JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Zhijie Bi,Tengfei Wang,Xiaotong Chang,Mengyang Jia,Xiangxin Guo
The garnet Li 7 La 3 Zr 2 O 12 solid electrolyte presents promising potential in application of solid-state lithium batteries because of its high ionic conductivity and stability. However, the critical interfacial issues between cathodes and garnet electrolytes severely restrict capacity and cycling stability of solid batteries. In this work, the partially cyclized polyacrylonitrile (cPAN) nanolayer is coated on high-voltage LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM) cathode particles enabling interface-friendly solid-state garnet batteries. Through controlling cyclized temperature and time, the cyclized part of polyacrylonitrile equipped with delocalized sp 2 π bond presents good capability for electronic transfer, while the residual part not involved in cyclization leaves the coating with certain feature for ionic transfer. In this way, such hybrid-conductivity coating facilitates the transport of both ions and electrons inside the cathode. In addition, the moderate cyclization condition retains the elasticity of polymers, contributing to protection of NCM cathode and suppression of side reactions at NCM/garnet interface during cycling. Therefore, the resultant solid NCM/garnet/Li cell based on the proposed interface engineering strategy delivers a discharge capacity of 176 mAh g −1 with a capacity retention of 82.4 % after 400 cycles. This work puts forwards an attractive strategy to modulate the cathodic interfaces toward solid-state garnet batteries via introducing partially cyclized polyacrylonitrile protective layer with hybrid conductivity.
研究领域:
材料科学
·
电化学
·
储能技术
·
固态电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 23
·2113068
·
IF 19.924
Xufeng Wang,Yajie Song,Xin Jiang,Qingsong Liu,Jidong Dong,Jian Wang,Xin Zhou,Bing Li,Geping Yin,Zaixing Jiang,Jiajun Wang
The complicated interfacial problems of poly(ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) at high voltages severely hinder its practical applications for high-energy-density all-solid-state lithium batteries (ASSLBs). Herein, the failure mechanisms of ASSLBs with LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM)-PEO are studied. It is found that the ASSLBs after charge generates a sharp drop of 0.62 V at the cut-off voltage of 4.30 V, and induce a high interfacial resistance due to forming an uneven thick cathode electrolyte interface on the NCM surface, as well as cause the destruction of NCM surface structure during storage, leading to serious performance degradation. Constructing the interfacial nanolayer with aromatic polyamide (APA) on the surface of NCM active particles (NCM@APA) can mitigate interfacial side reactions between NCM and SPE. Robust interfacial nanolayers not only effectively protect the crystal structure of NCM but also provide a steady interfacial environment for Li + diffusion kinetics. Accordingly, NCM@APA||SPE||Li ASSLBs exhibit an acceptable voltage drop of 0.27 V after 10 days storage and a substantially improved electrochemical performance with an average coulombic efficiency of 99.1% and capacity retention of 76.7% at 30 mA g −1 after 80 cycles.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2018
·Vol. 124
·期 10
·1-7
·
IF 1.604
Xie Tian,Sun Fugen,Zhou Xiaoqing,Liu Li,Liu Zhenyuan,Liu Liekai,Wu Zilong,Yue Zhihao,Zhou Lang,Tang Hao
Material synthesis plays an important role in determining the performance and cost of final devices. In this paper, rheological phase method has been applied to conveniently synthesize carbon-coated LiNi 0.6 Co 0.2 Mn 0.2 O 2 (LNCM622/C) as the cathode material of high-performance lithium-ion batteries (LIBs), avoiding the use of co-precipitation route with complicated procedures and environmental issues. Importantly, the addition of citric acid enabled a relative low temperature of crystallization initiation of the reaction of forming LNCM622/C, which is crucial for the material synthesis. As a result, highly ordered LNCM622/C materials have been obtained with a final calcinating temperature of 900 °C, which is comparable to that being used in co-precipitation route. It is worth mentioning that the synthesis reaction was processed in air without the extra-oxygen gas supply. By varying lithium contents (Li/TM = 0.95, 1.00, 1.05, 1.10, 1.15, and 1.20 by molar, TM = Ni, Co, and Mn), the structure and morphology of resulted LNCM622/C materials were changed, leading to different electrochemical performances of corresponded LIBs. It was found that the Li/TM = 1.15 sample had the best initial discharged capacity at 0.1 °C rate (177.1 mAh g − 1 ), whereas the Li/TM = 1.05 sample showed the best cycling and rate performance (100.6 mAh g − 1 at 1 °C) among synthesized samples. Overall, these results suggest that rheological phase method can be considered as an effective route for synthesizing carbon-coated LiNi 0.6 Co 0.2 Mn 0.2 O 2 cathode materials for high-performance LIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Hao Wang,Wujie Ge,Wen Li,Feng Wang,Wenjing Liu,Mei-Zhen Qu,Gongchang Peng
Dealing with the water molecule on the surface of LiNi0.6Co0.2Mn0.2O2 (NCM) cathode and hydrogen fluoride in the electrolyte is one of the most difficult challenges in Li-ion battery research. In this paper, the surface polymerization of tetraethyl orthosilicate (TEOS) on NCM to generate ethoxy-functional polysiloxane (EPS) wrapped NCM (E-NCM) cathode under mild conditions and without any additions is utilized to solve this intractable problem. The differential scanning calorimetry, transmission electron microscopy, and X-ray photoelectron spectroscopy results show that the formed amorphous coating can provide a protective shell to improve the NCM thermal stability, suppress the thickening of the solid electrolyte interphase (SEI) layer, and scavenge HF in the electrolyte. The E-NCM composite with 2 mol % EPS delivers a high discharge capacity retention of 84.9% after 100 cycles at a 1 C discharge rate in the 2.8–4.3 V potential range at 55 °C. Moreover, electrochemical impedance spectroscopy measurements reveal that the EPS coating could alleviate the impedance rise during cycling especially at an elevated temperature. Therefore, the fabricated E-NCM cathode with long-term cycling and thermal stability is a promising candidate for use in a high-energy Li-ion battery.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Binbin Chu,Longzhen You,Guangxin Li,Tao Huang,Aishui Yu
More and more attention has been focused on Ni-rich ternary materials due to their superior specific capacity, but they still suffer inherent structural irreversibility and rapid capacity degradation under a high voltage. Oxidation of unstable oxygen will lead to the irreversible transformation of the structure. Taking into account the strong W–O bond, an appropriate amount of W-doping is studied to reinforce the thermal stability and electrochemical performance of LiNi0.6Co0.2Mn0.2O2 (NCM622) at 4.5 V. Combining experiments and theoretical calculations, it can be found that W-doping is most preferred at Co sites, and the average charge around O in the NiO6 octahedron becomes more negative after W-doping, which can successfully restrain the release of oxygen, thereby improving the stability of the crystal structure during deep delithiation. In addition, W-doping decreases the energy barrier of the Li+ migration slightly and boosts the kinetic diffusion of lithium ions. As a result, NCM622 doped with 0.5% W boasts an outstanding capacity retention of 96.7% at 1 C after 100 cycles and a discharge specific capacity of up to 152.8 mA h g–1 at 5 C between 3.0 and 4.5 V. Furthermore, analysis of the cycled electrodes indicates that the lattice expansion and the formation of microcracks during long cycling are suppressed after W-doping, thereby elevating the structure and interface stability. Therefore, doping an appropriate amount of W via simple methods is helpful to obtain Ni-rich cathode materials with admirable performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Jiale Fu,Daobin Mu,Borong Wu,Jiaying Bi,Xiaojiang Liu,Yiyuan Peng,Yiqing Li,Feng Wu
Developing high-voltage Li ion batteries (LIBs) is an important trend to meet the requirement of high energy density battery . However, high voltage will cause a series of problems harming the cycle performance of LIBs at the same time. This work is to investigate the effect of inorganic substance Li 2 SiO 3 on the electrochemical performance of LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622) cathode at high cutoff voltage of 4.6 V. XRD result shows that the structure of NCM622 cathode material is not affected by mixing Li 2 SiO 3 . However, XPS and EIS tests indicate that Li 2 SiO 3 has an evident influence on suppressing the decomposition of LiPF 6 and carbonate solvents at high voltage, reducing interfacial solid film impedance and modifying electrode/electrolyte interface. In addition, Li 2 SiO 3 retards the transition metal dissolution by consuming HF. Therefore, it enhances the electrochemical properties of the NCM622 cathode significantly. The highest discharge capacity increases to 191.7 mA h g -1 by mixing Li 2 SiO 3 , compared with the value of 180 mA h g -1 in the case of NCM622 cathode. The NCM622 electrode mixed with Li 2 SiO 3 also exhibits a better capacity retention of 73.4% after 200 cycles and a high rate capability at 20C with the value of 89 mA h g -1 , in contrast with 62.2% and 31 mA h g -1 attained in the NCM622 cathode.
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
·
2021
·
IF 5.316
Wenqian Zhang,Li Xiao,Jiangfeng Zheng,Yuelian Zhong,Bo Shi,Han Chen,Haikuo Fu
The electrochemical properties and thermal stability of the LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622) material have been significantly improved by Nb 2 O 5 nanocoating. The electrochemical properties were researched systematically by various electrochemical tests, and the molar ratio of Nb 2 O 5 to NCM622 was evaluated as 0.5 mol%. Results showed that Nb 2 O 5 nanocoated sample exhibited good cyclic performance, whose capacity retention was 92.36%, whereas that of the bare NCM was only 87.59% after 200 cycles under 1C at 25 °C. In addition, the Nb 2 O 5 surface-coated sample exhibited a good discharge capacity of 164.05 mAh g −1 after 200 cycles under 1C at 60 °C. The result owing to the nano coating of Nb 2 O 5 , which greatly increased the thermal stability, thereby maintaining remarkable specific capacity even in high-temperature environments. The modified sample could maintain a relatively complete structure after cycling, whereas the bare sample had already collapsed. Based on the transmission electron microscopic images, the thickness of the coating layer was about 15 nm. The nanocoating of Nb 2 O 5 was prepared by solid-phase reaction. This method is simple and convenient, which is conducive to industrial production and commercialisation promotion. The Nb 2 O 5 surface coating can enhance the electrochemical properties of the cathode materials , as well as strengthen the thermal and structural stability, which can extend the battery life.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
IONICS
·
2020
·Vol. 26
·期 10
·4937-4948
·
IF 2.394
Tian Leiwu,Yuan Haifeng,Shao Qinjun,Zaidi Syed Danish Ali,Wang Chong,Chen Jian
Surface modification plays a vital role in improving the rate performance and cycling stability of layered Ni-rich LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622) cathode materials for Li-ion batteries. In this study, Li 2 MgTi 3 O 8 (LMTO)-coated NCM622 was successfully synthesized by wet coating combined with sintering process. The results of morphological analysis showed a uniform LMTO layer coated on the surface of NCM622 materials. The dual ions of Ti 4+ and Mg 2+ on surface structure of NCM622 were identified by X-ray diffraction and X-ray photoelectron spectroscopy. The surface coating layer prevented the direct contact between the active cathode material and the electrolyte which significantly reduced the side reactions, and the doping of Ti 4+ and Mg 2+ improved the structural stability of the NCM622 materials. The electrochemical performance indicates that NCM622 cathode with a coating layer of 0.5 wt% LMTO exhibited excellent cycle stability and maintained a capacity retention up to 76% after 200 cycles at 25 °C at 1 C-rate, which was higher than the value of 52% for the NCM622.
✓ 已验证
DOI
高影响因子
Nano Energy
·
2017
·
IF 12.343
Wen Liu,Xifei Li,Dongbin Xiong,Youchen Hao,Jianwei Li,Huari Kou,Bo Yan,Dejun Li,Shigang Lu,Alicia Koo,Keegan Adair,Xueliang Sun
LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM) is a highly potential cathode material for lithium-ion batteries (LIBs). However, its poor rate capability and cycling performance at high cutoff voltages have seriously hindered further commercialization. In this study, we successfully design an ultra-thin lithium aluminum oxide (LiAlO 2 ) coating on NCM for LIBs. Compared to Al 2 O 3 , the utilization of lithium-ion conducting LiAlO 2 significantly improves the NCM performance at high cutoff voltages of 4.5/4.7 V. The study reveals that the LiAlO 2 -coated NCM can maintain a reversible capacity of more than 149 mA h g −1 after 350 cycles with 0.078% decay per cycle. Furthermore, LiAlO 2 -coated NCM exhibits higher rate capacities [206.8 mA h g −1 at 0.2 C (50 mA g −1 ) and 142 mA h g −1 at 3 C] than the Al 2 O 3 -coated NCM (196.9 mA h g −1 at 0.2 C and 131.9 mA h g −1 at 3 C). Our study demonstrates that the ultra-thin LiAlO 2 coating is superior to Al 2 O 3 and significantly improves the capacity retention and rate capability of NCM for LIBs.
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
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Wenlian Wang,Tianxiang Yang,Shuai Li,Jing Lu,Xiaoyang Zhao,Weizhen Fan,Chaojun Fan,Xiaoxi Zuo,Shaolong Tie,Junmin Nan
Lithium-ion batteries (LIBs) with high-nickel ternary material cathode can provide a high specific capacity but are more sensitive to the H 2 O/HF contents and functional additives in the electrolyte. In this work, 1,4-phenylene diisocyanate (PPDI) is developed as an H 2 O/HF scavenger and film-forming electrolyte additive to enhance the performances of pouch LiNi 0 · 6 Co 0 · 2 Mn 0 · 2 O 2 (NCM622)/graphite batteries. Compared with batteries containing the blank electrolyte, the electrochemical performances of batteries with the PPDI-containing electrolyte can be significantly improved. Thereinto, after 600 cycles at room temperature (25 °C) and 300 cycles at high temperature (45 °C), the capacity retentions for the batteries with the PPDI-containing electrolyte are 84.9% and 81.3% at 1C, while the rates for the batteries with the blank electrolyte are only 29.3% and 14.4%, respectively. With the aid of theory calculations and spectroscopic characterization, the reasons behind the performance enhancement are elucidated, and the reaction mechanism of PPDI and H 2 O/HF is proposed. It is demonstrated that PPDI can scavenge H 2 O/HF in the electrolyte and form stable and highly conductive films on two electrodes to stabilize NCM622 and improve battery performances. Besides the functionalized electrolyte, this work can also inspire new ideas to develop functionalized electrolytes for high-performance NCM622-based LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Shuanghui Han,Zhenbang Li,Yuji Zhang,Danni Lei,Chengxin Wang
The practical application of rechargeable lithium metal batteries is limited by inhomogeneous lithium deposition and infinite side reactions. In practical scenarios, the temperature of the battery increases, which may aggravate side reactions and decrease the battery efficiency significantly. Herein, we report a unique lithium thermal reduction method for producing lithium-rich alloys from metal ethoxides. The uniformly distributed nanoscale Li–Al alloy in Li metal anodes can induce the uniform deposition of lithium metal and effectively inhibit side reactions. Therefore, the lithium rich alloy anode presents extremely low overpotential (5 mV) and cycles for 1000 h with no short circuit at the range of 30–60 °C under 0.5 mA cm −2 and 1 mAh cm −2 . When the anode is coupled with a commercial high loading LiNi 0.6 Co 0.2 Mn 0.2 O 2 cathode (8.8 mg cm −2 ), a capacity retention of 72% is obtained after 490 cycles at 30 °C. Furthermore, the cell matched with a higher mass loading LiNi 0.6 Co 0.2 Mn 0.2 O 2 cathode (21.6 mg cm −2 ) maintained a high coulombic efficiency of 99.5% and a stable cycle for 300 h at 60 °C.
研究领域:
材料科学
·
电化学
·
能源存储
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xiaohui Tian,Yanbin Zhu,Zhihao Tang,Pengfei Xie,Angulakshmi Natarajan,Yingke Zhou
A unique 3D porous graphene aerogel wrapped LiNi 0.6 Co 0.2 Mn 0.2 O 2 nanoparticle composite (NCM@GA) was prepared via a facile coprecipitation followed with a hydrothermal treatment . The morphological and structural characterizations reveal that the graphene nanosheets adhere tightly to the NCM nanoparticle surface and randomly intertwine to form a three-dimensional porous conductive aerogel network. The galvanostatic charge/discharge tests imply that the NCM@GA composite displays a high initial discharge capacity of 189.9 mAh g −1 (0.1 C), an excellent rate capability of 130.9 mAh g −1 (5 C) and 106.8 mAh g −1 (10 C), and an outstanding cyclic stability (an average decay rate of approximately 0.04% over 200 cycles at 1 C). The outstanding electrochemical performance is due to the synergy between the porous GA framework and the well-dispersed NCM nanoparticles, which facilitates the rapid diffusion of both Li + and electrons and accommodates the volumetric change during the Li + insertion/deinsertion process. The novel electrode design strategy described here is promising for constructing other advanced composite cathodes used in power Li-ion batteries.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
固体物理
·
功能材料
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）