9V rechargeable battery

　　Technology development trends of copper foil, the key material for 9V rechargeable battery

　　Technology development trends of copper foil, the key material for 9V rechargeable battery. Copper foil is one of the key materials for the production of lithium-ion batteries, and its quality directly affects the battery process and performance. With the extensive application of electronic products, higher requirements have been placed on the specifications and quality of lithium-ion batteries, which has also brought new opportunities for the development of the lithium-ion battery industry and the copper foil industry. At the same time, the performance and quality of copper foil Put forward higher requirements.

　　Technology development trends of copper foil, the key material for 9V rechargeable battery

　　Copper foil is a key material for the negative electrode of 9V rechargeable battery. It has an important impact on battery energy density and other performance. It accounts for about 5%-8% of the cost of 9V rechargeable battery. In the current context of improving quality and reducing costs in the battery industry, ultra-thin and high-end is the key word for its technological development and market demand.

　　With the continuous improvement of energy density, power lithium battery manufacturers have also put forward higher requirements for copper foil. Ultra-thin copper foil (≤6μm), high tensile strength copper foil, porous copper foil, coated copper foil, etc. Available. Like porous aluminum foil, although it can increase the loading capacity of the negative active material and allow the negative electrode to form a three-dimensional conductive network, it still inevitably faces huge difficulties that need to be solved in mass production, such as coating, rolling, There are still certain technical difficulties in cutting and winding, which require the joint efforts of colleagues to solve them.

　　Similar to coated aluminum foil, coated copper foil can also significantly reduce contact internal resistance, improve adhesion, accelerate electrolyte infiltration, improve low-temperature performance, reduce burrs during the process, protect current collectors, etc., but as for At present, the matching with the negative electrode material is not very ideal, so it has not been used in large quantities and requires further research and optimization.

　　In the context of the new energy vehicle industry being strongly supported by national policies, power 9V rechargeable battery will drive China's lithium battery copper foil market to maintain a rapid growth trend. GGII predicts that China's lithium battery copper foil production will reach 148,500 tons by 2020. From the perspective of the Chinese market, with the new energy vehicle industry being strongly supported by national policies, power 9V rechargeable battery will continue to be an important engine for China's lithium battery copper foil market demand to maintain rapid growth in the next few years.

　　From a technical point of view, thinner lithium battery copper foil means smaller resistance, so the energy density and other performance of 9V rechargeable battery will also be improved. Moreover, the smaller the thickness of the lithium battery copper foil, the lighter the weight of the corresponding battery will be, which can effectively reduce the cost of copper foil raw materials. Therefore, the use of thinner lithium battery copper foil is the general trend in the future.

　　Development trend of copper foil for lithium-ion batteries

　　1. Copper foil has higher performance, precision and consistency requirements;

　　2. Thinner to meet the high volume capacity requirements of lithium-ion batteries. The current direction is to develop copper foil with a thickness less than 9m;

　　3. Microscopic treatment of the surface to enhance anti-oxidation, anti-corrosion and electrical conductivity, as well as the adhesion strength to the negative active material;

　　4. In order to meet the needs of polymer lithium-ion batteries and high-capacity alloy anode materials, develop two-dimensional or even three-dimensional copper foil.

　　Summary: Lithium battery copper foil has become the first choice for lithium-ion battery negative electrode current collectors due to its good conductivity, good machining performance, soft texture, mature manufacturing technology, and outstanding cost advantages. With the rapid development of the new energy automobile industry and the accelerated advancement of 5G, the market demand for high-performance copper foil has been increasing in recent years.

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