JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Genjie Huang,Yu Zhong,Xinhui Xia,Xiuli Wang,Changdong Gu,Jiangping Tu
Sulfide-based all-solid-state lithium batteries (ASSLBs) with high-voltage Ni-rich layered cathodes have shown great potential in energy storage systems. However, the application of ASSLBs is hindered by severe interface issues and poor solid–solid contact between cathodes and sulfide electrolytes. In this work, a suitably thin Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) coating (0.41 mS cm −1 ) is introduced onto the surface of single-crystal LiNi 0.6 Co 0.2 Mn 0.2 O 2 particles to mitigate interface side reactions. Subsequently, sheet-type electrodes are fabricated by the infiltration of Li 10 GeP 2 S 12 to fill the voids and achieve highly dense solid–solid contact, thus preventing contact loss. The Li 10 GeP 2 S 12 -infiltrated ASSLBs with a LAGP buffer layer display a high initial discharge capacity of 141.5 mAh g −1 at 0.05 C and ultrastable cycling for 100 cycles at 0.1 C. An effective fabrication method for highly dense electrodes is proposed in this work, which provides a new direction for scalable industrial production.
研究领域:
材料科学
·
储能技术
·
电化学
·
固体离子学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Jiale Fu,Daobin Mu,Borong Wu,Jiaying Bi,Hui Cui,Hao Yang,Hanfeng Wu,Feng Wu
An amount (5 wt %) of lithium tungstate (Li2WO4) as an additive significantly improves the cycle and rate performances of the LiNi0.6Co0.2Mn0.2O2 electrode at the cutoff voltage of 4.6 V. The 5 wt % Li2WO4-mixed LiNi0.6Co0.2Mn0.2O2 electrode delivers a reversible capacity of 199.2 mA h g–1 and keeps 73.1% capacity for 200 cycles at 1 C. It retains 67.4% capacity after 200 cycles at 2 C and delivers a discharge capacity of 167.3 mA h g–1 at 10 C, while those of the pristine electrode are only 44.7% and 87.5 mA h g–1, respectively. It is shown that the structure of the LiNi0.6Co0.2Mn0.2O2 cathode material is not affected by mixing Li2WO4. The introduced Li2WO4 effectively restrains the LiPF6 and carbonate solvent decomposition by consuming PF5 at high cutoff voltage, forming a stable cathode/electrolyte interface film with low resistance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yongshun Liang,Lang Xu,Ya Li,Jie Ding,Yiyao Li,Kaijiao Duan,Wei Bai,Junming Guo,Mingwu Xiang
Layered Ni-rich oxides LiNi x Co y Mn 1-x-y O 2 (x ≥ 0.6, x + y = 1) are considered the best promising cathode material for high-performance lithium-ion secondary batteries. However, the time-consuming and complicated preparation process of spherical precursors greatly increases the consumption of energy and time, whilst suffering the challenges of liquid waste and Li uniform distribution. Herein, a simple microwave liquid phase flameless combustion method with the advantages of time-saving and energy-conservation has been proposed to synthesize Ni-rich LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM 622 ). The NCM 622 powders with uniform element distribution are obtained by heating the liquid mixture of raw materials in a simple domestic microwave oven only for 5 minutes and without waste liquid production. Subsequently, the microwave-synthesized NCM 622 powders are further calcined in high-temperature with different temperatures and time in order to obtain the final products with high crystallinity and good electrochemical performances. As a result, the optimal NCM 622 cathode material calcined at 800 °C for 14 h exhibits excellent irregular polyhedral morphology and low degree of Li + /Ni + mixing, whilst displays high first discharge capacity of 179.1 mAh g −1 and 204.9 mAh g −1 with the capacity retention of 88.21 % and 81.36 % (100 cycles) in 3–4.3 V and 3–4.5 V (0.2 C), respectively.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Energy Technology
·
2019
·Vol. 7
·期 4
·1800981
·
IF 3.163
Bangwei Deng,Hao Wang,Xiang Li,Yan Ding,Daming Sun,Jun Ma,Mianzhong Chen,Tao Chen,Feng Gao,Meizhen Qu,Gongchang Peng
Tris(trimethylsilyl)phosphite (TMSPi) has been reported to be an excellent electrolyte additive. However, scarce reports exist on the effect of the charge cutoff potential on the cyclic stability using high-performance LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622)–mesocarbon microbead (MCMB) full cells. Herein, a high-loading and repeatable NCM622–MCMB coin-type full cell is successfully prepared, and the role of TMSPi on such a full cell at charge cutoff potentials of 4.25 and 4.45 V is studied. Theoretical calculations and detailed analyses reveal that it is oxidized in the first charging process due to its unsaturated P—O bonds, thus forming a stable P—O—F-rich cathode electrolyte interphase and preventing severe decomposition of the electrolyte over NCM622 during long-term cycling. In addition, the P—O and Si—O bonds of TMSPi both display HF-scavenging ability. Moreover, TMSPi may react directly with the LiPF 6 -based electrolyte to form some intermediate products that can be reduced on the MCMB electrode, thereby modifying the solid electrolyte interphase and improving the stability of MCMB during lithium intercalation.
研究领域:
电化学
·
材料科学
·
能源存储
·
锂离子电池
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界面化学
·
电极材料
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Xun Yuan,Meiting Huang,Qun Cao,Yifeng Li,Haoxuan Yu,Lihua Wang,Liang Chen,Guang Yang,Tian Liu,Xubiao Luo,Liming Yang
High level endogenous Al impurities in S–NCM622 are directly doped into NCM. • The regeneration process does not require additional agents. • The molten–salt strategy enabled rapid Li replenishment and Al incorporation. • Al doping stabilizes lattice oxygen and reinforces the layered structure. • The R–NCM622–Al sample exhibits outstanding electrochemical performance. Direct regeneration of severely damaged LiNi 1-x-y Co x Mn y O 2 (NCM) cathodes are commonly limited by the intrinsic instability and high chemical consumption. Meanwhile endogenous Al remaining during the regeneration process can be directly utilized as effective dopants for NCM regeneration. Yet, current endogenous Al doping strategies commonly lack efficient control over the Al doping pathway and exhibit unsatisfactory charge–discharge performance of regenerated NCM. Herein, we propose an one step thermal diffusion driving endogenous Al doping strategy for the upgraded regeneration of severely degraded LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622). The regenerated Al–doped NCM622 exhibits enhanced structural stability, thus showing excellent cycling stability. Specifically, it delivers a high initial discharge capacity of 183.9 mAh g −1 , along with an ultralow capacity fading rate of 0.0577% per cycle over 300 cycles. Such excellent performance is attributed to as high as 2 wt% Al doping, which significantly suppresses lattice oxygen diffusion and enhances the structural robustness. This work provides a practical and scalable strategy for the advanced regeneration of severely degraded NCM by utilizing endogenous Al impurities, offering a new perspective for overcoming the challenges of regenerated NCM cathodes. An upgraded regeneration strategy utilizing endogenous Al doping is developed for S–NCM622, in which thermally diffused into the lattice assisted by a eutectic molten salt, enabling concurrent lithium replenishment, Al doping and structural restoration to achieve high performance NCM622. Download: Download high-res image (472KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 8
·4670-4677
·
IF 7.79
Liang Wang,Jiashun Liang,Xiaoyu Zhang,Shenzhou Li,Tanyuan Wang,Feng Ma,Jiantao Han,Yunhui Huang,Qing Li
Ni-rich ternary layered oxides represent the most promising cathodes for lithium ion batteries (LIBs) due to their relatively large specific capacities and high energy/power densities. Unfortunately, their inherent chemical instability and surface side reactions during the charge/discharge processes lead to rapid capacity fading and poor cycling life, which seriously restrict their practical applications. Herein, we report a simple dual-modification strategy for preparing LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode materials by Li2SnO3 surface coating and Sn4+ gradient doping. The gradient Sn doping stabilizes the layered structure due to the strong Sn–O covalent bond and relieves the Li+/Ni2+ cation disorder by the partial oxidation of Ni2+ to Ni3+. Besides, the ionic and electronic conductive Li2SnO3 coating serves as a protective layer to eliminate the side reactions with electrolyte/air. In LIB testing, the dual-modified NCM622 cathode with 2% Sn delivers an enhanced cycling performance with 88.31% capacity retention after 100 cycles from 3.0 to 4.5 V at 1C compared to the bare NCM622. Meanwhile, the dual-modified NCM622 shows an improved reversible capacity of 136.2 mA h g−1 at 5C and enhanced electrode kinetics. The dual-modification strategy may enable a new approach to simultaneously relieve the interfacial instability and bulk structure degradation of Ni-rich cathode materials for high energy density LIBs.
研究领域:
材料科学
·
电化学
·
储能
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Zhikun Zhao,Ziyue Wen,Chunli Li,Yin Ding,Ying Jiang,Feng Wu,Borong Wu,Shi Chen,Daobin Mu
Herein we combine X-ray photoelectron spectroscopy, AC impedance experiments and high resolution transmission electron microscopy to provide new insight into the degradation mechanism of a nickel-rich cathode material under different charge voltages. The degradation is closely related to the charge/discharge cut-off voltage. We use a simple in-situ method to generate a stable Li 2 WO 4 layer with a thickness of ∼10 nm on the LiNi 0.6 Co 0.2 Mn 0.2 O 2 surface during the calcination process using (NH 4 ) 2 WO 4 . This decorated layer prevents side reactions and reduces formation of the insulators LiF and Li 2 CO 3 on the surface of the particles. Electrochemical impedance spectroscopy shows that the Li 2 WO 4 layer has no effect on the interphase film resistance of the cathode/electrolyte, which remains stable during the cycling process. The charge transfer of LiNi 0.6 Co 0.2 Mn 0.2 O 2 is improved a lot by the decorated layer. Transmission electron microscopy shows that increasing amounts of a rock-salt phase substance forms with increasing cut-off voltage, while for the Li 2 WO 4 -decorated sample only a small amount of rock-salt forms on the surface of the cathode material. This study illustrates the relationship between changes in the surface structure with different cut-off voltages and the electrochemical performance, and provides an effective approach to improve the cycling performance of nickel-rich cathode materials.
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
·
2018
·
IF 3.779
Yan Ding,Bangwei Deng,Hao Wang,Xiang Li,Tao Chen,Xinxiu Yan,Qi Wan,Meizhen Qu,Gongchang Peng
Reducing the lithium residues on the surface of LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM) cathode is one of the most main challenges in Li-ion battery research. To address this task, a surface coating of Prussian blue (PB) of metal-organic framework is applied to NCM cathode to solve this intractable problem via a simple dry-coating method. The transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) results show that the uniform smooth coating can provide a protective shell to block H 2 O and CO 2 absorption from the air, suppressing lithium residues formed on the surface. The color change experiment between PB and Li residuals illustrates PB can react directly with surface residual lithium species. As a result, the amount of residual lithium, such as LiOH and Li 2 CO 3 , is significantly reduced. The 0.5 wt% PB-modified NCM delivers a high discharge capacity retention of 81% after 500 cycles at 1 C discharge rate and exhibits a superior storage property after storing in air for 14 days. Furthermore, electrochemical impedance spectroscopy (EIS) confirms that the PB-NCM could hinder the impedance increase during cycling. These results clearly indicate that the PB coating layer contributes to the reduction of lithium residues and the creation of thinner cathode-electrolyte interface, improving structural stability and cycling performance of NCM.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
IONICS
·
2021
·Vol. 27
·期 8
·3239-3249
·
IF 2.817
Li Ying,Yu Chunpeng,Xu Chaoxiang,Liu Wenbo,Dang Mengyue,Jin Hongming,Li Wenxian,Zhang Jiujun
Layered LiNi 0.6 Co 0.2 Mn 0.2 O 2 as a promising cathode material for lithium-ion batteries possesses high theoretical capacity and broad application prospects. However, the destruction of structure during the cycles and the insufficient conductivity severely restrict the cycle life and rate capacity, especially at high cut-off voltage. As an improvement, the dual-coating of LiAlO 2 and graphene oxide (GO) was designed to modify the microstructure and migration dynamics of NCM622 surface. Compared to single coating, LiAlO 2 /GO showed a synergistic effect that simultaneously increased ion/electron transfer rate, reversibility and cycling stability of the cathode material. As a result, the initial capacity of the dual-coating material was 182.6 mAh/g at 200 mA/g (1 C) with a capacity attenuation of 0.06% per cycle in 200 cycles, while it was 222.6 mAh/g at 20 mA/g (0.1 C), and the rate capacity was 100.4 mAh/g at 2000 mA/g (10 C) in a voltage range of 3.0–4.5 V.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Shengjie Liu,Hao Wu,Ling Huang,Mingwu Xiang,Heng Liu,Yun Zhang
Ni-rich ternary layered oxides , (LiNi x [M] 1−x O 2 , x ≥ 0.5, M = Co and Mn), have become one of the mainstream cathode materials for next-generation lithium-ion batteries due to their high capacity and cost efficiency compared with LiCoO 2 . However, the high-voltage operation of the Ni-rich oxides (>4.3 V) required for high capacity is inevitably accompanied with a rapid capacity decay over numerous cycles. In this work, we reported a surface coating of LiNi 0.6 Co 0.2 Mn 0.2 O 2 with Li 2 Si 2 O 5 via a facile and efficient synthetic approach, which involves the employment of silicic acid (H 2 SiO 3 ) as remover to react with the surface residual lithium compounds ( e.g. Li 2 CO 3 and LiOH) of LiNi 0.6 Co 0.2 Mn 0.2 O 2 and consequent formation of a robust and complete Li + -conductive Li 2 Si 2 O 5 protective coating layer . The structure and morphology of the coated cathode materials are fully characterized by using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Compared with the pristine LiNi 0.6 Co 0.2 Mn 0.2 O 2 , coating with the Li + -conductive Li 2 Si 2 O 5 is found to be very effective for improving the rate capability of the LiNi 0.6 Co 0.2 Mn 0.2 O 2 when evaluated at a high cut-off voltage up to 4.5 V. Specifically, 1 wt. % H 2 SiO 3 -treated LiNi 0.6 Co 0.2 Mn 0.2 O 2 electrode exhibits high discharge specific capacities of 213.9 and 121.6 mAh g −1 at 0.1 and 10 C, respectively, whereas the pristine electrode only shows 196.8 and 92.1 mAh g −1 . Besides, the surface-modified LiNi 0.6 Co 0.2 Mn 0.2 O 2 electrode also manifests an enhanced long-term cycling stability (67% capacity retention after 200 cycles at 5 C), much better than the pristine electrode (52% retention) due to the robust protective effect of the Li 2 Si 2 O 5 coating layer. All these results indicate that the Li 2 Si 2 O 5 -coated LiNi 0.6 Co 0.2 Mn 0.2 O 2 will be a promising cathode material for lithium-ion batteries with fascinating electrochemical energy storage capabilities.
研究领域:
电化学
·
材料科学
·
能源存储
·
锂离子电池技术
·
固态化学
·
表面改性
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Xiaodan Yan,Cheng Chen,Xuequan Zhu,Lining Pan,Xinyue Zhao,Lingzhi Zhang
A novel aminoakyldisiloxane compound, (3-( N, N -dimethylamino)diethoxypropyl) pentamethyldisiloxane (DSON), is reported as an effective electrolyte additive for improving the electrochemical performances of high energy density power batteries of nickel-rich LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622)/graphite. The NCM622/graphite cells using DSON addition in the carbonate-based reference electrolyte exhibit enhanced electrochemical performances, especially high temperature performances including long cycle life and high temperature storage. The pouch cell (1 Ah) with 0.2 wt% DSON retained a capacity of 88% as compared with 84% for that without DSON in electrolyte after 200 cycles at 45 °C. The mechanism investigation reveals that DSON acts as a film-forming additive for constructing uniform conductive cathode electrolyte interphase (CEI) layer upon NCM622 particles, which suppresses the internal cracks and prohibits the irreversible phase transformation of NCM622. DSON also serves as an effective water/acid scavenger and inhibits the hydrolysis of LiPF 6 , thus effectively blocking the occurrence of side reactions and the dissolution of transition metal ions from cathode. Therefore, NCM622 cathode sheet maintains a better integrity surface morphology after 100 cycles. This work demonstrates that aminoakyldisiloxane is promising for practical use as effective electrolyte additive for high energy density power batteries of nickel-rich NCM/graphite.
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Yi Duan,Xiaopeng Qi,Xiangtao Bai,Tianwei Yu,Yanlong Wu,Zenghua Chang,Jiantao Wang
Argyrodite Li 6-x PS 5-x Cl 1+x with high ionic conductivity and excellent mechanical performance is an attractive solid electrolyte candidate for all-solid-state lithium batteries (ASSLBs). Adjusting Cl content is an effective strategy to enhance the ionic conductivity, however its effect on the thermal stability remain uncovered. Herein, our study shows that the increase of Cl content in Li 6-x PS 5-x Cl 1+x significantly enhances the ionic conductivity and electrochemical properties but significantly reduces its thermal stability. We reveal that the thermal stability of Li 6-x PS 5-x Cl 1+x is heavily dependent on its Cl content and can be significantly enhanced by elemental doping. LiNi 0.6 Co 0.2 Mn 0.2 O 2 based ASSLBs using Cl-rich argyrodite with pure phase shows better cycle performance. Achievements from this study could serve as a guidance for optimizing and applicating argyrodite solid electrolytes towards high-performance and safe ASSLBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）