In situ preparation of double gradient anode materials based on polysiloxane for lithium-ion batteries.
In situ preparation of double gradient anode materials based on polysiloxane for lithium-ion batteries.
复制标题
DOI：
10.1039/d3na00285c
复制
发表时间：
2023-08-08
影响因子：
4.7
通讯作者：
中科院分区：
文献类型：
--
作者：
虽然硅作为锂离子电池的负极材料具有很高的体积能量密度，但其体积膨胀和缓慢的锂离子迁移动力学需要迫切解决。在这项工作中，由多面体低聚硅氧烷（t8型POSS）原位氢还原衍生的笼状结构材料（HRPOSS）被构建为锂离子电池的Si@C阳极。得益于Si/N双梯度和硅均匀分布的特点，HRPOSS-6表现出微弱的体积变化和快速的离子电子动力学。此外，均匀固定的纳米硅和浓度梯度有利于加速离子迁移。因此，HRPOSS-6具有良好的电化学性能，其笼状结构可以缓解体积膨胀。HRPOSS-6具有1814.1 mA h g−1的高可逆容量，在0.5 a g−1电流密度下，以635 mA h g−1循环200次后的长循环性能。因此，这种Si/C/N复合材料在高能锂离子电池中表现出巨大的潜力，其相应的全电池（HRPOSS-6//LiNi0.6Co0.2Mn0.2O2）在1C倍率下具有200次循环寿命和超过80%的容量保持率。这项工作利用双元素的浓度梯度来提高硅阳极的容量，并为高性能Si@C阳极材料的开发提供了见解，用于先进的锂离子电池。构建了原位氢还原t8型POSS作为lib的Si@C阳极。得益于Si/N双梯度和均匀分布的硅，HRPOSS-6处理微弱的体积变化和快速的离子电子动力学。
Although silicon has a high volumetric energy density as an anode material for Li-ion batteries, its volumetric expansion and sluggish Li+ migration kinetics need to be urgently addressed. In this work, cage-like structure materials (HRPOSS) derived from the in situ hydrogen reduction of polyhedral oligomeric silsesquioxane (T8-type POSS) were constructed as an Si@C anode for Li-ion batteries. Benefiting from the intriguing features of the Si/N double gradient and even-distributed silicon, HRPOSS-6 exhibited faint volume changes and fast ion-electron kinetics. Moreover, the uniformly immobilized nano-silicic and concentration gradient were favorable for accelerated ion migration. Therefore, HRPOSS-6 exhibited good electrochemical performances given that its cage structure could relieve the volume expansion. HRPOSS-6 demonstrated a high reversible capacity of 1814.1 mA h g−1 and long cycling performance after 200 cycles with 635 mA h g−1 at a current density of 0.5 A g−1. Accordingly, this Si/C/N composite exhibited great potential for high energy Li-ion batteries, where the corresponding full-cell (HRPOSS-6//LiNi0.6Co0.2Mn0.2O2) showed a cycle life of 200 cycles with over 80% capacity retention at rate of 1C. This work exploits the concentration gradients of dual elements for the capacity improvement of Si anodes and offers insight into the development of high-performance Si@C anode materials for advanced Li-ion batteries. In situ hydrogen reduction of T8-type POSS are constructed as Si@C anodes for LIBs. Benefiting from the Si/N double gradient and even-distributed silicon, HRPOSS-6 processes faint volume changes and fast ion-electron kinetics.
登录
查看更多内容
高功率、稳定的磷掺杂蛋黄壳结构Si@C阳极同时增强电导率和锂扩散动力学
影响因子：
9.9
作者：
Chen, Ming;Zhou, Qinnan;Qian, Xuefeng
通讯作者：
Qian, Xuefeng
影响因子：
3.2
作者：
Grill, A;Neumayer, DA
通讯作者：
Neumayer, DA
影响因子：
16.6
作者：
Hu, Lung-Hao;Wu, Feng-Yu;Li, Lain-Jong
通讯作者：
Li, Lain-Jong
影响因子：
11.9
作者：
Han, Meisheng;Mu, Yongbiao;Yu, Jie
通讯作者：
Yu, Jie
影响因子：
16.6
作者：
Chen, Bingjie;Zu, Lianhai;Yang, Jinhu
通讯作者：
Yang, Jinhu