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高性能硅阳极,High-performance silicon anode;1 micron silicon particles in crosslinked conducting polyanaline matrix

别名:掺杂聚苯胺;Doped polyaniline, Si encapsulated in 3D crosslinked polyaniline, Si/PANi composite, Silicon micron particle
制造商品牌: 西格玛 Sigma-Aldrich
货号(SKU): 912409
增值税发票 √ 免费送货 √ 订货电话:010-68689484
¥4,680.26

说明

硅是最有前途的下一代锂离子电池电极材料,因为它的比容量(3600 mAh/g)比石墨(372 mAh/g)高约 10 倍。然而,在锂插入过程中,硅会经历较大的体积变化(~400%),导致其断裂并从集电器上分离,从而使原型锂硅电池在不到 10 个充放电循环内失去大部分容量。解决硅锂化后体积显着膨胀所带来的容量和稳定性问题对于高容量锂离子电池的成功至关重要。

这种硅/PANi 复合材料利用掺杂的、本征导电的 3D 交联聚苯胺作为基体,可用作硅基电极的导电粘合剂和聚合物电解质。先前对类似的硅基三维导电聚合物复合材料的研究表明,由于扩散路径短和良好的 3D 连接性,电化学性能得到了提高,并导致循环性能显着提高,5,000 次循环后容量保持率超过 90%。

这种复合材料是通过将硅颗粒封装在原位聚合的 3D 交联导电聚苯胺框架中制成的。这种 Si/PANi 复合材料不仅允许快速的电和离子传输,而且还提供自由空间以允许巨大的体积膨胀。这种 Si/PANi 复合材料提供了一种即用型电化学活性硅复合材料,可提高传统锂离子电池的容量,并提高硅基负极的循环寿命。

应用

Silicon is a most promising next generation lithium ion battery electrode material, due to its ~10 times higher specific capacity (3600 mAh/g) than graphite (372 mAh/g). However, silicon experiences large volume change (~400%) during lithium insertion, causing it to fracture and detach from current collector, rendering prototypical lithium-silicon batteries to lose most of their capacity in less than 10 charge-discharge cycles. A solution to the capacity and stability issues posed by the significant volume expansion upon lithiation of silicon is critical to the success of high capacity lithium ion batteries.

This silicon/PANi composite utilizes a doped, intrinsically conductive, 3D cross-linked polyaniline as matrix, which could function as both the conductive binder and the polymer electrolyte for silicon-based electrodes. Previous study for a similar silicon-based three-dimensional conducting polymer composite demonstrated increased electrochemically performance due to short diffusion paths and good 3D connectivity, and resulted in a marked improvement in cyclability, with over 90% capacity retention after 5,000 cycles.

This composite is made by encapsulating silicon particles in an in-situ polymerized 3D-crosslinked conductive polyaniline framework. This Si/PANi composite not only allows fast electrical and ionic transport, but also provides free space to allow giant volume expansion. This Si/PANi composite provides a ready-to-use electrochemically active silicon composite that would increase the capacity of conventional lithium ion battery, and improve the cycle-life of Si-based anodes.
 
 

属性

质量水平

100

形式

solid

 

安全信息

储存分类代码

11 - Combustible Solids

WGK

WGK 3

商品规格
属性名称属性值
储存温度 Storage temp.常温阴凉避光
全球实时库存 Availability √美国St. Louis ≥ 33 | 欧洲Eur. ≥ 27 | 東京Tokyo ≥ 9 | 香港与北京 ≥ 16