首页|Femtosecond laser fabrication of 3D vertically aligned micro-pore network on thick-film Li4Ti5O12 electrode for high-performance lithium storage

Femtosecond laser fabrication of 3D vertically aligned micro-pore network on thick-film Li4Ti5O12 electrode for high-performance lithium storage

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The development of energy storage devices with high energy density relies heavily on thick film elec-trodes,but it is challenging due to the limited ion transport kinetics inherent in thick electrodes.Here,we report on the preparation of a directional vertical array of micro-porous transport networks on LTO electrodes using a femtosecond laser processing strategy,enabling directional ion rapid transport and achieving good electrochemical performance in thick film electrodes.Various three-dimensional(3D)vertically aligned micro-pore networks are innovatively designed,and the structure,kinetics character-istics,and electrochemical performance of the prepared ion transport channels are analyzed and dis-cussed by multiple characterization and testing methods.Furthermore,the rational mechanisms of electrode performance improvement are studied experimentally and simulated from two aspects of structural mechanics and transmission kinetics.The ion diffusion coefficient,rate performance at 60 C,and electrode interface area of the laser-optimized 60-15％micro-porous transport network electrodes increase by 25.2 times,2.2 times,and 2.15 times,respectively than those of untreated electrodes.Therefore,the preparation of 3D micro-porous transport networks by femtosecond laser on ultra-thick electrodes is a feasible way to develop high-energy batteries.In addition,the unique micro-porous trans-port network structure can be widely extended to design and explore other high-performance energy materials.

Femtosecond laserMicro-porous transport networksLaser processingThick film electrodesIon transport kinetics

Quansheng Li、Xiaofei Sun、Xuesong Mei、Lingzhi Wang、Minxing Yang、Jianlei Cui、Wenjun Wang

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State Key Laboratory for Manufacturing System Engineering,Xi'an Jiaotong University,Xi'an 710049,Shaanxi,China

Shaanxi Key Laboratory of Intelligent Robots,Xi'an Jiaotong University,Xi'an 710049,Shaanxi,China

School of Mechanical Engineering,Xi'an Jiaotong University,Xi'an 710049,Shaanxi,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key Research and Development Program of ChinaKey Research and Development Projects of Shaanxi Province,China

52275463517722402021YFB33020002018ZDXM-GY-135

2024

10.1016/j.jechem.2024.03.045

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.95(8)