Manganese dioxide positive electrode for rechargeable cells,...

H - Electricity – 01 – M

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

H01M 2/16 (2006.01) H01M 4/24 (2006.01) H01M 4/62 (2006.01) H01M 10/24 (2006.01) H01M 10/26 (2006.01) H01M 10/28 (2006.01) H01M 10/52 (2006.01) H01M 4/02 (2006.01) H01M 4/04 (2006.01) H01M 4/38 (2006.01) H01M 4/75 (2006.01) H01M 10/36 (2006.01) H01M 4/50 (2006.01)

Patent

CA 2157174

This invention teaches rechargeable manganese dioxide cells (10,40) having alkaline electrolytes, zinc negative electrodes (14) and manganese dioxide positive electrodes (18). In keeping with the present invention, the positive electrode is essentially unconstrained - that is, no cage is used in the cell to confine the positive electrode. During discharge of a rechargeable alkaline cell, the positive electrode may be inclined to contract or reduce its dimensions. However, the positive electrode is dimensioned so as to substantially fill the entire space allotted for it within the cell, while allowing for a slight accomodation for height-wise or longitudinal expansion or growth in bobin cells. The positive electrode may include additives such as carbon or graphite to increase its electrical conductivity, and hydrophobic agents such as PFTE, polyethylene or polypropylene to enhance the hydrogen permeability of the positive electrode and thereby lead to increased hydrogen recombination rates. Moreover, the discharge capacity of the negative electrode may be established so as to be in the range of from about 60% to about 120% of the theoretical one electron discharge capacity of the positive MnO2 electrode.

Cette invention concerne des piles rechargeables au dioxyde de manganèse (10, 40), ayant des électrolytes alcalins, des électrodes négatives au zinc (14) et des électrodes positives au dioxyde de manganèse (18). Dans cette invention, l'électrode positive est pratiquement sans contrainte, c'est-à-dire que la pile ne contient aucun système visant à confiner l'électrode positive. Au cours de la décharge d'une pile alcaline rechargeable, l'électrode positive peut avoir tendance à se dilater, et au cours du cycle de charge elle peut avoir tendance à se contracter ou à réduire ses dimensions. L'électrode positive est cependant dimensionnée de manière à pratiquement remplir tout l'espace qui lui est réservé dans la pile, tout en pouvant s'adapter à un léger accroissement de ses dimensions. L'électrode positive peut comprendre des additifs comme le carbone ou le graphite, afin d'accroître sa conductivité électrique, et des agents hydrophobes comme le PTFE, le polyéthylène ou le polypropylène, afin d'améliorer la perméabilité de l'électrode positive à l'hydrogène et ainsi d'obtenir des taux de recombinaison de l'hydrogène plus importants. De plus, la capacité de décharge de l'électrode négative peut être déterminée de manière à se trouver dans la gamme allant d'environ 60 à environ 120 % de la capacité de décharge théorique à un électron de l'électrode positive de MnO2.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Manganese dioxide positive electrode for rechargeable cells,... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Manganese dioxide positive electrode for rechargeable cells,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Manganese dioxide positive electrode for rechargeable cells,... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-2041437

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.