Xenon Ion Implantation Induced Surface Compressive Stress for Preventing Dendrite Penetration in Solid-State Electrolytes.
Xenon Ion Implantation Induced Surface Compressive Stress for Preventing Dendrite Penetration in Solid-State Electrolytes.
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DOI：
10.1002/smll.202108124
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发表时间：
2022-04
期刊：
影响因子：
13.3
通讯作者：
Xuhui Yao;E. Olsson;Manman Wang;Jianan Wang;Q. Cai;N. Peng;R. Webb;Yunlong Zhao
中科院分区：
文献类型：
--
作者：
Xuhui Yao;E. Olsson;Manman Wang;Jianan Wang;Q. Cai;N. Peng;R. Webb;Yunlong Zhao
固态电解质（SSE）已经成为能量密集型锂金属电池复兴的焦点，但仍然面临枝晶穿透引起的失效的挑战。越来越多的证据表明，枝晶贯穿与SSEs的机械失效有关，这要求机械工程解决这个问题。这项工作报告的概念证明，离子注入引起的表面压应力，使电阻在枝晶穿透。使用确定性顺序多离子能量注入来产生压应力，其中注入的负离子分布在距离表面160-600埃的范围内。对称锂电池表明，注入剂量为1013 μ cm-2的颗粒表现出稳定的剥离/电镀周期和延长的寿命，而1012 μ cm-2的较低剂量不能产生足够的应力来防止枝晶穿透，1014 μ cm-2的过量剂量导致结构破坏和应力降低。这种改进的性能归因于诱导的表面压应力在晶粒上的平衡，这是由掠入射衍射技术证实的。作者的努力证明了表面压应力抑制枝晶渗透的有用性，提供了更多的洞察力，而不是经验优化的合理的应力应变工程。
Solid-state electrolytes (SSEs) have been thrust into the limelight for the revival of energy-dense lithium metal batteries, but still face the challenge of failure caused by the dendrite penetration. Mounting evidence indicates that dendrite penetration is related to the mechanical failure in SSEs, which calls for mechanical engineering to tackle this problem. This work reports a proof of concept that ion implantation induced surface compressive stress enables resistance in the dendrite penetration. A deterministic sequential multiple ion energies implantation is used to generate compressive stress, with implanted Xe ions distributed in a range of 160-600 Å from the surface. The symmetric lithium cells show that pellets with an implantation dose of 1013 Xe cm-2 exhibit stable stripping/plating cycles and extended lifespan, while a lower dose of 1012 Xe cm-2 cannot create sufficient stress to prevent dendrite penetration, and an excessive dose of 1014 Xe cm-2 leads to structural destruction and a decrease in stress. This improved performance is attributed to the induced surface compressive stress balanced over crystal grains, which is confirmed by grazing incidence diffraction techniques. The author's efforts demonstrate the usefulness of surface compressive stress to suppress dendrite penetration, offering more insight into rational stress-strain engineering as opposed to empirical optimization.