All-solid-state thin film lithium battery

Abstract

The utility model discloses an all-solid-state film lithium battery which comprises an anode current collector layer, an anode tab connected with the anode current collector layer and a composite module arranged on the anode current collector layer, wherein the composite module comprises a negative electrode tab, an insulation barrier layer, and a positive electrode layer, a solid electrolyte layer, a negative electrode layer and a packaging protection film coating layer which are stacked in sequence, the positive electrode layer and the insulation barrier layer are arranged on the positive electrode current collector layer, the insulation barrier layer is arranged on one side of the positive electrode layer, and the packaging protection film coating layer is arranged on the other side of the solid electrolyte layer. The solid electrolyte layer covers the positive electrode layer and the insulating barrier layer, the negative electrode layer is arranged on the solid electrolyte layer, and the packaging protective coating layer covers the outer sides of the negative electrode layer and the solid electrolyte layer. According to the utility model, the packaging protection coating layer is used for packaging, so that the thickness of the packaging layer can be reduced, the integration level of the battery is improved, and the packaging protection coating layer is high in fitting tightness, so that the packaging requirement can be met.

Description

Technical Field

[0001] The utility model relates to an all-solid-state thin-film lithium battery. Background Art

[0002] At present, all-solid-state thin-film lithium battery is the next generation of lithium battery technology, with the advantages of high energy density, wide temperature range, long cycle life and high safety, and has broad application prospects in the field of micro-electromechanical and 3C digital products. Battery packaging is one of the key processes in the production of all-solid-state thin-film lithium batteries, and the aluminum-plastic film packaging method is widely used in the packaging process of batteries. For example, a Chinese patent with publication number CN113793977B discloses an all-solid-state lithium-ion battery, which is packaged with aluminum-plastic film. However, aluminum-plastic film packaging has the disadvantages of large packaging layer thickness, loose fit between the aluminum-plastic film and the battery body, and poor battery integration, which cannot meet the packaging requirements of all-solid-state thin-film lithium batteries. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide an all-solid-state thin-film lithium battery, which adopts a packaging protective coating layer for packaging, can reduce the thickness of the packaging layer, improve the battery integration, and the packaging protective coating layer has a high degree of tightness and can meet the packaging requirements.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: an all-solid-state thin-film lithium battery, which includes a positive electrode current collector layer, a positive electrode tab connected to the positive electrode current collector layer, and a composite module arranged on the positive electrode current collector layer;

[0005] The composite module comprises a negative electrode tab, an insulating barrier layer, and a positive electrode layer, a solid electrolyte layer, a negative electrode layer and a packaging protective coating layer stacked in sequence;

[0006] The positive electrode layer and the insulating barrier layer are both arranged on the positive electrode current collector layer, and the insulating barrier layer is arranged on one side of the positive electrode layer;

[0007] The solid electrolyte layer covers the positive electrode layer and the insulating barrier layer;

[0008] The negative electrode layer is disposed on the solid electrolyte layer, and the negative electrode layer and the positive electrode layer are separated by the solid electrolyte layer;

[0009] The encapsulation protection coating layer wraps and covers the outer sides of the negative electrode layer and the solid electrolyte layer;

[0010] One end of the negative electrode tab is located between the solid electrolyte layer and the packaging protection coating layer and is connected to the negative electrode layer;

[0011] The insulating barrier layer is disposed between the negative electrode tab and the positive electrode current collector layer, so that the negative electrode tab is isolated from the positive electrode layer and the positive electrode current collector layer respectively.

[0012] Furthermore, the encapsulation protection coating layer is a polyparaxylene film or a polyamide-imide film.

[0013] Furthermore, the encapsulation protection coating layer is magnetron sputtered on the outer sides of the negative electrode layer and the solid electrolyte layer, and / or the thickness of the encapsulation protection coating layer is 10-20 μm.

[0014] A specific structure of the positive electrode current collector layer is further provided, wherein the material of the positive electrode current collector layer is aluminum foil, and / or the positive electrode tab and the positive electrode current collector layer are integrated.

[0015] A specific structure of the negative electrode tab is further provided, wherein the negative electrode tab is a conductive copper foil with adhesive, and the negative electrode tab is bonded and connected to the negative electrode layer.

[0016] Furthermore, one end of the insulating barrier layer is in contact with the positive electrode layer, and / or the insulating barrier layer is made of UV photosensitive adhesive.

[0017] Furthermore, the area of ​​the negative electrode layer is smaller than the area of ​​the solid electrolyte layer, the negative electrode layer is a metal lithium film, and the solid electrolyte layer is a lithium nitride phosphate film.

[0018] Furthermore, the thickness of the positive electrode current collector layer is 10-12 μm, the thickness of the positive electrode layer and the insulating barrier layer are both 10-120 μm, the thickness of the solid electrolyte layer is 1-2 μm, and the thickness of the negative electrode layer is 5-10 μm.

[0019] A composite module arrangement structure is further provided, wherein the composite module is arranged on one side surface of the positive electrode current collector layer.

[0020] Another arrangement structure of a composite module is further provided, wherein the composite modules are respectively arranged on both side surfaces of the positive electrode current collector layer.

[0021] After adopting the above technical solution, the present patent application avoids the use of aluminum-plastic film for packaging, but instead sets a packaging protective coating layer on the outside of the negative electrode layer and the solid electrolyte layer for packaging. The packaging protective coating layer has a dense structure and can effectively isolate water and oxygen, playing a good protective role. In addition, the use of the packaging protective coating layer can not only reduce the thickness of the packaging layer and improve the battery integration, but also the packaging protective coating layer has a higher degree of tightness, which can meet the packaging requirements of all-solid-state thin-film lithium batteries. In addition, by setting the insulating barrier layer, the negative electrode tab can be separated from the positive electrode layer and the positive electrode collector layer respectively, thereby effectively preventing the negative electrode tab from short-circuiting with the positive electrode layer, thereby realizing the integrated design of the positive electrode tab and the negative electrode tab, and further improving the battery integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of an all-solid-state thin-film lithium battery in Embodiment 1 of the present utility model;

[0023] Figure 2 It is a schematic structural diagram of the positive electrode current collector layer and the positive electrode tab in the utility model;

[0024] Figure 3 The schematic diagram of the structure of the positive electrode layer and the insulating barrier layer prepared in the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of a solid electrolyte layer prepared in the utility model;

[0026] Figure 5 The schematic diagram of the structure of the negative electrode layer and the negative electrode tab prepared in the utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the encapsulation protective coating layer prepared in the utility model;

[0028] Figure 7 This is a schematic diagram of the structure of an all-solid-state thin-film lithium battery in Embodiment 2 of the present utility model. DETAILED DESCRIPTION

[0029] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0030] Embodiment 1

[0031] like Figures 1 to 6 As shown, an all-solid-state thin-film lithium battery comprises a positive electrode current collector layer 1, a positive electrode tab 2 connected to the positive electrode current collector layer 1, and a composite module 100 disposed on the positive electrode current collector layer 1;

[0032] In this embodiment, the composite module 100 is provided only on one side surface of the positive electrode current collector layer 1;

[0033] The composite module 100 comprises a negative electrode tab 3, an insulating barrier layer 4, and a positive electrode layer 5, a solid electrolyte layer 6, a negative electrode layer 7 and a packaging protective coating layer 8 which are stacked in sequence;

[0034] The positive electrode layer 5 and the insulating barrier layer 4 are both disposed on the positive electrode current collector layer 1, and the insulating barrier layer 4 is disposed on one side of the positive electrode layer 5;

[0035] The solid electrolyte layer 6 covers the positive electrode layer 5 and the insulating barrier layer 4;

[0036] The negative electrode layer 7 is disposed on the solid electrolyte layer 6, and the negative electrode layer 7 is separated from the positive electrode layer 5 by the solid electrolyte layer 6;

[0037] The encapsulation protection coating layer 8 wraps and covers the outer sides of the negative electrode layer 7 and the solid electrolyte layer 6;

[0038] One end of the negative electrode tab 3 is located between the solid electrolyte layer 6 and the packaging protection coating layer 8 and is connected to the negative electrode layer 7;

[0039] The insulating barrier layer 4 is arranged between the negative electrode tab 3 and the positive electrode current collector layer 1, so that the negative electrode tab 3 is separated from the positive electrode layer 5 and the positive electrode current collector layer 1 respectively. Specifically, in this embodiment, the use of aluminum plastic film for packaging is avoided, but an encapsulation protection coating layer 8 is provided on the outside of the negative electrode layer 7 and the solid electrolyte layer 6 for packaging. The encapsulation protection coating layer 8 has a dense structure and can effectively isolate water and oxygen, playing a good protective role. In addition, the use of the encapsulation protection coating layer 8 can not only reduce the thickness of the encapsulation layer and improve the battery integration, but also the encapsulation protection coating layer 8 has a higher degree of fit, which can meet the packaging requirements of all-solid-state thin film lithium batteries. More specifically, by providing the insulating barrier layer 4, the negative electrode tab 3 can be separated from the positive electrode layer 5 and the positive electrode current collector layer 1 respectively, thereby effectively preventing the negative electrode tab 3 from short-circuiting with the positive electrode layer 5, thereby realizing the integrated design of the positive electrode tab 2 and the negative electrode tab 3, and further improving the battery integration.

[0040] In this embodiment, the encapsulation protection coating layer 8 is a polyparaxylene film; specifically, the encapsulation protection coating layer 8 has a dense structure and good water and oxygen isolation ability, which can effectively prevent the metal lithium in the negative electrode layer 7 from reacting with water and oxygen in the air, effectively isolate the damage of water and oxygen in the air to the battery, and avoid battery failure. In addition, the encapsulation protection coating layer 8 can be tightly attached to the negative electrode layer 7, the solid electrolyte layer 6 and the negative electrode tab 3, and it is easy to achieve large-scale preparation.

[0041] like Figure 1 , 5 6, the encapsulation protection coating layer 8 is magnetron sputtered on the outside of the negative electrode layer 7 and the solid electrolyte layer 6. In this embodiment, it is only necessary to prepare the encapsulation protection coating layer 8 by magnetron sputtering on the outside of the negative electrode layer 7 and the solid electrolyte layer 6 to achieve effective protection, and obtain the advantages of small thickness of the encapsulation layer, high battery integration, and tighter fitting, which effectively meets the packaging requirements of all-solid-state thin-film lithium batteries. Specifically, the thickness of the encapsulation protection coating layer 8 can be 10 to 20 μm; in this embodiment, the thickness of the encapsulation protection coating layer 8 is 10 μm.

[0042] like Figure 1 , 2 As shown, the material of the positive electrode current collector layer 1 can be aluminum foil, and the positive electrode tab 2 and the positive electrode current collector layer 1 are integrated.

[0043] like Figure 1 , 5 As shown, the negative electrode tab 3 can be a conductive copper foil with adhesive, and the negative electrode tab 3 is bonded and connected to the negative electrode layer 7; in this embodiment, the thickness of the negative electrode tab 3 is 20 μm.

[0044] like Figure 1 , 3 As shown, one end of the insulating barrier layer 4 is in contact with the positive electrode layer 5 , and the material of the insulating barrier layer 4 can be UV photosensitive adhesive.

[0045] like Figure 1 , 5 As shown, the area of ​​the negative electrode layer 7 is smaller than the area of ​​the solid electrolyte layer 6; in this embodiment, the negative electrode layer 7 is a metal lithium film, and the solid electrolyte layer 6 is a lithium nitride phosphate film.

[0046] like Figure 1As shown, the thickness of the positive electrode collector layer 1 can be 10-12 μm, the thickness of the positive electrode layer 5 and the insulating barrier layer 4 can both be 10-120 μm, the thickness of the solid electrolyte layer 6 can be 1-2 μm, and the thickness of the negative electrode layer 7 can be 5-10 μm; in this embodiment, the thickness of the positive electrode collector layer 1 is 10 μm, the thickness of the positive electrode layer 5 and the insulating barrier layer 4 are both 10 μm, the thickness of the solid electrolyte layer 6 is 1 μm, and the thickness of the negative electrode layer 7 is 5 μm.

[0047] In this embodiment, firstly, the positive electrode current collector layer 1 is prepared, and the positive electrode layer 5 and the insulating barrier layer 4 are prepared on the positive electrode current collector layer 1, and the positive electrode layer 5 and the insulating barrier layer 4 are in the same plane and have the same thickness; then the solid electrolyte layer 6 is prepared, and the area of ​​the solid electrolyte layer 6 is larger than the positive electrode layer 5 plus the insulating barrier layer 4, and the solid electrolyte layer 6 completely covers the positive electrode layer 5 and the insulating barrier layer 4; then the negative electrode layer 7 is deposited on the solid electrolyte layer 6, and the area of ​​the negative electrode layer 7 is smaller than the solid electrolyte layer 6, and then the negative electrode tab 3 is pasted and overlapped on the negative electrode layer 7, and finally the encapsulation protection coating layer 8 is prepared, so that the encapsulation protection coating layer 8 is wrapped and covered on the outside of the negative electrode layer 7 and the solid electrolyte layer 6. Specifically, the positive electrode layer 5 is prepared by a mechanical coating process, the insulating barrier layer 4 is prepared by coating a UV photosensitive adhesive, the solid electrolyte layer 6 is prepared by a magnetron sputtering method, and the negative electrode layer 7 is prepared by a vacuum thermal evaporation method.

[0048] Embodiment 2

[0049] like Figures 2 to 7 As shown, another all-solid-state thin-film lithium battery comprises a positive electrode current collector layer 1, a positive electrode tab 2 connected to the positive electrode current collector layer 1, and a composite module 100 disposed on the positive electrode current collector layer 1;

[0050] In this embodiment, the composite modules 100 are respectively provided on both side surfaces of the positive electrode current collector layer 1;

[0051] The composite module 100 comprises a negative electrode tab 3, an insulating barrier layer 4, and a positive electrode layer 5, a solid electrolyte layer 6, a negative electrode layer 7 and a packaging protective coating layer 8 which are stacked in sequence;

[0052] The positive electrode layer 5 and the insulating barrier layer 4 are both disposed on the positive electrode current collector layer 1, and the insulating barrier layer 4 is disposed on one side of the positive electrode layer 5;

[0053] The solid electrolyte layer 6 covers the positive electrode layer 5 and the insulating barrier layer 4;

[0054] The negative electrode layer 7 is disposed on the solid electrolyte layer 6, and the negative electrode layer 7 is separated from the positive electrode layer 5 by the solid electrolyte layer 6;

[0055] The encapsulation protection coating layer 8 wraps and covers the outer sides of the negative electrode layer 7 and the solid electrolyte layer 6;

[0056] One end of the negative electrode tab 3 is located between the solid electrolyte layer 6 and the packaging protection coating layer 8 and is connected to the negative electrode layer 7;

[0057] The insulating barrier layer 4 is arranged between the negative electrode tab 3 and the positive electrode current collector layer 1, so that the negative electrode tab 3 is separated from the positive electrode layer 5 and the positive electrode current collector layer 1 respectively. Specifically, in this embodiment, the use of aluminum plastic film for packaging is avoided, but an encapsulation protection coating layer 8 is provided on the outside of the negative electrode layer 7 and the solid electrolyte layer 6 for packaging. The encapsulation protection coating layer 8 has a dense structure and can effectively isolate water and oxygen, playing a good protective role. In addition, the use of the encapsulation protection coating layer 8 can not only reduce the thickness of the encapsulation layer and improve the battery integration, but also the encapsulation protection coating layer 8 has a higher degree of fit, which can meet the packaging requirements of all-solid-state thin film lithium batteries. More specifically, by providing the insulating barrier layer 4, the negative electrode tab 3 can be separated from the positive electrode layer 5 and the positive electrode current collector layer 1 respectively, thereby effectively preventing the negative electrode tab 3 from short-circuiting with the positive electrode layer 5, thereby realizing the integrated design of the positive electrode tab 2 and the negative electrode tab 3, and further improving the battery integration.

[0058] In this embodiment, the encapsulation protection coating layer 8 is a polyamide-imide film; specifically, the encapsulation protection coating layer 8 has a dense structure and good water and oxygen isolation ability, which can effectively prevent the metal lithium in the negative electrode layer 7 from reacting with water and oxygen in the air, effectively isolate the damage of water and oxygen in the air to the battery, and avoid battery failure. In addition, the encapsulation protection coating layer 8 can be tightly attached to the negative electrode layer 7, the solid electrolyte layer 6 and the negative electrode tab 3, and it is easy to achieve large-scale preparation.

[0059] like Figure 5 , 6 As shown in Figures 7 and 8, the encapsulation protection coating layer 8 is magnetron sputtered on the outside of the negative electrode layer 7 and the solid electrolyte layer 6. In this embodiment, only the encapsulation protection coating layer 8 needs to be magnetron sputtered on the outside of the negative electrode layer 7 and the solid electrolyte layer 6 to achieve effective protection, and obtain the advantages of small thickness of the encapsulation layer, high battery integration, and tighter fitting, which effectively meets the packaging requirements of all-solid-state thin-film lithium batteries. In this embodiment, the thickness of the encapsulation protection coating layer 8 is 20μm.

[0060] like Figure 2 , 7As shown, the material of the positive electrode current collector layer 1 can be aluminum foil, and the positive electrode tab 2 and the positive electrode current collector layer 1 are integrated.

[0061] like Figure 5 , 7 As shown, the negative electrode tab 3 can be a conductive copper foil with adhesive, and the negative electrode tab 3 is bonded and connected to the negative electrode layer 7; in this embodiment, the thickness of the negative electrode tab 3 is 20 μm.

[0062] like Figure 3 , 7 As shown, one end of the insulating barrier layer 4 is in contact with the positive electrode layer 5 , and the material of the insulating barrier layer 4 can be UV photosensitive adhesive.

[0063] like Figure 5 , 7 As shown, the area of ​​the negative electrode layer 7 is smaller than the area of ​​the solid electrolyte layer 6; in this embodiment, the negative electrode layer 7 is a metal lithium film, and the solid electrolyte layer 6 is a lithium nitride phosphate film.

[0064] In this embodiment, the thickness of the positive electrode current collector layer 1 is 12 μm, the thickness of the positive electrode layer 5 and the insulating barrier layer 4 are both 120 μm, the thickness of the solid electrolyte layer 6 is 2 μm, and the thickness of the negative electrode layer 7 is 10 μm.

[0065] In summary, the present patent application avoids the use of aluminum-plastic film for packaging, but instead sets a packaging protective coating layer 8 on the outside of the negative electrode layer 7 and the solid electrolyte layer 6 for packaging. The packaging protective coating layer 8 has a dense structure and can effectively isolate water and oxygen, playing a good protective role. In addition, the use of the packaging protective coating layer 8 can not only reduce the thickness of the packaging layer and improve the battery integration, but also the packaging protective coating layer 8 has a higher degree of tightness, which can meet the packaging requirements of all-solid-state thin-film lithium batteries. In addition, by setting the insulating barrier layer 4, the negative electrode tab 3 can be separated from the positive electrode layer 5 and the positive electrode collector layer 1 respectively, thereby effectively preventing the negative electrode tab 3 from short-circuiting with the positive electrode layer 5, thereby realizing the integrated design of the positive electrode tab 2 and the negative electrode tab 3, and further improving the battery integration.

[0066] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An all-solid-state thin-film lithium battery, characterized in that: It comprises a positive electrode current collector layer (1), a positive electrode tab (2) connected to the positive electrode current collector layer (1), and a composite module (100) arranged on the positive electrode current collector layer (1); The composite module (100) comprises a negative electrode tab (3), an insulating barrier layer (4), and a positive electrode layer (5), a solid electrolyte layer (6), a negative electrode layer (7), and a packaging protective coating layer (8) which are stacked in sequence; The positive electrode layer (5) and the insulating barrier layer (4) are both arranged on the positive electrode current collector layer (1), and the insulating barrier layer (4) is arranged on one side of the positive electrode layer (5); The solid electrolyte layer (6) covers the positive electrode layer (5) and the insulating barrier layer (4); The negative electrode layer (7) is arranged on the solid electrolyte layer (6), and the negative electrode layer (7) and the positive electrode layer (5) are separated by the solid electrolyte layer (6); The encapsulation protection coating layer (8) wraps and covers the outer sides of the negative electrode layer (7) and the solid electrolyte layer (6); One end of the negative electrode tab (3) is located between the solid electrolyte layer (6) and the packaging protective coating layer (8) and is connected to the negative electrode layer (7); The insulating barrier layer (4) is arranged between the negative electrode tab (3) and the positive electrode current collector layer (1) so as to isolate the negative electrode tab (3) from the positive electrode layer (5) and the positive electrode current collector layer (1) respectively.

2. The all-solid-state thin-film lithium battery according to claim 1, characterized in that: The packaging protection coating layer (8) is a polyparaxylene film or a polyamide-imide film.

3. The all-solid-state thin-film lithium battery according to claim 1, characterized in that: The packaging protective coating layer (8) is magnetron sputtered on the outer sides of the negative electrode layer (7) and the solid electrolyte layer (6), and / or the packaging protective coating layer (8) has a thickness of 10 to 20 μm.

4. The all-solid-state thin-film lithium battery according to claim 1, characterized in that: The material of the positive electrode current collector layer (1) is aluminum foil, and / or the positive electrode tab (2) and the positive electrode current collector layer (1) are integrally formed.

5. The all-solid-state thin-film lithium battery according to claim 1, characterized in that: The negative electrode tab (3) is a conductive copper foil with adhesive, and the negative electrode tab (3) is connected to the negative electrode layer (7) by gluing.

6. The all-solid-state thin-film lithium battery according to claim 1, characterized in that: One end of the insulating barrier layer (4) is in contact with the positive electrode layer (5), and / or the insulating barrier layer (4) is made of UV photosensitive adhesive.

7. The all-solid-state thin-film lithium battery according to claim 1, characterized in that: The area of ​​the negative electrode layer (7) is smaller than the area of ​​the solid electrolyte layer (6); the negative electrode layer (7) is a metal lithium thin film, and the solid electrolyte layer (6) is a nitrided lithium phosphate thin film.

8. The all-solid-state thin-film lithium battery according to claim 1, characterized in that: The thickness of the positive electrode current collector layer (1) is 10 to 12 μm, the thickness of the positive electrode layer (5) and the insulating barrier layer (4) are both 10 to 120 μm, the thickness of the solid electrolyte layer (6) is 1 to 2 μm, and the thickness of the negative electrode layer (7) is 5 to 10 μm.

9. The all-solid-state thin-film lithium battery according to claim 1, characterized in that: The composite module (100) is provided on one side surface of the positive electrode current collector layer (1).

10. The all-solid-state thin-film lithium battery according to claim 1, characterized in that: The composite modules (100) are respectively arranged on both side surfaces of the positive electrode current collector layer (1).

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