利用K⁺、Cl-共掺杂来优化纳米Li₂FeSiO₄/C正极材料的结构及电化学性能，通过固相反应制备了纳米Li_2-xK_xFeSiO_4-0.5xCl_x/C (x=0、0.01、0.02)正极材料。采用X射线衍射、扫描电子显微镜、透射电子显微镜、X射线光电子能谱和恒电流充放电等对比研究了3种正极材料的微观结构特征和电化学性能。研究表明纳米Li_1.99K_0.01FeSiO_3.995Cl_0.01/C正极材料的晶面间距和晶胞体积最大，颗粒粒径最小，平均粒径为32 nm。这些特定的微观结构使其表现出最优的电化学性能。纳米Li_1.99K_0.01FeSiO_3.995Cl_0.01/C在0.1C下的首次放电比容量高达203 mAh·g^-1，在1C下充放电循环100次的容量保持率为97.72%。

首先采用共沉淀方法制备富锂锰基正极材料Li_1.2Mn_0.54Ni_0.13Co_0.13O₂原始样品(P-LRMO)，然后通过简单的湿化学法以及低温煅烧方法对其进行不同含量Ga₂O₃原位包覆。透射电子显微镜(TEM)以及X射线光电子能谱(XPS)结果表明在P-LRMO表面成功合成了Ga₂O₃包覆层。电化学测试结果表明：含有3%Ga₂O₃的改性材料G3-LRMO具有最优的电化学性能，其在0.1C倍率(电流密度为25 mA·g^-1)下首圈充放电比容量可以达到270.1 mAh·g^-1，在5C倍率下容量仍能保持127.4 mAh·g^-1，优于未改性材料的90.7 mAh·g^-1，表现出优异的倍率性能。G3-LRMO在1C倍率下循环200圈后仍有190.7 mAh·g^-1的容量，容量保持率由未改性前的72.9%提升至85.6%，证明Ga₂O₃包覆改性能有效提升富锂锰基材料的循环稳定性。并且，G3-LRMO在1C倍率下循环100圈后，电荷转移阻抗(R_ct)为107.7 Ω，远低于未改性材料的251.5 Ω，表明Ga₂O₃包覆层能提高材料的电子传输速率。

Two alkali-metal sulfamates nonlinear optical (NLO) crystals, Li(NH₂SO₃) and Na(NH₂SO₃), have been obtained through the facile evaporation method. Li(NH₂SO₃) crystallizes in the polar space group Pca2₁ (No.29). The structure of Li(NH₂SO₃) can be described as a 3D network formed by [LiO₄]^7- polyhedral connecting with NH₂SO₃^- tetrahedra through corner-sharing. Na(NH₂SO₃) crystallizes in the polar space group P2₁2₁2₁ (No.19). The structure of Na(NH₂SO₃) can be described as a 3D network formed by distorted [NaO₆]^11- octahedral connecting with NH₂SO₃^- tetrahedra through corner-sharing. The UV-Vis-near-infrared spectra demonstrate that Li(NH₂SO₃) and Na(NH₂SO₃) possessed large optical band gaps of 5.25 and 4.81 eV, respectively. Powder second-harmonic generation (SHG) measurements demonstrate that the SHG intensity of Li(NH₂SO₃) and Na(NH₂SO₃) were 0.32 times and 0.31 times that of KH₂PO₄, respectively. First-principles calculations confirm the nonlinear optical performance mainly derived from the synergistic effect of amino sulfonate anions and alkali metal oxide anionic polyhedra.

在镍钴铝酸锂正极材料Li[Ni_0.8Co_0.15Al_0.05]O₂(NCA)制备过程中表面遗留的碱性物质会严重影响其循环稳定性能，针对这一难题，提出使用Y(PO₃)₃对其进行表面包覆改性，利用Y(PO₃)₃与表面残留的LiOH反应消除表面残碱，并探讨包覆改性对NCA整体性能的影响机制。测试分析结果表明，在低温煅烧过程中前驱体表面会形成均匀致密的Y(PO₃)₃和LiPO₃包覆层，LiPO₃有较高的离子电导率，双包覆层能够防止活性物质在电化学循环过程中与电解液相互接触时发生有害副反应，提高电极材料的循环稳定性。其中Y(PO₃)₃包覆量(质量分数)为1%的样品在0.1C下的首次库仑效率从未改性样品的78.65%提高到88.50%，在1C下循环150圈后容量保持率从59.38%提高到85.33%，相比于未改性样品具有更高的首次库仑效率和更优异的循环性能。