Effects of Synthesis Methods on the Performance of LiNi_0.4Co_0.2Mn_0.4O₂

摘要

The layered cathode material LiNi0.4Co0.2Mn0.4O2 has been synthesized by sol-gel method ,solid-statemethod and carbonate co-precipitation method, respectively. XRD, SEM, CV, EIS and electrochemicalmeasurements were used to characterize the samples synthesized via different synthetic routes. Theresults show that the difference in preparation methods results in the difference in the structure,morphology of the prepared materials and electrochemical performance. LiNi0.4Co0.2Mn0.4O2 preparedby the sol-gel method exhibited higher discharge capacity than LiNi0.4Co0.2Mn0.4O2 prepared by theother two methods, its initial specific discharge capacity was 191.8 mAh/g (2.3-4.6V, 0.1C rate).However, the sample prepared by carbonate co-precipitation method showed better capacity retentionwhen compared to the sample prepared by the other two methods, it exhibited the capacity retentionsof 93.0% at 0.2C after 50 cycles.