Non-aqueous electrolyte lithium secondary battery
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMasaki Hasegawa, Yasuhiko Bito, Shuji Ito, Toshihide Murata, Yoshinori Toyoguchi
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Abstract
A non-aqueous electrolyte secondary battery having a low manufacturing cost and a high energy density and being excellent in the high rate charge/discharge characteristic and in the characteristics in operation at high temperature provided by an improvement on its positive electrode active material is disclosed. The positive electrode active material comprises a specific compound wherein a part of nickel or lithium in LiNiO.sub.2 is substituted with another element in a specified range. The element for the substitution comprises Mg, Ca, Sr, Ba, Al Cr, B and Co which may be employed solely or in combination.
Claims6
A non-aqueous electrolyte lithium secondary battery comprising a positive electrode, a negative electrode capable of absorbing and desorbing lithium in a reversible manner and a non-aqueous electrolyte, wherein said positive electrode comprises a compound represented by the formula Li.sub.x Ni.sub.1-y M.sub.y O.sub.2+z, where M represents at least one element selected from the group consisting of Mg, Ca, Sr and Ba, and 0.05.ltoreq.x.ltoreq.1.1, 0.01.ltoreq.y.ltoreq.0.3, and -0.3.ltoreq.z.ltoreq.0.1.
A non-aqueous electrolyte lithium secondary battery comprising a positive electrode, a negative electrode capable of absorbing and desorbing lithium in a reversible manner and a non-aqueous electrolyte, wherein said positive electrode comprises a compound represented by the formula Li.sub.x Ni.sub.1-y M.sub.y O.sub.2+z, where M is Al, and 0.05.ltoreq.x.ltoreq.1.1, 0.003.ltoreq.y<0.1, and -0.3.ltoreq.z.ltoreq.0.1.
A non-aqueous electrolyte lithium secondary battery comprising a positive electrode, a negative electrode capable of absorbing and desorbing lithium in a reversible manner and a non-aqueous electrolyte, wherein said positive electrode comprises a compound represented by the formula Li.sub.x Ni.sub.1-y (Al.sub.a B.sub.b Co.sub.c Mg.sub.d).sub.y O.sub.2+z, where 0.05.ltoreq.x.ltoreq.1.1, 0.01.ltoreq.y.ltoreq.0.3, -0.3.ltoreq.z.ltoreq.0.1, and (a+b+c+d).ltoreq.1, and any three or more of a, b, c and d are never 0 at the same time.
A non-aqueous electrolyte lithium secondary battery comprising a positive electrode, a negative electrode capable of absorbing and desorbing lithium in a reversible manner and a non-aqueous electrolyte, wherein said positive electrode comprises a compound represented by the formula Li.sub.1+x-y Al.sub.y NiO.sub.2+z, where -0.1.ltoreq.x.ltoreq.0.1, 0.01.ltoreq.y.ltoreq.0.2, and -0.3.ltoreq.z.ltoreq.0.2.
A non-aqueous electrolyte lithium secondary battery comprising a positive electrode, a negative electrode capable of absorbing and desorbing lithium in a reversible manner and a non-aqueous electrolyte, wherein said positive electrode comprises a compound represented by the formula Li.sub.1+x-y M.sub.y NiO.sub.2+z, where M represents at least one element selected from the group consisting of Mg and Ca, and -0.1.ltoreq.x.ltoreq.0.1, 0.01.ltoreq.y.ltoreq.0.2, and -0.3.ltoreq.z.ltoreq.0.1.
A non-aqueous electrolyte lithium secondary battery comprising a positive electrode, a negative electrode capable of absorbing and desorbing lithium in a reversible manner and a non-aqueous electrolyte, wherein said positive electrode comprises a compound represented by the formula Li.sub.1+x-y (Mg.sub.a Ca.sub.b Co.sub.c Al.sub.d).sub.y NiO.sub.2+z, where -0.1.ltoreq.x.ltoreq.0.1, 0.01.ltoreq.y.ltoreq.0.2, -0.3.ltoreq.z.ltoreq.0.2, and (a+b+c+d)=1, and any three or more of a, b, c and d are never 0 at the same time.
Dependencies are inferred from the claim text.