Poly (acrylic acid sodium) grafted carboxymethyl cellulose as a high performance polymer binder for silicon anode in lithium ion batteries.
Poly (acrylic acid sodium) grafted carboxymethyl cellulose as a high performance polymer binder for silicon anode in lithium ion batteries.
复制标题
聚丙烯酸钠接枝羧甲基纤维素作为锂离子电池硅负极的高性能聚合物粘合剂
DOI：
10.1038/srep19583
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发表时间：
2016-01-20
影响因子：
4.6
通讯作者：
Wei H
中科院分区：
文献类型：
--
作者：
Wei L;Chen C;Hou Z;Wei H
高容量硅（Si）阳极在充放电循环过程中体积变化较大，需要设计新型粘结剂体系。在这里，我们介绍了一种聚丙烯酸钠接枝羧甲基纤维素（NaPAA-g-CMC）共聚物作为锂离子电池（LIBs）中硅阳极的优良粘合剂。以CMC和丙烯酸为前驱体，采用自由基接枝聚合法制备了NaPAA-g-CMC共聚物。与线性一维粘结剂不同，NaPAA-g-CMC共聚物粘结剂有望与Si表面呈现多点相互作用，从而增强与Si颗粒以及铜集流器的结合能力，并在Si表面建立稳定的固体电解质界面（SEI）层。与传统的线性高分子结合剂如CMC和NaPPA相比，NaPAA-g-CMC基硅阳极具有更好的循环稳定性和更高的库仑效率。
The design of novel binder systems is required for the high capacity silicon (Si) anodes which usually undergo huge volume change during the charge/discharge cycling. Here, we introduce a poly (acrylic acid sodium)-grafted-carboxymethyl cellulose (NaPAA-g-CMC) copolymer as an excellent binder for Si anode in lithium ion batteries (LIBs). The NaPAA-g-CMC copolymer was prepared via a free radical graft polymerization method by using CMC and acrylic acid as precursors. Unlike the linear, one-dimensional binders, the NaPAA-g-CMC copolymer binder is expected to present multi-point interaction with Si surface, resulting in enhanced binding ability with Si particles as well as with the copper (Cu) current collectors and building a stable solid electrolyte interface (SEI) layer on the Si surface. The NaPAA-g-CMC based Si anode shows much better cycle stability and higher coulombic efficiency than those made with the well-known linear polymeric binders such as CMC and NaPPA.