(US5173215-A)      Compsn. comprises Ti sub-oxide of formula TinO2n-1, where n is at least 4, in the form of particles as a magnetic phase. The particles have a dia. of at least 1 micron and a surface area of less than 0.2 m2/g.    The particles pref. have an aspect ratio of 1 and a surface area of up to 0.1 m2/g. The Ti sub-oxide is produced by heating TiO2 and annealing.    USE/ADVANTAGE -   Used as electrode materials in liq. electrolytes. The Ti sub-oxide has good resistance to degradation    (US5281496-A)      The electrochemical cell has one electrode formed of particulate titanium suboxide of formula TinO2n-1, where n is at least 4. The particles are present as a Magneli phase and have a dia. of about one micron and a surface area below 0.2 sq.m/g.    USE/ADVANTAGE -   Storage batteries, fuel cells, corrosion resistant films, and in metal-winning systems. The electrodes are resistant to the effects of fluoride ions and have a low oxygen overvoltage. The materials can be included in a polymeric binder.    (JP6505469-W)      A compsn. consists of titanium suboxide of the formula TinO2n-1, where n is at least 4, in particulate form as a Magneli phase. The particles have an aspect ratio of about 1, a dia. of at least 1 micron, and a surface area of less than 0.2 m2/g.    Method of producing the titanium suboxide particles comprises: a) heating the TiO2 at a temp. exceeding 1000 deg.C in the presence of a reducing agent for a time sufficient to form a Magneli phase, but minimise the formation of Ti4O7, and species contg. less oxygen, and b) annealing the reduced compsn. by exposing the material at a temp. of 1100-1300 deg. C in an inert atmos. contg. no nitrogen or oxygen, in the presence of 1-5% hydrogen for about 2-4 hours.    The invention pref. comprises an electrochemical cell including an electrolyte, with an electrode comprising sub-stoichiometric titanium oxide particulate of the present invention, disposed in the electrolyte. The electrode pref. comprises the particulate dispersed in a non-electrically conducting matrix material.    USE/ADVANTAGE -   The particulate compsn. is partic. stable when immersed in electrolytes and is satisfactorily conductive, and therefore finds applications as electrodes and substrates for electrodes, including conductivity aids in corrosive environments. In particular, the particulate compsn. is for use in electrical storage batteries and fuel cells, corrosion resistant films, and large industrial metal-winning electrodes.