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Mg,ti-base surface integrated layer and bulk doping to suppress lattice oxygen evolution of Ni-rich cathode material at a high cut-off voltage

引用

Journal of Energy Chemistry 2022年第8期31卷 434-444,I0012页

作者： Fan Peng Youqi Chu Yu Li Qichang Pan Guangchang Yang Lixuan Zhang Sijiang Hu Fenghua Zheng Hongqiang Wang Qingyu Li Guangxi Key Laboratory of Low Carbon Energy Materials School of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004GuangxiChina Guangxi New Energy Ship Battery Engineering Technology Research Center Guangxi Normal UniversityGuilin 541004GuangxiChina

The Nickel-rich layered cathode materials charged to 4.5 V can obtain a specific capacity of more than 200 m Ah g^(-1).However,the nickel-rich layered cathode materials suffer from the severe capacity fade during high-voltage cycling,which is related to the phase transformation and the surface sides reactions caused by the lattice oxygen ***,the simultaneous construction of a Mg,ti-based surface integrated layer and bulk doping through Mg,ti surface treatment could suppress the lattice oxygen evolution of Nirich material at deep *** importantly,Mg and ti are co-doped into the particles surface to form an Mg_(2)tiO_(4) and Mg_(0.5–x)ti_(2–y)(PO_(4))_(3) outer layer with Mg and ti *** the constructed surface integrated layer,the reverse electric field in the Mg_(2)tiO_(4) effectively suppressed the outward migration of the lattice oxygen anions,while Mg_(0.5–x)ti_(2–y)(PO_(4))_(3) outer layer with high electronic conductivity and good lithium ion conductor could effectively maintained the stability of the reaction interface during highvoltage ***,bulk Mg and ti co-doping can mitigate the migration of Ni ions in the bulk to keep the stability of transition metal–oxygen(M-O)bond at deep *** a result,the NCM@MTP cathode shows excellent long cycle stability at high-voltage charging,which keep high capacity retention of 89.3%and 84.3%at 1 C after 200 and 100 cycles under room and elevated temperature of 25 and 55°C,*** work provides new insights for manipulating the surface chemistry of electrode materials to suppress the lattice oxygen evolution at high charging voltage.

关键词： Ni-rich layered oxide Mg ti-base surface integrated layer Bulk doping Lattice oxygen evolution

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