Opening twisted polymer chains for simultaneously high printability and battery fast-charge
Opening twisted polymer chains for simultaneously high printability and battery fast-charge
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DOI：
10.1016/j.ensm.2022.11.025
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发表时间：
2022-11-25
影响因子：
20.4
通讯作者：
Zhu，Hongli
中科院分区：
文献类型：
--
作者：
Wang，Ying;He，Jinlong;Zhu，Hongli
快速充电是广泛采用基于电池的电动汽车的关键。然而，通过架构优化来改善快速充电是昂贵的。为了降低成本并扩大商业化，我们应用了卷对卷丝网印刷技术来创建通道并减少电极的弯曲度。这项工作首次成功地打开了高固体含量油墨中的扭曲聚合物链，以改善其丝网印刷适性和印刷电极的电池性能。以LiNi0.6Mn0.2Co0.2O2为活性物质，打开扭曲的粘结剂链后，固含量为60%的油墨具有上级的丝网印刷适性。印刷电极在6C下的充电容量比质量负载为6.5 mg/cm 2的具有链扭曲油墨的印刷电极高33%。此外，粗粒度的分子动力学模拟进行了系统的研究潜在的机制。新的油墨制备过程为制造丝网印刷电池油墨提供了可扩展的有效策略，并促进了丝网印刷电极技术。
Fast-charging is key to the widespread adoption of battery-based electric vehicles. However, improving fast-charging through architecture optimization is expensive. To reduce costs and expand to commercialization, we applied roll-to-roll screen printing technology to create channels and decrease the tortuosity of electrodes. For the first time, this work successfully opened twisted polymer chains within high-solid-content inks to improve their screen printability and battery performance of as-printed electrodes. With LiNi0.6Mn0.2Co0.2O2as active materials, the 60% solid content ink presents superior screen printability after opening the twisted binder chains. As-printed electrode exhibits 33% higher charge capacity at 6 C than printed electrode with chains twisted ink at mass loading of 6.5 mg/cm2. Furthermore, coarse-grained molecular dynamics simulations are performed to study the underlying mechanism systematically. The new ink preparation procedure provides a scalable, effective strategy for manufacturing screen-printable battery ink and promotes screen-printed electrode technology.