Battery Power - Summer 2016 - (Page 4)

Editor's Choice Cleaning Up Hybrid Battery Electrodes Improves Capacity and Lifespan Hybrid batteries that charge faster than conventional ones could have significantly better electrical capacity and long-term stability when prepared with a gentle-sounding way of making electrodes. Called ion soft-landing, the high-precision technique resulted in electrodes that could store a third more energy and had twice the lifespan compared to those prepared by a conventional method. Straightforward to set up, the method could eventually lead to cheaper, more powerful, longerlasting rechargeable batteries. "This is the first time anyone has been able to put together a functioning battery using ion soft-landing," said chemist and Laboratory Fellow Julia Laskin of the Department of Energy's Pacific Northwest National Laboratory (PNNL). The advantages come from soft-landing's ability to build an electrode surface very specifically with only the most desirable molecules out of a complex mixture of raw components. "It will help us unravel important scientific questions about this energy storage technology, a hybrid between common lithium rechargeable batteries and supercapacitors that have very high energy density," said lead author, PNNL chemist Venkateshkumar Prabhakaran. Although lithium ion rechargeable batteries are the go-to technology for small electronic devices, they release their energy slowly, which is why hybrid electric vehicles use gasoline for accelerating, and take a long time to recharge, which makes electric vehicles slower to "fill" than their gas-powered cousins. One possible solution is a hybrid battery that crosses a lithium battery's ability to hold a lot of charge for its size with a fast-charging supercapacitor. PNNL chemists wanted to know if they could make superior hybrid battery materials with a technology, called ion soft-landing, that intricately controls the raw components during preparation. To find out, Laskin and colleagues created hybrid electrodes by spraying a chemical known as POM, or polyoxometalate, onto supercapacitor electrodes made of microscopically small carbon tubes. Off-the-shelf POM has both positively and negatively charged parts called ions, but only the negative ions are needed in hybrid electrodes. Ion soft landing distributes negative POM ions (bright spots) evenly onto a supercapacitor, leaving unwanted positive ions behind. 4 Battery Power * Summer 2016 Limited by its design, the conventional preparation technique sprays both the positive and negative ions onto the carbon nanotubes. Ion soft-landing, however, sepa- Volume 20, Issue 2 Editor & Publisher David Webster Director of Content Nick Depperschmidt Senior Editor Shannon Given Associate Editor Heather Williams News Editors Robert Schaudt, Sue Hannebrink, Scott Webster Manager of Administration Marsha Grillo Director of Support Services Marc Vang BATTERY POWER (ISSN #1092-3616) is published bi-monthly by Webcom Communications Corp., 7355 E. Orchard, #100 Greenwood Village, CO 80111. A U.S. subscription is $58.00/ year and $72.00/year elsewhere. Single copies are $20 plus shipping. Back issues are available. Payment must be made in U.S. funds to process the order. Direct all subscription inquiries, orders and address changes to Fulfillment Services. Reprints/Photocopies: For requests contact Webcom Communications at 720-528-3770. © Copyright 2016 Webcom Communications Corp. Material in this publication may not be reproduced in any form without written permission. Requests for permission should be directed to the customer service manager. Webcom Communications Corp. 7355 E. Orchard Rd., Suite 100 Greenwood Village, CO 80111 Phone 720-528-3770 Fax 720-528-3771 Office hours: 7 a.m. to 5 p.m. MST

Table of Contents for the Digital Edition of Battery Power - Summer 2016

Toolbox Energy Storage Systems: Modeling, Simulating and Testing Battery Systems of (H)EVs
Enhancing Smartphone Battery Performance During GSM Pulses Through The Use of a Parallel Supercapacitor
ICs & Semiconductors
Charging Systems
Testing & Monitoring
Editor’s Choice
Research & Development
Conference Preview
Industry News
Calendar of Events

Battery Power - Summer 2016