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Environmentally compatible dimethyl sulfoxide: an alternative to N-methyl pyrrolidone for electrochemical performance of recycled LiMn 1/3 Ni 1/3 Co 1/3 O 2...The effect of recycling and doping LiMn 1/3 Ni 1/3 Co 1/3 O 2 of lithium-ion battery with dimethyl sulfoxide ( DMSO ) instead of N-methyl pyrrolidone (NMP) on the electrochemical performance of the battery has been investigated for the first time. Observation shows that preparing the cathode active materials with dimethyl sulfoxide will increase the conductivity of the battery. The results show that the as-recovered LiMn 1/3 Ni 1/3 Co 1/3 O 2 modified with LiOH ? H 2 O calcined at 450°C delivers discharge capacities of about 247 mA h g 611 in the first cycle with discharge efficiency of 83.1% in sample doped with dimethyl sulfoxide, and 189 mA h g 611 with discharge efficiency of 82.7% in N-methyl pyrrolidone at the rate of 0.2 C. The asrecovered samples calcined at 800 and 850°C deliver 149 and 217 mA h g 611 in the fourth cycles respectively in dimethyl sulfoxide. The capacity loss observed in dimethyl sulfoxide faded with increase in cycle numbers. In general, for the samples doped with dimethyl sulfoxide, better performances were evident with high discharge capacities in powders calcined at a lower temperature than higher temperature in accordance with particle sizes shown by the SEM images. On the basis of better cyclic performance of lithium metal cathode and environmental safety, it is evident that relatively cheap dimethyl sulfoxide could replace N-methyl pyrrolidone in battery formulations. The X-ray diffraction patterns revealed that LiMn 1/3 Ni 1/3 Co 1/3 O 2 was successfully recycled by dimethyl sulfoxide.

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