Zhang Xue-Ying, Zhang Yong, Gao Yong, Zhao Hong
Department of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, China.
Institute of Science and Technology for New Energy, Xi'an Technological University, Xi'an 710021, Shannxi, China.
Chem Commun (Camb). 2023 Nov 14;59(91):13591-13594. doi: 10.1039/d3cc04217k.
Due to its high theoretical capacity and low anode potential advantages, lithium is becoming the ideal high-capacity anode of next generation batteries. Nevertheless, the satisfactory long-term cyclability of lithium metal batteries is still not achieved. Inspired by the intrinsic soft nature of the lithium metal, we have developed a simple room temperature solid-state deformation route to overcome the lithium dendrite issue, and the cycle life of the deformation treated lithium anode is 5 times that of the untreated lithium anode. It is demonstrated that microscale lithium grains are divided into nanoscale lithium grains by directional friction forces of solid-state deformation. The lithium grain boundaries are lithiophilic active sites towards Li ions, which regulate homogeneous deposition of Li ions to form a thin and stable SEI film, eventually overcoming the lithium dendrite issue and enhancing the cyclability of lithium batteries. Overcoming the challenges in conventional tedious chemical routes to grow high-density grain boundary active sites for catalysis, the room temperature solid-state deformation route will pave a new road to grow high-density grain boundaries for fuel cells and metal-based batteries.
由于锂具有高理论容量和低阳极电位的优势，它正成为下一代电池理想的高容量阳极。然而，锂金属电池仍未实现令人满意的长期循环稳定性。受锂金属固有柔软特性的启发，我们开发了一种简单的室温固态变形方法来解决锂枝晶问题，经过变形处理的锂阳极的循环寿命是未处理锂阳极的5倍。结果表明，通过固态变形的定向摩擦力，微米级锂晶粒被分割成纳米级锂晶粒。锂晶界是对锂离子具有亲锂性的活性位点，可调节锂离子的均匀沉积以形成薄而稳定的固体电解质界面（SEI）膜，最终解决锂枝晶问题并提高锂电池的循环稳定性。室温固态变形方法克服了传统繁琐化学路线中生长用于催化的高密度晶界活性位点的挑战，将为燃料电池和金属基电池生长高密度晶界铺平一条新道路。
