Cathode material and a method of preparing the same

An electrochemical cell comprising a liquid electrolyte, and a cathode material comprising a layer of sulfur species dispersed within or thereon a porous matrix comprising a first conducting carbon material, a second conducting carbon material and a binder, wherein the binder is a copolymer of acrylamide, lithium carboxylate and cyano group,

• the second conducting carbon material is carbon fiber or carbon nanotube, and
• said porous matrix is interconnected with uniform pores.

A lithium-sulfur battery comprising one or more electrochemical cells, each electrochemical cell comprising a liquid electrolyte, and a cathode material comprising

• a layer of sulfur species dispersed within or thereon a porous matrix comprising a first conducting carbon material, a second conducting carbon material and a binder, wherein the binder is a copolymer of acrylamide, lithium carboxylate and cyano group,
• the second conducting carbon material is carbon fiber or carbon nanotube, and
• said porous matrix is interconnected with uniform pores.

A method for preparing a cathode material comprising:

• a) coating a support with a slurry formed by mixing a mixture of a first conducting carbon material, a second conducting carbon material and a binder, wherein the binder is a copolymer of acrylamide, lithium carboxylate and cyano group, and the second conducting carbon material is carbon fiber or carbon nanotube;
• and
• b) adding a sulfur source in solution or gaseous state to the coated support to form a layer of sulfur species dispersed within or thereon the coated support to thereby obtain the cathode material, wherein the coated support is a porous matrix comprising the first conducting carbon material, the second conducting carbon material and the binder, and said porous matrix is interconnected with uniform pores.