Battery R&D Center, Samsung SDI , Suwon, Gyunggido 16677, Republic of Korea.
Automotive & ESS Business, Samsung SDI , Yongin, Gyunggido 17084, Republic of Korea.
ACS Appl Mater Interfaces. 2016 May 18;8(19):12205-10. doi: 10.1021/acsami.6b03113. Epub 2016 May 9.
A lithium ionic conductor, Li1.3Al0.3Ti1.7(PO4)3 (LATP), is introduced as a coating material on the surface of Mg-doped LiCoO2 to improve electrochemical performances for high-voltage (4.5 V) lithium ion batteries. Structure, morphology, elemental distribution, and electrical properties of the materials are thoroughly characterized by SEM, TEM, EELS, EDS, and C-AFM. The coating layer is electrically conductive with the aid of Mg ions which are used as a dopant for the active materials; therefore, this mixed electronic ionic conductor strongly enhances the electrochemical performances of initial capacity, cycling property, and rate capability. The LATP coating layer also demonstrates very promising applicability for 4.4 V prismatic full cells with graphite anode, which correspond to the 4.5 V half-cells with lithium anode. The 2900 mA h full cells show 85% of capacity retention after 500 cycles and more than 60% after 700 cycles.
一种锂离子导体 Li1.3Al0.3Ti1.7(PO4)3（LATP）被引入作为表面涂层材料来改善用于高压（4.5 V）锂离子电池的掺镁 LiCoO2 的电化学性能。通过 SEM、TEM、EELS、EDS 和 C-AFM 对材料的结构、形态、元素分布和电性能进行了彻底的表征。涂层层在 Mg 离子的辅助下具有导电性，Mg 离子被用作活性材料的掺杂剂；因此，这种混合电子离子导体极大地增强了初始容量、循环性能和倍率性能的电化学性能。LATP 涂层还非常适用于具有石墨阳极的 4.4 V 棱柱形全电池，与具有锂阳极的 4.5 V 半电池相对应。2900 mAh 全电池在 500 次循环后保留了 85%的容量，在 700 次循环后保留了 60%以上的容量。
