Assembly of multifunctional Li4Ti5O12@Co3O4 heterostructures for high-performance Li-ion half/full batteries
Assembly of multifunctional Li4Ti5O12@Co3O4 heterostructures for high-performance Li-ion half/full batteries
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DOI：
10.1016/j.jallcom.2020.158110
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发表时间：
2021-03
影响因子：
6.2
通讯作者：
Jiayu Zhang;Siwei Wang;Guobao Xu
中科院分区：
文献类型：
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作者：
Jiayu Zhang;Siwei Wang;Guobao Xu
尖晶石型Li 4 Ti 5 O 12作为一种理想的高倍率负极材料受到了广泛的关注。然而，它仍然受到缺点，包括导电性差，缓慢的Li+扩散和析气问题，导致不令人满意的电化学性能。现在，通过一种简单的自组装策略，合成了一种0 D/2D异质结构，即四氧化钴纳米晶体修饰在Li 4 Ti 5 O 12纳米片上。受益于异质界面效应、抑制析气行为、提高振实密度和改善氧化还原反应动力学，所制备的0 D/2D异质结构在30 C下显示出150 mA h g− 1的上级倍率容量，并且在20 C下测试时在1000次循环后保持130 mA h g− 1的出色循环稳定性。此外，具有所制备的异质结构阳极和商业LiFePO 4阴极的全电池也表现出优异的上级倍率性能（在20 C和30 C下的容量分别为126和110 mA h g− 1）。其优异的电化学性能预示着其在大功率储能领域的应用前景。特别是，我们的工作开发了一种具有成本效益和可扩展的合成方法，并将对构建用于高功率LIB的其他先进电极产生重大影响。
Spinel Li4Ti5O12has been attracted extensive attention as an ideal high-rate anode for potential high-power lithium ion batteries. It, however, is still subjects to weaknesses including poor conductivity, sluggish Li+diffusion and gassing problem, resulting in unsatisfactory electrochemical performance. Now, a 0D/2D heterostructure, cobalt tetraoxide nanocrystals decorated on Li4Ti5O12nanosheets, was synthesized via a facile self-assembly strategy. Benefiting from hetero-interface effect, suppressed gassing behavior, enhanced tap density and improved redox reaction kinetics, the as-prepared 0D/2D heterostructure shows superior rate capacity of 150 mA h g−1at 30 C and outstanding cycling stability of retention a capacity of 130 mA h g−1after 1000 cycles at 20 C when testing as half battery. Furthermore, superior rate properties are also exhibited for the full cell with as-prepared heterostructure anode and commercial LiFePO4cathode (capacities of 126 and 110 mA h g−1at 20 C and 30 C, respectively). The noticeable electrochemical performances indicate their promising application as the advanced anode in high-power energy storage fields. In particular, our work develops a cost-effective and scalable synthesis method and will exert significant impact upon constructing other advanced electrodes for high-power LIBs.