(DE4090275-C)      Active substance for the +ve electrode of a solid Li accumulator is a cpd (V2O5)x-(A)y.zH2O; as active substance for the -ve electrode Li(alloy) and as electrolyte a cpd ((N=P(E)2)(Lix)a)b. The No of recurring oligo ethoxy or oligo propoxy chains is pref 0-10.5. x+y=1, y=0.03-0.5; z=0.1-1.6; A= g GeO2, WO3, TeO2, CrO8; (N=P(E)2)= an oligophosphazene contg randomly arranged segments -(N=P(Q)2)p-, -(N=P(Q')2)m- and -(N=P(Q)(Q')n-; Q = -O(CH2CH2O)hCH2CH2CH2SO3M; Q'= -O(CH2CH2O)KR; X = an anion pref. e.g. CF3SO3, NCS-, COO Cl gp 1 or 2 metal; each R = Me, Et or propyl; h= 0-15; k = 0-22.5; a = 0.001-4; b = p+m+n; p, m and n = O or an integer; and p+m+n = 3-200,000.    ADVANTAGE -   High energy density electrode at ambient temp; soiling due to leaking of a liq electrolyte is avoided; efficiency redn and short circuits due to dendrite formation are eliminated.    (17pp)    (US5114809-A)      An all solid-state lithium sec. battery comprising an oxide of layer structure serving as a positive electrode active substance and of formula (V2O5)x.(A)y.zH2O, where x+y = 1, 0.03 to 0.5, z = 0.1 to 1.6, A is (GeO2, SiO2, B2O3, MoO3, WO3, Nb2O5, TeO2, Bi2O3, etc. Li or Li alloy serving as a negative electrode active substance and a cpd. serving as an electrolyte and of formula ((N=P(E)2).(LiX)a)b where i) (N = P(E)2) is an oligoethyleneoxy polyphosphazene having a sulphone gp. and comprising pref. arrangement of segments of formula (I), (II) and (III) or a mixt. of polyphosphazenes. (ii) X is an anion, (iii) M is metal from Gp I and II, (iv) R and R1 are methyl, ethyl, or propyl, (v) h and k are the average members of repeating ethyleneoxy units and are in the range h = 0-15 and k = 0-22.5, (vi) as in the ratio of (LiX) to (N=P(E)z) and is 0.001-4 (vii) l, m and n are each 0 or a positive integer in range l + m + n = 3-2000000 and l+n is not 0.    USE/ADVANTAGE -   Useful as a sec. battery having high energy density.    (JP2759479-B2)      A all solid-state secondary Li battery comprises a positive electrode active material (1), a negative electrode active material (3) and an electrolyte (2). (1) is a layered oxide of formula (I) (V205)x (A)y zH20 (I) where x + y = l, y = 0.03 - 0.5, z = 0.1 - 1.6; A is Ge02, Si02, B203, Mo03, W03, Nb205, Te02, Bi203, Cr306 or Zr02. (3) is Li or an Li alloy. (2) is a cpd of formula ((N=P(E)2).(LiX)a)b. where (N=p(E)2) is an oligoethyleneoxy polyphosphazene cpd having sulphone gps (4). (4) contain segments represented by formule (II), (III), (IV) where X is an anion; M is a metal of gp I or II or the periodic table; R and R' are independently CH3-, C2H5- or C3H7-; h and k are the mean repeat numbers of the ethyleneoxy unit; h = 0 to 15, k = 0 to 22.5 a represents the ratio (LiX)/(N=P(E)2) and is 0.001-4. l, m, n are independently 0 or positive integers and satisfy the relations b = l + m + n is 3 to 200000, l + n is not 0.    ADVANTAGE -   Having a high energy density.