Nickel-manganese binary layered oxides with high working potential and low cost are potential candidates for sodium-ion batteries,but their electrochemical properties are highly related to compositional diversity.Dive...Nickel-manganese binary layered oxides with high working potential and low cost are potential candidates for sodium-ion batteries,but their electrochemical properties are highly related to compositional diversity.Diverse composite materials with various phase structures of P3,P2/P3,P2,P2/O3,and P2/P3/O3 were synthesized by manipulating the sodium content and calcination conditions,leading to the construction of a synthetic phase diagram for Na_(x)Ni_(0.25)Mn_(0.75)O_(2)(0.45≤x≤1.1).Then,we compared the electrochemical characteristics and structural evolution during the desodiation/sodiation process of P2,P2/P3,P2/03,and P2/P3/O3-Na_(x)Ni_(0.25)Mn_(0.75)O_(2).Among them,P2/P3-Na0.75Ni0.25Mn0.75O2exhibits the best rate capability of 90.9 mA h g^(-1)at 5 C,with an initial discharge capacity of 142.62 mA h g^(-1)at 0.1 C and a capacity retention rate of 78.25%after 100 cycles at 1 C in the voltage range of 2-4.3 V.The observed superior sodium storage performance of P2/P3 hybrids compared to other composite phases can be attributed to the enhanced Na^(+)transfer dynamic,reduction of the Jahn-teller effect,and improved reaction reversibility induced by the synergistic effect of P2 and P3 phases.The systematic research and exploration of phases in Na_(x)Ni_(0.25)Mn_(0.75)O_(2)provide new sights into high-performance nickel-manganese binary layered oxide for sodium-ion batteries.展开更多
Sodium ion batteries(SIBs)are a promising alternative to lithium-ion batteries for large-scale energy storage due to their cost-effectiveness and enhanced safety.Layered transition metal oxides(LTMOs)represent one of ...Sodium ion batteries(SIBs)are a promising alternative to lithium-ion batteries for large-scale energy storage due to their cost-effectiveness and enhanced safety.Layered transition metal oxides(LTMOs)represent one of the most fascinating electrode materials owing to their superior specific capacity,environmental benignity,and facile synthesis.However,they are confronted with challenges,such as irreversible phase transition,structural instability,and insufficient battery performance.Notably,entropy engineering emerges as an effective strategy to mitigate the above issues in energy storage research.This strategy aims to achieve precise composition control and optimized structure-property relationships,thereby enabling LTMOs to overcome the aforementioned limitations.This review focuses on medium-and high-entropy oxides(MEOs and HEOs),highlighting their design principles,growth mechanisms,and applications in layered oxide cathodes for SIBs.Through an in-depth analysis of electrochemical performance,phase transition behavior,and disorder structure regulation,we provide comprehensive insights into the application prospects and optimization pathways of MEO/HEO materials in advanced SIBs.Current challenges are also discussed,offering valuable insights and perspectives to overcome the performance bottlenecks of SIBs and facilitate their large-scale deployment.展开更多
Microstructure engineering serves as a potent approach to counteract the mechanical deterioration of Ni-rich layered cathodes,stemming from anisotropic strain during Lit(de)intercalation.However,a pressing challenge p...Microstructure engineering serves as a potent approach to counteract the mechanical deterioration of Ni-rich layered cathodes,stemming from anisotropic strain during Lit(de)intercalation.However,a pressing challenge persists in devising a direct method for fabricating radially aligned cathodes utilizing oriented hydroxide precursors.In this study,we synthesized LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2) oxides boasting superior radially aligned,sizerefined primary particles through a combination of strategic precipitation regulation and lithiation tuning.Elongated primary particles,achieved by stepwise control of ammonia concentration and pH during particle growth,facilitate the formation of radially aligned hydroxide precursor particles.Leveraging the size-refined and radially aligned primary particles,our prepared LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2) cathode exhibits a high discharge capacity of 229 mAh g^(-1) at 0.05 C,alongside excellent cycle stability,retaining 93.3% capacity after 200 cycles at 0.5 C(30℃)in a half cell,and 86.4% capacity after 1000 cycles at 1 C(30℃)in a full cell.Revisiting the regulation from precursor to oxide underscores the significance of controlling primary particles to maximize size perpendicular to[001]and attain suitable size along[001]during precursor precipitation and high-temperature calcination,offering valuable insights for synthesizing high-performance Ni-rich cathodes.展开更多
基金supported by project from the National Natural Science Foundation of China(21805018)by the Sichuan Science and Technology Program(2022ZHCG0018,2023NSFSC0117,2023ZHCG0060)+1 种基金the Yibin Science and Technology Program(2022JB005)project funded by the China Postdoctoral Science Foundation(2022M722704)。
文摘Nickel-manganese binary layered oxides with high working potential and low cost are potential candidates for sodium-ion batteries,but their electrochemical properties are highly related to compositional diversity.Diverse composite materials with various phase structures of P3,P2/P3,P2,P2/O3,and P2/P3/O3 were synthesized by manipulating the sodium content and calcination conditions,leading to the construction of a synthetic phase diagram for Na_(x)Ni_(0.25)Mn_(0.75)O_(2)(0.45≤x≤1.1).Then,we compared the electrochemical characteristics and structural evolution during the desodiation/sodiation process of P2,P2/P3,P2/03,and P2/P3/O3-Na_(x)Ni_(0.25)Mn_(0.75)O_(2).Among them,P2/P3-Na0.75Ni0.25Mn0.75O2exhibits the best rate capability of 90.9 mA h g^(-1)at 5 C,with an initial discharge capacity of 142.62 mA h g^(-1)at 0.1 C and a capacity retention rate of 78.25%after 100 cycles at 1 C in the voltage range of 2-4.3 V.The observed superior sodium storage performance of P2/P3 hybrids compared to other composite phases can be attributed to the enhanced Na^(+)transfer dynamic,reduction of the Jahn-teller effect,and improved reaction reversibility induced by the synergistic effect of P2 and P3 phases.The systematic research and exploration of phases in Na_(x)Ni_(0.25)Mn_(0.75)O_(2)provide new sights into high-performance nickel-manganese binary layered oxide for sodium-ion batteries.
基金sponsored by the National Natural Science Foundation of China(No.22109010)the Beijing Nova Program,the Chongqing Outstanding Youth Fund(No.2022NSCQJQX3895)+3 种基金the Chongqing Talents Plan for Young Talents(No.CQYC202005032)the National Key R&D Program of China(No.2021YFC2902905)the Key Project of Chongqing Technology Innovation and Application Development(No.2022TIADDEX0024)N.L.acknowledges support from the Beijing Institute of Technology Research Fund Program for Young Scholars.
文摘Sodium ion batteries(SIBs)are a promising alternative to lithium-ion batteries for large-scale energy storage due to their cost-effectiveness and enhanced safety.Layered transition metal oxides(LTMOs)represent one of the most fascinating electrode materials owing to their superior specific capacity,environmental benignity,and facile synthesis.However,they are confronted with challenges,such as irreversible phase transition,structural instability,and insufficient battery performance.Notably,entropy engineering emerges as an effective strategy to mitigate the above issues in energy storage research.This strategy aims to achieve precise composition control and optimized structure-property relationships,thereby enabling LTMOs to overcome the aforementioned limitations.This review focuses on medium-and high-entropy oxides(MEOs and HEOs),highlighting their design principles,growth mechanisms,and applications in layered oxide cathodes for SIBs.Through an in-depth analysis of electrochemical performance,phase transition behavior,and disorder structure regulation,we provide comprehensive insights into the application prospects and optimization pathways of MEO/HEO materials in advanced SIBs.Current challenges are also discussed,offering valuable insights and perspectives to overcome the performance bottlenecks of SIBs and facilitate their large-scale deployment.
基金supported by project from the National Natural Science Foundation of China(21805018,22108218)by the Sichuan Science and Technology Program(2022ZHCG0018,2023NSFSC0117,2023ZHCG0060)+1 种基金the Yibin Science and Technology Program(2022JB005)project funded by the China Postdoctoral Science Foundation(2022M722704).
文摘Microstructure engineering serves as a potent approach to counteract the mechanical deterioration of Ni-rich layered cathodes,stemming from anisotropic strain during Lit(de)intercalation.However,a pressing challenge persists in devising a direct method for fabricating radially aligned cathodes utilizing oriented hydroxide precursors.In this study,we synthesized LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2) oxides boasting superior radially aligned,sizerefined primary particles through a combination of strategic precipitation regulation and lithiation tuning.Elongated primary particles,achieved by stepwise control of ammonia concentration and pH during particle growth,facilitate the formation of radially aligned hydroxide precursor particles.Leveraging the size-refined and radially aligned primary particles,our prepared LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2) cathode exhibits a high discharge capacity of 229 mAh g^(-1) at 0.05 C,alongside excellent cycle stability,retaining 93.3% capacity after 200 cycles at 0.5 C(30℃)in a half cell,and 86.4% capacity after 1000 cycles at 1 C(30℃)in a full cell.Revisiting the regulation from precursor to oxide underscores the significance of controlling primary particles to maximize size perpendicular to[001]and attain suitable size along[001]during precursor precipitation and high-temperature calcination,offering valuable insights for synthesizing high-performance Ni-rich cathodes.
