High chemical reactivity, large volume changes, and uncontrollable lithium dendrite growth have always been the key problems of lithium metal anodes.Coating has been demonstrated as an effective strategy to protect th...High chemical reactivity, large volume changes, and uncontrollable lithium dendrite growth have always been the key problems of lithium metal anodes.Coating has been demonstrated as an effective strategy to protect the lithium metal.In this work, the effects of polyacrylonitrile(PAN)-based coatings on electrodeposited lithium have been studied.Our results show that a PAN coating layer provides uniform and dendrite-free lithium deposition as well as better cycling performance with carbonate electrolyte.Notably, heat treatment of the PAN coating layer promotes the formation of larger deposit particle size and higher coulombic efficiency(85%).The compact coating layer of heat-treated PAN with a large Young modulus(82.7 GPa) may provide stable protection for the active lithium.Improved homogeneity of morphology and mechanical properties of heat-treated PAN contribute to the larger deposit particles.This work provides new feasibility to optimize the polymer coating through rational modification of polymers.展开更多
Tom King is my good friend. He works hard at his lessons. He is one of the best students in our class. He likes basketball and football. We often play together.There are four people in his family. His father worked on...Tom King is my good friend. He works hard at his lessons. He is one of the best students in our class. He likes basketball and football. We often play together.There are four people in his family. His father worked on a farm three years ago, but now he is a manager of a company in Beijing. His mother is an English teacher of a college and his brother is a worker. The Kings have been in Beijing for three years since they came to work in China.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.51822211 and 51802342)the State Grid Technology Project,China(Grant No.DG71-17-010)
文摘High chemical reactivity, large volume changes, and uncontrollable lithium dendrite growth have always been the key problems of lithium metal anodes.Coating has been demonstrated as an effective strategy to protect the lithium metal.In this work, the effects of polyacrylonitrile(PAN)-based coatings on electrodeposited lithium have been studied.Our results show that a PAN coating layer provides uniform and dendrite-free lithium deposition as well as better cycling performance with carbonate electrolyte.Notably, heat treatment of the PAN coating layer promotes the formation of larger deposit particle size and higher coulombic efficiency(85%).The compact coating layer of heat-treated PAN with a large Young modulus(82.7 GPa) may provide stable protection for the active lithium.Improved homogeneity of morphology and mechanical properties of heat-treated PAN contribute to the larger deposit particles.This work provides new feasibility to optimize the polymer coating through rational modification of polymers.
文摘Tom King is my good friend. He works hard at his lessons. He is one of the best students in our class. He likes basketball and football. We often play together.There are four people in his family. His father worked on a farm three years ago, but now he is a manager of a company in Beijing. His mother is an English teacher of a college and his brother is a worker. The Kings have been in Beijing for three years since they came to work in China.
