Condactive Carbon Layers for Composite Electrode in Lithium Batteries

Condactive Carbon Layers for Composite Electrode in Lithium Batteries


Lithium-ion (Li-Ion) batteries are devices for collecting and transmitting

electricity with the highest energy storage capacity per weight and

volume. Commonly they are used in cell phones, digital cameras and

notebooks, but also in the measuring apparatus, electro-tools, telemetry

systems, satellite communications, or in a hybrid-powered (HEV) and

electric cars (EV).

Battery negative electrode is made of porous carbon or graphite while

positive electrode of transition metal oxides (cobalt, manganese or nickel).

Conductive carbon layer designed to the electrode layers are usually

obtained by pyrolysis of organic compounds or polymers. For this

purpose physical mixtures are prepared or organic solvents are used.

Previous carbon layers obtained by pyrolysis of organic materials do

not show appropriate surface morphology and sufficient high electrical 

conductivity. Conductive carbon layers used for lithium batteries should

have a low surface of contact with electrolyte in order to reduce the

SEI layer (Solid-Electrolite Interphase), while strictly adhere to the

surface of electrochemically active material. Moreover, they should have

a sufficient electrical conductivity, as well should not impede the

transport of lithium ions between the electrolyte and active material

during charge and discharge processes.

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