Superior wide-temperature lithium storage in a porous cobalt vanadate

Lithium ion batteries(LIBs)that can be operated under extended temperature range hold significant application potentials.Here in this work,we successfully synthesized Co2V2O7 electrode with rich porosity from a facile hydrothermal and combustion process.When applied as anode for LIBs,the electrode displayed excellent stability and rate performance in a wide range of temperatures.Remarkably,a stable capacity of 206 mAhg 1 was retained after cycling at a high current density of 10 A·g-1 for 6,000 cycles at room temperature(25℃).And even when tested under extreme conditions,i.e.,-20 and 60℃,the battery still maintained its remarkable stability and rate capability.For example,at-20℃,a capacity of 633 mAh·g 1 was retained after 50 cycles at 0.1 A·g 1;and even after cycling at 60℃ at 10 A·g-1 for 1,000 cycles,a reversible capacity of 885 mAh·g-1 can be achieved.We believe the development of such electrode material will fciliate progress of the next-generation LIBs with wide operating windows.