Electrochemical lithiation/delithiation of electrodes induces chemical strain cycling that causes fatigue and other harmful influences on lithium-ion batteries.In this work,a homemade in situ measurement device was us...Electrochemical lithiation/delithiation of electrodes induces chemical strain cycling that causes fatigue and other harmful influences on lithium-ion batteries.In this work,a homemade in situ measurement device was used to characterize simultaneously chemical strain and nominal state of charge,especially residual chemical strain and residual nominal state of charge,in graphite-based electrodes at various temperatures.The measurements indicate that raising the testing temperature from 20℃ to 60℃ decreases the chemical strain at the same nominal state of charge during cycling,while residual chemical strain and residual nominal state of charge increase with the increase of temperature.Furthermore,a novel electrochemicalmechanical model is developed to evaluate quantitatively the chemical strain caused by a solid electrolyte interface(SEI)and the partial molar volume of Li in the SEI at different temperatures.The present study will definitely stimulate future investigations on the electro-chemo-mechanics coupling behaviors in lithium-ion batteries.展开更多
Electrochemical lithiation/delithiation of electrodes induces chemical strain cycling that causes fatigue and other harmful influences on lithium-ion batteries.In this work,a homemade in situ measurement device was us...Electrochemical lithiation/delithiation of electrodes induces chemical strain cycling that causes fatigue and other harmful influences on lithium-ion batteries.In this work,a homemade in situ measurement device was used to characterize simultaneously chemical strain and nominal state of charge,especially residual chemical strain and residual nominal state of charge,in graphite-based electrodes at various temperatures.The measurements indicate that raising the testing temperature from 20℃ to 60℃ decreases the chemical strain at the same nominal state of charge during cycling,while residual chemical strain and residual nominal state of charge increase with the increase of temperature.Furthermore,a novel electrochemicalmechanical model is developed to evaluate quantitatively the chemical strain caused by a solid electrolyte interface(SEI)and the partial molar volume of Li in the SEI at different temperatures.The present study will definitely stimulate future investigations on the electro-chemo-mechanics coupling behaviors in lithium-ion batteries.展开更多
基金supported by research grants from the National Key R&D Program of China(No.2017YFB0701604)Guangdong Basic and Applied Basic Research Foundation(No.2020A1515110798)+1 种基金Shenzhen Science and Technology Program(Grant No.RCBS20200714114920129)S.Sun also acknowledges the National Natural Science Foundation of China(Grant Nos.11672168 and 12072179)for financial support.
文摘Electrochemical lithiation/delithiation of electrodes induces chemical strain cycling that causes fatigue and other harmful influences on lithium-ion batteries.In this work,a homemade in situ measurement device was used to characterize simultaneously chemical strain and nominal state of charge,especially residual chemical strain and residual nominal state of charge,in graphite-based electrodes at various temperatures.The measurements indicate that raising the testing temperature from 20℃ to 60℃ decreases the chemical strain at the same nominal state of charge during cycling,while residual chemical strain and residual nominal state of charge increase with the increase of temperature.Furthermore,a novel electrochemicalmechanical model is developed to evaluate quantitatively the chemical strain caused by a solid electrolyte interface(SEI)and the partial molar volume of Li in the SEI at different temperatures.The present study will definitely stimulate future investigations on the electro-chemo-mechanics coupling behaviors in lithium-ion batteries.
基金supported by research grants from the National Key R&D Program of China(No.2017YFB0701604)Guangdong Basic and Applied Basic Research Foundation(No.2020A1515110798)+1 种基金Shenzhen Science and Technology Program(Grant No.RCBS20200714114920129)S.Sun also acknowledges the National Natural Science Foundation of China(Grant Nos.11672168 and 12072179)for financial support.
文摘Electrochemical lithiation/delithiation of electrodes induces chemical strain cycling that causes fatigue and other harmful influences on lithium-ion batteries.In this work,a homemade in situ measurement device was used to characterize simultaneously chemical strain and nominal state of charge,especially residual chemical strain and residual nominal state of charge,in graphite-based electrodes at various temperatures.The measurements indicate that raising the testing temperature from 20℃ to 60℃ decreases the chemical strain at the same nominal state of charge during cycling,while residual chemical strain and residual nominal state of charge increase with the increase of temperature.Furthermore,a novel electrochemicalmechanical model is developed to evaluate quantitatively the chemical strain caused by a solid electrolyte interface(SEI)and the partial molar volume of Li in the SEI at different temperatures.The present study will definitely stimulate future investigations on the electro-chemo-mechanics coupling behaviors in lithium-ion batteries.
