锂离子电池多孔淀粉硬碳负极材料的制备及性能研究

来源 :第十八次全国电化学大会 | 被引量 : 0次 | 上传用户:feng_zj
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负极是决定动力锂离子电池综合性能的重要因素之一,现阶段锂离子电池负极材料技术开发主要集中在石墨、硬碳、软碳、钛酸锂、合金等材料体系.硬碳(Hard Carbon)是指难石墨化碳,容量可达到400~700mAh/g(远高于石墨的理论容量372mAh/g).
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尽管在过去十来年二次锂离子电池实现了了深远的意义,但是发展用于电动车的高能量、低成本、安全的锂离子电池仍是一个挑战[1].传统锂离子电池常用的负极材料是碳材料,虽然其价格低廉,但存在安全隐患和循环性能差等问题[2].Li4Ti5O12负极材料具有较安全的工作电压(1.55 V vs Li/Li+),可避免安全隐患,但理论容量较低(175mAh g-1)[3].新型材料TiNb2O7有着和Li4Ti
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作为一种储能器件,锂离子电池具有能量密度高,使用寿命长以及环境友好等特点,在便携式电子设备、电动汽车等领域具有广泛的应用前景.为进一步提高锂离子电池的实际比能量,寻找安全稳定且比容量高的电极材料仍是目前研究的热点.二氧化钛(TiO2)结构稳定,价廉易得,无毒无害,是一种具有发展前景的锂离子电池负极材料.
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