Building a Stable Plateau-Type Na2Ti3O7 Anode Interface toward Advanced Sodium-Ion Batteries - Details

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Layered　structure　Na2Ti3O7　with　a　suitable　sodiation　plateau　potential　(∼0.3　V　vs　Na+/Na)　is　a　promising　anode　for　highly　safe　sodium-ion　batteries　(SIBs).　However,　the　practical　use　of　Na2Ti3O7　is　hindered　by　the　unstable　interface　that　forms　between　the　anode　and　electrolyte　leading　to　issues　such　as　low　initial　coulombic　efficiency　(ICE)　and　cycling　instability.　Herein,　we　introduce　tetraethyl　orthosilicate　(TEOS)　as　an　electrolyte　additive　that　can　spontaneously　and　effectively　react　with　the　main　component　of　the　detrimental　surface　corrosion　layer　(sodium　hydroxide,　etc.)　to　form　a　protective　film　on　the　Na2Ti3O7　anode.　The　Na2Ti3O7　anode　exhibits　an　enhanced　capacity　from　134.8　to　167.1　mAh　g-1　at　0.1　A　g-1,　along　with　an　increase　in　capacity　retention　from　56.1　to　83.9%　after　250　cycles　at　0.2　A　g-1.　This　work　provides　a　straightforward　protection　strategy　to　address　the　unstable　interface　issues,　rendering　sodium　titanate　as　a　promising　anode　material　to　achieve　practical　application　in　the　future.　©　2024　American　Chemical　Society

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[ 1 ] [Jiang Z.]College of Chemical Engineering, Fuzhou University, Fuzhou, 350116, China
[ 2 ] [Ke H.]College of Chemical Engineering, Fuzhou University, Fuzhou, 350116, China
[ 3 ] [Zhang Y.]College of Chemical Engineering, Fuzhou University, Fuzhou, 350116, China
[ 4 ] [Li L.]College of Chemical Engineering, Fuzhou University, Fuzhou, 350116, China
[ 5 ] [Wang F.]College of Chemical Engineering, Fuzhou University, Fuzhou, 350116, China
[ 6 ] [Li J.]College of Chemical Engineering, Fuzhou University, Fuzhou, 350116, China
[ 7 ] [Huang J.]College of Chemical Engineering, Fuzhou University, Fuzhou, 350116, China
[ 8 ] [Zhang Y.]College of Chemical Engineering, Fuzhou University, Fuzhou, 350116, China
[ 9 ] [Jiang Y.]School of Materials Science and Engineering, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China
[ 10 ] [Chen B.]Institute of Applied Physics and Materials Engineering, University of Macau, 999078, Macao
[ 11 ] [Tang Y.]College of Chemical Engineering, Fuzhou University, Fuzhou, 350116, China
[ 12 ] [Tang Y.]Qingyuan Innovation Laboratory, Quanzhou, 362801, China

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Energy and Fuels

ISSN： 0887-0624

Year： 2024

Issue： 3

Volume： 38

Page： 2472-2479

5 . 2 0 0

JCR@2023

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