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Tzeng Y, Jhan CY, Chen GY, Chiu KM, Wu YC, Wang PS. Hydrogen Bond-Enabled High-ICE Anode for Lithium-Ion Battery Using Carbonized Citric Acid-Coated Silicon Flake in PAA Binder. ACS OMEGA 2023; 8:8001-8010. [PMID: 36872967 PMCID: PMC9979319 DOI: 10.1021/acsomega.2c07830] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 02/06/2023] [Indexed: 06/18/2023]
Abstract
A silicon-based lithium-ion battery (LIB) anode is extensively studied because of silicon's abundance, high theoretical specific capacity (4200 mAh/g), and low operating potential versus lithium. Technical barriers to large-scale commercial applications include the low electrical conductivity and up to about 400% volume changes of silicon due to alloying with lithium. Maintaining the physical integrity of individual silicon particles and the anode structure is the top priority. We use strong hydrogen bonds between citric acid (CA) and silicon to firmly coat CA on silicon. Carbonized CA (CCA) enhances electrical conductivity of silicon. Polyacrylic acid (PAA) binder encapsulates silicon flakes by strong bonds formed by abundant COOH functional groups in PAA and on CCA. It results in excellent physical integrity of individual silicon particles and the whole anode. The silicon-based anode shows high initial coulombic efficiency, around 90%, and the capacity retention of 1479 mAh/g after 200 discharge-charge cycles at 1 A/g current. At 4 A/g, the capacity retention of 1053 mAh/g was achieved. A durable high-ICE silicon-based LIB anode capable of high discharge-charge current has been reported.
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Xu L, Chu Z, Zhang J, Cai T, Zhang X, Li Y, Wang H, Shen X, Cai R, Shi H, Zhu C, Pan J, Pan D. Steric Effects in the Deposition Mode and Drug-Delivering Efficiency of Nanocapsule-Based Multilayer Films. ACS OMEGA 2022; 7:30321-30332. [PMID: 36061696 PMCID: PMC9434745 DOI: 10.1021/acsomega.2c03591] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 08/03/2022] [Indexed: 05/10/2023]
Abstract
Using surface-initiated atom transfer radical polymerization (ATRP), block polymers with a series of quaternization degrees were coated on the surface of silica nanocapsules (SNCs) by the "grafting-from" technique. Molnupiravir, an antiviral medicine urgently approved for the treatment of SARS-CoV-2, was encapsulated in polymer-coated SNCs and further incorporated into well-defined films with polystyrene sulfonate (PSS) homopolymers by layer-by-layer (LBL) self-assembly via electrostatic interactions. We investigated the impact of the quaternization degree of the polymers and steric hindrance of functional groups on the growth mode, swelling/deswelling transition, and drug-delivering efficiency of the obtained LBL films. The SNCs were derived from coronas of parent block polymers of matched molecular weights-poly(N-isopropylacrylamide)-block-poly(N,N-dimethylaminoethyl methacrylate) (PNIPAM-b-PDMAEMA)-by quaternization with methyl sulfate. As revealed by the data results, SNCs with coronas with higher quaternization degrees resulted in a larger layering distance of the film structure because of weaker ionic pairing (due to the presence of a bulky methyl spacer) between SNCs and PSS. Interestingly, when comparing the drug release profile of the encapsulated drugs from SNC-based films, the release rate was slower in the case of capsule coronas with higher quaternization degrees because of the larger diffusion distance of the encapsulated drugs and stronger hydrophobic-hydrophobic interactions between SNCs and drug molecules.
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Affiliation(s)
- Li Xu
- Institute
of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Zihan Chu
- Institute
of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Jianhua Zhang
- N.O.D
Topia (GuangZhou) Biotechnology Co., Ltd., Guangzhou, Guangdong 510599, China
| | - Tingwei Cai
- Guangdong
Jiabo Pharmaceutical Co., Qingyuan, Guangdong 511517, China
| | - Xingxing Zhang
- Institute
of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Yinzhao Li
- Institute
of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Hailong Wang
- Institute
of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Xiaochen Shen
- China
Tobacco Jiangsu Industrial Co., Ltd., Nanjing, Jiangsu 210023, China
| | - Raymond Cai
- Institute
of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Haifeng Shi
- Institute
of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Chunyin Zhu
- Institute
of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Jia Pan
- Novo
Nordisk Research Center—Indianapolis, Inc., Indianapolis, Indiana 46241, United States
| | - Donghui Pan
- Jiangsu
Institute of Nuclear Medicine, Wuxi, Jiangsu 214063, China
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Cong R, Park HH, Jo M, Lee H, Lee CS. Synthesis and Electrochemical Performance of Electrostatic Self-Assembled Nano-Silicon@N-Doped Reduced Graphene Oxide/Carbon Nanofibers Composite as Anode Material for Lithium-Ion Batteries. Molecules 2021; 26:molecules26164831. [PMID: 34443418 PMCID: PMC8398711 DOI: 10.3390/molecules26164831] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 07/28/2021] [Accepted: 07/29/2021] [Indexed: 12/02/2022] Open
Abstract
Silicon-carbon nanocomposite materials are widely adopted in the anode of lithium-ion batteries (LIB). However, the lithium ion (Li+) transportation is hampered due to the significant accumulation of silicon nanoparticles (Si) and the change in their volume, which leads to decreased battery performance. In an attempt to optimize the electrode structure, we report on a self-assembly synthesis of silicon nanoparticles@nitrogen-doped reduced graphene oxide/carbon nanofiber (Si@N-doped rGO/CNF) composites as potential high-performance anodes for LIB through electrostatic attraction. A large number of vacancies or defects on the graphite plane are generated by N atoms, thus providing transmission channels for Li+ and improving the conductivity of the electrode. CNF can maintain the stability of the electrode structure and prevent Si from falling off the electrode. The three-dimensional composite structure of Si, N-doped rGO, and CNF can effectively buffer the volume changes of Si, form a stable solid electrolyte interface (SEI), and shorten the transmission distance of Li+ and the electrons, while also providing high conductivity and mechanical stability to the electrode. The Si@N-doped rGO/CNF electrode outperforms the Si@N-doped rGO and Si/rGO/CNF electrodes in cycle performance and rate capability, with a reversible specific capacity reaching 1276.8 mAh/g after 100 cycles and a Coulomb efficiency of 99%.
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Affiliation(s)
- Ruye Cong
- Department of Chemistry, Keimyung University, Daegu 42601, Korea; (R.C.); (H.-H.P.)
| | - Hyun-Ho Park
- Department of Chemistry, Keimyung University, Daegu 42601, Korea; (R.C.); (H.-H.P.)
| | - Minsang Jo
- Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea; (M.J.); (H.L.)
| | - Hochun Lee
- Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea; (M.J.); (H.L.)
| | - Chang-Seop Lee
- Department of Chemistry, Keimyung University, Daegu 42601, Korea; (R.C.); (H.-H.P.)
- Correspondence: ; Tel.: +82-53-580-5192
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Synthesis of Hollow Sphere and 1D Structural Materials by Sol-Gel Process. MATERIALS 2017; 10:ma10090995. [PMID: 28841188 PMCID: PMC5615650 DOI: 10.3390/ma10090995] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 08/17/2017] [Accepted: 08/21/2017] [Indexed: 12/05/2022]
Abstract
The sol-gel method is a simple and facile wet chemical process for fabricating advanced materials with high homogeneity, high purity, and excellent chemical reactivity at a relatively low temperature. By adjusting the processing parameters, the sol-gel technique can be used to prepare hollow sphere and 1D structural materials that exhibit a wide application in the fields of catalyst, drug or gene carriers, photoactive, sensors and Li-ion batteries. This feature article reviewed the development of the preparation of hollow sphere and 1D structural materials using the sol-gel method. The effects of calcination temperature, soaking time, pH value, surfactant, etc., on the preparation of hollow sphere and 1D structural materials were summarized, and their formation mechanisms were generalized. Finally, possible future research directions of the sol-gel technique were outlined.
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