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Surface Doping vs.Bulk Doping of Cathode Materials for Lithium-Ion Batteries:A Review

Electrochemical Energy Reviews 2022年第4期5卷 254-285页

作者： Huaming Qian Haoqi Ren Ying Zhang Xianfeng He Wenbin Li Jingjing Wang Junhua Hu Hong Yang hirbod maleki kheimeh sari Yu Chen Xifei Li Xi’an Key Laboratory of New Energy Materials and Devices Institute of Advanced Electrochemical Energy and School of Materials Science and EngineeringXi’an University of TechnologyXi’an 710048ShaanxiChina Shaanxi International Joint Research Center of Surface Technology for Energy Storage Materials Xi’an 710048ShaanxiChina Department of Mechanical and Materials Engineering University of Western OntarioLondonOntario N6A 5B9Canada State Center for International Cooperation On Designer Low‑Carbon and Environmental Materials(CDLCEM) Zhengzhou University100 Kexue AvenueZhengzhou 450001China Xi’an Safty Energy Technology Co. LtdXi’an 710005ShaanxiChina

To address the capacity degradation,voltage fading,structural instability and adverse interface reactions in cathode materi-als of lithium-ion batteries(LIBs),numerous modification strategies have been developed,mainly including coating and doping.In particular,the important strategy of doping(surface doping and bulk doping)has been considered an effective strategy to modulate the crystal lattice structure of cathode materials.However,special insights into the mechanisms and effectiveness of the doping strategy,especially comparisons between surface doping and bulk doping in cathode materials,are still lacking.In this review,recent significant progress in surface doping and bulk doping strategies is demonstrated in detail by focusing on their inherent differences as well as effects on the structural stability,lithium-ion(Li-ion)diffusion and electrochemical properties of cathode materials from the following mechanistic insights:preventing the exposure of reactive Ni on the surface,stabilizing the Li slabs,mitigating the migration of transition metal(TM)ions,alleviating unde-sired structural transformations and adverse interface issues,enlarging the Li interslab spacing,forming three-dimensional(3D)Li-ion diffusion channels,and providing more active sites for the charge-transfer process.Moreover,insights into the correlation between the mechanisms of hybrid surface engineering strategies(doping and coating)and their influences on the electrochemical performance of cathode materials are provided by emphasizing the stabilization of the Li slabs,the enhancement of the surface chemical stability,and the alleviation of TM ion migration.Furthermore,the existing challenges and future perspectives in this promising field are indicated.

关键词： Lithium-ion batteries Cathode materials Surface doping Bulk doping Hybrid surface engineering Structural stability Lithium-ion diffusion

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Nitrogen/sulphur dual-doped hierarchical carbonaceous fibers boosting potassium-ion storage

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Journal of Energy Chemistry 2021年第4期30卷 420-427页

作者： Junzhi Li Junming Cao Xifei Li Junhua Hu Yaohui Zhang hirbod maleki kheimeh sari Chunxiao Lv IgorVZatovsky Wei Han Sino-Russian International Joint Laboratory for Clean Energy and Energy Conversion Technology College of PhysicsJilin UniversityChangchun 130012JilinChina Xi'an Key Laboratory of New Energy Materials and Devices Institute of Advanced Electrochemical Energy&School of Materials Science and EngineeringXi’an University of TechnologyXi’an 710048ShaanxiChina State Center for International Cooperation on Designer Low-carbon&Environmental Materials(CDLCEM) Zhengzhou UniversityZhengzhou 450001HenanChina School of Physics Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Collaborative Innovation Center for Marine Biomass Fibers Materials and Textiles of Shandong ProvinceSchool of Environmental Science and EngineeringQingdao UniversityQingdao 266071ShandongChina International Center of Future Science Jilin UniversityChangchun 130012JilinChina

The carbon materials as anode electrodes have been widely studied for potassium ion batteries(PIBs).However,the large size of potassium ions prevents their intercalation/deintercalation,resulting in poor storage behaviors.Herein,a novel design of N/S codoped hierarchical carbonaceous fibers(NSHCF)formed from nanosheets self-assembled by catalyzing Aspergillus niger with Sn is reported.The asprepared NSHCF at 600℃(NSHCF-600)exhibits a high reversible capacity of 345.4 m Ah g^(-1) at 0.1 A g^(-1) after 100 cycles and an excellent rate performance of 124.5 m Ah g^(-1) at 2 A g^(-1).The excellent potassium storage performance can be ascribed to the N/S dual-doping,which enlarges interlayer spacing(0.404 nm)and introduces more defects.The larger interlayer spacing and higher pyridinic N active sites can promote K ions diffusion and storage.In addition,the ex situ transmission electron microscopy reveals the high reversibility of potassiation/depotassiation process and structural stability.

关键词： Carbonaceous fibers Large interlayer spacing Nitrogen/sulphur dual-doping Potassium-ion batteries

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ZnO Interface Modified LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)Toward Boosting Lithium Storage

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Energy & Environmental Materials 2020年第4期3卷 522-528页

作者： Yunyan Li Xifei Li Junhua Hu Wen Liu hirbod maleki kheimeh sari Dejun Li Qian Sun Liang Kou Zhanyuan Tian Le Shao Cheng Zhang Jiujun Zhang Xueliang Sun Tianjin International Joint Research Center of Surface Technology for Energy Storage Materials Energy&Materials Engineering CenterCollege of Physics and Materials ScienceTianjin Normal UniversityTianjin 300387China Xi’an Key Laboratory of New Energy Materials and Devices Institute of Advanced Electrochemical Energy&School of Materials Science and EngineeringXi’an University of TechnologyXi’an 710048Shaanxi China State Center for International Cooperation on Designer Low-carbon&Environmental Materials(CDLCEM) Zhengzhou University100 Kexue AvenueZhengzhou 450001China Department of Mechanical and Materials Engineering University of Western OntarioLondonOntario N6A 5B9Canada Shaanxi Coal Chem Ind Technol Res Inst Co Ltd Xian Shaanxi 710070China Department of Chemistry College of Sciences/Institute for Sustainable EnergyShanghai UniversityShanghai 200444China

In this work,an amorphous ZnO was coated on LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM)using a sol-gel strategy method.The NCM coated with 1 wt.%Zn O and a thickness of about 3 nm exhibits an improved cycling performance,accompanied by a lower capacity fading(from 194.8 to 133.8 m Ah g^(-1),i.e.,68%)than that of the pristine one(i.e.,only 34%)after 300 cycles at 0.2 C.The cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS)indicate that the Zn O coating can improve extraction/insertion of Li+and inhibit the increase in impedance of the NCM cathode material.This approach may benefit the performance improvement of the Ni-rich cathode materials in Lithium-ion batteries(LIBs).

关键词： cathode materials LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2) lithium-ion batteries ZnO coating

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High-performance self-assembly MnCo2O4 nanosheets for asymmetric supercapacitors

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Journal of Energy Chemistry 2019年第10期28卷 66-72页

作者： Jianwei Li Dongbin Xiong Linzhe Wang maleki kheimeh sari hirbod Xifei Li Institute of Advanced Electrochemical Energy & School of Materials Science and Engineering Xi’an University of Technology

In this study,MnCo2O4 nanosheets were proposed to be utilized as an electrode material for supercapacitors.A two-step hydrothermal method with post-annealing treatment was employed in preparation of the nanostructures.MnCo2O4 electrode delivered a high specific capacitance of 2000 F g^-1 at 0.5 A g^-1,remarkable high-rate capability of 1150 F g^-1 at 20 A g^-1,and an excellent cycling stability of 92.3%at 5 A g^-1 after 5000 cycles.It is found that a three-electrode supercapacitor based on MnCo2O4 exhibits a promising electrochemical performance,better than the other similar materials,benefited from the synergistic effects of MnCo2O4 nanosheets.In fact,the self-assembly of nanosheets structure with high specific surface area and mesoporous structure can potentially enhance the electrochemical performance of supercapacitors.

关键词： High-performance Self-assembly MnCo2O4 nanosheets Asymmetric supercapacitors

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