Ultrahigh rate and long-life nano-LiFePO4 cathode for Li-ion batteries
Ultrahigh rate and long-life nano-LiFePO4 cathode for Li-ion batteries
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用于锂离子电池的超高倍率和长寿命纳米LiFePO4正极
DOI：
10.1016/j.electacta.2018.06.149
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发表时间：
2018-09-01
影响因子：
6.6
通讯作者：
Zheng, Jun-chao
中科院分区：
文献类型：
--
作者：
An, Chang-sheng;Zhang, Bao;Zheng, Jun-chao
LiFePO4是最有前途的锂离子电池正极材料之一。然而，其较低的电子电导率和缓慢的锂离子扩散速率导致其电化学性能较差，尤其是倍率性能较差。通过自组装方法成功合成了LiFePO4/氮硫共掺杂石墨烯杂化物。鉴于其氮和硫共掺杂石墨烯基质，该混合物对 LiFePO4 的电子电导率产生显着影响，从而产生优异的电化学性能和功率密度。 LiFePO4复合材料在10 C下的可逆容量为106.1 mAhg(-1)，在15 C下的可逆容量为94.6 mAhg(-1)。此外，氮硫共掺杂石墨烯在10 C下循环500次后，放电容量损失小于5%，可有效提高LiFePO4的电化学性能。 (C) 2018 Elsevier Ltd. 保留所有权利。
LiFePO4 is one of the most promising cathode materials for Li-ion batteries. However, its low electronic conductivity and slow Li-ion diffusion rate lead to poor electrochemical performance, especially poor rate performance. The hybrid of LiFePO4/Nitrogen and Sulfur co-doped graphene is successfully synthesized via a self-assembly method. Given its Nitrogen and Sulfur co-doped graphene matrix, the hybrid exerts a significantly impact on the electron conductivity of LiFePO4, resulting in excellent electrochemical properties and power density. The LiFePO4 composite has reversible capacity of 106.1 mAhg (-1) at 10 C and 94.6 mAhg(-1 )at 15 C. Moreover, with less than 5% loss of discharge capacity after 500 cycles at 10 C, the Nitrogen and Sulfur co-doped graphene can effectively improve the electrochemical performance of LiFePO4. (C) 2018 Elsevier Ltd. All rights reserved.