Polyacrylonitrile-polyvinylidene fluoride as high-performance composite binder for layered Li-rich oxides

Polyacrylonitrile-polyvinylidene fluoride as high-performance composite binder for layered Li-rich oxides
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聚丙烯腈-聚偏二氟乙烯作为层状富锂氧化物的高性能复合粘合剂

DOI:
10.1016/j.jpowsour.2017.05.063
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发表时间:
2017-08
影响因子:
9.2
通讯作者:
Bao Liying
Bao Liying
中科院分区:
工程技术2区
文献类型:
--
作者:
Wu Feng;Li Weikang;Chen Lai;Lu Yun;Su Yuefeng;Bao Wurigumula;Wang Jing;Chen Shi;Bao Liying

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层状富锂氧化物(LLRO)在循环过程中会出现严重的容量衰减,特别是当其尺寸为亚微米或纳米级时。在这里,我们报告了聚丙烯腈(PAN)作为粘合剂,以保持尺寸为100 nm的LLRO的容量,PAN与聚偏氟乙烯(PVDF)的组合作为复合粘合剂,实现了优异的循环和倍率性能,同时利用PAN和PVDF。在40次循环后,PAN-PVDF电极的容量保持率为89.6%,而PVDF电极的容量保持率为77.5%,PAN电极的容量保持率为85.1%。SEM图像清楚地表明,PAN-PVDF作为复合粘合剂将活性材料牢固地保持在层压板上,导致很少的裂纹和空隙。电化学阻抗谱表明,避免这些空隙和裂纹导致较低的电阻。复合粘结剂在改善低放热再生氧化物的循环和倍率性能方面发挥了重要作用。
Layered lithium-rich Oxides (LLROs) suffer from serious capacity fading during the cycling especially when the size is in sub-micron or nanoscale. Here we report the polyacrylonitrile (PAN) as a binder to maintain the capacity of LLROs sized ∼200 nm, the combined PAN with polyvinylidene fluoride (PVDF) achieve excellent cycle and rate performance as the composite binder taking advantages from both PAN and PVDF. The capacity retention of PAN-PVDF electrode after 40 cycles is 89.6%, comparing to the 77.5% of PVDF electrode and 85.1% of PAN electrode. The SEM images pronouncedly illustrates that PAN-PVDF as composite binder holds the active material on the laminates firmly, resulting few cracks and voids. The electrochemical impedance spectra indicate that averting those voids and cracks lead to lower resistance. The composite binder has played a significant role in improving the cycling and rate performance of LLROs.
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