Improvements in the Manufacture of Electric Accumulators or Secondary Batteries.
Year: 1896

page_text: Date of Application, 12th Dec., 1896
Complete Concification La
1000
Date of Application, 12th Dec., 1896
Complete Specification Left, 20th July, 1897-Accepted, 23rd Oct., 1897
VISIONAL
FICATION.
Improvements in the Manufacture of Electric Accumulators or
Secondary Batteries.
I, LORENZ LUCAS, of 37, Carlstrasse, Hagen, Westphalia, in the Empire of
Germany, Doctor of Philosophy, do hereby declare the nature of this invention
to be as follows:-
The process forming the subject of the present invention consists in forming cast
or rolled lead plates of any suitable shape in a mixture of sulphuric acid and
perchloric acid or their salts. By this means a firmly adhering layer of peroxide
of lead is formed on the positive plate whilst hydrogen is deposited on the negative
plate or there is discharged there an originally positively formed plate for the
purpose of transforming it into spongy lead. The perchloric acid has the advan-
tage over chlorine compounds such as chloric acid and hydrochloric acid, which
have been hitherto employed, that it is not affected by electrolysis so that no
chlorine is produced and the solution can be used over again whilst, when
employing chloric acid, the solution must be thrown away after being employed
once or twice.
Dated this 12th day of December 1896
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
Improvements in the Manufacture of Electric Accumulators or
Secondary Batteries.
I, LORENZ LUCAS, of 37, Carlstrasse, Hagen, Westphalia, in the Empire of
Germany, Doctor of Philosophy, do hereby declare the nature of this invention
and in what manner the same is to be performed, to be particularly described and
ascertained by the following statement:-
The process forming the subject of this invention consists in forming cast
or rolled lead plates of any suitable shape in a mixture of sulphuric acid and
perchloric acid or their salts. By this means a firmly adhering layer of peroxide
of lead is formed on the positive plate whilst hydrogen is deposited on the negative
plate or there is discharged there an originally positively formed plate for the
purpose of transforming it into spongy lead. The perchloric acid has the advan-
tage over chlorine compounds such as chloric acid and hydrochloric acid, which
have been hitherto employed, that it is not affected by electrolysis so that no
Price 8d1

page_text: chlorine is produced and the solution can be used over again whilst, when
employing chloric acid, the solution must be thrown away after being employed
once or twice.
In practice I find it advantageous to employ a mixture containing from about
5 to 10 grammes of free perchloric acid of which any of the salts may be used,
such for example, as perchlorate of potassium, sodium or calcium. The perchlorate
is added in such proportion to the sulphuric acid that the solution shall contain
about 5 to 10 grammes of perchloric acid liberated by the sulphuric acid.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. The described process of forming accumulator plates such process consisting
in employing therefor, instead of chloric acid, hydrochloric acid and the like, the
more stable perchloric acid or its salts substantially as described.
2. Accumulator plates manufactured as hereinbefore described.
da of T 1907
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.