Lithium-ion battery application of a mesh current collector
By using a mesh current collector in lithium-ion batteries, the problems of small electrode specific surface area and uneven coating caused by traditional current collectors are solved, thereby improving battery energy density and low-temperature performance, and reducing manufacturing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN DATA POWER TECH LTD
- Filing Date
- 2025-07-04
- Publication Date
- 2026-07-21
AI Technical Summary
Traditional smooth current collectors in lithium-ion batteries result in problems such as small electrode specific surface area, high current density, increased polarization, low battery discharge capacity, uneven coating thickness, and high cost.
A mesh current collector is used, with through holes of 10-200μm diameter evenly spaced inside. The current collector is processed by laser ablation or chemical etching, with a hole density of 100-10000 holes/cm2. The inner wall of the through hole is smooth and burr-free, and the inside is filled with slurry to reduce the amount of binder and increase the proportion of active material.
It improves battery energy density, increases electrode specific surface area, reduces polarization, improves low-temperature performance, and reduces manufacturing costs.
Smart Images
Figure CN224537066U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of electrodes, specifically to a mesh current collector for lithium-ion batteries. Background Technology
[0002] In lithium-ion batteries, current collectors (such as copper or aluminum foil) serve as carriers for electrode active materials, and their surface properties directly affect battery performance.
[0003] Traditional smooth current collectors have the following problems:
[0004] 1. Using a smooth current collector requires adding more binder when making the electrode, which affects the improvement of battery energy density.
[0005] 2. A small electrode surface area results in a high current density, which in turn leads to increased polarization and low battery discharge capacity, especially under low temperature conditions, affecting normal use by consumers.
[0006] 3. The use of a valley-peak shaped coating layer results in uneven coating thickness due to the constant current collector. The reaction activity varies depending on the location. Areas with excessively thick coating layers may not react, affecting the battery's electrical performance.
[0007] 4. The peak-valley coating layer makes it impossible to control the compaction during the manufacturing process. Thick areas have high compaction and thin areas have low compaction, which can easily lead to low capacity or lithium plating.
[0008] 5. Processing the current collector into a valley-peak shape is costly. Utility Model Content
[0009] To address the shortcomings of existing technologies, this invention provides a mesh current collector for lithium-ion batteries, which solves the problems of electrodes affecting the improvement of battery energy density, impacting normal consumer use, and high manufacturing costs.
[0010] To achieve the above objectives, this utility model provides the following technical solution: a mesh current collector for lithium-ion batteries, comprising a current collector, wherein the current collector is a copper foil or aluminum foil substrate, and the current collector has multiple through holes spaced at equal intervals inside, wherein the pore diameter of the through holes is 10-200 μm and the pore density is 100-10000 holes / cm². 2 .
[0011] Preferably, the through holes are formed by laser ablation or chemical etching, and the inner sidewalls of the through holes are smooth and burr-free, thereby making the surface and interior of the current collector smooth and flat, and improving the efficiency of the current collector.
[0012] Preferably, the through-hole is filled with a slurry that adheres uniformly within it. Because the slurry adheres to the through-hole, it enhances the bonding force between the active material and the current collector, thereby reducing the amount of binder required. This helps to increase the ratio of positive and negative electrode active materials, thus improving the battery's energy density.
[0013] This invention provides a mesh current collector for lithium-ion batteries. It has the following advantages:
[0014] 1. The mesh current collector for lithium-ion batteries has uniformly distributed through holes when used, allowing the slurry to adhere to the through holes. This reduces the amount of binder required and increases the ratio of positive and negative electrode active materials, thereby improving the battery energy density.
[0015] 2. This lithium-ion battery uses a mesh current collector. When using a mesh current collector in a lithium-ion battery, the increased number of through holes increases the specific surface area of the electrode. Under the condition of constant external current, the current passing through the electrode per unit area decreases, effectively reducing electrochemical polarization (the phenomenon that the electrode potential deviates from the equilibrium potential under the condition of external current, as shown in the figure below. When the external current is larger, the overpotential is larger, the electrode potential deviates more from the equilibrium potential, the lower the electromotive force of the battery, and the smaller the output electrical energy), thereby improving the battery discharge capacity. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0017] Figure 2 This is a cross-sectional view of the present invention;
[0018] Figure 3 This is a comparison curve of the polarization performance of this utility model.
[0019] In the diagram, 1 represents the current collector and 2 represents the through hole. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] Please see Figure 1-2This utility model provides a mesh current collector for lithium-ion batteries, including a current collector 1, which is a copper foil or aluminum foil substrate. Multiple through holes 2 are evenly spaced inside the current collector 1. The pore diameter of the through holes 2 is 10-200 μm, and the pore density is 100-10000 holes / cm². 2 The through-hole 2 is formed by laser ablation or chemical etching, and the internal sidewalls of the through-hole 2 are smooth and burr-free. The inside of the through-hole 2 is filled with slurry, which is uniformly attached to the inside of the through-hole 2. The copper or aluminum foil of the current collector has multiple uniformly distributed through-holes, which are formed by laser ablation or chemical etching. The through-holes are processed on the current collector using laser ablation or mask etching process. Processing residues are cleaned to ensure that the inner wall of the through-hole is clean, smooth and burr-free, and to avoid the risk of short circuit. When the slurry is coated, part of the slurry fills the through-hole, increasing the contact area between the active material and the current collector. The through-hole structure reduces the amount of binder by 10%-30%, improves the energy density, increases the electrode specific surface area, reduces the local current density, reduces polarization, and improves low-temperature performance.
[0022] It should be noted that, in this embodiment, as Figure 1-2 As shown, the current collector (copper foil or aluminum foil) has multiple uniformly distributed through holes on its surface. The through holes are formed by laser ablation or chemical etching. The through holes are processed on the current collector using laser ablation or mask etching processes. Processing residues are cleaned to remove them, ensuring that the inner walls of the through holes are clean, smooth and burr-free, avoiding the risk of short circuits. When the slurry is coated, part of the slurry fills the through holes, increasing the contact area between the active material and the current collector. The through hole structure reduces the amount of binder used (reducing it by 10%-30%), improves the energy density, increases the electrode specific surface area, reduces the local current density, reduces polarization, and improves low-temperature performance.
[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0024] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A mesh current collector for lithium-ion batteries, characterized in that: The device includes a current collector (1), which is a copper foil or aluminum foil substrate. The current collector (1) has multiple through holes (2) evenly spaced inside. The diameter of the through holes (2) is 10-200 μm and the pore density is 100-10000 holes / cm. 2 .
2. The mesh current collector for lithium-ion batteries according to claim 1, characterized in that: The through hole (2) is formed by laser ablation or chemical etching, and the internal sidewalls of the through hole (2) are smooth and burr-free.
3. The mesh current collector for lithium-ion batteries according to claim 1, characterized in that: The through hole (2) is filled with slurry, which is uniformly attached to the inside of the through hole (2).