Correction to Conversion Reaction of Nanoporous ZnO for Stable Electrochemical Cycling of Binderless Si Microparticle Composite Anode Donghyuk Kim, Minkyu Park, Sang-Min Kim, Hyung Cheoul Shim, Seungmin Hyun, and Seung Min Han* ACS Nano Downloaded from pubs.acs.org by 5.189.200.189 on 01/07/19. For personal use only.
ACS Nano 2018, 12 (11), 10903−10913. DOI: 10.1021/acsnano.8b03951 efficiencies for the first, second, and 200th cycles were added, as shown. We emphasize that this change in the CE plot does not affect any of the original discussions in this paper that highlight the role of the Li2O and Zn matrix formed from the ZnO conversion reaction in enhancing the capacity retention and CE of the nanoporous ZnO/SiMP composite anode. The enhanced capacity retention and high CE is the result of the ionically and electrically conductive Li2O/Zn matrix that surrounds and keeps the SiMPs coalesced throughout extended lithiation/delithiation cycles, while also facilitating stable SEI growth.
D
ue to an error in the Coulombic efficiency (CE) calculation, where CE = (Qcharge/Qdischarge) × 100 was calculated instead with Qdischarge/Qcharge in the original article, resulting in CE values exceeding 100%. This requires corrections in the Coulombic efficiency portion in Figure 3a as well as the following paragraph.
Figure 3a. Capacity retention and Coulombic efficiency of an npZnO SiMP electrode at C/5 rate with a potential window of 0.01− 1 V (versus Li0/Li+). The first 10 cycles were performed at C/20 rate for activation and a further 200 cycles at C/5 rate.
“First-cycle CE was observed to be 117% due to the initial conversion reaction of np-ZnO (Figure 3a), which agrees well with Hu et al.53 and Jang et al.,54 where the CEs of conversion reaction metal oxides were investigated and reported that a complex reaction mechanism causes the high Coulombic efficiency. After the first cycle, CE remained above 100% throughout extended cycling, suggesting active participation of ZnO in the electrochemical reaction, which highlights the multifunctioning capability of the developed binderless electrode design.” This should instead read as follows: “First-cycle CE was observed to be 91.8% that increased to above 99% after the second cycle and was retained for the subsequent 200 cycles. The high initial CE can be attributed to the np-ZnO facilitating stable SEI growth via the formation of the ionically and electrically conductive Li2O/Zn matrix that prevents SiMPs from coming into direct electrolyte contact, which agrees well with Zhu et al.49 After the first cycle, CE remained above 99% throughout extended cycling, which highlights the multifunctioning capability of the developed binderless np-ZnO/SiMP electrode design.” Figure 3a was corrected accordingly, and a table for the first lithiation and delithiation specific capacity and Coulombic © XXXX American Chemical Society
Received: November 25, 2018
A
DOI: 10.1021/acsnano.8b08958 ACS Nano XXXX, XXX, XXX−XXX
Additions and Corrections
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Cite This: ACS Nano XXXX, XXX, XXX−XXX
ACS Nano
Additions and Corrections
Table 1. First Cycle Lithiation and Delithiation Specific Capacities and First Cycle and Coulombic Efficiencies of First, Second, and 200th Cycles first lithiation (mAh/g)
first delithiation (mAh/g)
first Coulombic efficiency (%)
second Coulombic efficiency (%)
200th Coulombic efficiency (%)
3580 (C/20 rate)
3902 (C/20 rate)
99.2 (C/20 rate)
99.7 (C/20 rate)
99.8 (C/5 rate)
B
DOI: 10.1021/acsnano.8b08958 ACS Nano XXXX, XXX, XXX−XXX
