Improvements in the Manufacture of Electrodes for Voltaic Batteries.
Year: 1895

page_text: Date of Application, 4th Sept., 1895
Complete Specification Left, 28th May, 1896-Accepted, 29th Aug., 1396
Date v Application, in dept., Toyo
Complete Specification Left, 28th May, 1896-Accepted, 29th Aug., 1896
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Electrodes for Voltaic
Batteries.
1, LUDWIG EPSTEIN, of Rosebank, Park Road, East Twickenham, in the
County of Middlesex, Electrical Engineer, do hereby declare the nature of this
invention to be as follows:-
11
My invention relates to the manufacture of electrodes for voltaic batteries,
applying chiefly to those of plate form for use in secondary batteries, the object
which have in view being to avoid the use of any detachable material and to
obtain plates of high capacity. For this purpose, I first prepare the surfaces of
lead plates in such a manner as to render them capable of being impregnated with
liquid. Modes of so preparing them are described in my previous Specification
No. 350 of 1890, but any other known mode may be adopted. I then serve the
surfaces so prepared with a mixture, which may be wholly or partly solution, of
lead oxide and caustic alkali, and dry them. I convert these plates into negative
electrodes by connecting them to the negative pole of a suitable source of
electricity while they are immersed in an electrolyte, which may be dilute sulphuric
acid, or a solution of a suitable salt. For converting the plates into positive
electrodes, I subject them to the action of acid preferably sulphuric acid or other
suitable solution so as to neutralise the alkali, and dry them, and, after repeating
this several times, I connect them to the positive pole of a suitable source of
electricity in the acid electrolyte.
The conversion of the plates to positive and negative respectively may be
effected simultaneously in an electrolyte of dilute sulphuric acid or of a suitable
sulphate solution, the plates being connected respectively to the positive and
negative poles of the source of electricity.
Although I have mentioned plates as the form of the electrodes produced as
above described, obviously bodies of other forms may be thus converted into
electrodes.
Dated this 4th day of September 1895.
ABEL & IMRAY,
Agents for the Applicant.
Improvements in the Manufacture of Electrodes for Voltaic
Batteries.
I, LUDWIG EPSTEIN, of Rosebank, Park Road, East Twickenham, in the
County of Middlesex, Electrical Engineer, do hereby declare the nature of this
invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement :-
My invention relates to the manufacture of electrodes for voltaic batteries,
applying chiefly to those of plate form for use in secondary batteries, the object
which I have in view being to avoid the use of material such as is liable to become
1 Price Rd1

page_text: detached, and to obtain plates of high capacity. For this purpose, I first prepare
the surfaces of lead plates in such a manner as to give them certain porosity and
render them capable of being impregnated with liquid. Modes of so preparing
plates are described in my previous Specification No. 350 of 1890, but any other
known mode may be adopted.
I then serve the surfaces so prepared with a mixture, which may be wholly or
partly solution, of any of the oxides of lead and caustic alkali, and dry them.
I find a suitable proportion of mixture such that at least half of the lead oxide
is in solution in the caustic alkali which is in the condition of saturated solution.
I convert these plates into negative electrodes by connecting them to the
negative pole of a suitable source of electricity while they are immersed in an
electrolyte, which may be dilute sulphuric acid, or a solution of a suitable salt
such as a soluble sulphate or sulphite of an alkali or an earth. For converting
the plates into positive electrodes, I first subject them to the action of acid,
preferably sulphuric acid or it may be sulphurous acid or a suitable solution such
as magnesium sulphate, so as to neutralise the alkali, and dry them, and, after
repeating this several times, I connect them to the positive pole of a suitable
source of electricity, while they are immersed in the acid electrolyte above
mentioned.
The conversion of the plates to positive and negative respectively may be effected
simultaneously in the electrolyte mentioned, the plates being connected respectively
to the positive and negative poles of the source of electricity.
I find it is of advantage to make all the plates negative in the first instance,
and then, having dried some of them I render these positive by connecting them
to the positive pole of a source of electricity while they are immersed in the
electrolyte.
Although I have mentioned plates as the form of the electrodes produced as
above described, obviously bodies of other forms may be thus converted into
electrodes.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
The herein described manufacture of electrodes for voltaic batteries by rendering
the surface of lead plates or pieces porous, serving them with a lead oxide and
caustic alkali, drying, and finally converting into negative and positive in the
manner described.
Dated this 28th day of May 1896
ABEL & IMRAY,
Agents for the Applicant.