Positive active material for rechargeable lithium batteries and method of preparing the same

   
   

A positive active material includes a core including a lithiated compound, and at least two surface-treatment layers formed on the core. The surface-treatment layer includes at least one compound selected from the group consisting of a coating-element-included hydroxide, a coating-element-included oxyhydroxide, a coating-element-included oxycarbonate, and a coating-element-included hydroxycarbonate. The coating element is selected from the group consisting of Mg, Al, Co, K, Na, Ca, Si, Ti, Sn, V, Ge, Ga, B, and As.

Um material ativo positivo inclui um núcleo including a lithiated o composto, e ao menos as duas camadas do superfície-tratamento dadas forma no núcleo. A camada do superfície-tratamento inclui ao menos um composto selecionado do grupo que consiste em um hydroxide revist-elemento-incluído, em um oxyhydroxide revist-elemento-incluído, em um oxycarbonate revist-elemento-incluído, e em um hydroxycarbonate revist-elemento-incluído. O elemento revestindo é selecionado do grupo que consiste em magnésio, al, Co, K, Na, CA, silicone, ti, sn, V, Ge, Ga, B, e como.

 
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