{"id":184726,"date":"2019-08-31T06:30:26","date_gmt":"2019-08-30T22:30:26","guid":{"rendered":"http:\/\/www.cailiaoniu.com\/?p=184726"},"modified":"2019-08-30T14:26:06","modified_gmt":"2019-08-30T06:26:06","slug":"%e3%80%90%e6%8a%95%e7%a8%bf%e3%80%91%e8%a5%bf%e5%8d%97%e7%9f%b3%e6%b2%b9%e5%be%b7%e5%b7%9e%e5%a4%a7%e5%ad%a6%e5%a5%a5%e6%96%af%e4%b8%81%e5%88%86%e6%a0%a1%e5%ae%81%e5%be%b7%e6%97%b6%e4%bb%a3j-mater-c","status":"publish","type":"post","link":"http:\/\/www.cailiaoniu.com\/?p=184726","title":{"rendered":"\u897f\u5357\u77f3\u6cb9&\u5fb7\u5dde\u5927\u5b66\u5965\u65af\u4e01\u5206\u6821&\u5b81\u5fb7\u65f6\u4ee3J Mater Chem A\uff1aSrF2\u5fae\u7403\u5355\u9762\u6d82\u8986\u9694\u819c\u6291\u5236\u9502\u679d\u6676\u751f\u957f"},"content":{"rendered":"

1\u3001\u5f15\u8a00<\/b><\/strong><\/p>\n

\u9502\u91d1\u5c5e\u662f\u7406\u60f3\u7684\u8d1f\u6781\u6750\u6599\uff0c\u7136\u800c\uff0c\u9502\u91d1\u5c5e\u4f5c\u4e3a\u8d1f\u6781\u4f7f\u7528\u65f6\uff0c\u5728\u53cd\u590d\u5145\u653e\u7535\u8fc7\u7a0b\u4e2d\u5bb9\u6613\u51fa\u73b0\u7c89\u5316\u3001\u679d\u6676\u751f\u957f\u3001\u6b7b\u9502\u7b49\u95ee\u9898\uff0c\u5bfc\u81f4\u5bf9\u5e94\u4e8c\u6b21\u7535\u6c60\u7684\u5faa\u73af\u6027\u80fd\u5dee\u3001\u5bb9\u91cf\u8870\u51cf\u8fc5\u901f\u3001\u5e93\u4ed1\u6548\u7387\u4f4e\u3001\u6781\u5316\u4e25\u91cd\uff1b\u66f4\u4e3a\u4e25\u91cd\u7684\u662f\uff0c\u9502\u679d\u6676\u751f\u957f\u8fd8\u4f1a\u523a\u7a7f\u9694\u819c\u5bfc\u81f4\u7535\u6c60\u77ed\u8def\u5e76\u53ef\u80fd\u5f15\u53d1\u4e25\u91cd\u7684\u5b89\u5168\u95ee\u9898\u3002<\/p>\n

\u7814\u7a76\u8868\u660e\uff0c\u901a\u8fc7\u5728\u9694\u819c\u7684\u5355\u9762\u6216\u8005\u53cc\u9762\u6d82\u8986\u9676\u74f7\u5c42\uff0c\u5982\u6c27\u5316\u94dd\uff08Al2<\/sub>O3<\/sub>\uff09\u7b49\uff0c\u5bf9\u63d0\u5347\u7535\u6c60\u7684\u5b89\u5168\u6027\u6709\u663e\u8457\u7684\u5e2e\u52a9\u3002\u4e8b\u5b9e\u4e0a\uff0c\u4ee5\u4e0a\u5df2\u88ab\u6210\u529f\u5e94\u7528\u4e8e\u4ee5\u77f3\u58a8\u4e3a\u8d1f\u6781\u7684\u5546\u54c1\u5316\u9502\u79bb\u5b50\u7535\u6c60\u3002\u90a3\u4e48\uff0c\u9694\u819c\u6d82\u8986\u9676\u74f7\u5c42\uff0c\u5bf9\u4e8e\u4ee5\u9502\u91d1\u5c5e\u4e3a\u8d1f\u6781\u7684\u7535\u6c60\u4f1a\u6709\u600e\u6837\u7684\u5f71\u54cd\u5462\uff1f<\/b><\/strong><\/p>\n

2\u3001\u6210\u679c\u4ecb\u7ecd<\/b><\/strong><\/p>\n

\u8fd1\u65e5\uff0c\u897f\u5357\u77f3\u6cb9\u5927\u5b66\u674e\u661f<\/b><\/strong>\u6559\u6388\u56e2\u961f<\/b><\/strong>\u4e0e<\/b><\/strong>University of Texas at Austin<\/i><\/b><\/em><\/strong>\u7684<\/b><\/strong>David<\/b><\/strong>\u00a0<\/b><\/strong>Mitlin\u6559\u6388\u53ca<\/b><\/strong>\u5b81\u5fb7\u65f6\u4ee3\u65b0\u80fd\u6e90\u79d1\u6280\u6709\u9650\u516c\u53f8(CATL)<\/b><\/strong>\u7684<\/b><\/strong>\u90d1\u5efa\u660e\u535a\u58eb\u7b49<\/b><\/strong>\u5f00\u5c55\u4e86\u6c1f\u5316\u7269\u6d82\u8986\u9694\u819c\u5bf9\u6291\u5236\u9502\u679d\u6676\u751f\u957f\u7684\u7814\u7a76\u3002<\/p>\n

\u91cd\u70b9\u8003\u5bdf\u4e86SrF2<\/sub>\u5fae\u7403\u5355\u9762\u6d82\u8986PP\u9694\u819c\uff08\u7535\u6c60\u5de5\u4f5c\u65f6\uff0c\u88abSrF2<\/sub>\u6d82\u8986\u7684\u9694\u819c\u9762\u671d\u5411\u9502\u91d1\u5c5e\uff09\u5728\u9502\u91d1\u5c5e\u7535\u6c60\u5de5\u4f5c\u65f6\u6240\u53d1\u6325\u7684\u4f5c\u7528\u3002SrF2<\/sub>\u88ab\u9009\u62e9\u4f5c\u4e3a\u8003\u5bdf\u5bf9\u8c61\u7684\u539f\u56e0\u662f\u5176\u70ed\u7a33\u5b9a\u6027\u53ca\u7535\u5316\u5b66\u7a33\u5b9a\u6027\u5747\u8f83\u597d\u3002\u5f53\u7136\uff0c\u672c\u5de5\u4f5c\u6240\u5f97\u51fa\u7684\u7ed3\u8bba\u53ef\u80fd\u4e0d\u9650\u4e8e\u5355\u4e00\u7684SrF2<\/sub>\uff0c\u4e5f\u53ef\u80fd\u9002\u7528\u4e8e\u5176\u5b83\u7684\u6c1f\u5316\u7269\u3002<\/p>\n

\u7ed3\u679c\u53d1\u73b0\uff0c\uff081\uff09<\/b><\/strong>SrF2<\/sub>\u5fae\u7403\u6d82\u5c42\u5728\u9502\u91d1\u5c5e\u7535\u6c60\u5de5\u4f5c\u8fc7\u7a0b\u4e2d\u4f1a\u90e8\u5206\u7684\u4ecePP\u9694\u819c\u8868\u9762\u8131\u843d\uff0c\u539f\u4f4d\u7684\u53c2\u4e0e\u9502\u91d1\u5c5e\u8868\u9762SEI\u819c\u7684\u5f62\u6210\uff0c\u4ece\u800c\u6709\u52a9\u4e8e\u589e\u5f3aSEI\u819c\u7684\u673a\u68b0\u5f3a\u5ea6\uff1b\uff082\uff09<\/b><\/strong>XPS\u7ed3\u679c\u53caDFT\u8ba1\u7b97\u5747\u8868\u660e\uff0cLi+<\/sup>\u503e\u5411\u4e8e\u5728\u9576\u5d4c\u5728SEI\u819c\u4e2d\u7684SrF2<\/sub>\u5fae\u7403\u8868\u9762\u5438\u9644\uff0c\u5176\u6709\u53ef\u80fd\u5728\u8868\u9762\u5f62\u6210\u5747\u4e00\u7684\u79bb\u5b50\u6d41\u5c42\uff0c\u5bf9\u524a\u5f31\u79bb\u5b50\u6216\u7535\u5b50\u7684\u5c40\u90e8\u5806\u79ef\u53ca\u6291\u5236\u9502\u679d\u6676\u751f\u957f\u5747\u53d1\u6325\u4e86\u91cd\u8981\u7684\u4f5c\u7528\u3002<\/p>\n

3\u3001\u56fe\u6587\u5bfc\u8bfb<\/b><\/strong><\/p>\n

\u4e0b\u56fe\u662f\u91c7\u7528\u6c34\u70ed\u6cd5\u5236\u5907\u7684SrF2<\/sub>\u5fae\u7403\u53ca\u5355\u5c42\u6d82\u8986SrF2<\/sub>\u5fae\u7403\u7684PP\u819c\uff08\u5305\u542bPristine\u00a0PP\u819c\uff09\u3002<\/p>\n

\"\"<\/p>\n

Figure 1.<\/b><\/strong>\u00a0(a),<\/b><\/strong>\u00a0(b)<\/b><\/strong>\u00a0SEM images of the as-synthesized SrF2<\/sub>\u00a0microspheres, taken at different magnifications (scale bars on bottom right).<\/p>\n

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Figure 2.<\/b><\/strong>\u00a0SEM images for (a)<\/b><\/strong>\u00a0the pristine PP separator and (b)<\/b><\/strong>\u00a0the SrF2<\/sub>\u00a0microspheres coated PP separator.<\/p>\n

\u7136\u540e\uff0c\u5206\u522b\u91c7\u7528pristine\u00a0PP\u9694\u819c\u548cSrF2<\/sub>\u6d82\u8986\u7684PP\u9694\u819c\u7ec4\u88c5\u4e86Li||Li\u5bf9\u79f0\u578b\u7535\u6c60\u548cLi||Cu\u7535\u6c60\uff0c\u8fdb\u884c\u4e86\u7535\u5316\u5b66\u6027\u80fd\u8003\u5bdf\u6bd4\u8f83\u3002\u901a\u8fc7\u5bf9\u6bd4\u53ef\u4ee5\u660e\u663e\u53d1\u73b0\uff0cSrF2<\/sub>\u6d82\u8986\u7684PP\u9694\u819c\u7ec4\u88c5\u7684Li||Li\u5bf9\u79f0\u578b\u7535\u6c60\u7684\u6781\u5316\u6bd4pristine\u00a0PP\u9694\u819c\u8981\u5c0f\u5f88\u591a\uff0c\u6b64\u5916\uff0c\u5bf9\u5e94Li||Cu\u7535\u6c60\u7684\u5faa\u73af\u6027\u80fd\u4e5f\u6bd4\u540e\u8005\u597d\u5f88\u591a\u3002<\/p>\n

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Figure 3 <\/b><\/strong>Comparison of the\u00a0<\/b><\/strong>baseline pristine (unmodified) PP and the SrF2<\/sub>\u00a0coated PP separators in half-cell and symmetrical cell configurations. (a) <\/b><\/strong>A comparison of the cycling Coulombic efficiency (CE) of Li||Cu cells, tested at 0.25 mA cm-2<\/sup>\u00a0between 0 \u2013 1 V vs. Li\/Li+<\/sup>\u00a0to a capacity of 0.5 mAh cm-2<\/sup>. (b)<\/b><\/strong>\u00a0Cycling performances of\u00a0Li||Li cells, tested at a current density of 0.25 mA cm-2<\/sup>\u00a0to a capacity of 0.5 mAh cm-2<\/sup>. (c), (d)<\/b><\/strong>\u00a0Voltage vs. <\/i><\/em>time curves for the Li||Cu cells, with insets showing selected enlarged examples of the curves. (e), (f)<\/b><\/strong>\u00a0Comparison of voltage vs. <\/i><\/em>time curves for the Li||Cu cells at cycle 1. \u00a0<\/p>\n

\u968f\u540e\uff0c\u6211\u4eec\u53c8\u7ec4\u88c5\u4e86\u9502\u91d1\u5c5e\u5168\u7535\u6c60\uff08Li||NCM\uff09\u5bf9\u6bd4\u8003\u5bdf\u5176\u7535\u5316\u5b66\u6027\u80fd\uff0c\u7ed3\u679c\u53d1\u73b0\uff0cSrF2<\/sub>\u6d82\u8986\u7684PP\u9694\u819c\u5bf9\u5e94\u7684\u9502\u91d1\u5c5e\u5168\u7535\u6c60\u5c55\u73b0\u51fa\u66f4\u52a0\u4f18\u5f02\u7684\u5faa\u73af\u7a33\u5b9a\u6027\u548c\u500d\u7387\u6027\u80fd\u3002<\/p>\n

\"\"<\/b><\/strong><\/p>\n

\u00a0<\/b><\/strong>Figure 4 <\/b><\/strong>Galvanostatic performance of Li||NCM cells with and without the SrF2 separator coating. (a) <\/b><\/strong>Cycling capacity retention and CE comparison, with testing being performed between 2.7 and 4.3 V at C\/3 (1C = 200 mA g-1), after the three formation cycles at C\/10. (b) and (c)<\/b><\/strong> Corresponding galvanostatic charge-discharge profiles. (d) <\/b><\/strong>Rate capability comparison at C\/10 to 20C. (e) and (f) <\/b><\/strong>Corresponding galvanostatic data.\u00a0<\/p>\n

\u9502\u91d1\u5c5e\u8d1f\u6781\u4e0d\u540c\u9636\u6bb5\u7684SEM\u56fe\u8868\u660e\uff0cSrF2<\/sub>\u5fae\u7403\u7684\u786e\u539f\u4f4d\u7684\u53c2\u4e0e\u4e86\u9502\u91d1\u5c5e\u8868\u9762SEI\u819c\u7684\u5f62\u6210\u3002<\/p>\n

\"\"<\/b><\/strong><\/p>\n

Figure 5 <\/b><\/strong>SEM images of the surface morphologies of the post-cycled Li metal anodes tested in a full cell Li||NMC configuration, comparing pristine vs. SrF2<\/sub>\u00a0modified separators. (a) <\/b><\/strong>–\u00a0(e) <\/b><\/strong>pristine vs.<\/i><\/em>\u00a0(f) <\/b><\/strong>–\u00a0(j)<\/b><\/strong>\u00a0SrF2<\/sub>\u00a0modified, plated at 20 mA g-1<\/sup>\u00a0for 1h, 2h, 4h, 8h and 10h, corresponding to total capacity of 20, 40, 80, 160 and 200 mAh g-1<\/sup>, respectively. (k) <\/b><\/strong>–\u00a0(o)<\/b><\/strong>\u00a0Pristine vs. (p) <\/b><\/strong>– (t) <\/b><\/strong>SrF2<\/sub>\u00a0modified, tested for 20, 40, 80, 160 and 200 cycles at 200 mA g-1<\/sup>\u00a0for 2 hrs. per cycle.<\/p>\n

XPS\u7ed3\u679c\u53caDFT\u8ba1\u7b97\u5747\u8868\u660e\uff0cLi+<\/sup>\u503e\u5411\u4e8e\u5728\u9576\u5d4c\u5728SEI\u819c\u4e2d\u7684SrF2<\/sub>\u5fae\u7403\u8868\u9762\u5438\u9644\uff0c\u5176\u6709\u53ef\u80fd\u5728\u8868\u9762\u5f62\u6210\u5747\u4e00\u7684\u79bb\u5b50\u6d41\u5c42\uff0c\u5bf9\u524a\u5f31\u79bb\u5b50\u6216\u7535\u5b50\u7684\u5c40\u90e8\u5806\u79ef\u53ca\u6291\u5236\u9502\u679d\u6676\u751f\u957f\u5747\u53d1\u6325\u4e86\u91cd\u8981\u7684\u4f5c\u7528\u3002\u5224\u65adLi<\/b><\/strong>+<\/b><\/sup><\/strong>\u503e\u5411\u4e8e\u5728\u9576\u5d4c\u5728SEI\u819c\u4e2d\u7684<\/b><\/strong>SrF<\/b><\/strong>2<\/b><\/sub><\/strong>\u5fae\u7403\u8868\u9762\u5438\u9644<\/b><\/strong>\u7684\u4f9d\u636e\u662f\uff1apristine<\/b><\/strong>\u00a0<\/b><\/strong>SrF<\/b><\/strong>2<\/b><\/sub><\/strong>\u5fae\u7403\u53ea\u4f1a\u5728\u8f83\u4f4eBinding<\/b><\/strong>\u00a0<\/b><\/strong>Energy\u5904\u51fa\u73b0\u4e24\u4e2aXPS\u5cf0\uff08Sr<\/b><\/strong>\u00a03<\/b><\/strong>d<\/b><\/strong>3<\/b><\/sub><\/strong>\/<\/b><\/sub><\/strong>2<\/b><\/sub><\/strong>\u548cSr<\/b><\/strong>\u00a03<\/b><\/strong>d<\/b><\/strong>5<\/b><\/sub><\/strong>\/<\/b><\/sub><\/strong>2<\/b><\/sub><\/strong>\uff09\uff0c\u4f46\u662f\u4ece\u4e0b\u56fe\u4e2d\u53ef\u4ee5\u89c2\u5bdf\u5230\uff0c\u53c2\u4e0eSEI\u819c\u5f62\u6210\u7684SrF<\/b><\/strong>2<\/b><\/sub><\/strong>\u5747\u4f1a\u5728\u66f4\u9ad8\u7684Binding<\/b><\/strong>\u00a0Energy<\/b><\/strong>\u5904\u5bf9\u79f0\u7684\u51fa\u73b0\u4e24\u4e2aXPS\u5cf0\uff08Sr<\/b><\/strong>\u00a03d<\/b><\/strong>3<\/b><\/sub><\/strong>\/<\/b><\/sub><\/strong>2<\/b><\/sub><\/strong>\u548c<\/b><\/strong>Sr<\/b><\/strong>\u00a03d<\/b><\/strong>5<\/b><\/sub><\/strong>\/<\/b><\/sub><\/strong>2<\/b><\/sub><\/strong>\uff09\u3002\u5373\uff0cBinding<\/b><\/strong>\u00a0<\/b><\/strong>Energy\u51fa\u73b0\u84dd\u79fb\uff0c\u5176\u5fc5\u7136\u662fLi<\/b><\/strong>+<\/b><\/sup><\/strong>\u4e0e\u5176\u76f8\u4e92\u4f5c\u7528\u7684\u7ed3\u679c\u3002\u4f46\u662f\uff0cLi<\/b><\/strong>+<\/b><\/sup><\/strong>\u4e0e\u5176\u76f8\u4e92\u4f5c\u7528\u662f\u5426\u751f\u6210\u4e86\u65b0\u7684\u7269\u8d28\uff0c\u6211\u4eec\u76ee\u524d\u6ca1\u6709\u5b9a\u8bba\u3002<\/b><\/strong><\/p>\n

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Figure 6.<\/b><\/strong>\u00a0(a)<\/b><\/strong>\u00a0– (i) <\/b><\/strong>and\u00a0(a\u2019) <\/b><\/strong>–\u00a0(i\u2019) <\/b><\/strong>High \u2013 resolution XPS spectra for post-cycled Li metal anodes with pristine vs. SrF2<\/sub>\u00a0modified\u00a0separator. (a) <\/b><\/strong>–\u00a0(i)<\/b><\/strong>\u00a0Testing conditions are the same as in Fig. 3<\/b><\/strong>, 20 mA g-1<\/sup>\u00a0for 1h, 4h, 10h. (a\u2019)<\/b><\/strong>\u00a0\u2013 (i\u2019)<\/b><\/strong>\u00a0Tested for 20, 80, and 200 cycles at 200 mA g-1<\/sup>\u00a0for 2 hrs. The survey spectra and the high-resolution XPS data 2 hr. and 4 hrs., 40 cycles and 160 samples are shown in\u00a0Figs. S10 \u2013 S14<\/b><\/strong>.\u00a0\u00a0(a, a\u2019) <\/b><\/strong>\u2013\u00a0(c, c\u2019) <\/b><\/strong>and\u00a0(d, d\u2019) <\/b><\/strong>\u2013 (f, f\u2019) <\/b><\/strong>F1s spectra for baseline and SrF2<\/sub>\u00a0coated, (g, g\u2019)<\/b><\/strong>\u00a0\u2013 (i, i’)<\/b><\/strong>\u00a0Sr3d spectra for SrF2<\/sub>\u00a0coated.<\/p>\n

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Figure 7.<\/strong> Calculated band structure and partial density of states for (a)<\/strong> SrF2 (110) plane, (d)<\/strong> Sr-top site, (e)<\/strong> F-top site and (f)<\/strong> Sr-F-bridge site, respectively; (b)<\/strong> Surface energies of low index facets for SrF2 (110) plane, and (c)<\/strong> stable lithium ion adsorption site on SrF2 (110) plane.<\/p>\n

\u6574\u4e2a\u8fc7\u7a0b\u7684\u793a\u610f\u56fe\u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n

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4\u3001\u5c0f\u7ed3<\/b><\/strong><\/p>\n

\u4e0a\u8ff0\u7814\u7a76\u7ed3\u679c\u8868\u660e\uff0cSrF2<\/sub>\u6d82\u8986\u5c42\u4e0d\u4ec5\u80fd\u591f\u6709\u6548\u6291\u5236\u9502\u679d\u6676\u751f\u957f\uff0c\u800c\u4e14\u8fd8\u80fd\u591f\u539f\u4f4d\u7684\u53c2\u4e0e\u9502\u91d1\u5c5e\u8868\u9762SEI\u7684\u5f62\u6210\uff0c\u4ece\u800c\u5728\u9502\u91d1\u5c5e\u8868\u9762\u5f62\u6210\u4e00\u5c42\u9502\u679d\u6676Free\u548cRobust\u7684\u4fdd\u62a4\u5c42\u3002\u672c\u6587\u4ee5\u201cFunctional SrF<\/b><\/strong>2<\/b><\/sub><\/strong>\u00a0Coated Separator Enabling Robust and Dendrite-Free Solid Electrolyte Interphase on Lithium Metal Anode<\/b><\/strong>\u201d\u4e3a\u9898\uff0c\u5728\u7ebf\u53d1\u8868\u5728Journal of Materials Chemistry A<\/b><\/strong>\uff08<\/b><\/strong>DOI: 10.1039\/C9TA06908A<\/b><\/strong>\uff09<\/b><\/strong>\u3002\u672c\u6587\u7684\u5b9e\u9a8c\u5de5\u4f5c\u4e3b\u8981\u7531\u7855\u58eb\u7814\u7a76\u751f\u5218\u6768\u5f00\u5c55\u3002\u4e0a\u8ff0\u5de5\u4f5c\u5df2\u7533\u8bf7\u7f8e\u56fd\u53d1\u660e\u4e13\u5229\u3002<\/p>\n

\u672c\u6587\u7531\u897f\u5357\u77f3\u6cb9\u5927\u5b66\u674e\u661f\u6559\u6388\u56e2\u961f<\/strong>\u4f9b\u7a3f\u3002<\/p>\n

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