Controllable synthesis of polystyrene microspheres used as template and in-situ carbon source for Li2MnSiO4 cathode material to boost lithium-ion batteries performance,International Journal of Energy Research

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Controllable synthesis of polystyrene microspheres used as template and in-situ carbon source for Li2MnSiO4 cathode material to boost lithium-ion batteries performance
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2021-09-16 , DOI: 10.1002/er.7289
Pengqing Hou _{1,

2} , Yingdong Qu ₁ , Pengwei Li ₃ , Qing Wang _{2,

3} , Shao‐Hua Luo _{2,

3}

Affiliation

Polyanion-type Li₂MnSiO₄ is considered to be a potential lithium storage material due to its high theoretical capacity, low cost, nontoxicity, and good thermal stability. Unfortunately, pure Li₂MnSiO₄ has poor conductivity and diffusion rate of Li⁺, which hinders its wide application in energy storage. In this study, Li₂MnSiO₄ with inverse opal structure is synthesized by simple sol–gel method, and monodisperse polystyrene microspheres (PS) with uniform and controllable size are prepared by soap-free emulsion. Additionally, Li₂MnSiO₄ material with a large specific surface area and mesoporous structure is synthesized by using PS as a template. Specifically, after adding 4 wt% of the PS template, the initial discharge specific capacity of the synthesized Li₂MnSiO₄ material is 109.9 mAh·g⁻¹ at 0.1 C. Compared with pure Li₂MnSiO₄, the electrochemical performance of the material synthesized by this process has been significantly improved, which is attributed to the mesoporous structure and large specific surface area that improve the conductivity. Hence, the Li₂MnSiO₄ cathode material synthesized with PS as a template is expected to become an advanced positive material in lithium energy storage.

中文翻译：

可控合成聚苯乙烯微球作为模板和原位碳源的Li2MnSiO4正极材料提高锂离子电池性能

聚阴离子型Li ₂ MnSiO ₄因其理论容量高、成本低、无毒和良好的热稳定性而被认为是一种潜在的储锂材料。不幸的是，纯Li ₂ MnSiO _4的Li⁺导电性和扩散速率较差，这阻碍了其在储能领域的广泛应用。本研究采用简单的溶胶-凝胶法合成了反蛋白石结构的Li ₂ MnSiO ₄，并通过无皂乳液制备了粒径均匀可控的单分散聚苯乙烯微球（PS）。此外，Li ₂ MnSiO ₄以PS为模板合成了具有大比表面积和介孔结构的材料。具体而言，添加4 wt%的PS模板后，合成的Li ₂ MnSiO ₄材料在0.1 C下的初始放电比容量为109.9 mAh·g ^-1。与纯Li ₂ MnSiO ₄相比，该材料的电化学性能通过该工艺合成得到了显着的改善，这归功于提高了电导率的介孔结构和较大的比表面积。因此，Li ₂ MnSiO ₄以PS为模板合成的正极材料有望成为锂储能领域的先进正极材料。

更新日期：2021-09-16

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