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

專利號(hào)
US11177501B2
公開日期
2021-11-16
申請(qǐng)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(shuō)明書

Since the negative electrode active material containing the silicon compound produced according to the production method of the present invention like this is a silicon-based active material mainly made of the silicon compound, the battery capacity may be made large. Further, by making the Li contain in the silicon compound, the irreversible capacity may be reduced at the time of initial charge/discharge of the battery containing the silicon-based active material. Further, when the production method of the negative electrode active material of the present invention contains the step 3 and the step 4 of FIG. 1, which are inactivation steps of Li contained in the silicon compound, the Li contained in the silicon compound is sufficiently deactivated, thus, the negative electrode active material becomes difficult to cause the violent reaction with an aqueous slurry.

Further, when steps of inserting the lithium and making contact with the solution B and the solution C (step 2 to step 4) are carried out after forming the silicon compound into the electrode, since the active Li portion contained in the silicon compound is deactivated in advance and an excess lithium compound is difficult to be generated on a surface of the active material, the battery characteristics may be suppressed from deteriorating.

Subsequently, the production method of the negative electrode active material of the present invention will be specifically described.

(1. Production Method of Negative Electrode Active Material)

權(quán)利要求

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