Pierre Mwizerwa Jean, Liu Changyong, Xu Kun, Zhao Ning, Li Yide, Chen Zhangwei, Shen Jun
Additive Manufacturing Institute, College of Mechatronics & Control Engineering, Shenzhen University, Shenzhen 518060, China; College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Additive Manufacturing Institute, College of Mechatronics & Control Engineering, Shenzhen University, Shenzhen 518060, China; Guangdong Key Laboratory of Electromagnetic Control and Intelligent Robots, College of Mechatronics & Control Engineering, Shenzhen University, 518060, China.
J Colloid Interface Sci. 2022 Oct;623:168-181. doi: 10.1016/j.jcis.2022.05.030. Epub 2022 May 10.
Three-dimensional (3D) printing of Li-ion batteries with unconventional 3D electrodes has attracted considerable attention in recent years. However, fabricating 3D electrodes with high specific capacity, high areal capacity, ultralong cycling stability, and improved rate performance remains a challenge to date. Novel 3D grid-patterned LiFePO@MgO composite electrodes with thicknesses of 143, 306, and 473 μm were fabricated via 3D printing. The electrochemical performance of half cells was evaluated. The 3D-printed LiFePO@MgO (143 μm) electrodes exhibit stable specific capacities of 142.8 mAh g @ 1.0 C and 90.3 mAh g @ 10.0 C after 800 and 1700 cycles, respectively. In addition, the 473 μm-thick 3D grid-patterned LiFePO@MgO achieves an areal capacity of 3.01 mAh cm @ 0.1 C after 20 cycles. The full cells comprised 143 μm-thick 3D-printed LiFePO@MgO, and 217 μm LiTiO electrodes show a capacity of 139.0 mAh g @ 1.0 C after 400 cycles. These results indicate that, this type of thick 3D-printed LiFePO@MgO electrode achieves high capacity, high-rate capability, and ultralong cycle stability. The outstanding performance ascribes the fast electrolyte infusion of 3D-printed electrodes and the enhanced electronic/ionic transport.
近年来，采用非常规3D电极的锂离子电池3D打印技术备受关注。然而，制造具有高比容量、高面积容量、超长循环稳定性和改善倍率性能的3D电极至今仍是一项挑战。通过3D打印制备了厚度分别为143、306和473μm的新型3D网格图案化LiFePO@MgO复合电极。对半电池的电化学性能进行了评估。3D打印的LiFePO@MgO（143μm）电极在800次和1700次循环后，分别在1.0C和10.0C下表现出稳定的比容量，分别为142.8 mAh g和90.3 mAh g。此外，473μm厚的3D网格图案化LiFePO@MgO在20次循环后，在0.1C下的面积容量达到3.01 mAh cm。由143μm厚的3D打印LiFePO@MgO和217μm LiTiO电极组成的全电池在400次循环后，在1.0C下的容量为139.0 mAh g。这些结果表明，这种类型的厚3D打印LiFePO@MgO电极实现了高容量、高倍率性能和超长循环稳定性。其优异的性能归因于3D打印电极快速的电解液注入以及增强的电子/离子传输。
