Effect of magnesium doping on properties of lithium-rich layered oxide cathodes based on a one-step co-precipitation strategy

Yu, Ruizhi; Wang, Xianyou; Fu, Yanqing; Wang, Lianwu; Cai, Siyu; Liu, Meihong; Lü, Bing; Wang, Gang; Wang, Di; Ren, Qifang; Yang, Xiukang

doi:10.1039/c6ta00370b

Cited by 120 publications

(72 citation statements)

References 63 publications

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“…Techniques based more on solid state physics are also very popular. Lattice substitution for Al, Mg, Ti among other elements can help to prevent the phase changes, limiting voltage decay or improve the conductivity . Though scientifically insightful, most of the reported lab scale tests cannot be scaled to the commercial level.…”

Section: Next‐generation Li‐ion Battery Researchmentioning

confidence: 99%

30 Years of Lithium‐Ion Batteries

et al. 2018

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Over the past 30 years, significant commercial and academic progress has been made on Li-based battery technologies. From the early Li-metal anode iterations to the current commercial Li-ion batteries (LIBs), the story of the Li-based battery is full of breakthroughs and back tracing steps. This review will discuss the main roles of material science in the development of LIBs. As LIB research progresses and the materials of interest change, different emphases on the different subdisciplines of material science are placed. Early works on LIBs focus more on solid state physics whereas near the end of the 20th century, researchers began to focus more on the morphological aspects (surface coating, porosity, size, and shape) of electrode materials. While it is easy to point out which specific cathode and anode materials are currently good candidates for the next-generation of batteries, it is difficult to explain exactly why those are chosen. In this review, for the reader a complete developmental story of LIB should be clearly drawn, along with an explanation of the reasons responsible for the various technological shifts. The review will end with a statement of caution for the current modern battery research along with a brief discussion on beyond lithium-ion battery chemistries.

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Section: Next‐generation Li‐ion Battery Researchmentioning

confidence: 99%

30 Years of Lithium‐Ion Batteries

et al. 2018

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“…Figure (b) shows the distinct reduction peaks showing the corresponding redox couples of Ni 4+/3+/2+ and Co 4+/3+ (labeled 2) at about 3.7 V as well as Mn 4+/3+ at about 3.5 V (labeled 1) . Furthermore, there is an extra cathodic peak at about 2.75 V in the curve of the LNMC‐C sample, which corresponds to the Li + intercalation/de‐intercalation process of the spinel structure . The dQ/dV curves at different cycles are given in Figures (c) and (d).…”

Section: Resultsmentioning

confidence: 99%

A Layered Lithium‐Rich Li(Li_0.2Ni_0.15Mn_0.55Co_0.1)O₂ Cathode Material: Surface Phase Modification and Enhanced Electrochemical Properties for Lithium‐Ion Batteries

Zhang

Peng

et al. 2019

ChemElectroChem

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Layered lithium-rich oxides are recognized as promising cathode materials for lithium-ion batteries (LIBs), owing to their high-energy density, high voltage, high specific capacity, and low cost. However, it remains a critical challenge to realize the high capacity of layered lithium-rich oxides. Herein, we synthesize the Li-rich Li(Li 0.2 Ni 0.15 Mn 0.55 Co 0.1 )O 2 cathode material by using the sol-gel method and induced a spinel phase on its surface through carbonization-reduction engineering. The surface-modified sample exhibited both improved capacity and rate capabilities. The initial discharge capacity of the treated sample reached 279.6 mAh g À 1 at 0.1 C, which was 11 % higher when compared to the as-prepared sample (252.6 mAh g À 1 ). In addition, a discharge capacity of 239.4 and 235.9 mAh g À 1 after 100 cycles at 0.5 C and 1 C (1 C = 250 mAh g À 1 ) could be still obtained for the modified sample, respectively. The enhanced properties were attributed to the increased ionic conductivity through the formation of 3D diffusion paths and reduced structural transformation, owing to the spinel structure decoration on the surface.

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“…Therefore, the variation of lattice parameters and cation ordering obviously expose the incorporation of Mg 2+ and P 2 O 7 4− during sintering. The doped Mg 2+ in the crystal structure can acts as a pillar to expand the interplanar spacing . The decrease of cations mixing must be due to the strong binding energy between TM ions and P 2 O 7 4− which can fixes the TM in original position .…”

Section: Results and Discussmentioning

confidence: 99%

“…Surface coating can strengthen the cyclic stability by isolating the cathode material and electrolyte. Metal oxides (Al 2 O 3 ), metal phosphates (LiNiPO 4 ), and metal fluoride (AlF 3 ) are frequently used, and have been proved very effective to alleviate capacity fading by protecting the cathode surface from side reactions with electrolyte . As another frequently‐used way to improve performance, elements doping can play a positive role on the thermal and structural stability .…”

Section: Introductionmentioning

confidence: 99%

A Collaboration of Surface Protection and Bulk Doping for High‐performance Li‐rich Cathode Materials

Wang

Sun

et al. 2019

ChemistrySelect

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Li‐rich layered oxides (LLRO) are promising high energy‐density cathode, but always suffer from the oxygen loss in initial activation and gradual structure transformation during cycling, which leads to capacity degradation and potential decay. Here, we employ a simple strategy to achieve the collaboration of surface protection and bulk doping for improving the performance of Li‐rich material. Scanning electron microscope and transmission electron microscopy tests demonstrate that a nanoscale protective layer of magnesium pyrophosphate is uniformly coated on the Li‐rich material surface. X‐ray diffraction test indicates Mg2+ and P2O74− are incorporated into the crystal structure, which induces the larger lattice spacing and lower cation mixing. As a result, the resultant LLRO displays extremely high Coulombic efficiency of 91.8% and discharge capacity of 288.4 mAh g−1, showing prominent cycling stability of 89.2% after 200 cycles. Furthermore, our strategy also suppresses the attenuation of average voltage during cycling and the potential drop is only 0.56 mV per cycle from 25 th to 200 th cycle. The excellent electrochemical performance can be ascribed to the combined merits of surface protection and bulk doping. This strategy may provide some new insights into the design and synthesis of high‐performance electrode materials.

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Effect of magnesium doping on properties of lithium-rich layered oxide cathodes based on a one-step co-precipitation strategy

Abstract: A Mg-doped lithium-rich layered oxide material with a stable structure exhibits outstanding electrochemical properties for LIBs.

Cited by 120 publications

References 63 publications

30 Years of Lithium‐Ion Batteries

30 Years of Lithium‐Ion Batteries

A Layered Lithium‐Rich Li(Li_0.2Ni_0.15Mn_0.55Co_0.1)O₂ Cathode Material: Surface Phase Modification and Enhanced Electrochemical Properties for Lithium‐Ion Batteries

A Collaboration of Surface Protection and Bulk Doping for High‐performance Li‐rich Cathode Materials

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Effect of magnesium doping on properties of lithium-rich layered oxide cathodes based on a one-step co-precipitation strategy

Abstract: A Mg-doped lithium-rich layered oxide material with a stable structure exhibits outstanding electrochemical properties for LIBs.

Cited by 120 publications

References 63 publications

30 Years of Lithium‐Ion Batteries

30 Years of Lithium‐Ion Batteries

A Layered Lithium‐Rich Li(Li0.2Ni0.15Mn0.55Co0.1)O2 Cathode Material: Surface Phase Modification and Enhanced Electrochemical Properties for Lithium‐Ion Batteries

A Collaboration of Surface Protection and Bulk Doping for High‐performance Li‐rich Cathode Materials

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A Layered Lithium‐Rich Li(Li_0.2Ni_0.15Mn_0.55Co_0.1)O₂ Cathode Material: Surface Phase Modification and Enhanced Electrochemical Properties for Lithium‐Ion Batteries