Layered alkali-metal titanate materials are considered as attractive anodes for sodium ion batteries due to their favorable safety and low cost.However,their practical implementation faces major challenges of low electronic conductivity and inevitable volume variation during Na+intercalation and de-intercalation,which are generally difficult to conquer by a single modification method.Herein,a synergistically enhancing strategy to promote the electrochemical performance of Na2Ti2O5 nanowire array anode via simultaneous hydrogenation and carbon coating is developed.Hydrogenation leads to par-tially reduced titanium;together with conductive carbon layer,it endows Na2Ti2O5 with fast electron transport and structural stability.The resulting H-Na2Ti2O5@C anode exhibits enhanced rate capability(8.0C,165 mAh·g-1)and stable cycle performance up to 1000 times in sodium-ion half-cells(the capacity of H-Na2Ti2O5 without carbon fades drastically after only 100 cycles).In addition,a new-coupling full cell is further designed with graphene hybridized high-voltage Na3(VO0.5)2(PO4)2F2 as cathode,capable of delivering a high specific energy density of 212.1 Wh·kg-1(based on the mass of both anode and cathode)and good rate and cycling stability.This work may offer inspiration for synergistic optimization of elec-trode materials for advanced electrochemical energy stor-age devices.

De-Liang Ba;Wei-Hua Zhu;Yuan-Yuan Li;Jin-Ping Liu

School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China;School of Chemistry,Chemical Engineering and Life Science,State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;State Center for International Cooperation on Designer Low-Carbon and Environmental Materials and School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China

稀有金属（英文版）

[1]De-Liang Ba;Wei-Hua Zhu;Yuan-Yuan Li;Jin-Ping Liu-.Synergistically enhancing cycleability and rate performance of sodium titanate nanowire anode via hydrogenation and carbon coating for advanced sodium ion batteries)[J].稀有金属（英文版）,2022(12):4075-4085

cycleability,Na+intercalation,Na2Ti2O5,VO0,2F2

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