Active substance
A technology of active substances and active materials, applied in niobium compounds, climate sustainability, electrolyte battery manufacturing, etc., can solve problems such as difficulty in reducing electrode potential energy density, and achieve excellent high current performance, cycle performance, and high capacity.
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no. 1 approach
[0024] According to a first embodiment, an active substance is provided. The active material includes secondary particles and a carbon material phase formed on at least a portion of a surface of each of the secondary particles. Each of the secondary particles is composed of agglomerated active material primary particles. The primary particles of active materials include Li x m (1-y) Nb y Nb 2 o (7+δ) A niobium composite oxide, wherein M is at least one selected from Ti and Zr, and x, y, and δ satisfy 0≤x≤6, 0≤y≤1, and -1≤δ≤1, respectively. The compression burst strength of the secondary particles is 10 MPa or higher.
[0025] Formula Li x m (1-y) Nb y Nb 2 o (7+δ) The indicated niobium composite oxide can provide a battery capable of stably repeating rapid charge and discharge without impairing rate performance and energy density for the reasons described below.
[0026] The following will refer to figure 1 and 2 An example of a crystal structure of a niobium com...
no. 2 approach
[0101] According to a second embodiment, a method of producing an active substance is provided. Active species include Li x m (1-y) Nb y Nb 2 o (7+δ) A niobium composite oxide, wherein M is at least one selected from Ti and Zr, and x, y, and δ satisfy 0≤x≤6, 0≤y≤1 and -1≤δ≤1, respectively. The method includes: providing a niobium composite oxide according to a solid phase reaction; grinding the niobium composite oxide to provide a ground product; forming the ground product into secondary particles; sintering the secondary particles; a surface of a sintered secondary particle, formed including the secondary particle and the carbon precursor; and the carbonized carbon precursor.
[0102] Hereinafter, a method of producing an active substance according to the second embodiment is explained.
[0103] First, for example, as described below, a niobium composite oxide is obtained by a solid phase reaction. However, the method of obtaining the niobium composite oxide is not lim...
no. 3 approach
[0117] According to a third embodiment, there is provided a nonaqueous electrolyte battery. The nonaqueous electrolyte battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The negative electrode includes the active material according to the first embodiment.
[0118] The nonaqueous electrolyte battery according to the third embodiment may further include a separator provided between the positive electrode and the negative electrode, a container containing the positive electrode, the negative electrode, the separator, and the nonaqueous electrolyte, a positive terminal, and a negative terminal. The positive electrode can be spatially separated from the negative electrode in such a manner that a separator is sandwiched between the electrodes. The negative terminal can be electrically connected to the negative electrode. The positive terminal can be electrically connected to the positive electrode.
[0119] Hereinafter, the container, nega...
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Abstract
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