Designing advanced P3-type K0.45Ni0.1Co0.1Mn0.8O2 and improving electrochemical performance via Al/Mg doping as a new cathode Material for potassium-ion batteries

Dang, Rongbin; Li, Na; Yang, Yan‐Dong; Wu, Kang; Li, Qingyuan; Lee, Yu Lin; Liu, Xiangfeng; Hu, Zhongbo; Xiao, Xiaoling

doi:10.1016/j.jpowsour.2020.228190

Cited by 43 publications

(42 citation statements)

References 47 publications

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“…In other words, the entire electrochemical process is a single‐phase reaction and consistent with that reported previously for K 0.75 Mn 0.8 Ni 0.1 Fe 0.1 O 2 , P3‐K 0.45 Ni 0.1 Co 0.1 Mn 0.8 O 2 , and P3‐K 0.54 Mn 0.5 Co 0.5 O 2 . [ 31,43,46 ] Obviously, such simple single‐phase electrochemistry is beneficial for the cycle stability.…”

Section: Resultsmentioning

confidence: 99%

“…[29] At potentials higher than 2.7 V, the reversible oxidation/reduction peaks present at ~3.1 V are due to the Ni 2+ /Ni 3+ redox couple, while the peaks at ~3.8 V are due to the sequential oxidation of Co 3+ to Co 4+ . [30][31][32] Figure S3 depicts the first three galvanostatic charging/discharging curves at a current density of 20 mA g -1 . The initial voltage (vs. K/K + ) of the battery is about 2.75 V, and the first charge/discharge capacity is 49/106 mAh g -1 , suggesting about 0.2 mol K extraction and 0.43 mol K insertion in per formula unit in the cathode, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Yolk–Shell P3‐Type K_0.5[Mn_0.85Ni_0.1Co_0.05]O₂: A Low‐Cost Cathode for Potassium‐Ion Batteries

Hao

Xiong

Zhou

et al. 2021

Energy & Environ Materials

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Low‐cost preparation methods for cathodes with high capacity and long cycle life are crucial for commercializing potassium‐ion batteries (PIBs). Presently, the charging/discharging strain that develops in the active cathode material of PIBs causes cracks in the particles, leading to a sharp capacity fade. Here, to abate the strain release and the need for an industrially relevant process, a simple low‐cost co‐precipitation method for synthesizing yolk–shell P3‐type K0.5[Mn0.85Ni0.1Co0.05]O2 (YS‐KMNC) was reported. As cathode material for PIBs, the YS‐KMNC delivers a high reversible capacity (96 mAh g–1 at 20 mA g–1) and excellent cycle stability (80.5% retention over 400 cycles at a high current density of 200 mA g–1). More importantly, a full battery assembled with the YS‐KMNC cathode and a commercial graphite anode exhibits a high operating voltage (0.5‐3.4 V) and an excellent cycling performance (84.2% retention for 100 cycles at 100 mA g–1). Considering the low‐cost, simple production process and high performance of YS‐KMNC cathode, this work could pave the way for the commercial development of PIBs.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Yolk–Shell P3‐Type K_0.5[Mn_0.85Ni_0.1Co_0.05]O₂: A Low‐Cost Cathode for Potassium‐Ion Batteries

Hao

Xiong

Zhou

et al. 2021

Energy & Environ Materials

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“…Although elements such as Nb, [226] Y, [229] and Ta [228] improve the electrochemical c) the presence of microsphere and microcubic morphologies within the bulk material. [252] d) TEM image of K 0.48 Ni 0.2 Co 0.2 Mn 0.6 O 2 . The elemental distribution of K, Ni, Co, and Mn within e) microcubes and f) microspheres.…”

Section: Discussionmentioning

confidence: 99%

“…This value can be increased using a higher cut-off voltage, although at the expense of stability. Dang [252] The Al-and Mg-doped electrodes improve the capacity retention to 77.4% and 74.3%, respectively, with the Al-doped electrode facilitating the highest discharge capacity of 65.0 mAh g −1 . However, the first discharge capacity of 89.2 mAh g −1 for the pristine electrode is reduced to 80.8 and 84.5 mAh g −1 for the Mg-and Al-doped electrodes, respectively, likely due to the lower Mn 3+ content.…”

Section: Kni X Co Y Mn Z Omentioning

confidence: 99%

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Electrochemical Overview: A Summary of ACo_xMn_yNi_zO₂ and Metal Oxides as Versatile Cathode Materials for Metal‐Ion Batteries

Pimlott

Street

Down

et al. 2021

Adv Funct Materials

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Early LiCoO 2 research provided the basis for the tremendous commercial success of Li + batteries since their invention in the early 1990s. Today, LiN-iMnCoO 2 (Li-NMC) is one of the most widely used batteries in the rapidly evolving electronic vehicle industry. Li-NMC batteries continue to receive significant interest as research efforts aim to partially, or entirely, replace the use of scarcely available and toxic Co with elemental doping to form binary, ternary, and quaternary layered oxides. Furthermore, safety concerns and rising uncertainty for the future of Li supplies have resulted in growing curiosity toward non-Li + rechargeable batteries such as Na + and K + . Unfortunately, the success of Li + host materials does not always directly transfer to Na + and K + batteries due to the difficulty of reversibly intercalating larger ions without irreparably distorting the host structure. Consequently, this report provides an overview of the Li-based materials surrounding the success of commercial Li-NMC and the subsequent progress of their lesser studied Na and K counterparts. The challenges for current cathode materials are highlighted, and the opportunities for progression are suggested. The summary presented in this review can be consulted to steer new and unique research avenues for layered oxide materials as metal-ion battery cathodes.

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Suppressing the Jahn–Teller Effect in Mn‐Based Layered Oxide Cathode toward Long‐Life Potassium‐Ion Batteries

Xiao

Xia

et al. 2021

Adv Funct Materials

111

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Mn‐based layered oxides are one of the most appealing cathodes for potassium‐ion batteries (PIBs) because of their high theoretical capacity. However, the Jahn–Teller effect of Mn3+ induces detrimental structural disorder and irreversible phase transition, leading to inferior cycling stability. Herein, an efficient strategy to suppress the Jahn–Teller effect in Mn‐based layered oxides by regulating the Mn average valence is demonstrated. To verify this strategy, Ti4+ and Mg2+ ions are chosen and introduced into the layered oxides (K0.5Mn0.7Co0.2Fe0.1O2), which can enhance the structural stability but have opposite effects on the regulation of Mn3+/4+ valence. The K0.5Mn0.6Co0.2Fe0.1Mg0.1O2 with a higher Mn valence (4+) exhibits long‐term cycling stability as a PIB cathode compared to the K0.5Mn0.6Co0.2Fe0.1Ti0.1O2 with a lower Mn valence (3.667+). Meanwhile, the detrimental phase transition from P3 to O3 caused by Jahn–Teller effect is completely suppressed, and is replaced by a highly reversible single‐phase solid solution reaction for K0.5Mn0.6Co0.2Fe0.1Mg0.1O2. The enhanced cycling stability and single‐phase reaction are attributed to the suppressed Jahn–Teller effect via Mn valence regulation, confirmed by first‐principles calculations. Therefore, this discovery paves the way for the development of advanced layered cathodes for the next‐generation high‐performance PIBs.

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Designing advanced P3-type K0.45Ni0.1Co0.1Mn0.8O2 and improving electrochemical performance via Al/Mg doping as a new cathode Material for potassium-ion batteries

Cited by 43 publications

References 47 publications

Yolk–Shell P3‐Type K_0.5[Mn_0.85Ni_0.1Co_0.05]O₂: A Low‐Cost Cathode for Potassium‐Ion Batteries

Yolk–Shell P3‐Type K_0.5[Mn_0.85Ni_0.1Co_0.05]O₂: A Low‐Cost Cathode for Potassium‐Ion Batteries

Electrochemical Overview: A Summary of ACo_xMn_yNi_zO₂ and Metal Oxides as Versatile Cathode Materials for Metal‐Ion Batteries

Suppressing the Jahn–Teller Effect in Mn‐Based Layered Oxide Cathode toward Long‐Life Potassium‐Ion Batteries

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Designing advanced P3-type K0.45Ni0.1Co0.1Mn0.8O2 and improving electrochemical performance via Al/Mg doping as a new cathode Material for potassium-ion batteries

Cited by 43 publications

References 47 publications

Yolk–Shell P3‐Type K0.5[Mn0.85Ni0.1Co0.05]O2: A Low‐Cost Cathode for Potassium‐Ion Batteries

Yolk–Shell P3‐Type K0.5[Mn0.85Ni0.1Co0.05]O2: A Low‐Cost Cathode for Potassium‐Ion Batteries

Electrochemical Overview: A Summary of ACoxMnyNizO2 and Metal Oxides as Versatile Cathode Materials for Metal‐Ion Batteries

Suppressing the Jahn–Teller Effect in Mn‐Based Layered Oxide Cathode toward Long‐Life Potassium‐Ion Batteries

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Yolk–Shell P3‐Type K_0.5[Mn_0.85Ni_0.1Co_0.05]O₂: A Low‐Cost Cathode for Potassium‐Ion Batteries

Yolk–Shell P3‐Type K_0.5[Mn_0.85Ni_0.1Co_0.05]O₂: A Low‐Cost Cathode for Potassium‐Ion Batteries

Electrochemical Overview: A Summary of ACo_xMn_yNi_zO₂ and Metal Oxides as Versatile Cathode Materials for Metal‐Ion Batteries