ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Song-Yi Liao,Shuai-Fu Cui,Yue-Zhu Li,Wei-Xiang Cheng,Xing-Wen Huang,Jing Zhang,Ting-Ting Cui,Xu-Gang Shu,Yong-Gang Min
In this work, the wrinkled, flexible, and layered nitrogen-doped Ti 3 C 2 T x (shorten as N-MXene) is synthesized by using cyanamide as N-dopants. The changeable (002) plane spacing and the attached functional groups of N-MXene are detected by XRD and XPS analyses in details, respectively. The microscopic morphology of N-MXene is characterized by SEM and TEM, which demonstrates its wrinkled and flexible characteristics. When the wrinkled N-MXene being added into the LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) as conductive additive, the attained electrodes obtain enhanced electrochemical performances at the appropriate weight ratio (namely 2.5-N-MXene with 2.5 wt.%). The 2.5-N-MXene delivers “extra” capacity of 226.9 mAh/g at 0.1 C (20 mA/g) current density. The “extra” capacity is assigned to Li ions intercalation/extraction from the wrinkled/flexible/layered N-MXene. Moreover, based on the analyses of CV and dQ/dV curves, the wrinkled/flexible N-MXene additive could effectively inhibit the phase transition of M↔H2 of NCM811 and alleviate the volume change of the particles in the circulation. From DFT simulation, the N-MXene is more capable of preventing Ni/Co/Mn from dissolving and migrating to the negative electrode to form dendrites through adsorption. Therefore, the N-MXene should be a very competitive conductive agent to improve the mechanical and electrochemical properties of high nickel cathode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Guojun Zha,Yongping Luo,Naigen Hu,Chuying Ouyang,Haoqing Hou
Coating with FePO4 with the size of 20–30 nm on the surface of a LiNi0.8Co0.10Mn0.1O2 (NCM811) cathode produces an LFP3@NCM811 cathode via a sol–gel method, which markedly reduces secondary crystal cracking. A stable particle structure greatly improves the cycling stability of the LFP3@NCM811cathode, which retains 97% of its initial discharge capacity compared to NCM811 (78%) after 100 cycles at 2.7–4.5 V. Furthermore, it retains 86 and 63% of its initial discharge capacity after 400 cycles for LFP3@NCM811 and NCM811, respectively. The initial discharge capacity of the LFP3@NCM811 cathode is 218.8 mAh g–1 at 0.1 C, and the discharge capacity of the LFP3@NCM811 cathode is achieved to be 151.4 mAh g–1 at 5 C, which is 15 mAh g–1 higher than that of the NCM811 cathode. These are due to the reduction of cation mixing for a certain amount of Fe2+/Fe3+ or PO43– doped into the NCM811 surface, and the yolk–shell structure formed by coating with FePO4 helps improve the electronic conductivity and accelerate the Li+ transport. The cycling stability is mainly due to the secondary cleavage inhibition, which maintains the structural integrity of the cathode particles during the long cycle process and protects the inside of the particle from harmful electrolytes.
研究领域:
材料科学
·
电化学
·
储能技术
·
锂离子电池
·
纳米材料
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Haijia Li,Xueyi Zeng,Xin He,Wenlian Wang,Weizhen Fan,Chaojun Fan,Zhen Ma,Junmin Nan
A sulfur-containing compound S-phenyl Benzenethiosulfonate (SPBS) is developed as an electrolyte additive to improve the electrochemical performance of LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811)/graphite lithium-ion batteries (LIBs) in a wide temperature range. Compared with the batteries without SPBS, the capacity retention of the batteries containing SPBS increases from 58.15% to 91.48% after 1100 cycles at 25 °C and from 70.09% to 80.68% after 550 cycles at 45 °C. And after stored at 60 °C for 7 days, 14 days, and 28 days, the capacity retention rate and capacity recovery rate of the batteries containing SPBS are obviously improved. In addition, it is also shown that SPBS can inhibit the internal polarization and capacity attenuation of the batteries during low-temperature cycling, the capacity retention of the batteries containing SPBS increases from 46.3% to 81.9% after 100 cycles at −10 °C. The experimental and theoretical results demonstrate that SPBS facilitates the construction of high-quality electrode-electrolyte interfaces, reduces the electrolyte decomposition and inhibits the impedance increase. The excellent temperature performance of NCM811/graphite LIBs means the promising application prospect of SPBS-containing electrolyte.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materiomics
·
2023
·
IF 9.4
Xiao Chen,Yinda Li,Yunhao Lu,Jian Xie,Cheng Huang,Xiongwen Xu,Jian Tu,Xinbing Zhao,Tiejun Zhu
LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) is considered as a promising cathode for high-energy-density solid-sate Li metal battery for its high theoretical capacity. However, the high oxidizability and structural instability during charge limit its practical applications. In this work, 1% (in mass) of nanosized Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) was coated on NCM811 to enhance its electrochemical stability with a ceramic/polymer composite electrolyte. A robust, ultrathin (11 μm) composite electrolyte film was prepared by combining poly(vinylidene fluoride) (PVDF) with polyethylene oxide (PEO)-Li 6.5 La 3 Zr 1.5 Ta 0.5 O 12 (LLZTO). An in-situ polymerization process was used to enhance the interface between the PVDF/PEO-LLZTO (PPL) composite electrolyte and the LATP-coated NCM811 (LATP-NCM811). Coin-type Li|LATP-NCM811 cell with the PPL electrolyte exhibits stable cycling with an 81% capacity retention after 100 cycles at 0.5 C. Pouch-type cell was also fabricated, which can be stably cycled for 70 cycles at 0.5 C/1.0 C (80% retention), and withstand abuse tests of bending, cutting and nail penetration. This work provides an applicable method to fabricate solid-state Li metal batteries with high performance.
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
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Guangchang Yang,Kai Pan,Zhixiong Yan,Shenglong Yang,Fan Peng,Jingyao Liang,Feiyan Lai,Hongqiang Wang,Xiaohui Zhang,Qingyu Li
Surface coating is an effective strategy to suppress side reactions at the electrode/electrolyte interface and improve cycling stability of the Ni-rich LiNi x Co y Mn 1- x - y O 2 electrodes. It is difficult to prepare a complete coating layer on the secondary particles by traditional methods, due to the alkaline substances and oxidative property on surface. In this work, a coating process of Mg 3 B 2 O 6 running counter to traditional routes was designed to modify LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode material. In a weak polar ethanol medium, BH 4 - ions are uniformly lain on particle surface by the interaction between its electronegativity and oxidizing surface, which also change the charge state into negative atmosphere around the NCM811 surface. Then Mg 2+ ions are also completely dispersed by the mutual attraction between metal cations and the hydrolyzed BO 3 - . Then a full surface coverage of Mg 3 B 2 O 6 was prepared in situ on the NCM811 secondary particles. The complete coating layer protects the surface crystal structure of the NCM811 and limits the irreversible phase transition. The optimized composite with a suitable coverage of 1 % Mg 3 B 2 O 6 exhibits enhanced rate capability and excellent cycling performance. At a high current density of 10C, it delivers a specific capacity of 162.7 mAh g −1 . Especially, it maintains 160.6 mAh g −1 after 400 cycles at a high cut-off voltage of 4.5 V at 1C with a retention of 80.3 %. In addition, Mg 3 B 2 O 6 is a non-toxic and non-polluting material. The simple coating process with low-cost raw materials as well as mild operating conditions endow this technology with potential practical application value.
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 ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 4
·2529-2538
·
IF 1.774
Zhang Pengfei,Liu Yanxia,Chai Fengtao,Fan Yameng,Hou Aolin
Li 4 Ti 5 O 12 (LTO) composites modified with carbon nanotubes (CNTs) and carbon coating (LTO@C/CNTs) were synthesized by a simple solid-state reaction. The carbon-coated layers reduce the growth of the primary particles, inhibit interface side reactions and increase electron conductivity, so CNTs-modified LTO can form a conductive network and improve the diffusion path of lithium ions. The LTO@C/CNTs composites show a high-rate capability (150 mAh g −1 at 10 C, 145 mAh g −1 at 20 C) with good cycling performance (90.1% and 82.8% capacity retentions after 1000 cycles at 10 C and 20 C, respectively). In addition, superior electrochemical performance is also demonstrated in a full cell with a LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode and LTO@C/CNTs anode (97.1% capacity retentions after 200 cycles at 1 C). The carbon coating and CNTs-modified in LTO can reduce the polarization of potential difference and charge-transfer resistance, improve the diffusion coefficient of lithium ions, and lead to high rate performance and cycle stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SusMat
·
2024
·
IF 18.7
Tianyi Wang,Yimeng Zhang,Xueyan Huang,Peifeng Su,Min Xiao,Shuanjin Wang,Sheng Huang,Dongmei Han,Yuezhong Meng
Practical high-voltage lithium metal batteries hold promise for high energy density applications, but face stability challenges in electrolytes for both 4 V-class cathodes and lithium anode. To address this, we delve into the positive impacts of two crucial moieties in electrolyte chemistry: fluorine atom (-F) and cyano group (-CN) on the electrochemical performance of polyether electrolytes and lithium metal batteries. Cyano-bearing polyether electrolytes possess strong solvation, accelerating Li + desolvation with minimal SEI impact. Fluorinated polyether electrolytes possess weak solvation, and stabilize the lithium anode via preferential decomposition of F-segment, exhibiting nearly 6000-h stable cycling of lithium symmetric cell. Furthermore, the electron-withdrawing properties of -F and -CN groups significantly bolster the high-voltage tolerance of copolymer electrolyte, extending its operational range up to 5 V. This advancement enables the development of 4 V-class lithium metal batteries compatible with various cathodes, including 4.45 V LiCoO 2 , 4.5 V LiNi 0.8 Co 0.1 Mn 0.1 O 2 , and 4.2 V LiNi 0.5 Co 0.2 Mn 0.3 O 2 . These findings provide insights into design principles centered around polymer components for high-performance polymer electrolytes.
研究领域:
材料科学
·
电化学
·
电池技术
·
聚合物化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-13
·
IF 16.6
Zhang Guangzhao,Chang Jian,Wang Liguang,Li Jiawei,Wang Chaoyang,Wang Ruo,Shi Guoli,Yu Kai,Huang Wei,Zheng Honghe,Wu Tianpin,Deng Yonghong,Lu Jun
The electrochemical stability window of the electrolyte solution limits the energy content of non-aqueous lithium metal batteries. In particular, although electrolytes comprising fluorinated solvents show good oxidation stability against high-voltage positive electrode active materials such as LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811), the ionic conductivity is adversely affected and, thus, the battery cycling performance at high current rates and low temperatures. To address these issues, here we report the design and synthesis of a monofluoride ether as an electrolyte solvent with Li-F and Li-O tridentate coordination chemistries. The monofluoro substituent (-CH 2 F) in the solvent molecule, differently from the difluoro (-CHF 2 ) and trifluoro (-CF 3 ) counterparts, improves the electrolyte ionic conductivity without narrowing the oxidation stability. Indeed, the electrolyte solution with the monofluoride ether solvent demonstrates good compatibility with positive and negative electrodes in a wide range of temperatures (i.e., from −60 °C to +60 °C) and at high charge/discharge rates (e.g., at 17.5 mA cm −2 ). Using this electrolyte solution, we assemble and test a 320 mAh Li||NCM811 multi-layer pouch cell, which delivers a specific energy of 426 Wh kg −1 (based on the weight of the entire cell) and capacity retention of 80% after 200 cycles at 0.8/8 mA cm −2 charge/discharge rate and 30 °C.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano-Micro Letters
·
2022
·Vol. 14
·期 1
·1-13
·
IF 23.655
Jiang Meifang,Mu Pengzhou,Zhang Huanrui,Dong Tiantian,Tang Ben,Qiu Huayu,Chen Zhou,Cui Guanglei
The double-network binder shows excellent adhesive and self-healing abilities, which help suppress electrode volume expansion and stabilize the electrode interface upon cycling.
This binder induces a Li 3 N/LiF-rich solid electrolyte interface layer, which can suppress continuous electrolyte decomposition.
Superior electrochemical performance can be achieved in Si/Li half cells and LiNi 0.8 Co 0.1 Mn 0.1 O 2 /Si full cells, even with a high loading of Si electrode.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Qiwen Ran,Hongyuan Zhao,Youzuo Hu,Shuai Hao,Jintao Liu,Hao Li,Xingquan Liu
Achieving a highly stabilized surface structure is the key to successfully enhancing the cycling stability of LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM) cathode material for Li-ion batteries at high cut-off voltage (4.5 V). In this work, we report a highly surface-stabilized NCM material via a high-valent titanium ion (Ti 4+ )-induced nanostructured hybrid surface with a core-shell structure. Consequently, the Ti-modified LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode provides an excellent cycling stability with 92.3% capacity retention (100 cycles, 0.5C, 2.7–4.5 V). This proposed hybrid core-shell nanostructure prominently mitigates the surface structural degradations, continuous microcracking and parasitic reactions, effectively improving the surface structural stability . This efficient strategy provides a step towards further commercial application of the LiNi 0.8 Co 0.1 Mn 0.1 O 2 material and can be extended to other layered cathode materials.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米材料
·
锂离子电池
✓ 已验证
DOI
高影响因子
Nature Nanotechnology
·
2023
·Vol. 18
·期 6
·602-610
·
IF 38.3
Shi Peiran,Ma Jiabin,Liu Ming,Guo Shaoke,Huang Yanfei,Wang Shuwei,Zhang Lihan,Chen Likun,Yang Ke,Liu Xiaotong,Li Yuhang,An Xufei,Zhang Danfeng,Cheng Xing,Li Qidong,Lv Wei,Zhong Guiming,He Yan-Bing,Kang Feiyu
The ionic conductivity of composite solid-state electrolytes does not meet the application requirements of solid-state lithium (Li) metal batteries owing to the harsh space charge layer of different phases and low concentration of movable Li + . Herein, we propose a robust strategy for creating high-throughput Li + transport pathways by coupling the ceramic dielectric and electrolyte to overcome the low ionic conductivity challenge of composite solid-state electrolytes. A highly conductive and dielectric composite solid-state electrolyte is constructed by compositing the poly(vinylidene difluoride) matrix and the BaTiO 3 –Li 0.33 La 0.56 TiO 3– x nanowires with a side-by-side heterojunction structure (PVBL). The polarized dielectric BaTiO 3 greatly promotes the dissociation of Li salt to produce more movable Li + , which locally and spontaneously transfers across the interface to coupled Li 0.33 La 0.56 TiO 3– x for highly efficient transport. The BaTiO 3 –Li 0.33 La 0.56 TiO 3– x effectively restrains the formation of the space charge layer with poly(vinylidene difluoride). These coupling effects contribute to a quite high ionic conductivity (8.2 × 10 −4 S cm −1 ) and lithium transference number (0.57) of the PVBL at 25 °C. The PVBL also homogenizes the interfacial electric field with electrodes. The LiNi 0.8 Co 0.1 Mn 0.1 O 2 /PVBL/Li solid-state batteries stably cycle 1,500 times at a current density of 180 mA g − 1 , and pouch batteries also exhibit an excellent electrochemical and safety performance.
研究领域:
材料科学
·
电化学
·
电池技术
·
固态电解质
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Zhaoxin Lu,Zhenlian Chen,Muqin Wang,Yi Wan,Jingkun Yan,Shuaishuai Chen,Yan Shen,Zhao Yan,Deyu Wang
Lithium aluminum titanium phosphate, abbreviated as LATP, is an important Li+ solid-state electrolyte thanks to its high ionic conductivity and good stability in the ambient atmosphere. Extensive efforts have been devoted to understanding its advanced electrochemical properties. However, the strategy to use it in practical cell is rarely available. In this work, we demonstrate LATP’s working behavior via LATP that is coated on a separator facing the cathode and anode, respectively, in both graphite|LiNi0.8Co0.1Mn0.1O2 and Li|LiNi0.8Co0.1Mn0.1O2 cells. With the LATP contact with LiNi0.8Co0.1Mn0.1O2, the cells deliver slightly lower reversible capacity owing to a large Li+ diffusion impedance originated from the space charge layer formed between LATP and cathode and show better durability due to the synergetic Li+ transportation via LATP and organic electrolyte. As for LATP facing graphite, the cells deliver a higher discharge capacity and better cyclic stability. It is ascribed to the buffering and protecting effect of the solid electrolyte interphase (SEI) that reduces the interfacial impedance and precludes the interfacial reaction between LATP and lithiated graphite. When directly in contact with lithium, LATP is decomposed quickly and the cells’ performance varies with the recipe of organic electrolytes. This work clearly indicated that LATP could improve the cells’ performance when appropriate technologies are utilized to address the associated challenges.
研究领域:
材料科学
·
电化学
·
电池技术
·
固态电解质
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）