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Interphase Engineering Enabled All-Ceramic Lithium Battery
Fudong Han, Jie Yue, Cheng Chen, Ning Zhao, Xiulin Fan, Zhaohui Ma, Tao Gao, Fei Wang, Xiangxin Guo, Chunsheng Wang Joule Volume 2, Issue 3, Pages (March 2018) DOI: /j.joule Copyright © 2018 Elsevier Inc. Terms and Conditions
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Joule 2018 2, DOI: ( /j.joule ) Copyright © 2018 Elsevier Inc. Terms and Conditions
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Figure 1 Schematics of the Interphase-Engineered All-Ceramic Cathode/Electrolyte A thin layer of Li2CO3 (3 nm) was artificially coated on LCO because the spontaneously formed Li2CO3 on LCO is too thin. The Li2CO3-coated LCO was then mixed with a spontaneously Li2CO3-coated LLZO and Li2.3C0.7B0.3O3 solder to make a cathode composite. The cathode composite was then coated on an LLZO ceramic pellet, which was also spontaneously coated by Li2CO3. After sintering at 700°C, Li2.3C0.7B0.3O3 will melt, and react with the Li2CO3 coatings on both LLZO and LCO to form Li2.3−xC0.7+xB0.3−xO3 (LCBO) interphase. Joule 2018 2, DOI: ( /j.joule ) Copyright © 2018 Elsevier Inc. Terms and Conditions
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Figure 2 Characterization of Li2CO3 Coatings on LLZO and LCO
(A and B) SEM (A) and TEM (B) images of the (C) SEM image and elemental mappings of C and Zr (C) of the (D and E) SEM (D) and TEM (E) images of the as-synthesized LCO. (F and G) SEM (F) and TEM (G) images of the (H–J) XRD (H), Raman (I), and XPS (J) of the as-synthesized LCO, and respectively. The Raman spectrum of Li2CO3 was also included in (I). Joule 2018 2, DOI: ( /j.joule ) Copyright © 2018 Elsevier Inc. Terms and Conditions
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Figure 3 Characterization of the Interphase-Engineered All-Ceramic Cathode/Electrolyte (A) XRD of the composites of Li2.3C0.7B0.3O3 + (12:58 in weight), Li2.3C0.7B0.3O3 + (12:30 in weight), and Li2.3C0.7B0.3O3 + (12:30:58 in weight) after sintering at 700°C for 1 hr in air. These composites were ball-milled with the corresponding weight ratio and pressed into pellets before sintering. (B and C) SEM images of cross-section (B) and top surface (C) of the cathode composite (Li2.3C0.7B0.3O3 + coated on an LLZO pellet before sintering. (D and E) SEM images of cross-section (D) and top surface (E) of the cathode composite coated on an LLZO pellet after sintering at 700°C for 1 hr in air. (F–I) High-magnification cross-section SEM image (F) and elemental mappings of Zr (G), Co (H), and B (I) of the cathode composite after sintering at 700°C for 1 hr in air. Joule 2018 2, DOI: ( /j.joule ) Copyright © 2018 Elsevier Inc. Terms and Conditions
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Figure 4 Electrochemical Performance of All-Ceramic Li/LLZO/LCO Cells
(A) Charge/discharge profiles of the interphase-engineered all-ceramic Li/LLZO/LCO cell for the first three cycles at 0.05 C at 100°C. (B) Charge/discharge profiles of the interphase-engineered all-ceramic Li/LLZO/LCO cell at different rates from 0.05 C to 1 C at 100°C. Note that the profiles at five different C rates were obtained from five fresh cells after one activation cycle at 0.05 C. (C) Rate performance of the interphase-engineered all-ceramic Li/LLZO/LCO cell at 100°C. Note that the capacities at five different C rates were obtained from five fresh cells with each cell represented by one color. (D) Cycling performance of the interphase-engineered all-ceramic Li/LLZO/LCO cell at 0.05 C at 100°C. The cycling performances of all-ceramic Li/LLZO/LCO cells with the cathode composites consisting of uncoated LCO (LCO + Li2.3C0.7B0.3O3 + and uncoated LLZO Li2.3C0.7B0.3O3 + LLZO) were also included. (E) Charge/discharge profiles of the interphase-engineered all-ceramic Li/LLZO/LCO cell for the first three cycles at 0.05 C at 25°C. (F) Cycling performance of the interphase-engineered all-ceramic Li/LLZO/LCO cell at 0.05 C at 25°C. The specific capacity was calculated based on the weight of LCO in the cathode composite. Joule 2018 2, DOI: ( /j.joule ) Copyright © 2018 Elsevier Inc. Terms and Conditions
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