Maple Ridge, Canada
Maple Ridge, Canada

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Burns J.C.,Dalhousie University | Kassam A.,E One Moli Energy Canada Ltd. | Sinha N.N.,Dalhousie University | Downie L.E.,Dalhousie University | And 3 more authors.
Journal of the Electrochemical Society | Year: 2013

Battery and EV manufacturers carry out extensive long-term tests to estimate the lifetime of the battery and base warranty durations on those tests. The long duration of these tests slows progress in the research and development required to improve the lifetime of Li-ion batteries. This paper shows that accurate measurements of coulombic efficiency (CE) and impedance spectra of Li-ion batteries, that take a few weeks to acquire, can be used to rank the resulting lifetime of Li-ion cells. Adding one or more electrolyte additives to Li-ion batteries that act synergistically can dramatically improve the CE and long-term tests show corresponding ten-fold improvements in lifetime. © 2013 The Electrochemical Society. All rights reserved.


Burns J.C.,Dalhousie University | Petibon R.,Dalhousie University | Nelson K.J.,Dalhousie University | Sinha N.N.,Dalhousie University | And 3 more authors.
Journal of the Electrochemical Society | Year: 2013

LiCoO2/graphite and Li[Ni1/3Mn1/3Co 1/3]O2/graphite pouch cells and Li[Ni 1-x-yMnxCoy]O2/graphite 18650 cells were made with varying concentrations of vinylene carbonate (VC) and studied using high precision coulometry, extended cycling as well as electrochemical impedance spectroscopy (EIS). As expected, adding increased concentrations of VC (up to 6 wt%) to the control electrolyte resulted in improved coulombic efficiency, decreased charge endpoint slippage and longer cycle life. However, high concentrations of VC led to larger charge transfer resistance, especially at the graphite negative electrode. Understanding how varying amounts of VC impact cell lifetime and impedance allows for optimized electrolyte formulations to be found for different applications that may balance lifetime and power demands. © 2013 The Electrochemical Society. All rights reserved.


Patent
E ONE MOLI ENERGY CANADA Ltd | Date: 2010-12-07

The present invention relates generally to a metal canned battery that does not suffer reduced effectiveness in mechanical reliability upon dropping or vibration. More particularly, the invention pertains to a metal canned battery that has a substance therein that causes the electrode assembly to adhere to the exterior can. In one aspect, the battery is of a winding type wherein a cathode and an anode sheet are wound along with a polymer separator between them to form a jelly roll that is inserted into a cylindrical or prismatic metal can. The jelly roll is wrapped with an adhesive polymer layer or the inner wall of the metal can is coated with an adhesive polymer layer. The polymer layer is capable of swelling in a non-aqueous liquid electrolyte to provide a good adhesive between the metal can and the jelly roll and thereby improve the mechanical reliability and safety of the battery during drop or vibration.


Patent
E ONE MOLI ENERGY CANADA Ltd and E One Moli Energy Corporation | Date: 2011-03-18

The present invention generally relates to electrochemical batteries, and more specifically, to the combined additives in the non-aqueous electrolyte for rechargeable lithium-ion batteries containing spinel-based cathode that may enhance the performance of the batteries. The mixed additives comprising of 1,8-bis(dialkylamino)naphthalene, wherein alky group is described by C_(n)H_(2n+1), n=1 to 3, and vinylene carbonate (VC) are added to the electrolyte of the lithium-ion batteries greatly improve the capacity recovery and reduce AC impedance growth during the high temperature storage. The incorporation of the two kinds of additives within the electrolyte of the battery can also improve the high temperature cycling performance.

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