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首页> 外文会议>Pacific Rim Meeting on Electrochemical and Solid-State Science >Electrochemical Properties of Ti-Based Negative Electrode Materials with Different Binders Possessing Branched Structures for Rechargeable Sodium-Ion Batteries
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Electrochemical Properties of Ti-Based Negative Electrode Materials with Different Binders Possessing Branched Structures for Rechargeable Sodium-Ion Batteries

机译：具有不同粘合剂的Ti基负极材料的电化学性能，具有具有用于可充电钠离子电池的支链结构

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摘要

Because of the ubiquitous availability of sodium resources and its relatively low electrode potential, rechargeable sodium batteries have been extensively studied for energy storage applications. However, a major obstacle to realize sodium batteries is the absence of suitable negative electrode materials. Titanium-based layered materials, e.g., P3-type Na_(0.58)Cr_(0.58)Ti_(0.42)O_2, are proposed as potential candidates for this purpose. Nevertheless, when poly(vinylidene fluoride), PVdF, is used as a binder, large irreversible capacities for initial cycle are observed, which hinders its use for practical applications. In this study, instead of PVdF, acrylonitrile-grafted poly(vinyl alcohol) copolymer, PVA-g-PAN, is used as the binder for P3-type Na_(0.58)Cr_(0.58)Ti_(0.42)O_2. PVA-g-PAN is a non-fluorine polymer with a branched structure prepared by graft polymerization, and the branched structure associated with PAN side chains is beneficial for better dispersion of nanosize carbon and higher coatability to active materials. For comparison, acrylonitrile and ether-based monomers grafted PVA, PVA-g-P (AN-co-E), is also prepared and is used as the binder. This polymer has better interaction with electrolyte associated with the presence of negatively charged oxygen species. By using these three different polymer binders, factors affecting electrode performance of Ti-based composite electrode are discussed in detail.
机译：由于钠资源的无处不在的可用性及其相对低的电极电位，可充电钠电池被广泛研究了能量储存应用。然而，实现钠电池的主要障碍是没有合适的负极材料。基于钛的层状材料，例如，P3型Na_（0.58）CR_（0.58）Ti_（0.42）O_2，作为此目的的潜在候选者。然而，当聚（偏二氟乙烯），PVDF用作粘合剂时，观察到初始循环的大不可逆容量，阻碍了其用于实际应用的用途。在该研究中，代替PVDF，丙烯腈接枝的聚（乙烯醇）共聚物PVA-G-PAN，用作P3型Na_（0.58）Cr_（0.58）Ti_（0.42）O_2的粘合剂。 PVA-G-PAN是一种非氟聚合物，其具有通过接枝聚合制备的支化结构，与PAN侧链相关的支化结构是有益的，可以更好地分散纳米碳碳和更高的活性材料的涂布性。对于比较，还制备丙烯腈和基于乙醚的单体接枝PVA，PVA-G-P（An-Co-e），并用作粘合剂。该聚合物与与带负电氧物质的存在相关的电解质具有更好的相互作用。通过使用这三种不同的聚合物粘合剂，详细讨论了影响Ti基复合电极的电极性能的因素。

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