Negative electrode for nonaqueous secondary battery

Details Negative electrode for nonaqueous secondary battery Negative electrode for nonaqueous secondary battery

H - Electricity

01

M

H01M 4/02 (2006.01) H01M 4/04 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2628975

Disclosed is a negative electrode (10) for nonaqueous electrolyte secondary batteries, which comprises an active material layer (12) containing particles (12a) of the active material. A metal material (13) having low lithium compound-forming ability is deposited between particles (12a) by electrolytic plating. The surface of the active material layer (12) is continuously or discontinuously covered with a surface layer (14) which is composed of a metal material similar to or different from the metal material (13) and has an average thickness of not more than 0.25 µm. It is preferable that the surfaces of the particles (12a) are covered with the metal material (13) and air gaps are formed between the particles (12a), which are covered with the metal material (13), within the active material layer (12). The average thickness of the metal material (13) covering the surfaces of particles (12a) is preferably 0.05-2 µm.

La présente invention concerne une électrode secondaire (10) pour des batteries secondaires électrolytiques non aqueuses, qui comprend une couche de matière active (12) contenant des particules (12a) de la matière active. Un matériau métallique (13) ayant une faible aptitude à la formation d'un composé de lithium est déposé entre les particules (12a) par placage électrolytique. La surface de la couche de matière active (12) est recouverte de manière continue ou discontinue d'une couche de surface (14) qui est composée d'un matériau métallique identique ou différent du matériau métallique (13) et présente une épaisseur moyenne n'étant pas supérieure à 0,25 µm. On préfère que les surfaces des particules (12a) soient recouvertes du matériau métallique (13) et que des espaces d'air soient formés entre les particules (12a), qui sont recouvertes du matériau métallique (13), dans la couche de matière active (12). L'épaisseur moyenne du matériau métallique (13) recouvrant les surfaces des particules (12a) est de préférence de 0,05 à 2 µm.

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