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首页> 外文会议>IUPAC 10th International conference on novel materials and their synthesis: Book of abstracts >HETEROJUNCTION FORMATION OF SOLID ELECTROLYTE AND ELECTRODE ACTIVE MATERIALS BY GLASS-FLUX APPROACHES FOR ALL-SOLID-STATE LIBS
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HETEROJUNCTION FORMATION OF SOLID ELECTROLYTE AND ELECTRODE ACTIVE MATERIALS BY GLASS-FLUX APPROACHES FOR ALL-SOLID-STATE LIBS

机译：全固态LIBS的玻璃通量法研究固体电解质和电极活性材料的异质结形成

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All-solid-state lithium ion rechargeable batteries (LIBs) consisting of solid electrolytes have been desired for higher energy density, long term durability and safety. A great challenge of all-solid state LIBs for practical use is reduction of the interfacial resistance. Effective interface modification techniques have been proposed, however, the interfacial resistance is still large because the charge transfer resistance at the active material/ solid electrolyte interface would be strongly affected by interfacial contact condition. Herein, we propose a new route to prepare smart interfaces for all-solid-state lithium ion batteries (LIBs). Direct growth of electrode active material crystals layer inside of Li ion conductive glass will provide heterojunction formation at their interface. Cross-sectional SEM and HR-TEM observation coupled with EDX-based elemental analysis revealed that the spattered Co layer was completely converted to highly crystalline LiCoO_2 crystals having hexagonal plate-like shape. Note that the each LiCoO_2 crystals were vertically grown from the Pt substrate. The both interfaces between the crystals and the glass matrixes, between the crystal layer and the current collector surface were well-connected without any impurely phase and pinhole formation. We further characterized their LIB properties with metal lithium as a counter electrode. Typical charge-discharge operation at 0.1C based on Li ion intercalation-deintercalation reaction was obviously observed at 150℃, indicating that this was believed to be due to the efficient lithium-ion transportation in the LIB cell. We think the direct formation of the hetero-junction in Li ion conduction glass matrix reduce its interfacial resistance for lithium ion transportation during all-solid-state LIBs operation. Further details of the structural and the LIB characteristics on Li_4Ti_5O_(12) and Li_(7-x)La_3Zn_(2-x)Nb_xO_(12) crystals fabricated directly in Li_3BO_3 glass will present in the NMS-X meeting.
机译：为了获得更高的能量密度，长期的耐用性和安全性，已经期望由固体电解质组成的全固态锂离子可充电电池（LIB）。实际使用的全固态LIB的一大挑战是降低界面阻力。已经提出了有效的界面改性技术，但是，界面电阻仍然很大，因为活性材料/固体电解质界面处的电荷转移电阻会受到界面接触条件的强烈影响。本文中，我们提出了一条新的路线来为全固态锂离子电池（LIB）准备智能接口。锂离子导电玻璃内部的电极活性材料晶体层的直接生长将在其界面处形成异质结。截面SEM和HR-TEM观察以及基于EDX的元素分析表明，溅射的Co层已完全转变为具有六角形板状形状的高结晶LiCoO_2晶体。注意，每个LiCoO_2晶体从Pt衬底垂直生长。晶体与玻璃基体之间，晶体层与集电器表面之间的两个界面都很好地连接，没有任何不纯的相和针孔形成。我们用金属锂作为对电极进一步表征了它们的LIB特性。在150℃时，可以明显地观察到基于Li离子嵌入-脱嵌反应在0.1C下的典型充放电操作，表明这被认为是由于LIB电池中锂离子的有效传输。我们认为在锂离子传导玻璃基体中直接形成异质结会降低其在全固态LIB操作期间用于锂离子传输的界面电阻。将直接在Li_3BO_3玻璃中制造的Li_4Ti_5O_（12）和Li_（7-x）La_3Zn_（2-x）Nb_xO_（12）晶体的结构和LIB特性的更多细节将在NMS-X会议上发表。

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