Lithium Ion Batteries for Implanted Medical Devices

描述(由申请人提供)： 最先进的可充电电池无法提供所需的高能量密度，以便将植入设备的患者从捆绑的外部电源中解放出来。能够为左心室辅助装置患者或完全人工心脏患者提供显著更多的脱线时间，将极大地提高他或她的生活质量。因此，我们提议的研究目的是开发先进的电解液材料及其配方，使其能够安全地从植入的锂离子(Li-ion)充电电池中提取更多能量。在第一阶段，我们研制了一系列新的离子液体基凝胶聚合物电解质，具有显著的性能，包括不可燃性、增强的氧化稳定性，以及通过差示扫描量热仪测定的在强制过充电条件下的抗热漂移。加入新电解液的锂离子电池可以在生理温度下重复循环到高充电电位，从而显着增加能量密度。在第二阶段，我们建议改进凝胶-聚合物电解质配方，特别是在高电压下锂离子电池的安全性方面。根据与威尔逊大批量技术公司(WGT)(纽约州克拉伦斯)达成的联盟协议，我们的先进电解液将被整合到螺旋缠绕AA电池中。WGT将使这些电池面临各种滥用条件，包括在高温下强制过度充电。我们预计，第二阶段的成功完成将带来一系列先进的锂离子电池，这些电池提供的能量密度比传统电解液高得多。

DESCRIPTION (provided by applicant): State-of-the-art rechargeable batteries are incapable of providing the high energy densities required in order to free the device-implanted patient from a tethered external power source. The ability to provide a left ventricular assisted device patient or totally artificial heart patient with significantly more time "off-tether" would greatly improve his or her quality of life. Therefore, the aim of our proposed research is to develop advanced electrolyte materials and formulations thereof that would safely enable the extraction of more energy from an implanted lithium-ion (Li-ion) rechargeable battery. In Phase I we formulated a new family of ionic liquid-based gel-polymer electrolytes with remarkable properties including non-flammability, enhanced oxidative stability, and resistance to thermal excursions under conditions of forced overcharge as determined by differential scanning calorimetry. Li-ion cells that incorporated the new electrolytes could be repeatedly cycled at physiological temperatures to high charge potentials resulting in a significant increase in energy density. In Phase II we propose to refine the gel-polymer electrolyte formulation, particularly in respect to Li-ion cell safety at high voltages. Under a Consortium Agreement with Wilson Greatbatch Technologies (WGT) (Clarence, NY), our advanced electrolytes will be incorporated into spiral wound AA cells. WGT will subject these cells to a variety of abuse conditions including forced overcharge at elevated temperatures. We anticipate that the successful completion of Phase II will lead to a broad spectrum of advanced Li-ion batteries that offer significantly higher energy densities than are achievable with conventional electrolytes.