The Effects of Different Nitrile Additive Applied in Lithium/Manganese-rich/Graphite Battery
Adiponitrile(ADN)and 1,3,6-Hexanetrinitrile(HTCN)as electrolyte additives had been found to improve the electrochemical performance of high-voltage lithium-rich/manganese/graphite battery.From the comparison of cycle performance with the batteries containing 1%ADN and 1%HTCN,it is found that HTCN is better.When charged-discharged in 2.0 V～4.65 V at 0.5 C,the battery with HTCN exhibited capacity retention of 94.5%at 25℃after 470 cycles,and 93.6%at 45℃after 220 cycles.Scanning electron microscopy show that the decomposition of the electrolyte was inhibited by the addition of ADN and HTCN,both of them have equivalent effect.The calculation results of LSV and DFT show that adding ADN and HTCN can improve stability of electrolyte at high voltage,and HTCN is better than ADN in overall.Inductively Coupled Plasma-Atomic Emission Spectroscopy(ICP-AES)shows that both ADN and HTCN can inhibit the dissolution of Mn,and the effect of adding HTCN is better,and the amount of Mn deposited on the anode is about 83.3%of that of the battery added with ADN.
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