Composite particles for an electrode, production process thereof and electrochemical device

1. Composite particles for an electrode comprising LiVOPO 4 particles and carbon, wherein the carbon (i) comprises ketjen black and (ii) is supported on at least a portion of the surface of the LiVOPO 4 particles to form a carbon coating layer,

wherein, when the length of the outer circumference of the LiVOPO 4 particles in a cross-section of the composite particles for an electrode is designated as L, and the length of the portion of the outer circumference of the LiVOPO 4 particles where the carbon coating layer is formed is designated as L′, then the coating ratio as represented by (L′/L) is from about 0.2 or more to about 0.85 or below.

2. The composite particles for an electrode according to claim 1 , wherein the BET specific surface area is 1.5 to 15.0 m 2 /g.

3. The composite particles for an electrode according to claim 1 , wherein the thickness of the carbon coating layer is 10 to 500 nm.

4. The composite particles for an electrode according to claim 1 , wherein the carbon content based on the total mass of the composite particles for an electrode is 1 to 6% by mass.

5. An electrochemical device comprising an electrode containing the composite particles for an electrode according to claim 1 .

6. The electrochemical device according to claim 5 , wherein the electrode has an active material-containing layer containing the composite particles for an electrode, and the carbon content based on the total mass of the active material-containing layer is 2 to 10% by mass.

7. The composite particles for an electrode according to claim 1 , wherein the carbon consists essentially of ketjen black.