What is 6s lipo battery ec5 "Lithium Supplement" technology?

[6s lipo battery ec5 lithium supplement reason]

The irreversible capacity loss of the most widely used graphite anodes is >6%, while for silicon-based and tin-based alloy anodes with high specific capacity, the irreversible capacity loss is even as high as 10%-20%. Next, CNHL, the manufacturer of 6s lipo battery ec5, will introduce the 6s lipo battery ec5 lithium replenishment technology in detail. The article will introduce the 6s lipo battery ec5 lithium replenishment technology and classification.

[6s lipo battery ec5 lithium supplement technology method]

In the case of adding some high-capacity silicon-based anode materials, the coulombic efficiency of the 6s lipo battery ec5 in the first week and the capacity of the 6s lipo battery ec5 are low. Supplementing active lithium is an effective means to solve this problem. There are many ways to supplement active lithium that have been reported, mainly two categories: negative electrode lithium supplementation and positive electrode lithium supplementation.
6s lipo battery ec5 negative electrode lithium supplementation includes physical mixed lithiation of metal lithium, such as adding metal lithium powder to the negative electrode or rolling metal lithium foil on the surface of the pole piece; chemical lithiation, using lithiating agents such as butyllithium to chemically lithiate the negative electrode Pre-lithiation;

self-discharge lithiation, the negative electrode of 6s lipo battery ec5 is in contact with metal lithium in the electrolyte to complete self-discharge lithiation; electrochemical pre-lithiation, metal lithium is introduced as the third pole in 6s lipo battery ec5, and the negative electrode is connected to the The third electrode composed of metallic lithium completes the pre-lithiation of the charge and discharge of the electrode.
6s lipo battery ec5 positive electrode lithium supplement is to add lithium-containing compounds with high irreversible capacity to the positive electrode of lithium-ion batteries. Ternary lithium-containing compounds represented by Li6CoO4 and Li5FeO4 and organic lithium-containing compounds represented by Li2DHBN and Li2C2O4. The application of 6s lipo battery ec5 lithium replenishment technology not only improves the capacity of lithium-ion batteries, but also improves the cycle life of silicon-containing anode batteries.

【6s lipo battery ec5 lithium supplement classification】

(1) Lithium foil type lithium supplement

The roll-to-roll negative pole piece pre-lithiation method for batch application, roll-to-roll roll-to-roll metal Sn foil and metal lithium foil, and the metal lithium reacts with the surface layer of the Sn foil under the action of mechanical force to form LixSn. The lithiated Sn foil maintains good stability in the air. The surface of the pre-lithiated tin foil is slightly discolored after 48 h exposure in normal environment, and the pre-lithiated tin foil can still maintain 90% of the initial capacity when exposed to 79% humidity air for 12 h. The coulombic efficiency of the LFP|Sn battery assembled with pre-lithiated Sn foil reaches 94% in the first week and can be cycled stably for 200 weeks. This 6s lipo battery ec5 lithium replenishment method is also suitable for Al foil and conventional silicon carbon negative pole pieces.

(2) Lithium powder to supplement lithium

The drop emulsion technology is a very effective method for synthesizing stable lithium powder. Using the drop emulsion technology, a stable layer is coated on the surface of the lithium powder. The composition of the stable layer is lithium carbonate and lithium fluoride. Lithium powder can not only improve the cycle life of the 6s lipo battery ec5 lithium anode, but also effectively inhibit the formation of lithium dendrites. Stabilized lithium metal powder SLMP (stabilized lithium metal powder) is a commercial product produced by FMC Corporation. It has a core-shell structure and consists of 97% lithium and 3% lithium carbonate coating.

The lithium carbonate protective layer is evenly coated on the surface of the lithium powder, which can prevent the adverse side reactions of the lithium powder, so that the SLMP can be used in a dry environment without having to be in an inert atmosphere. SLMP has a specific capacity of up to 3600 mA h/g. Using it for lithium supplementation in the negative electrode of 6s lipo battery ec5 can not only improve the capacity of 6s lipo battery ec5, but also improve its first-week storage efficiency and cycle life.

(3) Electrochemical lithium supplementation

In the existing lithium-ion electrochemical system, by introducing metal lithium and 6s lipo battery ec5 negative electrode to form a counter electrode, and controlling the depth of electrochemical charge and discharge, the pre-lithiation of the negative electrode of 6s lipo battery ec5 can be completed. Electrochemical pre-lithiation can be divided into ex-situ and in-situ electrochemical pre-lithiation according to the implementation method. For example, in the conventional ex-situ electrochemical pre-lithiation process, the negative electrode plate that needs to be pre-lithiated and the metal lithium are assembled into a half-cell.

After a specific charge and discharge cycle, the negative electrode plate of the 6s lipo battery ec5 reaches the set pre-lithiation level. Then assemble the pre-lithiated negative electrode sheet with the new positive electrode sheet to form a 6s lipo battery ec5.
In order to simplify the process of disassembling and reassembling the battery in the ex-situ electrochemical lithiation method, the in-situ electrochemical lithiation method has been gradually developed. The in-situ electrochemical lithiation method needs to redesign the 6s lipo battery ec5.

In the assembly process, metal lithium is pre-added as the third electrode, and the negative electrode of the 6s lipo battery ec5 and the metal electrode are used as the counter electrode to discharge. Lithium supplementation in situ. First, the hard carbon negative electrode and the metal lithium electrode are used as the counter electrode to discharge the hard carbon negative electrode to supplement lithium, and then the NCM positive electrode and the lithium supplemented hard carbon negative electrode form an electrochemical system for charge and discharge work.

(4) Lithium supplement of positive electrode

The 6s lipo battery ec5 cathode lithium supplement material can be directly added in the homogenization process of the cathode slurry without additional process improvement and the cost is low, so it is more suitable for the current 6s lipo battery ec5 manufacturing process, and is known as the most promising. Lithium supplement technology. From the application point of view, the perfect 6s lipo battery ec5 positive electrode lithium supplement material needs to meet the following 4 basic requirements:

①6s lipo battery ec5 The irreversible delithiation process of the positive electrode lithium supplement material should be within the working voltage range of the positive electrode, that is, its delithiation potential is lower than the upper voltage limit of the positive electrode material, and the lithium intercalation potential is lower than the lower voltage limit of the positive electrode material;
② The lithium-replenishing material should exhibit sufficiently high specific energy and volumetric energy density, usually with an irreversible capacity greater than 350 mA h/g for efficient prelithiation
③ The positive electrode lithium supplement material should be compatible with the current general production process and battery system, and it will not react with NMP, binder, etc. during the production of the pole piece, and there will be no adverse side reactions with the electrolyte during the cycle of 6s lipo battery ec5. The first week After the cycle, its decomposition products do not affect the cycle of 6s lipo battery ec5;

④ The positive electrode lithium supplement material has good environmental stability and can be kept stable in air or dry environment.
The above is the whole content of the 6s lipo battery ec5 lithium replenishment technology brought to you by CNHL today. I hope this article can help you understand why the 6s lipo battery ec5 needs to be replenished with lithium and the 6s lipo battery ec5 lithium replenishment method and classification.
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