Effect of porous copper foils on the electrochemical performance of hard carbon anodes
The anode collector is an important part of Li-ion battery,which directly determines the internal resistance of the battery and affects the rate and cycle stability of the battery.Li-ion batteries with conventional copper foil and porous copper foil as the collector are prepared,and the effects of copper foil with holes on the battery capacity,rate capability and cycle performance are investigated by SEM,electrode resistivity,contact angle and galvanostatic charge-discharge tests.Compared with the conventional copper foil,the electrode prepared with porous copper foil as the collector has lower resistivity and better electrolyte wetting effect.After being formatted by cycling 3 times at 0.1 C in 0.001-2.500 V,the initial charge-discharge specific capacity of the prepared half battery is increased by 149.50 mAh/g and 207.03 mAh/g,respectively.The average specific discharge capacity reaches 127.21 mAh/g at a rate of 10.0 C,improving 46.28%compared to the battery prepared with conventional copper foil.After 200 cycles in 0.001-2.500 V at 1.0 C,the capacity retention rate of the battery is 52.85%,the rate and cycle stability of the material are improved.
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