Pathways toward Improved Performance of NCM523 Pouch Cell via Incorporating Low-Cost Al2O3 and Graphene,ACS Applied Energy Materials

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Pathways toward Improved Performance of NCM523 Pouch Cell via Incorporating Low-Cost Al2O3 and Graphene
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-10-16 , DOI: 10.1021/acsaem.0c01912
Yongcong Huang _{1,

2,

3} , Qian Liu _{1,

2,

3} , Lan Chen _{1,

2,

3} , Jianming Tao _{1,

2,

3} , Guiying Zhao _{1,

2,

3} , Yue Chen _{1,

2,

3} , Jiaxin Li _{1,

2,

3,

4} , Yingbin Lin _{1,

2,

3} , Zhigao Huang _{1,

2,

3}

Affiliation

Improving the holistic capability for lithium-ion batteries (LIBs) using an efficient and convenient approach with a minimum cost increase remains one of the most urgent and challenging issues for LIB industrialization. This work delivers such an approach via an extremely simple path. Low-cost reagents of Al₂O₃ and graphene sheets (Gs) are used as additives for LiNi₀₅Co_0.2Mn_0.3O₂ (NCM523)∥graphite pouch cells. Interestingly, with very low concentrations (only 1.0 and 0.5 wt % for Al₂O₃ and graphene), additives enable dramatically improved LIB performance, from cyclic stability, energy density, to thermal safety. The assembled cell of NCM523-Al₂O₃-Gs∥graphite delivered a capacity retention of 76.9% at 3.0 C after 400 cycles (cf. only 73.6% for a pure NCM cell). More significantly, the heat generation during the discharging under 3.0 C and safety tests are both superior to those of a pure NCM cell. It is proven that the excellent LIB performance benefits from the co-effect of additives of Al₂O₃ and Gs, which not only inhibit the structure failure and enhance conductance of materials but also optimize the interface compatibility of an electrolyte and slow down the thermal runaway possibility, especially at high rates and elevated temperatures. This work provides a powerful and convenient solution for the commercial achievement of high-performance LIBs.

中文翻译：

通过掺入低成本Al ₂ O ₃和石墨烯改善NCM523袋式电池性能的途径

使用高效且便捷的方法以最小的成本增加来提高锂离子电池（LIB）的整体能力，仍然是LIB工业化过程中最紧迫且最具挑战性的问题之一。这项工作通过非常简单的途径提供了这种方法。低成本的Al ₂ O ₃试剂和石墨烯片（Gs）用作LiNi ₀₅ Co _0.2 Mn _0.3 O ₂（NCM523）∥石墨袋电池的添加剂。有趣的是，浓度非常低（Al ₂ O ₃仅1.0和0.5 wt％和石墨烯），添加剂可从循环稳定性，能量密度到热安全性，显着提高LIB性能。NCM523-Al ₂ O ₃ -Gs石墨组装电池在400个循环后在3.0 C下的容量保持率为76.9％（纯NCM电池仅占73.6％）。更重要的是，在3.0 C下放电过程中产生的热量和安全性测试均优于纯NCM电池。事实证明，优异的LIB性能得益于Al ₂ O ₃添加剂的共同作用和Gs，不仅可以抑制结构破坏并提高材料的电导率，而且还可以优化电解质的界面相容性并减慢热失控的可能性，尤其是在高速率和高温下。这项工作为高性能LIB的商业实现提供了强大而便捷的解决方案。

更新日期：2020-11-23

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