Composite material for negative electrode, method for fabricating the same and electrochemical device using the same

An electrochemical device, comprising:

• a container;
• an alkaline electrolyte, received in the container;
• a positive electrode, interposed in the alkaline electrolyte and comprising a positive electrode substrate and a positive electrode coating layer coated on the positive electrode substrate, wherein the positive electrode coating layer comprises nickel hydroxide;
• and
• a negative electrode, interposed in the alkaline electrolyte and comprising a negative electrode substrate and a negative electrode coating layer coated on the negative electrode substrate, wherein the negative electrode coating layer comprises a plurality of iron oxide particles and a conductivity improver, and the conductivity improver is selected form the group consisting of copper, cobalt, nickel, tin, antimony, bismuth, indium, silver, gold, lead, cadmium, carbon black, graphite, copper salt, cobalt salt, nickel salt, tin salt, antimony salt, bismuth salt, indium salt, silver salt, gold salt, lead salt, cadmium salt, copper hydroxide, cobalt hydroxide, nickel hydroxide, stannic hydroxide, antimony hydroxide, bismuth hydroxide, indium hydroxide, silver hydroxide, gold hydroxide, lead hydroxide, cadmium hydroxide and a combination thereof.