Electrode for electrochemical element and electrochemical element using the electrode

1. An electrode for an electrochemical element reversibly absorbing and releasing lithium ions, comprising:

a current collector having a higher first convex portion and a lower second convex portion on at least one surface thereof;

a columnar body including an active material formed in such a manner as to rise obliquely on the first convex portion and the second convex portion of the current collector,

wherein the first convex portion and the second convex portion are provided in rows and in a direction in which the columnar body rises obliquely, and the first convex portion and the second convex portion are alternatively disposed in a direction orthogonal to the direction in which the columnar body rises obliquely.

2. The electrode for electrochemical element of claim 1 , wherein a content ratio of an element in the columnar body changes sequentially in a width direction in which the columnar body rises obliquely.

3. The electrode for electrochemical element of claim 1 , wherein the columnar body includes n stages (n≧2) of columnar body portions obliquely rising in different directions.

4. The electrode for electrochemical element of claim 3 , wherein a content ratio of an element in the columnar body portion changes sequentially in a width direction in which the columnar body portion rises obliquely, and a direction in which the content ratio changes is different between odd-numbered stages and even-numbered stages.

5. The electrode for electrochemical element of claim 1 , wherein the active material includes at least a material having a theoretical capacity density for reversibly absorbing and releasing lithium ions of more than 833 mAh/cm 3 .

6. The electrode for electrochemical element of claim 5 , wherein the material includes at least a material containing silicon and expressed by SiO x wherein 0≦x≦2.

7. The electrode for electrochemical element of claim 6 , wherein the columnar body includes n stages (n≧2) of columnar body portions obliquely rising in different directions, and a value of x of the material containing silicon and expressed by SiO x continuously increases from an acute angle side to an obtuse angle side with respect to an intersection angle between a center line in an obliquely rising direction of the columnar body and the columnar body portion and a center line in the width direction of the current collector.

8. An electrochemical element comprising:

an electrode for an electrochemical element of claim 1 ;

an electrode for reversibly absorbing and releasing lithium ions; and a non-aqueous electrolyte.

9. An electrode for an electrochemical element reversibly absorbing and releasing lithium ions, comprising:

a current collector having a higher first convex portion and a lower second convex portion on at least one surface thereof;

a columnar body including an active material formed in such a manner as to rise obliquely on the first convex portion and the second convex portion of the current collector,

wherein a content ratio of an element in the columnar body changes sequentially in a width direction in which the columnar body rises obliquely.

10. An electrode for an electrochemical element reversibly absorbing and releasing lithium ions, comprising:

a current collector having a higher first convex portion and a lower second convex portion on at least one surface thereof;

a columnar body including an active material formed in such a manner as to rise obliquely on the first convex portion and the second convex portion of the current collector,

wherein the columnar body includes n stages (n≧2) of columnar body portions obliquely rising in different directions, and

a content ratio of an element in the columnar body portion changes sequentially in a width direction in which the columnar body portion rises obliquely, and a direction in which the content ratio changes is different between odd-numbered stages and even-numbered stages.

11. An electrode for an electrochemical element reversibly absorbing and releasing lithium ions, comprising:

a current collector having a higher first convex portion and a lower second convex portion on at least one surface thereof;

a columnar body including an active material formed in such a manner as to rise obliquely on the first convex portion and the second convex portion of the current collector,

wherein the first convex portion and the second convex portion are provided in different positions in a direction in which the columnar body rises obliquely, and a content ratio of an element in the columnar body changes sequentially in a width direction in which the columnar body rises obliquely.