激光蚀刻负极片对锂离子电池性能的影响  

Effect of laser etched anode electrode on the performance of lithium-ion batteries

作　　者：余正发 侯亚男 YU Zhengfa;HOU Yanan(Zhuhai COSMX Battery Co.,Ltd.,Zhuhai,Guangdong Province,519180,China;School of Applied Chemistry and Materials,Zhuhai College of Science and Technology,Zhuhai,Guangdong Province,519040,China)

机构地区：[1]珠海冠宇电池股份有限公司,广东珠海519180 [2]珠海科技学院应用化学与材料学院,广东珠海519040

出　　处：《电池工业》2023年第6期285-288,共4页Chinese Battery Industry

摘　　要：厚电极技术可以有效提升锂离子电池中正极及负极活性物质的占比,降低隔膜及集流体非活性物质的占比,进而有效提升锂离子电池的能量密度。但锂离子电池电极厚度的增加会导致电荷(电子及离子)传输距离及阻抗增加、负极片动力学恶化,进而严重影响锂离子电池循环寿命。通过激光蚀刻后的负极片,可以增加极片表面的孔隙,并增加石墨颗粒表面的锂离子脱嵌通道,有效改善负极片的动力学性能。与辊压后的负极片形成的锂离子电池相比,激光蚀刻负极片形成的锂离子电池在常温下的循环寿命提升了87%,在45℃下的循环寿命提升了37%。Thick electrode design strategies can effectively increase the active material loading(cathode and anode)and decrease the inactive component ratio(current collector and separator)of lithium-ion batteries,thereby leading to increased battery energy density.However,increasing the electrode thickness of lithium-ion battery will inevitably result in a proportional increase in charge(electrons and ions)transport distance and transport resistance,and cause sluggish kinetics for anode electrode,which may have bad effect on the cycle life of lithium-ion battery.Electrode surface porosity and passway for lithium-ion transport increases by laser etching,which improves kinetics of anode electrode.Compared with the base lithium-ion battery with pristine anode electrode,lithium-ion battery assembled with the laser etched anode electrode reveals prolonged cycle life of 87%at room temperature and 37%at 45 degrees.

关 键 词：锂离子电池 负极片 激光 循环寿命 造孔 

分 类 号：TM911[电气工程—电力电子与电力传动]