Deactivating method of outermost shell negative electrode, manufacturing method of electrode assembly, and electrode assembly

A method of manufacturing an electrode assembly, the method comprising:

• a deactivation step of forming a deactivation region having a predetermined width (w) along an edge of one side of a first negative electrode;
• a step of sequentially laminating a first separator, the first negative electrode on which the deactivation region is formed, a second separator, and a first positive electrode, to manufacture a first mono cell;
• a step of sequentially laminating a third separator, a second negative electrode on which the deactivation region is not formed, a fourth separator, and a second positive electrode to manufacture a plurality of second mono cells;
• a step of sequentially laminating a fifth separator, a second negative electrode on which the deactivation region is formed, and a sixth separator to manufacture a half-cell;
• a step of sequentially laminating the plurality of second mono cells on the first mono cell to manufacture a laminate;
• and
• a step of laminating the half-cell on the second mono cell disposed at the uppermost end of the laminate to manufacture an electrode assembly, wherein
• in the deactivation step, the width (w) is determined based on a horizontal length of the first negative electrode, a vertical length of the first negative electrode, and the number of first and second mono cells in the electrode assembly.

An electrode assembly comprising:

• a first mono cell obtained by sequentially laminating a first separator, a first negative electrode on which a deactivation region having a predetermined width (w) is formed along an edge of one side, a second separator, and a first positive electrode;
• a plurality of second mono cells laminated on the first mono cell and obtained by sequentially laminating a third separator, a second negative electrode, a fourth separator, and a second positive electrode;
• and
• a half-cell laminated on the second mono cell disposed at the uppermost end and obtained by sequentially laminating a fifth separator, a second negative electrode on which a deactivation region is formed, and a sixth separator, wherein
• the deactivation region has a width (w) of 0.9P2 to 1.2P2, where
• the P2 is calculated by Equation 4 below:
• P
• 2
• =
• 0.1
• a
• ⁢
• 2
• ⁢
• b
• ⁢
• 2
• (
• a
• ⁢
• 2
• +
• b
• ⁢
• 2
• )
• ×
• log
• ⁢
• c
• ⁢
• 2
• Equation
• ⁢
• 4
• wherein, a2 is a horizontal length of the first negative electrode, b2 is a vertical length of the first negative electrode, and c2 is the number of the first and second mono cells.

An electrode assembly comprising:

• a first mono cell obtained by sequentially laminating a first separator, a first negative electrode on which a deactivation region having a predetermined width (w) is formed along an edge of one side, a second separator, and a first positive electrode;
• a plurality of second mono cells laminated on the first mono cell and obtained by sequentially laminating a third separator, a second negative electrode, a fourth separator, and a second positive electrode;
• and
• a half-cell laminated on the second mono cell disposed at the uppermost end and obtained by sequentially laminating a fifth separator, a second negative electrode on which a deactivation region is formed, and a sixth separator, wherein
• when a ratio (A/B), wherein (A) is a sum of areas of one side of the plurality of negative electrodes in the electrode assembly and (B) is a sum of areas of one side of the plurality of positive electrodes in the electrode assembly, is 1.1 or more to less than 1.2, the deactivation region has a width (w) of 1.0X3 to 1.25X3, and
• when the ratio (A/B) is 1.2 or more, the deactivation region has a width (w) in a range of 1.0X4 to 1.5X4, where
• the X3 and X4 are calculated by Equations 5 and 6 below, respectively:
• (
• Y
• 2
• -
• X
• 3
• )
• ·
• (
• Z
• 2
• ·
• X
• 3
• )
• =
• Y
• 2
• ·
• Z
• 2
• ·
• 0.85
• Equation
• ⁢
• 5
• (
• Y
• 2
• -
• X
• 4
• )
• ·
• (
• Z
• 2
• ·
• X
• 4
• )
• =
• Y
• 2
• ·
• Z
• 2
• ·
• 0.8
• Equation
• ⁢
• 6
• wherein, Y2 is the horizontal length of the first negative electrode, and Z2 is the vertical length of the first negative electrode.