IONICS
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2021
·Vol. 27
·期 7
·2867-2876
·
IF 2.817
Yu Juan,Peng Jiaxin,Huang Wenlong,Wang Lejie,Wei Yinbo,Yang Naixing,Li Linbo
A Li 2 MoO 4 -coated LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode material was successfully synthesized by introducing Mo source during the lithium mixing process. The influence of Li 2 MoO 4 -coating on the structure, morphology, and electrochemical performance related to LiNi 0.8 Co 0.1 Mn 0.1 O 2 has been studied. The results of the cyclic voltammetry (CV) and differential voltage curve measurement show that the electrode polarization and irreversible capacity of the modified LiNi 0.8 Co 0.1 Mn 0.1 O 2 are smaller than the virgin material. Meanwhile, the capacity retention of LiNi 0.8 Co 0.1 Mn 0.1 O 2 increases from 64.6 to 90.59% after the 100th cycle at 1 C (1 C=200 mA g −1 ). Additionally, compared with the recycled materials, a thinner solid electrolyte interface (SEI) film was formed on the modified LiNi 0.8 Co 0.1 Mn 0.1 O 2 material. The improvement of the electrochemical performance for LiNi 0.8 Co 0.1 Mn 0.1 O 2 is mainly due to the existence of the Li 2 MoO 4 protective shell that improves the structural stability of the core material, avoids direct contact between the electrolyte and the active material, and suppresses the occurrence of side reaction.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Can Liao,Longfei Han,Xiaowei Mu,Yulu Zhu,Na Wu,Jingyi Lu,Yonghui Zhao,Xingjun Li,Yuan Hu,Yongchun Kan,Lei Song
Safety and high energy density have long restricted the large-scale practical application of lithium metal batteries because of the unbridled growth of lithium dendrites and the rapid deteriorating cycle performance of the LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode. Herein, an additive of RbNO3 with multiple functions is proposed for dendrite-free NCM811 lithium metal batteries. Benefiting from the electrostatic shielding effect formed by Rb+ during the Li+ deposition process and the solvation effect of NO3– to regulate lithium deposition, a high Coulombic efficiency of 95.02% (compared with the low Coulombic efficiency of 89.37% in the blank electrolyte) is acquired in Li//Cu cells, and the uniform growth of the lithium metal deposition with a large strawberry-like morphology is achieved. Moreover, when a cathode of NCM811 matches with a lithium metal anode, an extraordinary capacity retention of 93.67% after 200 cycles with a high Coulombic efficiency of 99.7% in the electrolyte with the RbNO3 system (a capacity retention of 80.1% with a Coulombic efficiency of 98.0% for the blank electrolyte) is achieved at 1C. This work provides guidance for the development of high-efficiency additives with dual synergistic regulation effects of anions and cations for lithium metal batteries in the future.
研究领域:
材料科学
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电化学
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电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Sen Jiang,Xin Xu,Junying Yin,Yue Lei,Xiaolan Wu,Yunfang Gao
Lithium metal batteries (LMBs) coupled with Ni-rich cathodes are promising next-generation solutions for high-energy-density energy storage devices. Nevertheless, many challenges concerning structural evolution of electrode materials as well as electrolyte decomposition, which mainly stem from a defect of the electrode–electrolyte interface (EEI) toward aggressive chemistries: Li metal anode (LMA), high nickel cathode materials, and LiPF6-based carbonate electrolytes, need to be addressed. In this work, the EEI layers on the LMA and LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode are tailored, and the hydrogen fluoride (HF) attack is eliminated by applying a multifunctional electrolyte additive allyltrimethylsilane (ATMS). Theoretical calculations and physicochemical characterizations reveal that the C═C and Si–C groups of ATMS can fulfill the bielectrode–electrolyte interphase regulation and HF capture, respectively. Consequently, by being incorporated with the ATMS additive, the Li/NCM811 battery delivers remarkably enhanced capacity retention of 82.9% with regard to the reference cell with the baseline electrolyte (46.4%) after 200 cycles, and the Li/Li cell exhibits a prolonged lifespan beyond 1000 h at 0.5 mA cm–2.
研究领域:
材料科学
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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
Bingyi Lu,Shihang Ma,Hongbin Feng
The rapid capacity fading of the Ni-rich cathode has become the main obstacle to its development. Generally, the coating method can be used for modification, which can effectively isolate side reactions and maintain the original structure. In this study, novel rare earth (La, Ho, Tm) polymetallic oxide (REPMO) coating is topologically prepared on the surface of LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) by using high speed shearing with reduction method. After modification, the high-rate capacity at 5 C enhanced a lot (100.3 mA h g −1 vs 31.2 mA h g −1 ) which is 3.2 times higher. This is because the Ni 2+ of the cathode could be changed into Ni 3+ to reduce the mixing of Li + /Ni 2+ and the structural stability has been improved. Moreover, the synergistic effect of REPMO coating can increase ionic conductivity , accelerate Li + diffusion rate and inhibit the phase transition, cation mixing and volume shrinkage. Our work provides an innovative idea at this moment for the selection and synthesis method of coating material for modification of cathode material .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Bo Xiao,Dongjia Li,Xinyi Dai,Yawei Wei,Yunchao Liao,Chao Wang,Fangli Ji,Fuzhong Wu
The low cycling stability of LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) is due to structural instability during lithium insertion and removal and strong surface reactivity, and it limits widespread application. In this study, a layer of LiCoPO 4 was coated on NCM811, and electrochemical tests showed that the material had excellent high-voltage electrochemical properties. The NCM811 sample coated with 1.0 wt% LiCoPO 4 (NCM-LCP1) had a capacity of 156.5 mAh g −1 after 100 cycles at 3–4.6 V and a retention rate of 87.47%. In contrast, the capacity of unmodified NCM811 was only 96.9 mAh g −1 , with a retention rate of 55.9%. An NCM-LCP1/graphite full cell demonstrated a capacity retention rate of 87.46% over 200 cycles at 3–4.3 V. By combining EIS and postcycle analyses, the stability and protection mechanism of the LiCoPO 4 layer under high voltage was confirmed. The LiCoPO 4 layer effectively prevented particle fragmentation and kept the structure stable. It also suppressed side reactions on the cathode surface. This work offers a new methodology for modifying NCM811 materials operated at 4.6 V.
研究领域:
材料科学
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电化学
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电池技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Jun Zhang,Haoyue Zhong,Chao Zheng,Yang Xia,Chu Liang,Hui Huang,Yongping Gan,Xinyong Tao,Wenkui Zhang
The synthesis of solid electrolytes with high ionic conductivity and the design of electrode interface with preferable compatibility are critical to realize the bulk-type application of all-solid-state batteries. In order to realize the superior electrochemical performance, argyrodite Li 6 PS 5 Cl is a promising solid electrolyte in all-solid-state batteries due to high ionic conductivity and electrochemical stability. Meanwhile, the solution reprecipitation is a valid process providing intimate ionic contact between electrodes and electrolytes to mitigate the interface incompatibility. Here, a wet-slurry process by dispersing active material (LiNi 0.8 Co 0.1 Mn 0.1 O 2 ), solid electrolyte (Li 6 PS 5 Cl), binder (ethyl cellulose) and conductive additives (carbon black) in anhydrous ethanol is developed to fabricate cathode. The effect of different contents of the binder in the composite cathodes on the electrochemical performance is investigated. The all-solid-state battery with a composite cathode containing 1 wt% of ethyl cellulose shows a reversible discharge capacity of 111.7 mAh g −1 at 30 °C and its capacity retention is approximately 89.7% after 100 cycles. This work demonstrates that the fast ion migration and stable interface between active particles and solid electrolyte enabled by optimum content of chemically compatible binder are critical to the electrochemical performance of all-solid-state lithium-ion batteries.
研究领域:
材料科学
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电化学
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能源存储
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固态离子学
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锂离子电池
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纳米复合材料
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界面工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yali Wang,Nanxi Dong,Bingxue Liu,Kexin Qi,Guofeng Tian,Shengli Qi,Dezhen Wu
The Ni-rich layered oxide cathode (LiNi 0.8 Co 0.1 Mn 0.1 O 2 , NCM811) suffers from serious interfacial side reactions and phase transition during high-voltage cycling (4.7 V), causing the poor rate capability and sharp capacity fading. Herein, a beneficial strategy is proposed, combining rigid/flexible chains, to exploit an endurable poly(imide-siloxane) (PIS) binder with transitable ion channel by structural tailoring and copolymerization. The in-situ formed nanoscale PIS layer on the NCM811 particle surface provides stern resistance to extreme conditions and strong attractive interactions, which enable a firm cathode-electrolyte interface and facile ion transfer path during charge-discharge process. The fabricated PIS-based cathodes under 4.3 V cutoff voltage exhibit higher capacity retention (83% vs. 69%, 1.0C, 500 cycles) and higher rate capacity (137.6 mAh g −1 vs. 123.6 mAh g −1 , 5.0C), in contrast to the cathodes with polyvinylidene fluoride (PVDF) binder. Further test under 4.7 V cutoff voltage indicates the rate capacity of PIS-based cathodes is superior than that of PVDF-based cathodes (163.2 mAh g −1 vs. 119.7 mAh g −1 , 5.0C), as well as superior capacity retention (74 % vs. 34%, 0.2C, 100 cycles). This work provides a valuable guideline for designing a polymer binder by focusing on stabilizing high-voltage cathode structure and facilitating ion diffusion.
研究领域:
材料科学
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电化学
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电池技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Shao-Lun Cui,Dan Feng,Zhen-Xue Xiao,Sheng Liu,Xue-Ping Gao,Guo-Ran Li
Ni-rich layered cathode materials are being paid much attention to because their high capacity can handily improve energy density of lithium-ion batteries. However, Ni-rich cathode materials still suffer from the deficiencies such as poor cycle stability, weak structural and thermal stability. In this work, Eu 2 O 3 -doped Li 4 SiO 4 with an enhanced ionic conductivity is proposed as surface coating layer for LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM) cathode material to improve the capacity retention and structural stability during cycling. The doping of Eu 2 O 3 in Li 4 SiO 4 makes the coating layer have higher ion conductivity and better stability than pure Li 4 SiO 4 layer. When the doping amount is 10 mol% of Li 4 SiO 4 , the corresponding cathode material NCM-LS3-0.10Eu 2 O 3 exhibits the optimal cycle and rate performance. The discharge specific capacity and capacity retention after 400 cycles at 1 C rate are 150.1 mAh g −1 and 80.48%, respectively. In particular, the NCM-LS3-0.10Eu 2 O 3 secondary particles avoid the appearance of serious cracks and maintain excellent structural stability even after long cycling. It is proved finally that the Eu 2 O 3 -doped Li 4 SiO 4 coating layer can not only inhibit the side reactions caused by the contact between electrode surface and electrolyte, but also reduce the resistance of lithium ion migration and suppress the microstructure changes caused by local stress.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2022
·Vol. 9
·期 6
·e202101628
·
IF 4.782
Cheng Chen,Xiaodan Yan,Lingzhi Zhang
Graphical A new disiloxane compound with tertiary amine and dioxaborolane groups, N , N -dimethyl-2-(3-(1,1,3,3-tetramethyl-3-(3-(2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)ethoxy)propyl)disiloxanyl)propoxy)ethan-1-amine (TMBDSA) is synthesized as bifunctional electrolyte additive for improving the cycling stability of nickel-rich LiNi 0.8 Co 0.1 Mn 0.1 O 2 . The LiNi 0.8 Co 0.1 Mn 0.1 O 2 /graphite cells with TMBDSA in the baseline electrolyte exhibit significantly improved electrochemical performances including rate capability and cycling stability even at an elevated temperature of 55 °C. A new disiloxane compound with tertiary amine and dioxaborolane group, N , N -dimethyl-2-(3-(1,1,3,3-tetramethyl-3-(3-(2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)ethoxy)propyl)disiloxanyl)propoxy)ethan-1-amine (TMBDSA), is designed and synthesized as functional electrolyte additive for improving the cycling stability of high-capacity nickel-rich LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811). The NCM811/graphite full cell test shows that the cycling stability is considerably improved by adding TMBDSA (0.2 wt.%) in the baseline electrolyte, retaining 88 % of initial capacity as compared with 71 % for the cell with the baseline electrolyte at 1 C after 200 cycles. Even at a high rate of 10 C, the cell with TMBDSA delivers a high capacity of 140.2 mAh/g and outstanding cycling stability at high temperatures of 55 °C. The surface analysis and density functional theory calculation reveal that TMBDSA is oxidized prior to the carbonate components in the electrolyte to form a protective interphase layer on the cathode surface. In addition, TMBDSA can significantly suppress the hydrolysis of LiPF 6 and the dissolution of transition metal ions (Ni, Co, and Mn) owing to the acid scavenging function of tertiary amine moiety. All the results demonstrate that TMBDSA can be potentially used as an efficient electrolyte additive for improving the cycling life of high energy density lithium-ion batteries using nickel-rich NCM811 cathode.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2019
·
IF 5.162
Xuelei Li,Liubing Jin,Dawei Song,Hongzhou Zhang,Xixi Shi,Zhenyu Wang,Lianqi Zhang,Lingyun Zhu
In order to obtain high power density, energy density and safe energy storage lithium ion batteries (LIB) to meet growing demand for electronic products, oxide cathodes have been widely explored in all-solid-state lithium batteries (ASSLB) using sulfide solid electrolyte. However, the electrochemical performances are still not satisfactory, due to the high interfacial resistance caused by severe interfacial instability between sulfide solid electrolyte and oxide cathode, especially Ni-rich oxide cathodes, in charge-discharge process. Ni-rich LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) material at present is one of the most key cathode candidates to achieve the high energy density up to 300 Wh kg −1 in liquid LIB, but rarely investigated in ASSLB using sulfide electrolyte. To design the stable interface between NCM811 and sulfide electrolyte should be extremely necessary. In this work, in view of our previous work, LiNbO 3 coating with about 1 wt% content is adopted to improve the interfacial stability and the electrochemical performances of NCM811 cathode in ASSLB using Li 10 GeP 2 S 12 solid electrolyte. Consequently, LiNbO 3 -coated NCM811 cathode displays the higher discharge capacity and rate performance than the reported oxide electrodes in ASSLB using sulfide solid electrolyte to our knowledge.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yue Lei,Xin Xu,Junying Yin,Jianping Xu,Kang Xi,Lai Wei,Haihua Wu,Sen Jiang,Yunfang Gao
Commercial Li-ion batteries use LiPF6-based carbonate electrolytes extensively, but there are many challenges associated with them, like dendritic Li growth and electrolyte decomposition, while supporting the aggressive chemical and electrochemical reactivity of lithium metal batteries (LMBs). This work proposes 1,1,1,3,3,3-hexafluoroisopropyl methacrylate (HFM) as a multifunctional electrolyte additive, constructing protective solid-/cathode-electrolyte interphases (SEI/CEI) on the surfaces for both lithium metal anode (LMA) and Ni-rich cathode to solve these challenges simultaneously. The highly fluorinated group (−CF3) of the HFM molecule contributes to the construction of SEI/CEI films rich in LiF that offer excellent electronic insulation, high mechanical strength, and surface energy. Accordingly, the HFM-derived LiF-rich interphases can minimize the electrolyte–electrode parasitic reactions and promote uniform Li deposition. Also, the problems of LiNi0.8Co0.1Mn0.1O2 particles’ inner microcrack evolution and the growth of dendritic Li are adequately addressed. Consequently, the HFM additive enables a Li/LiNi0.8Co0.1Mn0.1O2 cell with higher capacity retention after 200 cycles at 1 C than the cell with no additive (74.7 vs 52.8%), as well as a better rate performance, especially at 9 C. Furthermore, at 0.5/0.5 mAh cm–2, the Li/Li symmetrical battery displays supersteadfast cyclic performance beyond 500 h when HFM is present. For high-performance LMBs, the HFM additive offers a straightforward, cost-effective route.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Lijie Zhai,Mengting Lv,Mengmeng Cong,Tao Lin,Nan Meng,Fang Lian,Huiping Shao
The LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM) electrodes are successfully prepared by 3D gel printing (3DGP) technique in this study. The results show that when the slurry with 45 % solid content was squeezed out of the needle, the viscosity of the printing slurry was 1.54 Pa s at the shear rate of 660 s −1 , which shows that the printing slurries are suitable for 3DGP. At the same time, when the inner diameter of the printing needle is 0.25 mm, the air pressure is 0.40 MPa and the printing speed is 4.60 mm s −1 , the structure of printing electrode is complete. The electrochemical measurement results show the printed NCM electrode with 231 μm printing line spacing has a higher capacity of 169.80 mAh g −1 at 4C, a specific capacity of 103.9 mAh g −1 at 1C after 500 cycles and an energy density of 232 Wh kg −1 , which shows that the high specific capacity and good cycling stability exhibited by NCM electrodes fabricated by 3DGP.
研究领域:
材料科学
·
电化学
·
能源存储
·
增材制造
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）