Article
Chemistry, Physical
Minsang Jo, Seong-Hyo Park, Hochun Lee
Summary: The study found that adding monobasic sodium phosphate (P2) to the electrolyte can effectively reduce manganese dissolution, thus improving the thermal stability and cyclability of LiMn2O4 (LMO) spinel cathode materials. P2 can suppress the hydrofluoric acid content in the electrolyte and form a protective cathode electrolyte interphase layer, mitigating the manganese dissolution behavior of the cathode material.
Article
Materials Science, Multidisciplinary
Jin Liu, Xingcheng Xiao, Daad Haddad, Qinglin Zhang, Mei Cai, Sherman Zeng
Summary: The study shows that using lithium-ion exchanged zeolite (Li-zeolite) as an additive to cathode electrodes can improve battery cycle life, especially performing better at high temperatures. Li-zeolite is envisioned as a low-cost and scalable path to enhance the performance of LMO and LMO blended electrodes.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Chemistry, Multidisciplinary
Eunjung Yoon, Jihye Lee, Seongmin Byun, Dohyun Kim, Taeho Yoon
Summary: This study provides important insights into improving the stability of current collectors at high voltages by examining the composition and morphology evolution of the passivation layer on aluminum.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Yuji Mahara, Naoyuki Nagasako, Hideaki Oka, Yasuhito Kondo, Satoru Kosaka, Hiroyuki Nakano, Takamasa Nonaka, Yoshinari Makimura
Summary: In this study, we found that Li1.12Mn0.74O1.60F0.40 positive electrodes with a loose-crystalline rock salt structure show stable and high capacity, with little change in the charge-discharge curve. The introduction of F-Mn bonds in the positive electrode suppresses the local spinel transition in Mn-based positive electrodes.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Yuji Mahara, Yoshinari Makimura, Hideaki Oka, Hiroyuki Nakano, Shin Tajima, Takamasa Nonaka, Tsuyoshi Sasaki
Summary: Research on loose-crystalline rock-salt LiMnO2 synthesized via a mechanochemical method shows high capacity and characteristic signal similar to spinel Li-Mn oxide. In-situ measurements indicate that the lithium storage process of LCRS-LMO is related to spinel-related structure changes during charge/discharge cycles.
JOURNAL OF POWER SOURCES
(2021)
Article
Crystallography
Ana Robba, Elena Tchernychova, Jan Bitenc, Anna Randon-Vitanova, Robert Dominko
Summary: The study investigated the magnesiation behavior, cycling performance, and structural stability of (MgxLi1-x)Mn2O4 spinel cathodes under different electrolyte conditions. Cycling in aqueous electrolyte showed high reversibility but experienced large polarization and capacity fading, while cycling in non-aqueous electrolyte led to lower initial capacity and faster failure. However, cycling in a specific non-aqueous electrolyte exhibited excellent cycling performance with low polarization and near theoretical Mg insertion voltages.
Article
Nanoscience & Nanotechnology
Xue-Wen Wu, Shao-Lun Cui, Sheng Liu, Guo-Ran Li, Xue-Ping Gao
Summary: The use of anodic aluminum oxide (AAO) membranes to create highly ordered channels on the metallic lithium anode surface can prevent dendritic lithium deposition, thus improving the cycling performance of lithium batteries.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Editorial Material
Energy & Fuels
Michael M. Thackeray, Khalil Amine
Summary: Lithium-nickel-manganese-cobalt oxides are increasingly the preferred cathode type in automobile batteries due to their superior energy density compared to other types of electrodes.
Article
Nanoscience & Nanotechnology
Chao Zou, Yun Huang, Ling Zhao, Wenhao Ren, Zhixing Zhao, Jiapin Liu, Xing Li, Mingshan Wang, Bingshu Guo, Yuanhua Lin
Summary: This study utilizes branched polyethyleneimine as a functional binder to address the electrode deterioration and capacity decay caused by the dissolution of transition metal ions. The binder can effectively absorb soluble transition metal ions, reduce the loss of active materials, and achieve uniform distribution of key components. This leads to improved rate capability and cycle stability of the battery.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Tao Wang, Zhanjun Chen, Deliang Chen, Ruirui Zhao
Summary: A novel porous MnO-SiOx @C composite with a mesoporous structure and carbon coating has been successfully prepared as an anode material for lithium-ion batteries. The enhanced electrochemical performance is attributed to the segregation of MnO and SiOx during delithiation, the presence of uniform carbon layers and abundant nanopores, and the formation of Mn2SiO4 phase as a joint to relieve strain force.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Chunliu Li, Banglei Zhao, Junfeng Yang, Linchao Zhang, Qianfeng Fang, Xianping Wang
Summary: Li2ZrO3-coated and Al-doped micro-sized monocrystalline LiMn2O4 powder shows superior cycling and rate performance, attributed to the synergistic effect of Al-doping and Li2ZrO3-coating.
Article
Chemistry, Inorganic & Nuclear
Peiyu Hou, Yuhang Tian, Zezhou Lin, Mohan Dong, Feng Li
Summary: Tuning the exposed crystal facets of LiMn2O4 cathode, particularly the {111}, {110}, and {100} facets, can enhance their structural stability in advanced lithium-ion batteries. The impact of these varied exposed facets on the electrochemical properties is still under debate. In this study, octahedral LiMn2O4 with only {111} facets and truncated octahedral LiMn2O4 (TO-LMO) with both {111} and {100} facets were designed. TO-LMO with different ratios of {100}/{111} facets were prepared using a Li-deficient composite. It was found that the incorporation of {100} facets on the {111} facets effectively reduces the dissolution of Mn2+ into the electrolyte, leading to improved cycling stability, especially at high temperatures.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Nigel Becknell, Pietro P. Lopes, Toru Hatsukade, Xiuquan Zhou, Yuzi Liu, Brandon Fisher, Duck Young Chung, Mercouri G. Kanatzidis, Nenad M. Markovic, Sanja Tepavcevic, Vojislav R. Stamenkovic
Summary: This study demonstrates that the intrinsic instability of an electrochemical interface can be turned from an obstacle into an advantage in aqueous zinc-ion batteries, where manganese oxide (MnO2) shows considerable dissolution even in electrolyte containing Mn2+ salt. Balancing with redeposition can alleviate the harmful impact of dissolution on performance and alter the trajectory of the active phase.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Kazuhiko Mukai, Takamasa Nonaka, Takeshi Uyama
Summary: Research revealed a two-phase reaction scheme in lithium titanium oxide during lithium-ion battery operation, with distinct structural transformations observed at different scales. Linear, reversible changes in bond distance between titanium and oxygen atoms were observed at the atomic scale, while hysteresis in lattice parameter between discharge and charge reactions was noted at the microscale. These differences in structural changes were attributed to variances in spatial resolutions between XAS and XRD techniques.
ENERGY STORAGE MATERIALS
(2022)
Article
Electrochemistry
Kingo Ariyoshi, Kensuke Kajikawa, Yusuke Yamada
Summary: The study focuses on the crystal structure of low-temperature LiNi1/2Mn1/2O2, a material with a cubic lattice and high reversible capacity, combining the advantages of layered and spinel structures. This new material has potential applications in improving the energy density of Li-ion batteries.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2022)
Article
Chemistry, Physical
Seunghyeon Jo, Bomee Kwon, Jeongeun Oh, Jeonghyeop Lee, Kyobin Park, Kyu Tae Lee
Summary: This study demonstrates the formation mechanism of columnar and spherical Li metal by investigating the competition among heterogeneous Li nucleation, Li growth, and homogeneous Li nucleation, supported by classical nucleation theory. The thickness and diameter of columnar Li metal are precisely controlled by regulating the rates of the three reaction steps. Columnar Li metal electrodes also show improved electrochemical performance compared to conventional Li metal foil.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Editorial Material
Chemistry, Physical
Saehun Kim, Tae Kyung Lee, Sang Kyu Kwak, Nam-Soon Choi
Summary: The use of role-assigned ionic additives with different characteristics allows for the construction of a multilayer solid electrolyte interphase on Li metal anodes, effectively suppressing the formation of Li dendrites.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Physical
Sohee Kim, Jinok Yuk, Songmi Kim, Yuho Song, Sooyong So, Kyu Tae Lee, Tae-Ho Kim, Jae Hee Ham
Summary: In this study, advanced porous separators with thin selective skin layers were developed to reduce hydrogen permeation in alkaline water electrolysis applications. The optimized separator with a cPVA skin layer demonstrated a low ionic resistance, high bubble point pressure, and low hydrogen permeability, achieving high current densities in a 30 wt% KOH electrolyte solution.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Physical
Saehun Kim, Sung O. Park, Min-Young Lee, Jeong-A Lee, Imanuel Kristanto, Tae Kyung Lee, Daeyeon Hwang, Juyoung Kim, Tae-Ung Wi, Hyun-Wook Lee, Sang Kyu Kwak, Nam-Soon Choi
Summary: The advancement of electrolyte systems has facilitated the development of high-performance Li metal batteries by creating robust electrode-electrolyte interfaces, which address the challenges of dendritic Li growth and irreversible Li plating/stripping. The application of specific electrode-electrolyte interface modifiers, LiNO3 and LiDFBP, have demonstrated improved cycle life and Coulombic efficiency for Li|NCM811 full cells.
ENERGY STORAGE MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Seon Yeong Park, Sewon Park, Hyeong Yong Lim, Moonsu Yoon, Jeong-Hee Choi, Sang Kyu Kwak, Sung You Hong, Nam-Soon Choi
Summary: The use of 1,2-bis(diphenylphosphino)ethane (DPPE) can effectively reduce the dissolution of nickel ions and electrolyte decomposition, and improve the cycle life and safety of lithium-ion batteries.
Article
Nanoscience & Nanotechnology
Chaeeun Song, Hyeongyu Moon, Kyungeun Baek, Chorong Shin, Kwansoo Lee, Seok Ju Kang, Nam-Soon Choi
Summary: Nickel-rich layered oxides have high potential as cathode materials for high-energy Li-ion batteries, but practical applications are hindered by issues such as metal dissolution and reactive compound formation. This study demonstrates that the supplementation of electrolyte with tert-butyldimethylsilyl glycidyl ether (tBS-GE) can inhibit the interfacial degradation of LiNi0.9CoxMnyAlzO2 (NCMA) cathode and graphite (Gr) anode caused by HF. The tBS-GE scavenges HF and stabilizes the electrode surfaces, while its reaction with CO2 suppresses battery swelling. Adding 0.1 wt% tBS-GE to the electrolyte leads to improved capacity retention and discharge capacity of the NCMA/Gr full cells.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Hyeongyu Moon, Huibeom Nam, Min Pyeong Kim, Seung Min Lee, Hyeongjun Kim, Min Ho Jeon, Yoon-Sung Lee, Koeun Kim, Joong-Hyun Chun, Sang Kyu Kwak, Sung You Hong, Nam-Soon Choi
Summary: The key to producing high-energy Li-ion cells is to ensure the stability of the interfaces between Si-containing anodes and Ni-rich cathodes. A multi-functional electrolyte additive, 4-(allyloxy)phenyl fluorosulfate (APFS), is used to create a solid electrolyte interphase (SEI) and a stable cathode-electrolyte interface. The combination of vinylene carbonate (VC) and APFS allows for high capacity and capacity retention in full cells.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Environmental
Seung Hee Han, Seoyoung Kim, Hyeong Yong Lim, Sewon Park, Kyungjae Shin, Seungwon Kim, Hee-Tak Kim, Sang Kyu Kwak, Changduk Yang, Nam-Soon Choi
Summary: Flowless Zn-Br-2 batteries have potential for energy storage applications, but face challenges such as bromine crossover and electrolyte decomposition. Introducing PV(Br)(4)/GF electrode improves cycle stability. PV(Br)(4) entraps corrosive Br2, produces polybromide anions during charging, and releases Br- during discharging. PV(Br)(4) on GF electrode inhibits water decomposition and promotes better battery performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Sewon Park, Gayoung Choi, Hyeong Yong Lim, Kyung Moon Jung, Sang Kyu Kwak, Nam-Soon Choi
Summary: In this study, a multifunctional electrolyte additive called BTSPFA was developed to enhance the interfacial stability of graphite anodes and Ni-rich cathodes in Li-ion cells. BTSPFA eliminates corrosive HF molecules, promotes the formation of a polar CEI on the Ni-rich cathode, and suppresses the reduction of the electrolyte. The synergistic effect of BTSPFA effectively prevents TM leaching from the cathode and unwanted TM deposition on the anode. LiNi0.8Co0.1Mn0.1O2/graphite full cells with 1 wt % BTSPFA showed enhanced discharge capacity retention of 79.8% after 500 cycles at 1C and 45°C.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Polymer Science
Orynbassar Mukhan, Ji-Su Yun, Eun Kyung Kim, Sang-Gu Ji, Nurzhan Umirov, Byoung-Min Lee, Chang-Uk Jeong, Sung-Soo Kim, Jae-Hak Choi
Summary: This study evaluates the electrochemical performance of Si alloy-based anodes with poly (ether imide) (PEI) binder after thermal treatment at various temperatures. The results show that thermal treatment at above 500 degrees C partially carbonizes the PEI binder and significantly enhances electrochemical performance such as cycle life and high rate capabilities. The partially carbonized PEI acts as a binder and conductive additive, maintaining good electrical contacts between active materials, electronic conductors, and current collector during cycling. This partial carbonization strategy offers a new approach for developing next-generation high-capacity batteries.
Article
Multidisciplinary Sciences
Hyeokjin Kwon, Hyun-Ji Choi, Jung-kyu Jang, Jinhong Lee, Jinkwan Jung, Wonjun Lee, Youngil Roh, Jaewon Baek, Dong Jae Shin, Ju-Hyuk Lee, Nam-Soon Choi, Ying Shirley Meng, Hee-Tak Kim
Summary: A composite layer on the lithium metal electrode is designed to reduce the loss of liquid electrolyte, solving the issue of irreversible consumption and enabling long-cycling lithium metal batteries.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Gun Park, Hyeongyu Moon, Sunyoung Shin, Sumin Lee, Yongju Lee, Nam-Soon Choi, Seungbum Hong
Summary: The use of single-walled carbon nanotubes as conductive additives helps preserve electron-conduction channels and stabilize electrochemical reactions in Si-based anode materials. The role of SWCNTs in ensuring uniform volume change during cycling and alleviation of particle pulverization is revealed through surface potential mapping.
ACS ENERGY LETTERS
(2023)
Review
Chemistry, Multidisciplinary
Sewon Park, Saehun Kim, Jeong-A. Lee, Makoto Ue, Nam-Soon Choi
Summary: The coevolution of liquid electrolyte and electrode chemistries is crucial for the development of next-generation batteries, as wrong combinations can lead to battery failure. This review focuses on sacrificial compound-based interfacial engineering to alleviate volumetric stress and improve the commercialization of silicon and lithium-metal anodes. It also discusses how the regulation of lithium-ion solvation structures can enhance electrolyte formulations and improve solid electrolyte interphases (SEIs) for longer-lasting high-capacity anodes.
Article
Chemistry, Multidisciplinary
Jinuk Kim, Jioh Kim, Jooyoung Jeong, Jiwon Park, Cheol-Young Park, Sewon Park, Shin Gwon Lim, Kyu Tae Lee, Nam-Soon Choi, Hye Ryung Byon, Changshin Jo, Jinwoo Lee
Summary: This study demonstrates that NaH can work as a good SEI layer apart from NaF, and proposes a cost-effective, F-free electrolyte for practical and large-scale SWBs.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Physical
Chanhyun Park, Eunryeol Lee, Su Hwan Kim, Jung-Gu Han, Chihyun Hwang, Se Hun Joo, Kyungeun Baek, Seok Ju Kang, Sang Kyu Kwak, Hyun-Kon Song, Nam-Soon Choi
Summary: This study investigates the role of MA-C60 as an electrolyte additive in lithium-ion batteries and finds that it can deactivate reactive radical species and maintain the structural stability of the cathode, overcoming some challenges in using LiNi1-x-yCoxMnyO2 cathodes.
JOURNAL OF POWER SOURCES
(2022)
