【摘 要】
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Main observation and conclusionrnAnode materials based on conversion reactions usually possess high energy densities for lithium-ion batteries (LIBs).However,they suffer from poor rate performance and cycle life due to serious volume changes.Herein,α/β-Co
【机 构】
：
College of Chemistry and Materials Science,and Guangdong Provincial Key Laboratory of Functional Sup
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Main observation and conclusionrnAnode materials based on conversion reactions usually possess high energy densities for lithium-ion batteries (LIBs).However,they suffer from poor rate performance and cycle life due to serious volume changes.Herein,α/β-CoMoO4 heterogeneous nanorods are synthesized via a facile co-precipitation method,and further are phase-engineered through varying calcination temperature,accom-plishing the obviously improved cycle life and rate performance as anodes for LIBs.When evaluated at a current density of 1.0 A·g-1,the optimal nanorods with an α/β phase ratio of 6.0 afford the reversible capacity of 1143.6 mAh·g-1 after 200 cycles,outperforming most of recently reported bimetal oxides.Li+ storage mechanism is further analyzed by using in-situ X-ray diffraction and ex-situ tran-sition electronic microscopy.It\'s revealed that β-CoMoO4 follows a one-step conversion reaction;while α-CoMoO4 proceeds an inter-calation pathway before the conversion reaction.Grading storage of Li+ would alleviate the volume effect of heterostructured α/β-CoMoO4,forming electronically conductive network evenly composed of Co and Mo nanograins to enable the reversible electro-chemical conversion.This work is anticipated to give some hints for the rational design of high-performance energy materials.
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