新型锂离子电池循环稳定负极材料尖晶石型高熵氧化物(Cr_(0.2)Fe_(0.2)Mn_(0.2)Ni_(0.2)Co_(0.2))_(3)O_(4)/rGO

Novel Lithium-Ion Battery Cycle-Stabilized Anode Material Spinel-Type High Entropy Oxide(Cr_(0.2)Fe_(0.2)Mn_(0.2)Ni_(0.2)Co_(0.2))_(3)O_(4)/rGO

过渡金属氧化物因其理论比容量高、安全性能好,有望成为下一代锂离子电池的负极材料。但循环过程中体积变化较大、电导率较低,导致其循环性能和倍率性能较差,限制了其应用。为此,采用溶剂热法辅助热处理合成了高熵氧化物(HEO)并均匀分散于还原氧化石墨烯(rGO)载体上,将其用作锂离子电池负极材料。高熵氧化物具有较高的构型熵,有助于提高电极的循环稳定性,同时HEO/rGO复合材料大的比表面积保证了电解液的充分浸润,提高了反应速率,抑制了电极材料的团聚和体积膨胀,大大提高了电极材料的稳定性。电化学测试结果表明HEO/rGO电极在100 mA·g^(-1)的电流密度下循环100次仍然有653.8 mA·h·g^(-1)的比容量,表现出了良好的循环稳定性。因此,HEO/rGO复合材料被认为是一种极具开发潜力的锂离子电池负极材料。

Transition metal oxide is expected to be the anode material for next-generation lithiumion batteries due to its high theoretical specific capacity and good safety performance.However,due to the large volume change and low conductivity in the cycle process,its cycle performance and rate performance are poor,which limits its application.Therefore,high entropy oxide(HEO)was synthesized by solvothermal method assisted heat treatment and uniformly dispersed on reduced graphene oxide(rGO)carriers,and used as anode material for lithium-ion batteries.The high entropy oxide has higher configurational entropy,which is helpful to improve the cyclic stability of the electrode.Meanwhile,the large specific surface area of HEO/rGO composite ensures the full infiltration of electrolyte,improves the reaction rate,inhibits the agglomeration and the volume expansion of the electrode material,and greatly improves the stability of the electrode material.The electrochemical test results show that the specific capacity of the HEO/rGO electrode is 653.8 mA·h·g^(-1)after 100 cycles at a current density of 100 mA·g^(-1),showing good cycling stability.Therefore,the HEO/rGO composite is considered a highly promising anode material for lithium-ion batteries.