首页|Thermodynamic equilibrium theory-guided design and synthesis of Mg-doped LiFe0.4Mn0.6PO4/C cathode for lithium-ion batteries

Thermodynamic equilibrium theory-guided design and synthesis of Mg-doped LiFe0.4Mn0.6PO4/C cathode for lithium-ion batteries

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Mn-rich LiFe1-xMnxPO4(x＞0.5),which combines the high operation voltage of LiMnPO4 with excellent rate performance of LiFePO4,is hindered by its sluggish kinetic properties.Herein,thermodynamic equi-librium analysis of Mn2+-Fe2+-Mg2+-C2O4--H2O system is used to guide the design and preparation of in-situ Mg-doped(Fe0.4Mn0.6)1-xMgxC2O4 intermediate,which is then employed as an innovative precursor to synthesize high-performance Mg-doped LiFe0.4Mn0.6PO4.It indicates that the metal ions with a high precipitation efficiency and the stoichiometric precursors with uniform element distribution can be achieved under the optimized thermodynamic conditions.Meanwhile,accelerated Li+diffusivity and reduced charge transfer resistance originating from Mg doping are verified by various kinetic character-izations.Benefiting from the contributions of inherited homogeneous element distribution,small particle size,uniform carbon layer coating,enhanced Li+migration ability and structural stability induced by Mg doping,the Li(Fe0.4Mn0.6)0.97Mg0.03PO4/C exhibits splendid electrochemical performance.

(Fe0.4Mn0.6)1-xMgxC2O4 precursorsThermodynamic equilibriumCo-precipitationMg dopingLithium-ion batteries

Wei Lyu、Wenlong Cai、Tuan Wang、Xiaobo Sun、Enhao Xu、Jinxuan Chen、Kaipeng Wu、Yun Zhang

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College of Materials Science and Engineering,Sichuan University,Chengdu 610064,Sichuan,China

国家自然科学基金中国博士后科学基金四川省科技计划中央高校基本科研业务费专项中央高校基本科研业务费专项中央高校基本科研业务费专项中央高校基本科研业务费专项中央高校基本科研业务费专项Hohhot Science and Technology Program

519042502021M6922542022YFG00982021CDSN-022022SCU120022022CDZG-172022CDSN-082022CDZG-92023-JieBangGuaShuai-Gao-3

2024

10.1016/j.jechem.2023.12.016

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.91(4)
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