锂离子电池中位错对驱动力和应变能的影响  

Effect of dislocation on driving force and strain energy in lithium-ion battery

作　　者：刘通 周剑秋[1] 戴兆祥 LIU Tong;ZHOU Jian-qiu;DAI Zhao-xiang(School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing Jiangsu 210009,China)

机构地区：[1]南京工业大学机械与动力工程学院,江苏南京210009

出　　处：《电源技术》2018年第10期1469-1472,共4页Chinese Journal of Power Sources

基　　金：江苏省支撑项目(BE2009170);国家自然科学基金(10872087;11272143);湖北省优秀中青年人才项目(Q20111501);霍英东青年教师基金(101005)

摘　　要：电极在锂化过程中通常被分为一个未锂化相和一个完全锂化相。驱动力可以看作是自由能的变化量,并且会影响锂化反应。首次提出了位错和驱动力耦合作用,并通过能量公式讨论了恒流和恒压两种状态下位错应力对驱动力的影响。除此之外,还研究了位错能量对总能量的影响以及不同泊松比条件下的位错能量。结果表明恒压操作状态下驱动力的变化远大于恒流操作状态,而位错的存在会使驱动力变为负值,从而提高反应速度。The electrode is separated into an unlithiated phase and a fully-lithiated phase during lithiation.The net change in the free energy represents driving force that effects lithiation reaction.A dislocation model coupled with driving force was firstly proposed.The effects of the stress on the electrochemical reaction under either galvanostatic or potentiostatic operation were discussed.What's more,the influence of dislocation energy on total energy,and the influence of poisson's ratio on the dislocation energy under potentiostatic operation were discussed.The result shows that the effect of potentiostatic operation on driving force is much larger than galvanostatic operation.In addition,dislocation-induced stress can make the driving force change to negative value which is conducive to enhance the reaction speed.

关 键 词：位错诱导应力 驱动力 应变能 球形电极 

分 类 号：TM912[电气工程—电力电子与电力传动]