【摘要】 以5 V高电压LiNi_0.5Mn_1.5O₄为正极材料,高安全性Li₄Ti₅O₁₂为负极材料制备了LiNi_0.5Mn_1.5O₄/Li₄Ti₅O₁₂全电池,重点研究了正负极容量配比对电池电化学性能的影响。其中正极容量过量40%的电池具有最好的倍率和循环性能,在0.5 C电流下,P/N=1.4的电池的最高放电比容量为164.1 m Ah·g^-1,循环200次的容量保持率为88%;在2 C电流下,P/N=1.4的电池的最高放电比容量为135.2 m Ah·g^-1,循环740次的容量保持率为91.1%。P/N=1.4的电池良好的倍率和循环性能与其内阻较小、电池极化较小等因素有关。更多还原

【Abstract】 Full cells of LiNi_0.5Mn_1.5O₄/Li₄Ti₅O₁₂ have been prepared using LiNi_0.5Mn_1.5O₄ and Li₄Ti₅O₁₂（LNMO/LTO） as cathode and anode, respectively. The effects of capacity ratio of positive electrode to negative electrode（P/N） on the electrochemical performance for the full cells have been researched. The system with the P/N for 1.4 has the best cyclic performance and rate capability. At 0.5 C, the full cell of LNMO/LTO with the P/N for 1.4 has the highest discharge specific capacity of 164.1 m Ah·g^-1, and 88 % is kept at the 200 th cycle. At 2 C, the highest specific capacity of 135.2 m Ah·g^-1 is delivered and 91.1 % is kept for the system. The good rate capability and cyclic performance for the system originate from its small resistance and low polarization.更多还原