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Mitigating Overcharge in Ampere-Hour-Level Anode-Free Pouch Cells by Improving Pressure Uniformity
ACS Energy Letters ( IF 19.3 ) Pub Date : 2024-08-09 , DOI: 10.1021/acsenergylett.4c01569 Hao Yang 1 , Xuyang Liu 1 , Jing Zheng 2 , Wei Yao 2 , Kai Fang 2 , Xianquan Lai 2 , Guangyu Zhai 2 , Mengjie Wu 2 , Gaofei Li 2 , Wei Luo 1
ACS Energy Letters ( IF 19.3 ) Pub Date : 2024-08-09 , DOI: 10.1021/acsenergylett.4c01569 Hao Yang 1 , Xuyang Liu 1 , Jing Zheng 2 , Wei Yao 2 , Kai Fang 2 , Xianquan Lai 2 , Guangyu Zhai 2 , Mengjie Wu 2 , Gaofei Li 2 , Wei Luo 1
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Anode-free batteries have gained significant attention due to their high energy density and low cost. Stack pressure is a key factor determining Li deposition morphology and, hence, Coulombic efficiency and cycle life in anode-free batteries. However, how the pressure uniformity affects the Li deposition process is poorly understood. Here we develop an ampere-hour-level anode-free pouch cell with a high energy density of 415 Wh/kg by directly integrating a LiCoO2 cathode and a Cu foil anode. We find that a nearly 3 times higher Li deposition density can be enabled by a high pressure, while overcharge occurs if the pressure is not uniform. Using an additional soft layer to disperse the pressure, the Li deposition has been further densified and the overcharge phenomenon can be lessened. Therefore, the anode-free pouch cell (2.22 Ah) can deliver a capacity retention rate of 70% after 100 cycles. We expect our observation can be transferred to practical Li metal batteries as well.
中文翻译：
通过改善压力均匀性来缓解安时级无阳极软包电池的过充电
无阳极电池由于其高能量密度和低成本而受到广泛关注。堆压是决定锂沉积形态的关键因素，因此也是决定无阳极电池库仑效率和循环寿命的关键因素。然而，人们对压力均匀性如何影响锂沉积过程知之甚少。在这里，我们通过直接集成LiCoO 2正极和铜箔负极，开发了一种安时级无阳极软包电池，其能量密度高达415 Wh/kg。我们发现，高压可以使锂沉积密度提高近3倍，而如果压力不均匀，就会发生过充电。使用额外的软层来分散压力，锂沉积进一步致密化，可以减少过充现象。因此，无阳极软包电池（2.22 Ah）在100次循环后容量保持率为70%。我们希望我们的观察也可以转移到实际的锂金属电池中。
更新日期：2024-08-09
中文翻译：
通过改善压力均匀性来缓解安时级无阳极软包电池的过充电
无阳极电池由于其高能量密度和低成本而受到广泛关注。堆压是决定锂沉积形态的关键因素，因此也是决定无阳极电池库仑效率和循环寿命的关键因素。然而，人们对压力均匀性如何影响锂沉积过程知之甚少。在这里，我们通过直接集成LiCoO 2正极和铜箔负极，开发了一种安时级无阳极软包电池，其能量密度高达415 Wh/kg。我们发现，高压可以使锂沉积密度提高近3倍，而如果压力不均匀，就会发生过充电。使用额外的软层来分散压力，锂沉积进一步致密化，可以减少过充现象。因此，无阳极软包电池（2.22 Ah）在100次循环后容量保持率为70%。我们希望我们的观察也可以转移到实际的锂金属电池中。
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