At present,metal ions from spent lithium-ion batteries are mostly recovered by the acid leaching procedure,which unavoidably introduces potential pollutants to the environment.Therefore,it is necessary to develop more...At present,metal ions from spent lithium-ion batteries are mostly recovered by the acid leaching procedure,which unavoidably introduces potential pollutants to the environment.Therefore,it is necessary to develop more direct and effective green recycling methods.In this research,a method for the direct regeneration of anode materials is reported,which includes the particles size reduction of recovered raw materials by jet milling and ball milling,followed by calcination at high temperature after lithium supplementation.The regenerated LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) single-crystal cathode material possessed a relatively ideal layered structure and a complete surface morphology when the lithium content was n(Ni+Co+Mn):n(Li)=1:1.10 at a sintering temperature of 920 0 C,and a sintering time of 12 h.The first discharge specific capacity was 154.87 mA·h·g^(-1) between 2.75 V and 4.2 V,with a capacity retention rate of 90% after 100 cycles.展开更多
In recent years,researches on improving high-voltage performance of lithium-ion batteries incorporating LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)(NCM523)and artificial graphite(AG)have been widely reported.However,limited atten...In recent years,researches on improving high-voltage performance of lithium-ion batteries incorporating LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)(NCM523)and artificial graphite(AG)have been widely reported.However,limited attentions have been paid to understand the effects and influence mechanisms of charge and discharge rates and charge limit currents on cyclability of NCM523/AG cells.Herein,a∼1.9 Ah NCM523/AG pouch cell is employed,whose electrochemical and structural evolutions after 800 cycles at various rates are comprehensively investigated.We find that cycling performances are strongly influenced by charge rate,followed by limit current and discharge rate.The cell charged at a high rate and cell charged until reaching a low limit current both exhibit low capacity retentions compared to the cell discharged at a high rate.Possible failure reasons are analyzed by advanced characterizations.Results reveal that NCM523 cathodes of the cells deteriorated early experience severe transition metal dissolution,lattice distortion,and partial phase transformation.Meanwhile,the deposited transition metals on AG anodes catalyze the electrolyte consumption,lithium plating and active area loss.Finally,these side reactions notably increase cell impedance and electrochemical polarization.Undoubtedly,these findings clearly outline the challenges and optimization direction for high-rate NCM523/AG cells.展开更多
文摘At present,metal ions from spent lithium-ion batteries are mostly recovered by the acid leaching procedure,which unavoidably introduces potential pollutants to the environment.Therefore,it is necessary to develop more direct and effective green recycling methods.In this research,a method for the direct regeneration of anode materials is reported,which includes the particles size reduction of recovered raw materials by jet milling and ball milling,followed by calcination at high temperature after lithium supplementation.The regenerated LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) single-crystal cathode material possessed a relatively ideal layered structure and a complete surface morphology when the lithium content was n(Ni+Co+Mn):n(Li)=1:1.10 at a sintering temperature of 920 0 C,and a sintering time of 12 h.The first discharge specific capacity was 154.87 mA·h·g^(-1) between 2.75 V and 4.2 V,with a capacity retention rate of 90% after 100 cycles.
基金We thank the Natural Science Foundation of Zhejiang Province,China(grant Nos.LQ21B030004 and LQ21E040001)the National Natural Science Foundation of China(grant No.12147219)。
文摘In recent years,researches on improving high-voltage performance of lithium-ion batteries incorporating LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)(NCM523)and artificial graphite(AG)have been widely reported.However,limited attentions have been paid to understand the effects and influence mechanisms of charge and discharge rates and charge limit currents on cyclability of NCM523/AG cells.Herein,a∼1.9 Ah NCM523/AG pouch cell is employed,whose electrochemical and structural evolutions after 800 cycles at various rates are comprehensively investigated.We find that cycling performances are strongly influenced by charge rate,followed by limit current and discharge rate.The cell charged at a high rate and cell charged until reaching a low limit current both exhibit low capacity retentions compared to the cell discharged at a high rate.Possible failure reasons are analyzed by advanced characterizations.Results reveal that NCM523 cathodes of the cells deteriorated early experience severe transition metal dissolution,lattice distortion,and partial phase transformation.Meanwhile,the deposited transition metals on AG anodes catalyze the electrolyte consumption,lithium plating and active area loss.Finally,these side reactions notably increase cell impedance and electrochemical polarization.Undoubtedly,these findings clearly outline the challenges and optimization direction for high-rate NCM523/AG cells.
