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h i m u r a C e n t r a l R e s e a r c h L a b o r a t o r y o f Sumitomo M e t a l Mlning C o . , L t d . Nakakokubun 3-18-5, I c h ikava-Shl. Ch i b a 272. J a p a n * P r e s e n t A d d r e s s D e p a r t m e n t of M e t a l l u r g y and M a t e r i a l s E n g i n e e r i n g , L e h i g h U n l v e r s l t y . B e t h l e h e m , PA 18015. U.S.A. Abstract An a p p l i c a t i o n o f a f a s t h e a t i n g p r o c e s s a t t a i n s a r e m a r k a b l y h i g h Q v a l u e of t h e p u r e BMT (Ba(Mg1/3Ta2,3)03) c e r a m i c s . Q v a l u e s t r o n g l y d e p e n d s on t h e o r d e r i n g of t h e B s i t e i o n s and t h e d e n s l t y of t h e c e r a m i c s b u t n o t on t h e g r a i n s i z e . I t is found t h a t t h e The maximum Q v a l u e i s o b t a i n e d f o r t h e h i g h d e n s i t y a n d h l g h o r d e r , which a t t a i n s more t h a n 35000 a t 10CHz. I . I n t r o d u c t i o n R e c e n t l y complex p e r o v r k i t e compounds v i t h the g e n e r a l f o r m u l a A

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The interfacial reactions, especially the gas evolution, between carbon conductive agents and the electrolyte at the positive electrode in high-voltage batteries (potentials over 4.5 V) have been investigated. The amount of gas generated was quantified for various conductive agents: acetylene black (AB), furnace black, specially customized AB, and graphite (GR). The experiments revealed that in the high-voltage system, the specific gas evolution was induced by both the cathode active material and the conductive agent, with the carbon conductive agents resulting in the generation of 8 to 15 times more gas than the cathode active material LiNi 0.5 Mn 1.5 O 4 (LNMO) itself. The high-voltage properties of the carbon conductive agents, such as the anion intercalation and self-discharging properties, were evaluated for each carbon electrode. The results implied the existence of a local battery composed of the conductive agent and LNMO; this redox couple appears to play a key role in the gas evolution.

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