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Today, today's highly developed today, various high-tech emerged in our lives, bring convenience for our lives, then do you understand the lithium-ion batteries that these high-tech may contain? And common predith What is the method of chemical method? 1. We can convert the negative electrode into a single form, then assemble it together with the positive electrode, and then the negative electrode will form a SEI film. This prevents the loss of lithium ions in the positive electrode, and can greatly improve the first efficiency and capacity of the battery: immerse the cathode plate and lithium plate into the electrolyte and charge it through an external circuit connection.
This ensures that the lithium ion consumed during the formation process is from the lithium metal sheet, not the positive pole. After the negative plate is formed, it will be assembled with the positive electrode plate again. The battery should not be re-formed, so the lithium ions of the positive electrode will not be lost due to the formation of the SEI film on the negative electrode, and the capacity will significantly increase.
The advantage of this pre-lithium chemical method is that it can maximize the normalization process and ensure that the formation effect of the SEI film is similar to the formation effect of the complete battery. However, these two processes are difficult to operate: negative electrode preform and positive negative electrode assembly. 2, the negative tap lithium powder method is difficult to form a lithium supplement by only the negative electrode, and therefore people think of the method of spraying the lithium powder onto the negative electrode.
First, to prepare stable metal lithium powder particles. The inner layer of the particles is a metal lithium, and the outer layer is a lithium ion and a protective layer having good conductive electronics. During the preparation of pre-preparation, the lithium powder is first dispersed in an organic solvent, and then the dispersion is sprayed onto the negative electrode plate, and then the organic solvent remaining on the negative electrode plate is then dried to obtain a negative plate.
Subsequent assembly work is consistent with the normal process. During the conversion, the lithium powder sprayed on the negative electrode will be consumed to form a SEI film, thereby maximizing the retention of lithium ions on the positive electrode, and adding the capacity of the entire battery. 3.
Negative three-layer electrode method due to the limitations of equipment and technology, regarding battery factories, simply conducting high-cost predason transformation is not a matter of priority. If you can complete pre-lithiuming in a familiar manner, it will greatly improve the universal. The following three-layer electrode method makes the operation of the battery factory easier.
The core of the three-layer electrode method is the processing of copper foil. Compared with ordinary copper foil, the copper foil of the three-layer electrode method is coated with the desired lithium metal powder. In order to prevent lithium powder from reacting with air, a protective layer is added to the lithium powder.
Negative electrodes directly applied to the protective layer. The overall schematic of the single layer electrode assembly is as follows: When the battery is injected into the battery, the protective layer will dissolve in the electrolyte, so that the metal lithium is in contact with the negative electrode. Lithium ions consumed by the SEI film formation are supplemented by lithium metal powder.
After the electrode is charged, the method is displayed as follows: This method does not strictly requires the processing conditions of the battery factory, but the position of the stable protective layer is extremely difficult to wind, winding and cutting is a big challenge, and the development and development of the research electrode material is also difficult Guarantee. The bond metal lithium powder of the electrode material has become and disappeared. 4.
Positive extreme lithium-rich material method must experience how difficult things in the enlarged laboratory. The cost of equipment transformation, the cost of mass investment in materials, and the cost of controlling the cost of processing, and the new technologies cannot prevent this fatal injury. For the process of the lithium-ion battery, the equipment has been substantially mature.
The ion method can be briefly understood to mean that when the positive lithium ion is converted to a positive lithium ion, the amount of positive lithium ions is average the amount of lithium ion. When the effect of the first negative is less than the positive electrode, the lithium ion is too large, which causes the effective space after discharge, which can not fill the positive electrode lithium ions, resulting in waste of the waste into the positive electrode. If a small amount of a lithium-rich lithium material is added to the positive electrode, it can not only supply more lithium ions to form the conversion of the SEI film, but also prevent the lithium-rich material from being embedded in lithium ion discharge (because all supplies Ion transforming fuel consumption of lithium ions).
The above-mentioned pre-lithiumdiation method is a full battery, wherein the first effect of the negative electrode is lower than the first effect of the positive electrode. After the pre-pre-lithium-based battery, the highest first efficiency can only reach the half-cell level of the positive material material. However, the above method is substantially useless about the primary effect of the positive electrode, since the primary effect of the entire battery is limited by the positive charge, and there is not enough space to insert lithium.
Even if the external lithium is added, it cannot be inserted into the positive electrode, so there is no effect.
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