Synergistically Tailoring the Electronic Structure and Ion Diffusion of Atomically Thin Co(OH)_2 Nanosheets Enable Fast Pseudocapacitive Sodium Ion Storage

Baoyu Sun; Wei Zheng; Shuaifeng LouBingxing XieCan CuiGuo-Xu ZhangFanpeng KongYulin MaChunyu DuPengjian ZuoJingying XieGeping Yin

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Synergistically Tailoring the Electronic Structure and Ion Diffusion of Atomically Thin Co(OH)_2 Nanosheets Enable Fast Pseudocapacitive Sodium Ion Storage

机译：Synergistically Tailoring the Electronic Structure and Ion Diffusion of Atomically Thin Co(OH)_2 Nanosheets Enable Fast Pseudocapacitive Sodium Ion Storage

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The fast-growing development for high-capacity anodes is undermined bytheir unsatisfactory rate performance and cycling stability stemming fromsluggish ion-migration speed, poor electronic conductivity, and mechanicaldegradation induced by the stress accumulation, which greatly hamperpractical applications of Na-ion batteries. Here, a combined experimental andtheoretical study on atomic-thickness (0.6 nm) Co(OH)_2 nanosheet with surfacedefects (2D-Co(OH)_2@D NSs) and large interplanar spacing (0.465 nm)is presented, in which fast ion/electron transport is permitted to boost batteryreactions. The mechanical degradation on cycling can be well buffered viatailoring mesopores across the Co(OH)_2 nanosheet and an elastic solid-electrolyte interface is established by modulating the electronic structure ofthe Co(OH)_2 surface. The 2D-Co(OH)_2@D NSs exhibit high rate-capacity(>228 mAh g~(?1) at 20 A g~(?1)) and superior cyclic stability with negligible decayduring 1300 cycles. This study will shed light on the development of electrodematerials at atomic-level design for high-power and long-lived performance.

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《Advanced functional materials》 |2023年第6期|2211711.1-2211711.11|共11页
作者
Baoyu Sun; Wei Zheng; Shuaifeng LouBingxing XieCan CuiGuo-Xu ZhangFanpeng KongYulin MaChunyu DuPengjian ZuoJingying XieGeping Yin;
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MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001, China;

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001, China,State Key Laboratory of Space Power-Sources Technology Shanghai Ins;

School of New Energy Nanjing University of Science and Technology Jiangyin 214443, China;

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2D nanosheets; defects; density functional theory calculations; pseudocapacitance; sodium ion batteries;

Synergistically Tailoring the Electronic Structure and Ion Diffusion of Atomically Thin Co(OH)_2 Nanosheets Enable Fast Pseudocapacitive Sodium Ion Storage

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