INTELEC, International Telecommunications Energy Conference (Proceedings) | Year: 2012
With over 20 years of continuous monitoring of batteries, archival of a trillion points of data, timelines, and trends of over 1.2 million battery units, we are finding some common aging history. © 2012 IEEE. Source
Qiao Q.Q.,Nankai University |
Zhang H.Z.,Nankai University |
Li G.R.,Nankai University |
Ye S.H.,Nankai University |
And 2 more authors.
Journal of Materials Chemistry A | Year: 2013
Enhancement of the discharge capacity, high-rate capability, and cycle stability of the Li-rich layered Li(Li0.17Ni0.25Mn 0.58)O2 oxide with a large specific capacity is highly significant for high energy lithium-ion batteries. In this work, the Li-rich layered Li(Li0.17Ni0.25Mn0.58)O2 oxide is prepared by a spray-drying method. The surface modification with the Li-Mn-PO4 is introduced onto Li-rich layered Li(Li 0.17Ni0.25Mn0.58)O2 oxide for the first time. It is demonstrated that the surface of Li(Li0.17Ni 0.25Mn0.58)O2 grains is coated with the thin amorphous Li-Mn-PO4 layer (5 wt%). With increasing calcination temperature after the surface coating, a strong interaction can be induced on the interface between the amorphous Li-Mn-PO4 layer and the top surface of Li(Li0.17Ni0.25Mn0.58)O2 grains. As anticipated, the discharge capacity and high-rate capability are obviously improved for the Li-Mn-PO4-coated sample after calcination at 400 °C, while excellent cycle stability is obtained for the Li-Mn-PO 4-coated sample after calcination at 500 °C as compared with the as-prepared Li(Li0.17Ni0.25Mn0.58)O2 oxide during cycling. Apparently, the interface interaction between the amorphous Li-Mn-PO4 layer and the top surface of Li(Li 0.17Ni0.25Mn0.58)O2 grains is responsible for the improvement of the reaction kinetics and the electrochemical cycle stability of Li-Mn-PO4-coated samples. © 2013 The Royal Society of Chemistry. Source
31st International Battery Seminar and Exhibit 2014: Primary and Secondary Batteries - Other Technologies | Year: 2014
• Ultra-low power applications range from "fashion and convenience" to medical, safety & asset tracking • Ultra-low power technology continues to evolve - but we already have practical power management solutions today across a broad spectrum of technologies • Key issues: - Special considerations for very small cells • Proper charge control and termination • Charging from various (or "any available") input sources - High efficiency energy conversion even at very low power levels - Capacity Monitoring for very small cells - need ultra low Iq circuits - Wireless charging allows design of weatherproof / waterproof equipment, but TX/RX coils and ICs need to be adapted to low power applications. Copyright © (2014) by Florida Educational Seminars, Inc. All rights reserved. Source
Power-battery | Date: 2012-02-09
The chemical current source can be used in the electrical devices, wherein it is feeding the electrical devices that constantly operate or can temporarily/accidentally be under extreme conditions produced with the different negative factors such as fire, various types of radiation, including heat, electromagnetic etc., various types of mechanical effects, e.g. a blow and so on. The chemical current source consists of a housing with current feedthroughs and solid-state galvanic cells that are arranged within the housing and connected to the current feedthroughs, contain an anode, an electrolyte, a cathode based on solid-state ionic conductors. For the multifunctional use in the electrical device the chemical current source is made as a thermal protection and (or) a protective shield for the protection of the electrical device or some its parts against external effects and (or) environment against effects going from the electrical device or some its parts.
Zhang L.,Beijing Institute of Technology |
Li N.,Beijing Institute of Technology |
Wu B.,Beijing Institute of Technology |
Wu B.,Power-battery |
And 5 more authors.
Nano Letters | Year: 2015
High-energy and high-power Li-ion batteries have been intensively pursued as power sources in electronic vehicles and renewable energy storage systems in smart grids. With this purpose, developing high-performance cathode materials is urgently needed. Here we report an easy and versatile strategy to fabricate high-rate and cycling-stable hierarchical sphered cathode Li1.2Ni0.13Mn0.54Co0.13O2, by using an ionic interfusion method. The sphere-shaped hierarchical cathode is assembled with primary nanoplates with enhanced growth of nanocrystal planes in favor of Li+ intercalation/deintercalation, such as (010), (100), and (110) planes. This material with such unique structural features exhibits outstanding rate capability, cyclability, and high discharge capacities, achieving around 70% (175 mAh g-1) of the capacity at 0.1 C rate within about 2.1 min of ultrafast charging. Such cathode is feasible to construct high-energy and high-power Li-ion batteries. © 2014 American Chemical Society. Source