18650 lithium ion battery cell

　　18650 lithium ion battery cell manufacturers interpret lithium-ion battery anode material process cost analysis

　　18650 lithium ion battery cell manufacturers interpret lithium-ion battery anode material process cost analysis. Anode material is a key material that plays a decisive role in the performance of lithium batteries. The specific capacity and working voltage of the negative electrode directly determine the energy density of lithium batteries and is one of the most important battery materials. Due to differences in raw material taste and yield, as well as differences in graphitization processes, it is more difficult for battery cell manufacturers to lower prices. By interpreting the process cost analysis of lithium-ion battery anode materials, process innovation optimization and industry chain integration, there is room for further cost reduction.

　　Lithium-ion battery anode material process cost analysis

　　Lithium-ion batteries are composed of four main materials: positive electrode material, negative electrode material, electrolyte, and separator. The negative electrode material serves as a carrier for lithium ion deintercalation. Of course, there are many substances that can be used as negative electrode materials for lithium-ion batteries, including carbon materials, carbon-containing compounds and non-carbon materials. Graphite among carbon materials is the most widely used anode material with the most stable performance and good electrolyte compatibility.

　　1. Positive electrode (cathode) material: The main components of lithium-ion batteries include electrolyte, isolation materials, positive and negative electrode materials, etc. The positive electrode material occupies a large proportion (the mass ratio of positive and negative electrode materials is 3:1~4:1). Therefore, the performance of the positive electrode material directly affects the performance of the lithium-ion battery, and its cost also directly determines the cost of the battery.

　　2. Negative electrode (anode) materials: At present, there are many researches on negative electrode materials for lithium-ion batteries: carbon materials, silicon-based materials, tin-based materials, lithium titanate, transition metal oxides, etc. However, carbon materials are mainly used in industrialization. Among them, graphite carbon materials have relatively mature technology, outstanding performance in terms of safety and cycle life, are cheap and non-toxic, and are relatively common anode materials. Artificial graphite improves the electrical properties of graphite by surface modification of natural graphite through oxidation. It is currently the most commonly used and used negative electrode material.

　　At present, the price of domestic products is between RMB 60,000/ton and RMB 100,000/ton; the price of Japanese products is between RMB 100,000/ton and RMB 150,000/ton, and those sold to China range from RMB 120,000/ton to RMB 200,000/ton.

　　3. Electrolyte: In terms of performance and stability of lithium-ion batteries, electrolyte has always been at the center. Lithium salt is the focus of electrolyte manufacturing, and lithium salt is currently almost monopolized by several Japanese companies. At present, some domestic companies also claim to produce electrolytes or lithium salts used in lithium power batteries, but whether they can be used in power batteries in batches remains to be discussed. However, there are currently many listed companies in China that are implementing the industrialization of electrolytes for lithium-ion power batteries.

　　The current price of domestically purchased Japanese products is between 350,000-400,000/ton, but the actual cost is 100,000/ton.

　　4. Separator: The lithium-ion power battery separator is a polymer functional material with nano-scale micropores. It is an important part of the battery core. It separates the positive and negative electrodes and has electronic insulation and ion conductivity. ;Also has a "thermal shutdown" feature. The performance of the separator determines the interface structure of the battery, the retention of the electrolyte and the internal resistance of the battery, etc., which in turn affects key indicators such as the battery's capacity, cycle performance, charge and discharge current density, and safety. However, the key technology for separator preparation has been Japanese mastery. Although some domestic manufacturers, including some listed companies, are focusing on R&D and industrialization, they are still some way off from large-scale industrialization of lithium power batteries.

　　The current price of domestically purchased Japanese products ranges from 20 to 55 yuan/m2. However, currently, the diaphragms imported from Japan are not the mainstream products in Japan.

　　Lithium-ion battery requirements for negative electrode materials

　　As the core component of lithium-ion batteries, negative electrode materials usually need to meet the following conditions when applied:

　　①The lithium embedded potential is low and stable to ensure a higher output voltage;

　　② Allows more lithium ions to be reversibly deintercalated and has a higher specific capacity;

　　③The structure is relatively stable during the charge and discharge process and has a long cycle life;

　　④High electronic conductivity, ionic conductivity and low charge transfer resistance to ensure smaller voltage polarization and good rate performance;

　　⑤ Able to form a stable solid electrolyte membrane with the electrolyte to ensure high Coulombic efficiency;

　　⑥Environmentally friendly, it will not cause serious pollution to the environment during the production and actual use of the material.

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