Central Glass Company, Limited

Koji Nozaki

Yasushi Kita

Masayuki Kawaguchi

Kayoko Yamamoto

Metal containing compounds having a graphite-like layer structure are derived from poly(amino-s-triazine), [A], which has a layer structure and is represented by (C.sub.3 N.sub.3).sub.2 N.sub.x H.sub.y, where 2.ltoreq.x.ltoreq.4, and 0.ltoreq.y.ltoreq.8. Reaction of [A] with a transition metal M at 400.degree.-1000.degree. C. gives a compound represented by C.sub.a NH.sub.b M.sub.c, where 0.6.ltoreq.a.ltoreq.20.0, 0.ltoreq.b.ltoreq.1.0, and 0.001.ltoreq.c.ltoreq.0.5. This compound exhibits magnetism. Reaction of [A] with a halide of a transition metal or aluminum at 200.degree.-500.degree. C. gives C.sub.6 N.sub.p H.sub.q M.sub.r X.sub.s, where M is a transition metal or Al, X is a halogen, 8.ltoreq.p.ltoreq.10, 0.ltoreq.q.ltoreq.10, 0.6.ltoreq.r.ltoreq.1.5, and 0.ltoreq.s.ltoreq.1. When M is a transition metal the compound exhibits paramagnetism. When X is Al, heating of a powder of the compound at 800.degree.-950.degree. C. provides an AlN powder coated with an amorphous organic substance composed of C, N and H and, hence, protected against oxidation. The same coated AlN powder is obtained also by reacting a powder of [A] with an aluminum halide at 800.degree.-950.degree. C. By heating the coated AlN powder at a temperature above 1000.degree. C. the amophous organic coating sublimates and decomposes to leave a pure AlN powder which is suitable for sintering.

Metal containing derivatives of aminotriazine polymer and method of

The invention provides a lithium secondary battery using hydric boron carbonitride which is a layered compound represented by BC.sub.x N.sub.y H.sub.z, where 0.5.ltoreq.x.ltoreq.12, 0.7.ltoreq.y.ltoreq.1.5, and 0.01.ltoreq.z.ltoreq.3, as the active material of the negative electrode. This compound is obtained by a CVD process. The electrolyte is a solution of a lithium salt in an organic solvent. The material of the positive electrode is an oxide such as MnO.sub.2 or V.sub.2 O.sub.5, a sulfide such as MoS.sub.2 or TiS.sub.2 or a conductive organic polymer such as polyaniline. In this secondary battery Li is smoothly intercalated in and released from the hydric boron carbonitride of the negative electrode, and the energy density with respect to the active material of the negative electrode is sufficiently high. This battery bears a fairly large number of charge-discharge cycles. Also it is possible to use hydric boron carbonitride as the active material of the positive electrode of a lithium secondary battery in combination with negative electrode of metallic Li or hydric boron carbonitride with intercalation of a larger amount of Li.

Lithium secondary battery using hydric boron carbonitride as electrode

A polymeric compound, named poly(amino-s-triazine), which has a layer structure with a structural unit represented by (C.sub.3 N.sub.3).sub.2 N.sub.x H.sub.y, where 2.ltoreq.x.ltoreq.4 and 0.ltoreq.y.ltoreq.8, is obtained by reaction of cyanuric trichloride with ammonia or melamine. This compound is stable in the air up to about 400.degree. C. and exhibits fluorescence by excitation at wavelength of 365 nm. When the above reaction is carried out at a temperature ranging from room tempertaure to about 400.degree. C. the product is an oligomeric compound (C.sub.3 N.sub.3).sub.a (NH).sub.b (NH.sub.2).sub.c Cl.sub.d, where 2.ltoreq.a.ltoreq.10, 1.ltoreq.b.ltoreq.10, 0.ltoreq.c.ltoreq.11 and 1.ltoreq.d.ltoreq.12, and poly(amino-s-triazine) is obtained by heating the oligomeric compound at 400.degree.-600.degree. C. in an inactive gas. The oligomeric compound too exhibits fluorescence and is higher in fluorescence intensity. An alkali metal ion can be introduced into poly(amino-s-triazine) by treatment with an alkali metal hydroxide solution, or hydroxyl group can be introduced by treatment with a mineral acid. In either case the modified polymer is very higher in fluorescence intensity and narrower in the width of flurorescence peak.

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Yamaguchi, Japan

Koji Nozaki