Enabling Long-Term Cycling Stability Within Layered Li-Rich Cathode Materials by O_2/O_3-Type Biphasic Design Strategy

Xin Cao; Jianming Sun; Zhi ChangPengfei WangXiyan YueJun OkagakiPing HeEunjoo YooHaoshen Zhou

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Enabling Long-Term Cycling Stability Within Layered Li-Rich Cathode Materials by O_2/O_3-Type Biphasic Design Strategy

机译：Enabling Long-Term Cycling Stability Within Layered Li-Rich Cathode Materials by O_2/O_3-Type Biphasic Design Strategy

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Typical Li-rich layered oxides are widely regarded as promising cathode candidates for high-energy-density Li-ion batteries because of additional output capacities boosted by oxygen redox activities. However, its commercialized applications are hindered by serious capacity loss and voltage decay related to structural degradation upon cycling. Herein, a Co/Ni-free biphasic O2/O3-type layered cathode material is proposed, Li_(0.9)Li_(0.3)Mn_(0.7)O_2, which has been successfully prepared by the Li+/Na+ ion-exchange strategy and characterized by the XRD Rietveld refinement and SAED as well as HRTEM analyses. O2/O3-type layered cathode material with an approximate composition of 81 O2 and 19 O3 phases are confirmed. Furthermore, the biphasic cathode exhibits a high discharge capacity of 232 mAh g~(?1) with capacity retention of 88.1 after 500 cycles at a current density of 200 mA g~(?1). That is, volume changes of the O3-type phase are effectively restricted during Li~+ (de)intercalations, further enhancing the structural stability and suppressing the formation of spinel phase due to the biphasic structural design. Altogether, these findings prove the biphasic structural design is a feasible strategy to achieve Li-rich cathode materials with high capacity and long-term cycle stability.

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《Advanced functional materials》 |2022年第39期|2205199.1-2205199.7|共7页
作者
Xin Cao; Jianming Sun; Zhi ChangPengfei WangXiyan YueJun OkagakiPing HeEunjoo YooHaoshen Zhou;
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Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology (AIST) 1-1-1, Umezono, Tsukuba 305–8568, Japan;

Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology (AIST) 1-1-1, Umezono, Tsukuba 305–8568, Japan,Graduate School of System and Information Engineering University of Tsukuba 1-1-1, Tennoudai, Tsukuba 305–;

Center of Energy Storage Materials & Technology College of Engineering and Applied Sciences Jiangsu Key Laboratory of Artificial Functional Materials National Laboratory of Solid State Microstructures, and Collaborative Innovation Center of Advanced MicroGraduate School of Science and Technology Hirosaki University 1-Bunkyocho, Hirosaki 036–8560, Japan;

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cathode materials; layered oxides; long cycle life; O2/O3 biphasic;

Enabling Long-Term Cycling Stability Within Layered Li-Rich Cathode Materials by O_2/O_3-Type Biphasic Design Strategy

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