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LAYERED CORE.SHELL CATHODE ACTIVE MATERIALS FOR LITHIUM SECONDARY BATTERIES, METHOD FOR PREPARING THEREOF AND LITHIUM SECONDARY BATTERIES USING THE SAME
LAYERED CORE.SHELL CATHODE ACTIVE MATERIALS FOR LITHIUM SECONDARY BATTERIES, METHOD FOR PREPARING THEREOF AND LITHIUM SECONDARY BATTERIES USING THE SAME
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机译:用于锂二次电池的层状CORE.SHELL阴极活性材料,使用其制备方法和锂二次电池
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摘要
Disclosed herein is a layered core-shell cathode active material for secondary lithium batteries, in which the core layer has a structural formula of LiSUB1+a/SUB[MSUBx/SUBMnSUB1-x/SUB]SUB2/SUBOSUB4 /SUB(M is selected from a group consisting of Ni, Co, Mg, Zn, Ca, Sr, Cu, Zr, P, Fe, Al, Ga, In, Cr, Ge, Sn and combinations thereof, 0.01=x=0.25, 0=a=0.1) and the shell layer has a structural formula of LiSUB1+a/SUB[MSUBy/SUBMnSUB1-y/SUB]SUB2/SUBOSUB4 /SUB(M' is selected from a group consisting of Ni, Mg, Cu, Zn and combinations thereof, 0.01=y=0.5, 0=a=0.1). In the layered cathode active material, the core layer, corresponding to a 4V spinel-type manganese cathode, functions to increase the capacity of the active material while the shell layer, corresponding to a 5 V spinel-type transition metal mix-based cathode, is electrochemically stable enough to prevent the reaction of the components with electrolytes and the dissolution of transition metals in electrolytes, thereby improving thermal and lifetime characteristics of the active material.
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机译:本文公开了一种用于二次锂电池的层状核-壳正极活性材料,其中所述核层具有结构式为Li 1 + a SUB> [M x SUB> Mn 1-x SUB>] 2 SUB> O 4 SUB>(M选自Ni,Co,Mg,Zn,Ca,Sr,Cu,Zr ,P,Fe,Al,Ga,In,Cr,Ge,Sn及其组合(0.01 <= x <= 0.25,0 <= a <= 0.1),并且壳层的结构式为Li 1 + a SUB> [M y SUB> Mn 1-y SUB>] 2 SUB> O 4 SUB>(选择M'选自由Ni,Mg,Cu,Zn及其组合组成的组中,0.01 <= y <= 0.5,0 <= a <= 0.1)。在层状阴极活性材料中,对应于4V尖晶石型锰阴极的芯层起到增加活性材料容量的作用,而对应于5V尖晶石型过渡金属混合物基阴极的壳层则起到提高活性材料的能力的作用,其在电化学上足够稳定,以防止组分与电解质反应以及过渡金属在电解质中的溶解,从而改善了活性材料的热和寿命特性。
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