The electrochemical performance of 5.0 V class full cells comprising LiNi_0.5Mn_1.5O₄-graphite is improved by applying metal scavenging coats on the negative electrode surface. To achieve this transition-metal scavenging ability, a tetradentate azamacrocyclic ligand is introduced into a poly(vinyl alcohol) (PVA) backbone through a one-step esterification reaction. The azamacrocyclic ligand-functionalized PVA scavenged five times as many metal ions as that of the pristine polymer counterpart. Due to this scavenging ability, the Coulombic efficiency and cyclability are greatly enhanced in a LiNi_0.5Mn_1.5O₄/functionalized graphite cell composition. Consequently, the increase in discharge resistance during cycles was well retained due to the introduction of this functional polymer on the negative electrode surface.

中文翻译：

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用于5.0 V级高能锂离子电池的氮杂大环配体功能化的过渡金属清除聚合物

通过在负极表面上施加金属清除涂层可以改善包含LiNi _0.5 Mn _1.5 O ₄石墨的5.0 V级全电池的电化学性能。为了实现这种过渡金属清除能力，通过一步酯化反应将四齿氮杂大环配体引入聚乙烯醇（PVA）主链中。氮杂大环配体官能化的PVA清除的金属离子是原始聚合物对应物的五倍。由于具有这种清除能力，LiNi _0.5 Mn _1.5 O _4中的库仑效率和循环性大大提高/功能化的石墨电池组成。因此，由于在负极表面上引入了该功能性聚合物，因此可以很好地保持循环中放电电阻的增加。