scispace - formally typeset
Search or ask a question
Author

K. Mueller

Bio: K. Mueller is an academic researcher from Paul Scherrer Institute. The author has an hindex of 1, co-authored 1 publications receiving 99 citations.

Papers
More filters

Cited by
More filters
Journal ArticleDOI
TL;DR: Two organic salts, Li(2)C(8)H(4)O(4), with carboxylate groups conjugated within the molecular core, with enhanced thermal stability over carbon electrodes in 1 M LiPF(6) ethylene carbonate-dimethyl carbonate electrolytes, which should result in safer Li-ion cells.
Abstract: Present Li-ion batteries for portable electronics are based on inorganic electrodes. For upcoming large-scale applications the notion of materials sustainability produced by materials made through eco-efficient processes, such as renewable organic electrodes, is crucial. We here report on two organic salts, Li2C8H4O4 (Li terephthalate) and Li2C6H4O4(Li trans-trans-muconate), with carboxylate groups conjugated within the molecular core, which are respectively capable of reacting with two and one extra Li per formula unit at potentials of 0.8 and 1.4 V, giving reversible capacities of 300 and 150 mA h g-1. The activity is maintained at 80 °C with polyethyleneoxide-based electrolytes. A noteworthy advantage of the Li2C8H4O4 and Li2C6H4O4 negative electrodes is their enhanced thermal stability over carbon electrodes in 1 M LiPF6 ethylene carbonate-dimethyl carbonate electrolytes, which should result in safer Li-ion cells. Moreover, as bio-inspired materials, both compounds are the metabolites of aromatic hydrocarbon oxidation, and terephthalic acid is available in abundance from the recycling of polyethylene terephthalate.

870 citations

Journal ArticleDOI
TL;DR: This review provides a comprehensive overview of novel battery systems and discusses the numerous classes of organic, polymer-based active materials as well as auxiliary components of the battery, like additives or electrolytes.
Abstract: The storage of electric energy is of ever growing importance for our modern, technology-based society, and novel battery systems are in the focus of research. The substitution of conventional metals as redox-active material by organic materials offers a promising alternative for the next generation of rechargeable batteries since these organic batteries are excelling in charging speed and cycling stability. This review provides a comprehensive overview of these systems and discusses the numerous classes of organic, polymer-based active materials as well as auxiliary components of the battery, like additives or electrolytes. Moreover, a definition of important cell characteristics and an introduction to selected characterization techniques is provided, completed by the discussion of potential socio-economic impacts.

825 citations

Journal ArticleDOI
TL;DR: A new type of safe, fast, inexpensive, long-life aqueous electrolyte battery, which relies on the insertion of potassium ions into a copper hexacyanoferrate cathode and a novel activated carbon/polypyrrole hybrid anode and an electrochemically active additive to tune its potential.
Abstract: New types of energy storage are needed in conjunction with the deployment of solar, wind and other volatile renewable energy sources and their integration with the electric grid. No existing energy storage technology can economically provide the power, cycle life and energy efficiency needed to respond to the costly short-term transients that arise from renewables and other aspects of grid operation. Here we demonstrate a new type of safe, fast, inexpensive, long-life aqueous electrolyte battery, which relies on the insertion of potassium ions into a copper hexacyanoferrate cathode and a novel activated carbon/polypyrrole hybrid anode. The cathode reacts rapidly with very little hysteresis. The hybrid anode uses an electrochemically active additive to tune its potential. This high-rate, high-efficiency cell has a 95% round-trip energy efficiency when cycled at a 5C rate, and a 79% energy efficiency at 50C. It also has zero-capacity loss after 1,000 deep-discharge cycles.

490 citations

Patent
Zoran Radivojevic1, Paul Beecher1, Chris Bower1, Piers Andrew1, Darryl Cotton1, Samiul Haque1 
16 Aug 2012
TL;DR: In this paper, an apparatus including a plurality of adjacent repeated base units, each base unit formed from an active electrode of first, second, third and third touch sensor arrays, each including an active electrodes connected to a respective common terminal of the touch sensor array, where a swipe touch gesture applied to two or more adjacent active electrodes of the apparatus generates signalling at the respective common terminals of the corresponding touch sensors.
Abstract: An apparatus including a plurality of adjacent repeated base units, each base unit formed from an active electrode of first, second and third touch sensor arrays, the first, second and third touch sensor arrays each including a plurality of active electrodes connected to a respective common terminal of the touch sensor array, wherein each base unit includes an active electrode of the second touch sensor array interlaced between an active electrode of the first touch sensor array and an active electrode of the third touch sensor array such that a swipe touch gesture applied to two or more adjacent active electrodes of the apparatus generates signalling at the respective common terminals of the corresponding touch sensor arrays which allows the direction of the swipe touch gesture to be determined.

383 citations

Journal ArticleDOI
TL;DR: It is suggested that bipolar porous organic electrode provides a new material platform for the development of a rechargeable energy storage technology and would significantly enhance cost-effectiveness, and reduce the dependency on limited natural resources.
Abstract: A huge demand for lithium batteries necessitates more affordable alternatives. Sakaushi et al. describe rechargeable sodium batteries containing organic electrodes with a porous-honeycomb structure that are comparable to lithium batteries and capable of over 7,000 cycles.

307 citations