United Kingdom Atomic Energy Authority

William J Macklin

Robin J Neat

Richard J Hobson

Andrew Davies

Titanium dioxide-based material

A secondary cell includes as its active cathode material a first insertion material, such as V.sub.6 O.sub.13, into which ions are inserted during discharge. To prevent irreversible lattice changes leading to a decline in capacity the discharge should be terminated before a threshold cell voltage is crossed. Such irreversible changes are suppressed by including in a surface coating of the cathode a minor proportion of a second insertion material, such as a titanium oxide, whose discharge commences before the threshold cell voltage is reached.

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Oxford, United Kingdom

William J Macklin