Han Mei, Duan Jian, Wang Zhongqiang, Wu Wangyan, Luo Wei
Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai, 201804, P. R. China.
Small. 2023 May;19(19):e2208018. doi: 10.1002/smll.202208018. Epub 2023 Feb 9.
Boosting energy density and reducing the cost of lithium-ion batteries are critical to accelerating their applications in transportation and grid energy storage. Battery design with increasing electrode thickness is an effective way to combine higher energy density and lower cost. However, the evaluation of electrodes with increased thickness is challenging and requires more attention. Here, some pitfalls are to be avoided and a reasonable evaluation strategy is provided for cathode electrodes regarding the choice of counter electrode. Though as the most common counter electrode, lithium metal anode is actually not suitable for evaluating cycling performance, which exhibits fast cell capacity decline, especially, in the case of areal capacity higher than 2 mAh cm . Two commercial anode materials, graphite and Li Ti O (LTO) as the potential alternatives, are systematically evaluated and compared, demonstrating LTO as the more suitable choice. The thick cathode electrode coupled with LTO exhibits excellent rate capability, stable cycling performance, and easy interpretation of charge/discharge profile. The relationship between cell balance and battery performance is further analyzed in detail. This strategy enables a reasonable evaluation of the cathode electrodes and advances the designing of thick electrode.
提高锂离子电池的能量密度并降低其成本对于加速其在交通运输和电网储能中的应用至关重要。增加电极厚度的电池设计是实现更高能量密度和更低成本的有效途径。然而，对厚度增加的电极进行评估具有挑战性，需要更多关注。在此，针对阴极电极在对电极选择方面应避免一些陷阱，并提供合理的评估策略。尽管锂金属阳极作为最常见的对电极，但实际上并不适合评估循环性能，其电池容量会快速下降，特别是在面容量高于2 mAh cm 的情况下。系统地评估和比较了两种商业阳极材料石墨和LiTi O（LTO）作为潜在替代品，结果表明LTO是更合适的选择。与LTO耦合的厚阴极电极表现出优异的倍率性能、稳定的循环性能以及易于解释的充放电曲线。进一步详细分析了电池平衡与电池性能之间的关系。该策略能够对阴极电极进行合理评估，并推动厚电极的设计。
