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Production method for non-aqueous electrolyte secondary battery active material providing lithium insertion and solution contact

專利號
US11177501B2
公開日期
2021-11-16
申請人
SHIN-ETSU CHEMICAL CO., LTD.（JP Tokyo）
發(fā)明人
Hiromichi Kamo; Takakazu Hirose
IPC分類
H01M10/0525; H01M4/13; H01M4/48; H01M4/139; H01M4/1391; H01M4/1395; H01M4/38; H01M4/485; H01M10/0569; H01M4/02; H01M10/0587
技術(shù)領(lǐng)域
electrode,compound,silicon,lithium,solution,negative,solvent,battery,active,in
地域： Tokyo

摘要

A production method of a negative electrode active material for non-aqueous electrolyte secondary batteries containing a silicon compound (SiOx: 0.5≤x≤1.6) that contains Li, includes: making a silicon compound into which the lithium has been inserted contact with a solution B containing a polycyclic aromatic compound or a derivative thereof or both thereof (here, the solution B contains one or more kinds selected from an ether-based solvent, a ketone-based solvent, an ester-based solvent, an alcohol-based solvent, and an amine-based solvent as the solvent); and making the silicon compound contact with a solution C (here, the solution C contains one or more kinds selected from an alcohol-based solvent, a carboxylic acid-based solvent, and water as the solvent). Thereby, a production method of a negative electrode active material for non-aqueous electrolyte secondary batteries is capable of increasing a battery capacity and improving the cycle characteristics.

說明書

Further, among the alcohol-based solvents, carboxylic acid-based solvents, and water, by combining two or more kinds thereof, mixed solvents may be used.

Among these, in particular, as the solution C, ones containing the alcohol-based solvent or water as the solvent are preferably used. In the alcohol-based solvents, the deactivation of the active Li in the silicon compound is preferable to proceed mildly and sufficiently. Further, since water has a large heat capacity, the deactivation of the active Li in the silicon compound preferably occurs without accompanying a large temperature increase.

As was described above, the negative electrode active material may be produced according to the production method of the negative electrode active material of the present invention. Subsequently, the production method of a negative electrode will be described.

2. Production Method of Negative Electrode

(Configuration of Negative Electrode)

First, a configuration of the negative electrode will be described with reference to FIG. 2. As shown in FIG. 2, a negative electrode 10 may have a configuration having a negative electrode active material layer 12 on a negative electrode current collector 11. The negative electrode active material layer 12 may be provided on both sides or only one side of the negative electrode current collector 11.

(Negative Electrode Current Collector)

權(quán)利要求

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