{"id":31465,"date":"2020-07-21T18:34:00","date_gmt":"2020-07-21T15:34:00","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/li-ions-transport-across-electrolytes-and-sei\/"},"modified":"2020-07-21T18:34:00","modified_gmt":"2020-07-21T15:34:00","slug":"li-ions-transport-across-electrolytes-and-sei","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/li-ions-transport-across-electrolytes-and-sei\/","title":{"rendered":"#Li-ions transport across electrolytes and SEI"},"content":{"rendered":"

“#Li-ions transport across electrolytes and SEI<\/strong>”<\/p>\n

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\"battery\"<\/img>
\n Credit: CC0 Public Domain
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The kinetics of Li-ions transport across the electrolyte and the SEI is usually the rate-determining step in the Li plating-strip<\/a>ping process. Before electroplating on the anode surface, Li-ions migrate from a cathode to an anode through pores in a separator that is filled with electrolytes. The Li metal surface facing the pores in the separator becomes enriched with Li-ions due to their accumulation inside the pores. Thus, the fresh Li metal selectively deposits on these regions with a higher concentration of Li-ions, forming an uneven Li metal surface, as well as dendritic Li growth.<\/p>\n

Recently, the research group of Professor Hengxing Ji of the University of Science<\/a> and Technology<\/a> of China presents a coating layer formed by COF-LZU1 particles on a commercial polypropylene (PP) separator to redistribute the Li-ions passing through the PP pores.<\/p>\n

The interlayer comprises closely packed particles of a Schiff-base covalent organic framework (COF) COF-LZU1, which is an electronic insulator with a high chemical and thermal stability containing well-aligned channels of ~1.8 nm in diameter. The nanochannels in the COF-LZU1 particles in the coating layer hinder the migration of anions between the electrodes, leading to a high Li-ion transference number of 0.77\u00b10.01, which has long been considered to increase the energy efficiency of Li batteries.
\nIn addition, Li-ions move through the COF-LZU1 layer, analogous to beads passing through a Galton Board. This process, for a large number of beads, statistically app<\/a>roximates the normal distribution. In this regard, the COF-LZU1 layer serves to effectively redistribute the Li-ions that pass through the pores of the commercial separator so as to yield a uniform distribution, which can transform the mossy or dendritic Li to a smooth Li deposition, rendering improved battery performances. The mechanism of the behaviors of the COF-LZU1 layer can be extended to different types of porous materials to regulate ion distributions in different energy storage or conversion systems.<\/p>\n

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More information:<\/strong>
\n Huanyu Xie et al, Redistribution of Li-ions using covalent organic frameworks towards dendrite-free lithium anodes: a mechanism based on a Galton Board, Science China Chemistry<\/i> (2020). DOI: 10.1007\/s11426-020-9796-9<\/p>\n

\n Citation<\/strong>:
\n Li-ions transport across electrolytes and SEI (2020, July 21)
\n retrieved 21 July 2020
\n from https:\/\/phys.org\/news<\/a>\/2020-07-li-ions-electrolytes-sei.html<\/p>\n

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“#Li-ions transport across electrolytes and SEI” Credit: CC0 Public Domain The kinetics of Li-ions transport across the electrolyte and the SEI is usually the rate-determining step in the Li plating-stripping process. Before electroplating on the anode surface, Li-ions migrate from a cathode to an anode through pores in a separator that is filled with electrolytes….<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[16],"tags":[41944,10601],"class_list":["post-31465","post","type-post","status-publish","format-standard","hentry","category-sciencee","tag-li-ions-transport-across-electrolytes-and-sei","tag-materials-science"],"_links":{"self":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/31465","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/comments?post=31465"}],"version-history":[{"count":0,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/31465\/revisions"}],"wp:attachment":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/media?parent=31465"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/categories?post=31465"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/tags?post=31465"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}