• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced energy materials >Contact Resistance of Carbon–Lix(Ni,Mn,Co)O_2 Interfaces
【24h】

Contact Resistance of Carbon–Lix(Ni,Mn,Co)O_2 Interfaces

机译：Contact Resistance of Carbon–Lix(Ni,Mn,Co)O_2 Interfaces

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相关主题

摘要

Electronic resistance in lithium-ion battery positive electrodes is typicallyattributed to the bulk resistance of the active material and the networkresistance of the carbon additive. Expected overpotentials from these bulkcomponents are minimal relative to that from charge-transfer resistance.However, literature reports show that cell overpotentials are often muchmore sensitive to conductive additives than the expected level from bulk orpercolating-network transport. This discrepancy motivated a detailed examinationof the contact resistance between the active material and conductiveadditive. The contact and bulk resistances are simultaneously measuredusing dense bar samples of lithium-layered oxides (Li_xNi_(1/3)Mn_(1/3)Co_(1/3)O_2 andLi_xNi_(0.5)Mn_(0.3)Co_(0.2O_2)) in contact with carbon black. It is found that the contactresistance dominates the overall electronic resistance when the length scaleis smaller than millimeters; after correcting for contact effects, bulk conductivityof layered oxides is determined to be orders-of-magnitude higher thanpreviously reported. In porous electrodes, it is found from three-electrodeelectrochemical impedance spectroscopy that the carbon content mostheavily influences the low-frequency regime (≈0.01 Hz), as opposed to thehigh frequency (>10~3 Hz) regime expected from electronic percolating properties.Constriction effects within the layered oxide are identified as the dominantmechanism for contact resistance and its implication is investigated forporous electrodes.

著录项

获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号