CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jingsheng Xu,Zhiyuan Wang,Runguo Zheng,Hongyu Sun,Yanguo Liu,Junhua You
Ni-rich cathodes especially with Ni content over 90 % are promising next-generation cathode materials for advanced high energy lithium − ion batteries. However, in comparison with Ni ≤ 80 % Ni-rich cathodes, these ultrahigh Ni-rich materials face more severe challenges in terms of harmful H2 − H3 phase transformations and structural degradation during cycling. Herein, we present a robust surface structure composted of defect-rich disordered structures and LiF/Li 2 SiO 3 coating for stabilizing the ultrahigh Ni-rich cathode LiNi 0.96 Co 0.03 Mn 0.01 O 2 (NCM96) by modification with (NH 4 ) 2 SiF 6 . The surface disordered structures including Li/TM mixing, spinel, and rock salt structure play a crucial role in inhibiting the irreversible H2-H3 phase transition and reducing lattice volume changes by lattice coherence effect. Moreover, the disordered surface in collaboration with the co-coating restrains the rapid growth of surface rock salt phase into the bulk, enhancing structural stability. The modified sample NSF-0.5 delivers a capacity of 238 mAh/g at 0.1C and maintains a capacity retention of 88.5 % at 0.5C after 100 cycles in half cell as well as 82.3 % at 1C after 300 cycles in full cell, significantly superior to the NCM96. The findings provide a simple and cost-effective surface modification strategy to enhance the structural stability and electrochemical performance of ultrahigh nickel cathodes for high-energy density LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
锂离子电池
·
固态化学
·
表面工程
·
电池材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Minghao Sun,Haoxiang Zhong,Shuren Jiao,Hanqi Shao,Lingzhi Zhang
Carboxymethyl chitosan (C-CTS) was firstly reported as a water soluble binder for LiFePO 4 cathode in Li-ion batteries. The electrochemical performances of LiFePO 4 cathode with C-CTS binder was investigated and compared with the conventional water-soluble sodium carboxymethyl cellulose (CMC) and the commercial non-aqueous polyvinylidene difluoride (PVDF). LiFePO 4 cathode with C-CTS exhibited a comparable cycling performance, but better rate capability than that of CMC and PVDF, retaining 65% capacity of C/5 at 5 C rate as compared with 55.9% and 39.4% for CMC and PVDF, respectively. In addition, LiFePO 4 cathode with C-CTS exhibited excellent cycling performance at 60 °C, retaining 91.8%/62.1% capacity after 80 cycles at 1 C/10 C, respectively.
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子化学
·
电池技术
✓ 已验证
DOI
高影响因子
SOLID STATE IONICS
·
2018
·
IF 2.751
Yuzhen Duan,Junming Guo,Mingwu Xiang,Jinyu Zhu,Changwei Su,Hongli Bai,Xiaofang Liu,Wei Bai,Rui Wang
A series of single crystalline spinel LiNi x Mn 2- x O 4 (0 ≤ x ≤ 0.10) cathode materials were synthesized in virtue of a facile solution-combustion approach. The morphology and the structure of all as-prepared samples were synthetically investigated with the X-ray diffraction (XRD), the scanning electron microscopy (SEM), the high-resolution transmission electron microscopy (HRTEM), and the X-ray photoelectron spectrometer (XPS). According to these investigation results, Ni-doping content has a significant impact on the control of morphology and crystalline structure, hence the as-prepared LiNi x Mn 2- x O 4 samples exhibit polyhedral morphology with high crystallinity and average size of 100–200 nm. This unique polyhedral crystal structure has numerous surfaces fitting the (111) crystalline orientation which exhibit the smallest Mn dissolution in electrolytes, whilst stabilizing the spinel framework. Owing to the merits of both single crystalline polyhedral structure and appropriate Ni-doping, the as-obtained LiNi x Mn 2- x O 4 cathodes reveal enhanced rate capability coupled with long cycling performance. In especial, the LiNi 0.08 Mn 1.92 O 4 presents a initial discharge capacity of 101.3 mAh/g and ultralong cycle stability up to 2000 cycles at 1C, whilst showing enhanced cycle performance when temperature increases to 55 °C. Excellent capacity retention of 72% and 63% is also obtained after 1000 cycles even at high current rate of 5C and 10C. This study may contribute to an effective candidate approach for the obvious improvement on lithium ion batteries in term of electrochemical activity.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
纳米材料
·
固态化学
·
电池技术
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Fei Xu,Hongtao Wang,Mengyi Wu,Jiangsai Nan,Ting Li,Shun-an Cao
Redox-active organic materials are potential cathode materials for material-sustainable and environment-friendly Li-ion batteries. As is one of the most prominent features for organic compounds, isomerism has a significant influence on their properties. Herein, we synthesize two isomeric pairs of poly(anthraquinonyl imide)s ( PAQI s) by a simple one-pot reaction, and investigate their electrochemical properties as Li-ion battery cathodes by cyclic voltammogram and galvanostatic discharge/charge cycling. The PAQI materials exhibit a high reversible capacity of 202 mAh g −1 and a stable cyclability with 80% capacity retention over 200 cycles, and a remarkable rate performance, suggesting a potential feasibility of these organic cathode materials for high-capacity Li-ion batteries. The discharge/charge potentials of these PAQI s are slightly lower than the monomers . A further comparison of these four PAQI s indicates the isomerism plays a significant role in the electrochemical performance of these organic electrode materials .
研究领域:
电化学
·
材料科学
·
能源存储
·
有机电极材料
·
锂离子电池
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 17
·7911-7920
·
IF 2.7
Pengchao Liang,Yuanchao Li,Xiangzhen Xiao,Shumin Fan,Jingjing Ma,Jingjie Liu,Yongqiang Dong,Yuhang Zong,Guangri Xu,Li Yang
Although they possess a high working voltage and environmental compatibility, and are low in cost with abundant resources, the poor cycling performance and rapid capacity attenuation of LiMn2O4 cathodes at high temperature restrict their extensive application. In this study, LiMn2O4 materials are synthesized by a simple rheology-assisted solid-phase method using citric acid as an additive. The citric acid improves the uniformity of the mixed raw materials, resulting in a reduction in particle agglomeration. Consequently, the synthesized LiMn2O4 shows an initial capacity of 117.4 mA h g−1 with a capacity retention of 79.50% at 2C after 300 cycles and 54.78% of the initial discharge capacity at 20C. This work provides a strategy for modifying multicomponent transition metal oxides for advanced lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机固体化学
·
电池技术
✓ 已验证
DOI
高影响因子
POWDER TECHNOLOGY
·
2019
·
IF 3.413
Shuzhen Yang,Yanfang Huang,Shengpeng Su,Guihong Han,Jiongtian Liu
A hybrid water-soluble humics-based binder (humics/sodium carboxymethyl cellulose (CMC)) was studied to enhance the electrochemical performance of a Li-ion battery cathode (LiFePO 4 ) in this work. Molecular dynamics simulations of binder active fractions with related materials (LiFePO 4 and Al) were performed to explore the binding mechanisms. Humics serve to connect the active material and provide a conducting bridge in the cathode. To improve the adhesion between the particles and current collector, CMC is added as an auxiliary fraction with a mass ratio of humics to CMC of 3:1. The scanning electron microscope results indicate that the morphology of the electrode with the hybrid humics/CMC binder is more uniform than that of electrodes with conventional polyvinylidene fluoride and CMC binders. The electrochemical performance and cycling stability of the cathode materials are obviously enhanced. The reversible specific capacity can reach 152.3 mAh g −1 at 0.5 °C after 100 cycles. The rate capability is greatly improved, with a specific capacity as high as 105 mAh g −1 at 8 °C. The humics/CMC composite can be regarded as a novel, environmentally friendly and high-efficiency binder for application in Li-ion batteries.
研究领域:
电化学
·
材料科学
·
能源存储
·
纳米材料
·
可持续能源技术
✓ 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
·
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 Technology
·
2018
·Vol. 6
·期 11
·2139-2145
·
IF 3.175
Wei Pan,Wenjie Peng,Guochun Yan,Huajun Guo,Zhixing Wang,Xinhai Li,Weihua Gui,Jiexi Wang,Ning Chen
This study focuses on suppressing the voltage decay and improving the electrochemical performance of Li-rich and manganese-based (LRM) material by Nb 2 O 5 coating, which is realized by an effective soft-chemical route using a mixture of ethanol and water as co-solvent. After Nb 2 O 5 coating, the resulted material demonstrates superior electrochemical performance as cathode material for LIBs. Particularly, it shows an excellent capacity retention of 98 % after 200 cycles at 1 C (1 C=250 mA g −1 ). Voltage decay within cycling is also obviously suppressed by Nb 2 O 5 coating. Moreover, it exhibits superior rate capacities, delivering 189 and 152 mAh g −1 at high current densities of 2 and 5 C, respectively. The improved electrochemical performance of Nb 2 O 5 coated sample can be attributed to that Nb 2 O 5 can suppress the phase transformation and voltage decay by acting as not only a fast ion conductor to accelerate the lithium ion diffusion at the cathode/electrolyte interface, but also an inert protective layer to reduce the direct contact between the cathode and electrolyte.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机非金属材料
·
固态离子学
✓ 已验证
DOI
高影响因子
IONICS
·
2023
·Vol. 30
·期 2
·749-757
·
IF 2.8
Cong Jun,Luo Shao-hua,Li Peng-yu,Li Kun,Wang Ya-feng,Yan Sheng-xue,Li Peng-wei,Chen Huan-huan
To realize the high value–added utilization of acid-washed iron red, in this paper, acid-washed iron red is used as raw material. Aiming at the problem of low conductivity of iron-based lithium ion batteries (LIBs) LiFePO 4 /C materials, different metal ions are doped in the iron position, and the microstructure and electrochemical properties of the obtained material are systematically studied. Here, LiFePO 4 /C is synthesized through simple carbothermal reduction method using acid-washed iron red as the iron source. On this basis, La (1%, 2%, 3%) doping modification is carried out. Then doped modification is performed on this basis, preferably 2% La-doped LiFePO 4 /C materials. The XRD patterns show that the diffraction peaks of the samples prepared at all doping amounts can be perfectly matched with the standard card ( PDF # 40–1499), and there is no impurity peak, all of which are pure phases. According to the refined data, it is clear that minor amount of La has successfully replaced the position of Fe and incorporated into the lattice. Electrochemical tests show that LiFe 0.98 La 0.02 PO 4 /C has the highest charge and discharge capacity of 146.5/138.2 mAh·g −1 in the first cycle at 0.5C, and the reversible specific capacity of 136.5 mAh·g −1 remains after 50 cycles. Furthermore, the first-principles calculations more strongly confirm that La doping can significantly improve the defects of low electronic conductivity of LiFePO 4 .
研究领域:
材料科学
·
电化学
·
能源存储
·
无机非金属材料
·
固态化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Peng Li,Lianyi Shao,Pengfei Wang,Xi Zheng,Haoxiang Yu,Shangshu Qian,Miao Shui,Nengbing Long,Jie Shu
In this work, Li 2 NaV 2 (PO 4 ) 3 is successfully synthesized by using a simple solid-state reaction method. Structural analysis shows that this sample is a hybrid product consisted of rhombohedral Li 3 V 2 (PO 4 ) 3 phase and rhombohedral Na 3 V 2 (PO 4 ) 3 phase As a cathode material for lithium ion batteries, Li 2 NaV 2 (PO 4 ) 3 exhibits an initial reversible capacity of 108.9 mAh g −1 at 35 mA g −1 in the potential range between 3.0 and 4.3 V, with an average working potential at 3.75 V. The lithium-ion diffusion coefficient in Li 2 NaV 2 (PO 4 ) 3 is measured to be 1.86–3.27 × 10 −15 cm 2 s −1 . In addition, the electrochemical reaction between Li 2 NaV 2 (PO 4 ) 3 and Li is also investigated by various in-situ and ex-situ techniques. Viewed from the in-situ and ex-situ results, it is concluded that the electrochemical reactions of Li 2 NaV 2 (PO 4 ) 3 with Li are associated with the formation of rhombohedral LiV 2 (PO 4 ) 3 phase and rhombohedral NaV 2 (PO 4 ) 3 phase during the lithium ion extraction process and its reverse lithium insertion process is reversible for structural evolution. The highly stable structure ensures the electrochemical reversibility of Li 2 NaV 2 (PO 4 ) 3 cathode material in lithium ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固体化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 46
·24579-24589
·
IF 11.301
Yongkang Han,Jinmei Xu,Wei Wang,Fu Long,Qunting Qu,Yan Wang,Honghe Zheng
Interfacial modification is one of the most important technologies to improve the overall electrochemical properties of Ni-rich cathodes. Herein, a novel strategy of in situ planting of an electrolyte film-forming additive on a single crystal NCM811 surface is proposed by consuming the residual lithium to develop a functional Al(Li)BOB nano-layer. Different from traditional physical coating, this approach cleverly consumed the undesirable residual lithium on the NCM811 surface. The in situ grown 30–50 nm Al(Li)BOB layer on the single crystal NCM811 cathode surface contributes to its much enhanced electrochemical performances. At a high operating voltage (charge voltage limit of 4.5 V vs. Li/Li+), the capacity retention is greatly increased from 57.0% to 83.5% after 295 cycles. Meanwhile, the incorporation of aluminum is effective in improving the thermal stability of the Ni-rich cathode. The novel interfacial strategy by in situ implanting of an electrolyte additive is of important significance for solving the critical interfacial issue for Ni-rich cathode materials.
研究领域:
材料科学
·
电化学
·
能源存储
·
锂离子电池
·
界面工程
·
纳米材料
·
固态化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Shi Wang,Qingyuan Li,Minglei Bai,Jixin He,Chongyang Liu,Zengxi Li,Xiangfeng Liu,Wen-yong Lai,Liaoyun Zhang
Lithium-ion batteries (LIBs) using solid-state electrolytes (SSEs) can improve safety and energy density comparable with the liquid electrolytes (LE)-based counterparts. Especially, employing garnet-type SSEs to prepare solid-state LIBs are promising to achieve high-energy cells. However, the unbending and brittle issues of the inorganic SSE films are not suitable to fabricate flexible and stretchable energy storage devices. Here, We find that introducing specific polymer (30 wt%) into Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 (LLZTO) can strongly increase the strength of the composite polymer-in-inorganic electrolyte (CIE) film. Both in-situ and ex-situ characterizations demonstrate that CIE delivers an excellent ability to suppress the growth of Li dendrites due to the close packing of LLZTO and effective filled grain boundaries and voids inside the CIE film by the polymer. The CIE inherits impressive electrochemical performance from LLZTO. As a result, the assembled LiFePO 4 (LFP)/CIE/Li cell delivers better cell performance than LFP/LE-separator/Li cell at ambient temperature (AT). The assembled high-voltage cathode (Li 1.2 Mn 0.6 Ni 0.2 O 2 , 4.8 V)/CIE/Li cell also displays an excellent cell performance at AT. The present study offers new insights into exploring of flexible polymer-in-ceramic electrolytes for high-voltage LIBs with improved safety and energy density .
研究领域:
材料科学
·
电化学
·
能源存储
·
固态电池
·
纳米复合材料
·
界面工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）