electrolyte 8 is further solved; at the same time, through the waterproof and breathable membrane 2, it also solves the problem that oxygen in the air usually carries moisture and carbon dioxide when entering the inside of the lithium battery, which affects the service life of the lithium battery; and the left pre-charge resistor 13 and the right pre-charge resistor 14 can effectively control the current output speed of the lithium battery and improve the safety of the battery.

[0029] Although the embodiments of the present utility have been shown and described; for those of ordinary skill in the art; it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility; the scope of the present utility is defined by the appended claims and their equivalents.

Claims

1. A novel lithium battery device based on mesophase carbon microspheres as negative electrode materials, comprising a rectangular shell (1), a waterproof breathable membrane (2), a first mesophase carbon microsphere cathode sheet (3), a lithium cobalt oxide anode sheet (4), a second mesophase carbon microsphere cathode sheet (5), a diaphragm (6) and a lithium hexafluorophosphate electrolyte (8), characterized in that: The inner wall of the rectangular shell (1) is provided with a waterproof and breathable membrane (2); a first mesophase carbon microsphere cathode sheet (3) and a second mesophase carbon microsphere cathode sheet (5) are provided inside the rectangular shell (1); a lithium cobalt oxide anode sheet (4) is provided between the first mesophase carbon microsphere cathode sheet (3) and the second mesophase carbon microsphere cathode sheet (5) inside the rectangular shell (1); a diaphragm (6) is provided between the first mesophase carbon microsphere cathode sheet (3), the lithium cobalt oxide anode sheet (4) and the second mesophase carbon microsphere cathode sheet (5); and the diaphragm (6) between the first mesophase carbon microsphere cathode sheet (3), the lithium cobalt oxide anode sheet (4) and the second mesophase carbon microsphere cathode sheet (5) is filled with a lithium hexafluorophosphate electrolyte (8).

2. A novel lithium battery device based on mesophase carbon microspheres as negative electrode material according to claim 1, characterized in that: The first mesophase carbon microsphere cathode sheet (3) and the second mesophase carbon microsphere cathode sheet (5) comprise a current collector (9), a catalyst layer (10) and a conductive coating (11); the current collectors (9) of the first mesophase carbon microsphere cathode sheet (3) and the second mesophase carbon microsphere cathode sheet (5) are arranged on both sides of the inside of a rectangular parallelepiped shell (1), a conductive coating (11) is provided on one side of the inside of the rectangular parallelepiped shell (1) close to the current collector (9), and a catalyst layer (10) is provided on the other side of the inside of the rectangular parallelepiped shell (1) close to the conductive coating (11).

3. A novel lithium battery device based on mesophase carbon microspheres as negative electrode material according to claim 2, characterized in that: The lithium cobalt oxide anode sheet (4) comprises a current collector (9) and a lithium cobalt oxide plate (12); the current collector (9) of the lithium cobalt oxide anode sheet (4) is arranged in the middle of the rectangular shell (1), and the lithium cobalt oxide plates (12) are arranged on both sides of the current collector (9) close to the lithium cobalt oxide anode sheet (4) inside the rectangular shell (1).

4. A novel lithium battery device based on mesophase carbon microspheres as negative electrode material according to claim 3, characterized in that: A plurality of multi-layer embedded sealing rings (7) are provided on the upper part of the current collector (9) of the first mesophase carbon microsphere cathode sheet (3), the lithium cobalt oxide anode sheet (4) and the second mesophase carbon microsphere cathode sheet (5); the upper part of the current collector (9) of the first mesophase carbon microsphere cathode sheet (3), the lithium cobalt oxide anode sheet (4) and the second mesophase carbon microsphere cathode sheet (5) is used to pass through the rectangular outer shell (1) and is fitted with the inside of the rectangular outer shell (1) through the multi-layer embedded sealing rings (7).

5. A novel lithium battery device based on mesophase carbon microspheres as negative electrode material according to claim 4, characterized in that: The rectangular parallelepiped housing (1) further comprises a left pre-charging resistor (13) and a right pre-charging resistor (14); the left pre-charging resistor (13) and the right pre-charging resistor (14) are both provided on both sides of the lower part of the rectangular parallelepiped housing (1).

6. A novel lithium battery device based on mesophase carbon microspheres as negative electrode material according to claim 5, characterized in that: The current collector (9), the catalyst layer (10) and the conductive coating (11) are arranged in sequence from the outside to the inside.

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