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Problems solved by technology
However, there are problems in that the capacity of the battery is reduced due to the high irreversible capacity, and the life characteristics of the battery are deteriorated
However, since high temperature is required for lithium doping, it may be difficult to control lithium doping, and there may be problems in processability and cost.
Method used
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manufacture example 1
[0061] Production example 1: Production of a preliminary negative electrode
[0062] A negative electrode active material (standard reduction potential: about -2.0 V vs. NHE) in which artificial graphite and SiO were mixed in a weight ratio of 7:3, Denka Black as a conductive material, styrene-butadiene rubber (Styrenebutadiene rubber, SBR) and carboxymethylcellulose (Carboxymethylcellulose, CMC) were added to water at a weight ratio of 92:3:3.5:1.5 to prepare negative electrode slurry. The negative electrode slurry was applied to a copper (Cu) metal film with a thickness of about 20 μm as the negative electrode current collector so that the loading amount reached 5 mg / cm 2 , and dried in a vacuum oven at 130° C. for 12 hours, and then rolled to produce a preliminary negative electrode.
Embodiment 1
[0063] Embodiment 1: the manufacture of negative electrode
[0064] (1) Preparation of pre-lithiation solution
[0065] Hexane in which n-butyllithium (standard reduction potential: about −2.7 V vs. NHE) was dissolved at a concentration of 0.1 M was prepared as a prelithiation solution.
[0066] (2) Manufacture of negative electrode (pre-lithiation)
[0067] The preliminary negative electrode of Production Example 1 was moved into the pre-lithiation solution, and then immersed in the pre-lithiation solution for 24 hours. Afterwards, the prepared anode was removed from the pre-lithiation solution, washed with hexane, and then vacuum-dried at 50 °C for 1 h. As a result, a negative electrode was produced.
Embodiment 2
[0068] Example 2: Manufacture of Negative Electrode
[0069] (1) Preparation of pre-lithiation solution
[0070] Hexane in which n-butyllithium (standard reduction potential: about −2.7 V vs. NHE) was dissolved at a concentration of 0.05 M was prepared as a prelithiation solution.
[0071] (2) Manufacture of negative electrode
[0072] A negative electrode was fabricated in the same manner as in Example 1, except that the above-mentioned pre-lithiation solution was used instead of the pre-lithiation solution used in Example 1.
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Abstract
The present invention relates to a method for manufacturing a negative electrode, the method comprising the steps of: immersing a preliminary negative electrode in a pre-lithiation solution containingan organic lithium compound and a pre-lithiation solvent; and taking the preliminary negative electrode out of the pre-lithiation solution, and then removing the pre-lithiation solvent present on thepreliminary negative electrode, wherein the preliminary negative electrode comprises a current collector and a preliminary negative electrode active material layer disposed on the current collector,the preliminary negative electrode active material layer containing a negative electrode active material, and the standard reduction potential of the organic lithium compound is lower than the standard reduction potential of the negative electrode active material.
Description
technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2018-0026991 filed with the Korean Intellectual Property Office on March 7, 2018, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a method for manufacturing a negative electrode, the method comprising: immersing a preliminary negative electrode in a pre-lithiation solution comprising a lithium organic compound and a pre-lithiation solvent, and removing the preliminary negative electrode from the pre-lithiation solution Take out, and then remove the pre-lithiation solvent present in the preliminary negative electrode, wherein the preliminary negative electrode includes a current collector and a preliminary negative active material layer disposed on the current collector, and the preliminary negative active material layer includes a negative acti...
Claims
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