전극 활물질

• Main Authors: LEWIS JOSHUA RHYS, MARTIN DANIEL ZIGGY CHADNEY, GROOMBRIDGE ALEXANDER SIMON
• Format: Patent
• Language: Korean
• Published: 10.07.2024
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

본 발명은, 예를 들어, 리튬 이온 또는 나트륨 이온 배터리에서 전극 활물질로 사용하기 위한 혼합상 산화물에 관한 것이다. 이러한 혼합상 산화물은 Nb 및 Ti 를 포함하고 M(III) 및/또는 M(II)를 추가로 포함하고; 이 때 M(III)는 Cr, Al, Ga, 및 이들의 혼합물에서 선택되고; M(II)는 Zn, Cu, Mg, 및 이들의 혼합물에서 선택되고; 여기서 혼합상 산화물은 제1 상 및 제2 상의 상호침투성 혼합물을 포함하고; 여기서 제1 상은 TiNb2O7의 결정 구조를 가지고 제2 상은 Zn2Nb34O87의 결정 구조를 갖는다. A mixed-phase oxide for use as an active electrode material, e.g. in anodes for Li-ion or Na-ion batteries, comprises Nb and Ti and further comprises M(III) and/or M(II); wherein M(III) is selected from Cr, Al, Ga, and mixtures thereof; and M(II) is selected from Zn, Cu, Mg, and mixtures thereof. The mixed-phase oxide comprises an interpenetrating mixture of a first phase and a second phase; wherein the first phase has the crystal structure of TiNb2O7 and the second phase has the crystal structure of Zn2Nb34O87. Preferably, the weight ratio of the first phase to the second phase is 199:1 to 1:1, most preferably 50:1 to 8:1. The first phase may comprise at least 85 wt% of the mixed-phase oxide. The mixed-phase oxide is preferably particulate, optionally with a D50 particle diameter between 0.1-100 µm. The mixed-phase oxide may also include one or more additional elements, such as Zr, V, Fe, Mo, W and P to substitute for a metal, as well as at least one electronegative element such as a halide, N, S or Se to substitute for oxygen. The interpenetrating mixture is preferably not a core/shell structure, and may be coated with carbon.