aaa alkaline battery

　　aaa alkaline battery manufacturers briefly talk about what is aaa alkaline battery prelithiation? aaa alkaline battery prelithiation technology

　　aaa alkaline battery manufacturers briefly talk about what is prelithiation of lithium batteries? aaa alkaline battery pre-lithium technology. In recent years, electric vehicles powered by lithium batteries have been developing rapidly. However, the performance of lithium batteries decreases rapidly as the temperature decreases; prelithiation shows excellent electrochemical properties and has been applied to hybrid lithium-ion capacitors. The following is a brief discussion from aaa alkaline battery manufacturers about what is pre-lithiation of lithium batteries? aaa alkaline battery pre-lithium technology.

　　1. aaa alkaline battery manufacturers briefly discuss what prelithiation of lithium batteries is?

　　For a full battery, the SEI film formed at the negative electrode interface during formation will consume the lithium ions deintercalated from the positive electrode and reduce the battery capacity; if we can find another lithium source outside the positive electrode material, the SEI film can be formed By consuming lithium ions from external lithium sources, this ensures that the lithium ions deintercalated from the positive electrode will not be wasted in the formation process, and ultimately the capacity of the aaa alkaline battery can be increased. This process of providing an external lithium source is prelithiation.

　　Main methods of prelithiation

　　1. Negative electrode formation method in advance

　　Let the negative electrode be formed separately, and then assemble it with the positive electrode after the SEI film is formed on the negative electrode to avoid the loss of lithium ions in the positive electrode and greatly improve the first efficiency and capacity of the full battery. The advantage of this pre-lithiation method is that it can simulate the normal formation process to the maximum extent while ensuring that the formation effect of the SEI film is similar to that of lithium batteries. However, the two processes of early formation of negative electrode sheets and assembly of positive and negative electrode sheets are too difficult to operate. .

　　2. Negative electrode spraying lithium powder method

　　A stable metallic lithium powder particle is produced. The inner layer of the particle is metallic lithium, and the outer layer is a protective layer with good lithium ion conductivity and electronic conductivity. During the prelithiation process, the lithium powder is first dispersed in In an organic solvent, the dispersion is then sprayed on the negative electrode sheet, and then the residual organic solvent on the negative electrode sheet is dried, thus obtaining a pre-lithiated negative electrode sheet.

　　During formation, the lithium powder sprayed on the negative electrode will be consumed in the formation of the SEI film, thereby maximizing the retention of lithium ions deintercalated from the positive electrode and increasing the capacity of the aaa alkaline battery. The disadvantage of using this pre-lithiation method is that it is less safe. It is difficult to guarantee, and the cost of material and equipment modification is high.

　　3. Negative three-layer electrode method

　　Compared with normal copper foil, the copper foil of the three-layer electrode method is coated with metallic lithium powder required for later formation. In order to protect the lithium powder from reacting with the air, a protective layer is coated; the negative electrode is directly coated on on the protective layer.

　　When the battery core is filled with liquid, the protective layer will dissolve in the electrolyte, allowing the metal lithium to contact the negative electrode. The lithium ions consumed to form the SEI film during formation are replenished by the metal lithium powder. This method has a certain impact on the processing conditions of the aaa alkaline battery factory. There are no strict requirements, but the stability of the protective layer at the pole piece rewinding, rolling, cutting and other stations is a great challenge to the research and development of electrode materials. The bonding of the negative electrode material after the metallic lithium powder disappears is also quite guaranteed. difficult.

　　4. Cathode lithium-rich material method

　　When the first efficiency of the negative electrode is lower than that of the positive electrode, too many lithium ions will be lost to the negative electrode during formation, resulting in the effective space of the positive electrode not being filled with lithium ions after discharge, resulting in a waste of lithium-embedded space in the positive electrode; if a small amount is added to the positive electrode The high-gram capacity lithium-rich material can not only provide more lithium ions for the formation of the SEI film during formation, but also eliminate the need to worry about the lithium-rich material being unable to insert lithium again during discharge.

　　2. aaa alkaline battery pre-lithiumization technology

　　A common pre-lithiation method is to replenish lithium to the negative electrode, such as lithium foil to replenish lithium, lithium powder to replenish lithium, etc., which are currently the focus of development of pre-lithiation processes; in addition, lithium silicide powder and electrolytic lithium brine solution are also used for pre-lithiation. Lithium technology.

　　1. Lithium foil supplementation

　　Lithium foil lithium replenishment is a technology that uses self-discharge mechanism to replenish lithium. The potential of metallic lithium is the lowest among all electrode materials. Due to the existence of potential difference, when the negative electrode material comes into contact with the metallic lithium foil, electrons spontaneously move toward the negative electrode, accompanied by the embedding of Li+ in the negative electrode.

　　2. Stabilized lithium metal powder (SLMP)

　　Compared with adding during the slurry mixing process, it is simpler and easier to load SLMP directly onto the dry anode surface. Use SLMP to pre-lithiate the silicon-carbon nanotube negative electrode. Drop a 3% SLMP/toluene solution on the surface of the silicon-carbon nanotube negative electrode. After the toluene solvent evaporates, press, activate and pre-lithiate. Afterwards, the first irreversible capacity of the negative electrode was reduced by 20% to 40%.

　　3. Lithium silicide powder

　　The size of nano-lithium silicide powder is very small, which is more conducive to dispersion in the negative electrode; in addition, it is already in an expanded state, and the volume change during cycling will not affect the structure of the entire electrode.

　　4. Electrolytic lithium salt water solution for lithium replenishment

　　Silicon is replenished with lithium by electrolyzing Li2SO4 aqueous solution in an electrolytic cell. The sacrificial electrode is a copper wire immersed in Li2SO4. Whether lithium foil, SLMP or lithium silicide powder is used to replenish lithium, it involves the use of metallic lithium. Lithium metal is expensive, highly reactive, difficult to operate, and requires high costs for storage and transportation for protection.

　　With the deepening of research on aaa alkaline battery materials, the improvement of manufacturing levels, and the increasing market requirements for battery performance, the traditional ideas of replacing electrode materials and developing new electrolytes to improve the performance of lithium batteries have been very limited. The emergence of pre-lithium technology has provided an effective solution to improve the performance of lithium batteries, especially in improving irreversible capacity loss and increasing energy density, and has injected new vitality into the development of aaa alkaline battery technology.

　　Based on the latest research progress of the above-mentioned pre-lithiation technology in the application of lithium-ion batteries, this paper reviews the selection of pre-lithiation materials, pre-lithiation process methods, and the mechanism of the impact of pre-lithiation on aaa alkaline battery performance, and looks forward to the pre-lithiation technology. The future development trend of lithium technology.

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