Improvements in Secondary Electric Batteries.
Year: 1887

page_text: Date of Application, 19th May, 1887
Complete Left, 16th Feb., 1888
Complete Accepted, 16th Mar., 1888
Improvements in Secondary Electric Batteries.
'
We, JAMES KYNOCH, of 7 Bank Buildings Church Street, Camberwell, in the
County of Surrey, and WILLIAM HABGOOD, of Hazlebrook Cottage, Buccleuch Road,
West Dulwich, in the County of Surrey, Electricians do hereby declare the nature of
this invention to be as follows :-
This invention relates to the manufacture of plates and masses composed chiefly
of peroxide of lead in a hard and coherent form suitable for use as negative elements
in reversible batteries without contact with any oxidizable metal or material. We
take one or more of the oxides of lead in powder other than the peroxide and inter-
mix it (or them) with substances either liquid or solid or both which will peroxidize the
lead oxide or oxides and cause it (or them) to set and become hard and coherent.
The substances we use are Chromic Acid, Potassic, or Sodic Permanganates, or any
acid or salt which alone, or in conjunction with a suitable acid, (e.g. Sulphuric or
Hydrochloric acids) will act chemically on the oxide or oxides and peroxidize it (or
them) and cause it (or them) to set and become hard and coherent. In making our
plates we take one or more of the oxides of lead and mix with one or more of the
above mentioned substances; for example Potassic Permanganate and Sulphuric acid
which together act chemically on the lead oxide or oxides, and peroxidize it (or them)
more or less perfectly the mixture eventually; i.e. when the peroxidation is almost
complete; becoming a plastic mass, which is immediately put into a suitable mould
and subjected to great pressure to consolidate the mass. To obtain good contact with
the peroxide of lead element we embed in the plastic mass of which the element is
manufactured one or more wires or perforated strips of platinum or other non-
oxidizable metal. With a view to further increase the conductivity of our plates or
elements we add to the lead oxide, or oxides, before mixing with the peroxidizing
agents a certain proportion of powdered plumbago. Our negative elements may be
perforated to increase the discharge of the elements when in use.
Our negative
elements may be used with a positive element of spongy lead in an electrolyte of
dilute sulphuric acid.

page_text: www.
We, JAMES KYNOOH of 7 Bank Buildings, Church Street, Camberwell, London,
S.E. and WILLIAM HABGOOD of Hazelbrook Cottage, Buccleuch Road West Dulwich,
London, 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 :-
--
This invention relates to the manufacture of plates and masses composed chiefly
of peroxide of lead in a hard and coherent form, suitable for use as negative
elements in Secondary Electric Batteries without contact with any oxidisable metal or
material.
We take one or more of the oxides of lead in powder, other than the peroxide, and
intermix it (or them) with substances, either liquid or solid or both, which will
peroxidise the lead oxide or oxides and cause it (or them) to set and become hard and
coherent. The substances we use are:-Chromic Acid, Potassic or Sodic perman-
ganates, or any acid or salt which, alone, or in conjunction with a suitable acid will
act chemically on the oxide or oxides and peroxidise it (or them) and cause it (or
them) to set and become hard and coherent.
In making our plates we take one or more of the oxides of lead and mix with one
or more of the above mentioned substances, e.g. Potassic Permanganate and Sulphuric
Acid which together act chemically on the lead oxide or oxides and peroxidises it (or
them) more or less perfectly, the mixture eventually, (i.e. when the peroxidation is
almost complete) becoming a plastic mass, which is immediately put into a suitable
mould and subjected to great pressure to consolidate the mass. To obtain good contact
with the peroxide of lead element we embed in the plastic mass of which the element
is manufactured one or more perforated strips of platinum, or other non-oxidisable
metal. With a view to further increase the conductivity of our plates or elements we
add to the lead oxide or oxides before mixing with the peroxidising agents, a certain
proportion of powdered plumbago. Our negative element may be perforated to
increase the discharge when in use.
Our negative element may be used with a positive element of spongy lead in an
electrolyte of dilute sulphuric acid.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what we
claim is :-
:-
1. In the manufacture of peroxide of lead elements the production of a hard and
coherent plate or mass, by making a suitable acid or salt, separately or together, act
chemically on one or more of the oxides of lead, in such a manner as to peroxidise it
(or them) and cause it (or them) to become hard and coherent.
2. The mixing of plumbago with the oxide or oxides of lead used in making the
peroxide element.