Journal of Power Sources, Vol.189, No.1, 864-868, 2009
The electrochemical properties of copper sulfide as cathode material for rechargeable sodium cell at room temperature
The sodium/copper sulfide (Na/Cu2S) rechargeable batteries are investigated using 1 M NaCF3SO3-TEGDME liquid electrolyte at room temperature. The first discharge curve of Na/Cu2S cells shows a slope shape without plateaus potential region. The first discharge capacity is 294 mAh g(-1) and decreases to 220 mAh g(-1) after 20 cycles. The discharge process can be explained by intercalation ofsodium into Cu2S phase without phase separation of Cu2S. (C) 2008 Elsevier B.V. All rights reserved.