CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Long Zhang,Dongsheng Yang,Lilei Miao,Chunmeng Zhang,Jiexiang Li,Jiawei Wen,Chunxia Wang,Tiantian Cao,Guoyong Huang,Shengming Xu
The nickel-rich layered cathode material LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) has high energy density , lower cost and is a promising cathode material currently under development. However, its electrochemical and structural stability is poor during cycling. Among the many modification methods, cation doping has been consistently proven to be an effective strategy for enhancing electrochemical performance . Herein, the NCM811 cathode material was modified by solid-phase reactions with Mg and Al doped. In addition, the corresponding mechanism of NCM811 cathode material-doped modification is explored by density functional theory (DFT) calculations, and we have extended this approach to other ternary cathode materials with different ratios and obtained universal laws. Combined with DFT calculations, the results show that Mg 2+ occupies the Li + site and reduces the degree of Li + /Ni 2+ mixture; Al 3+ acts as a structural support during charging and discharging to prevent structural collapse. The electrochemical properties were tested by an electrochemical workstation and the LAND system, and the results showed that the capacity retention rate increased to varying degrees from 63.66% to 69.87% and 89.05% for NCM811-Mg and NCM811-Al at room temperature after 300 cycles, respectively. This study provides a theoretical basis and design strategy for commercializing cationic-doped modification of nickel-rich cathode materials.
研究领域:
材料科学
·
电化学
·
能源存储
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计算材料学
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无机固体化学
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2023
·Vol. 10
·期 20
·2300254
·
IF 5.4
Lin Li,Yaojian Zhang,Naifang Hu,Kejian Wang,Yuehui Liu,Xiaogang Wang,Xinhong Zhou,Jun Ma,Guanglei Cui
The high energy density, low cost, and low toxicity of LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathodes has led to their large-scale mass production. However, the poor interfacial stability between NCM811 and organic electrolytes impairs the long-cycle performance of lithium ions batteries. In this study, carbonized polymer dots (CPDs) are successfully introduced onto the surface of NCM811 (NCM811@CPDs) via a simple physical mixing process. CPDs with rich surface oxygen functional groups form strong covalent bonds with transition metal (TM) ions at the NCM811 surface, distinctly restraining surface structure degradation, and transition metal ion dissolution. Furthermore, CPDs facilitate the formation of a compact and steady cathode electrolyte interface (CEI) layer during electrochemical cycling. As a result, the NCM811@1 wt% CPDs exhibit enhanced cycling performance with a capacity retention of 89.77% after 100 cycles at 0.5 C compared to 55.39% of the bare NCM811. This facile and effective surface decoration strategy provides valuable guidance for improving the stability and cycling performance of Ni-rich cathodes.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Lintao Dou,Ao Tang,Weiguang Lin,Xin Dong,Lu Lu,Chaoqun Shang,Zhanhui Zhang,Zhiliang Huang,Katerina Aifantis,Pu Hu,Dongdong Xiao
LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathodes have attracted the attention of the automotive industry due to their higher capacity and operating voltage. Despite their promising electrochemical behavior, these materials do not have a stable cycling performance, as parasitic reactions take place when they come in contact with the electrolyte. Herein, amorphous Nb 2 O 5 is applied as a multifunctional protective layer to stabilize the NCM811 interface, resulting in reduced surface contamination (Li 2 CO 3 ), alleviation of transition metal (TM) ion dissolution, and suppression of surface corrosion and phase transformations during cycling. As a result, after 200 cycles, the coated NCM811 had a capacity of 180 mAh g −1 displaying an excellent capacity retention of 85.7%, which is 30% higher than that of the uncoated samples. Similarly, the Nb 2 O 5 coating allows for an enhanced rate capacity of 139 mAh g −1 at 5 C, compared to 117.6 mAh g −1 for the pure NCM811. In addition, the Nb 2 O 5 coating effectively suppresses the voltage decay with cycling, resulting in a voltage decay of 70 mV after 200 cycles, while a reduction of 190 mV takes place without the coating.
✓ 已验证
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 16
·2107346
·
IF 15.153
Ze Feng,Shan Zhang,Xiaobing Huang,Yurong Ren,Dan Sun,Yougen Tang,Qunxuan Yan,Haiyan Wang
Nickel-rich cathode materials, owing to their high energy density and low cost, are considered to be one of the cathodes with the most potential in next-generation lithium-ion batteries. Unfortunately, this kind of cathode with highly active surface is easy to react with H 2 O and CO 2 when exposed to ambient air, resulting in the formation of lithium impurities and interfacial phase transition as well as deterioration of the electrochemical properties. In this work, the evolution mechanism of the structure and interface of LiNi 0.8 Co 0.1 Mn 0.1 O 2 during air-exposure is systematically investigated. Furthermore, a facile reviving strategy is proposed to restore the degraded LiNi 0.8 Co 0.1 Mn 0.1 O 2 by using LiPO 3 as the repair agent. The lithium impurities on the surface of the degraded sample can transform into the repair/coating layer, and part of the rock salt phase on the subsurface can revive to layered phase after repair heat treatment. As a result, the optimized cathode delivers an initial discharge capacity of 198.3 mAh g −1 at 0.1C and a capacity retention of 85.5% after 50 cycles. Although slightly lower than the bare sample (201 mAh g −1 and 88%), they are obviously higher than the exposed samples (166.5 mAh g −1 and 40.4%). The regenerated electrochemical properties should be attributed to the multifunctional repair layer that can efficiently reduce the surface lithium impurities, prevent the corrosion of electrolyte, and improve the interfacial Li + diffusion kinetics. This work can effectively reduce the waste of the degraded Ni-rich ternary materials and realize the transformation of “waste” into wealth.
研究领域:
材料科学
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电化学
·
能源存储
·
电池技术
·
界面工程
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Guolin Cao,Zhuomin Jin,Yuebing Dong,Qiyong Shi
LiNi0.8Co0.1Mn0.1O2 (NCM811) is considered a cathode material with great commercial potential. However, Li/Ni mixing, residual lithium compounds, and side reaction limited the popularity of Ni-rich batteries. Thus, a simple strategy is employed to realize a comodification of Na+ and Y3+. As demonstrated in the XPS results, the residual lithium compounds (Li2CO3/LiOH) and side reaction products are inhibited. The capacity retention rate of the modified NCM811 is 86.4% after 300 cycles at 1C, 34.5% higher than that of the pristine. Na+ expands the space of the Li+ slab, thereby reducing the charge transfer resistance and inhibiting the mixed discharge of cations. Meanwhile, Y3+ decreased the lattice along c-axis to restrict the movement of cations (Ni2+) into the Li site, with improving the exchange of Li+. The formed LiYO2 coating layer restrains the direct contact between the electrolyte and the electrode material so that side reactions are inhibited, reducing the electrochemical resistance.
研究领域:
材料科学
·
电化学
·
储能技术
·
锂离子电池
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Wen Liu,Xifei Li,Youchen Hao,Hirbod Maleki Kheimeh Sari,Jian Qin,Wei Xiao,Xiujuan Wang,Huijuan Yang,Wenbin Li,Liang Kou,Zhanyuan Tian,Le Shao,Cheng Zhang,Jiujun Zhang
LiNi0.8Co0.1Mn0.1O2 (NCM) is a highly prospective cathode material for high energy density Li-ion batteries (LIBs). Nevertheless, poor cycling performance and rate capability at high cutoff voltages have dramatically blocked its further commercialization. In this study, an ionic conductive interface has been demonstrated to enhance the NCM electrochemical property at the high cutoff voltage of 4.5 V on account of the existence of a Li-ion conductor of Li2SnO3. In comparison to SnO2, Li2SnO3 causes a smoother Li-ion diffusion at the engineered interfaces, lower polarization, slower capacity drop, and voltage fading as well as better H2/H3 reversibility upon cycling. Importantly, it is confirmed that excellent diffusion is beneficial to preservation of reversible phase transition and reduction of polarization, which are directly relative to the superior cyclability and rate capability. This work reveals that building an excellent ionic diffusion interface is feasible for Ni-rich cathodes with simultaneous high capacity and stable cyclability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Tianbiao Zeng,Lichen Zhang,Xingtong Wang,Yihong Ding,Huile Jin
The LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode is susceptible to degradation due to the presence of trace amounts of HF generated from H 2 O interacting with the electrolyte salt LiPF 6 . In this work, Al 2 O 3 -decorated carbon nanotubes was introduced as a conductive additive to safeguard the LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode, resulting in a significant enhancement of its reversible capacity and cycling stability. The electrode incorporated of Al 2 O 3 /CNTs delivered an initial discharge capacity of 184.1 mAh g −1 at 200 mA g −1 under 1.0 C, and retained 65.6 % of its capacity at 100th cycle, outperforming traditional electrodes. The synthesis of Al 2 O 3 /CNTs involves only two straightforward steps: precipitation and heat treatment. Additionally, the amount of this additive occupies a mere 2.0 wt% of the overall electrode material, making it suitable for large-scale applications.
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2021
·Vol. 8
·期 22
·4321-4327
·
IF 4.59
Lintao Dou,Pu Hu,Chaoqun Shang,Heng Wang,Dongdong Xiao,Utkarsh Ahuja,Katerina Aifantis,Zhanhui Zhang,Zhiliang Huang
Ni-rich LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) has been considered as a promising cathode material for high energy density lithium-ion batteries. However, it experiences undesirable interfacial side-reactions with the electrolyte, which lead to a rapid capacity decay. In this work, a homogeneous precipitation method is proposed for forming a uniform silicon dioxide (SiO 2 ) coating on the NCM811 surface. The strong Si−O network provided a stable protective layer between the NCM811 active material and electrolyte to improve the electrochemical stability. As a result, the NCM811@SiO 2 cathode showed superior cycling stability (84.9 % after 100 cycles at 0.2 C) and rate capability (142.7 mA h g −1 at 5 C) compared to the pristine NCM811 cathode (56.6 % after 100 cycles, 127.9 mA h g −1 at 5 C). Moreover, the SiO 2 coating effectively suppressed voltage decay and pulverization of the NCM811 particles during long term cycling. This uniform coating technique offers a viable approach for stabilizing Ni-rich cathode materials for high-energy density lithium-ion batteries. Graphical Silica coated : An urea-assisted homogeneous precipitation method is employed to constructing a uniform coating of amorphous SiO 2 on the surface of NCM811 particles, and the SiO 2 coating layer can effectively suppresses voltage decay and pulverization of the NCM811 particles during long term cycling. Benefiting from the chemically inert coating, NCM811@SiO 2 shows superior cycling stability and rate capability compared to the pristine NCM811 cathode.
研究领域:
材料科学
·
电化学
·
储能
·
电池技术
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2025
·
IF 2.7
Caili He,Jinying Guo,Zhen Guo,Mengqi Ding,Hao Tang,Renjie Wang,Meifang Zhang
Layered oxide LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) is one of the promising cathode materials for high energy lithium ion batteries , which offering enhanced energy density and battery capacity. However, as the reaction progresses, a series of adverse effects arises. In this paper, the dual-additive electrolyte synergistic effect are ingeniously introduced to the traditional electrolyte LiPF 6 to form a low impedance and stable cathode electrolyte interface on the cathode surface. The specific discharge capacity of the battery at 5C was 154 mAh g −1 , while of the base electrolyte was only 106 mAh g −1 . The battery demonstrated over 82 % capacity retention after 200 cycles at 1C, while the base electrolyte was only 62 %.
研究领域:
电化学
·
材料科学
·
能源存储
·
锂离子电池
·
电极界面
·
电解液工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yangfan Zhou,Ziyi Hu,Yuhui Huang,Yongjun Wu,Zijian Hong
Solution wash is a key procedure in the recycling of cathode materials for lithium-ion batteries. It is well-known that Ni-rich ternary cathode material LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM-811) is sensitive to water, triggering the Li + /H + exchange and increasing the cation disorder, which ultimately leads to a large capacity loss during the battery cycling. In this study, we investigated the structural/surface chemical stability as well as the capacity loss for NCM-811 ternary cathodes after washing in five different environmentally friendly and commercially available solutions (i.e., ethanol, methanol, sodium chloride aqueous solution, sodium hydroxide aqueous solution, and deionized water). It is discovered that the capacity decay rate during cycling is closely related to the Li + ion loss after solution wash, the more the Li + ion loss, the quicker the capacity decay during cycling. Among all the solution-washed samples, ethanol-washed samples show minimal Li + ion loss and the best capacity retention. Where the Li + ion loss is only 2%, and the specific capacity after 200 cycles is 2.6 times higher as compared to the water-washed counterparts. This study paves the way towards the practical applications of ethanol in the commercial recycling of NCM-based cathodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Yudong Zhang,Peng Wei,Bo Zhou,Hongshun Zhao,Zihao Wang,Jianmin Ma,Yurong Ren
LiNi00.8Co0.1Mn0.1O2 (NCM811) is perceived as a promising cathode material in lithium-ion batteries for its high specific capacity and low cost. However, the catalytic surface between the cathode and electrolyte leads to intensive interfacial reactions and gas generation, ultimately causing rapid capacity fading and a great threat to the safety performance of the battery, which hinders its applications at high voltages. Herein, ethoxy(pentafluoro)cyclotriphosphazene (PFPN) as the electrolyte additive is applied to alleviate the above problems by constructing a solid electrolyte interphase on the cathode and anode. PFPN can be decomposed preferentially over basic electrolytes to shape the thin and stable interface film between the electrolyte and NCM811 cathode for restraining the production of gas and the corrosion of NCM811. The wettability of the separator can be enhanced by PFPN to promote uniform Li deposition. Also, PFPN has a flame-retardant effect due to its phosphoronitrile functional group. Moreover, the Li||Li symmetrical cells can achieve long-cycling stability with the PFPN-electrolyte (cycling performance of 800 h at 0.5 mA cm–2). Last, the capacity retention of NCM811||Li reaches 89.5% after 200 cycles at 1 C and 4.5 V.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Cheng Chen,Jiali Guo,Chunlei Wu,Xianjian Duan,Lingzhi Zhang
Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) is considered the most prominent cathode material to establish a practical high energy density of lithium-ion batteries (LIBs) for future electric vehicles. The energy density of LIBs is greatly determined by the capacity of electrode materials and the operating voltage of the cells. To further improve the cycle lifespan of NCM811 batteries to meet the requirement of driving range for the electric vehicle market, it is vital to design a novel electrolyte additive that can enhance the stability of the cathode/electrolyte interface at a wide range of voltage. Herein, a novel borate functionalized disiloxane compound, 1,1,1,3,3-pentamethyl-3-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propyl) disiloxane (PMBPDS), is synthesized as cathode electrolyte interphase (CEI) film-forming additive to improve the cycling performance of NCM811 batteries. Systematic studies reveal that PMBPDS can construct a stable CEI film on the NCM811 surface and efficiently scavenge hydrofluoric acid (HF). The PMBPDS-derived CEI prevents the dissolution of transmission metals in the NCM811 cathode and enhances the capacity retention of NCM811/graphite cells from 68.3 to 70.6% after 200 cycles at 1 C in the voltage window of 3–4.5 V. This work provides more understanding on designing the molecular structure of additive compounds for improving the electrochemical performance of LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）