Transition metal-metaphosphate negative electrode active material, preparation method thereof, lithium secondary battery or hybrid capacitor containing it
A negative electrode active material and lithium secondary battery technology, applied in the direction of active material electrodes, hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, etc., to achieve the effects of improved conductivity, low average voltage, and excellent conversion reactivity
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[0060] The present invention provides the preparation method of transition metal-metaphosphate of above chemical formula 1, comprising: step (i), obtain the precursor that comprises transition metal compound and phosphate; The obtained precursor is subjected to heat treatment.
[0061] Specifically, the method for preparing a transition metal-metaphosphate according to an embodiment of the present invention may include a step of obtaining a precursor comprising a transition metal compound and a phosphate (step (i)).
[0062] The above-mentioned transition metal-containing compound and phosphate can be obtained as a precursor by mixing according to the stoichiometric equivalent. At this time, in order to mix the above-mentioned compounds to the maximum extent, it is preferable to obtain a homogeneously mixed precursor by a normal grinding method such as a planetary ball mill.
[0063] According to an embodiment of the present invention, in order to prepare the above-mentioned ...
Embodiment 1
[0106] Embodiment 1: Mn(PO 3 ) 2 preparation of
[0107] Mn(PO 3 ) 2 The synthesis of is carried out according to a common solid-phase reaction method in which precursors are mixed in a manner corresponding to the chemical equivalent and heat-treated.
[0108] MnO 2 and NH 4 h 2 PO 4 After quantifying at an equivalent of 1:2, a planetary ball mill was used to mix the above-mentioned substances as well as possible. After adding alumina balls and ethanol as a dispersion medium, grinding was performed at a speed of 350 rpm for one hour to obtain a precursor in which the raw materials were uniformly mixed.
[0109] Mn(PO 3 ) 2 .
Embodiment 2
[0110] Embodiment 2: preparation is coated with the Mn(PO of carbon layer 3 ) 2
[0111] The Mn(PO) prepared in the above-mentioned embodiment 1 3 ) 2 After being dispersed in sucrose solution and heated by microwave, the Mn(PO 3 ) 2 A carbon coating is formed on it.
[0112] Specifically, with Mn(PO 3 ) 2 Gross weight is a basis, after preparing the sucrose solution of about 60 weight percent, make above-mentioned Mn(PO 3 ) 2 Disperse in the prepared sucrose solution and stir for more than 30 minutes. Then, hydrolysis by means of microwave heat treatment was carried out at a temperature of 200°C. The above heat treatment was performed in argon as an inert atmosphere. Mn coated with a carbon layer by the above hydrolysis using water and ethanol 2 P 2 o 7 After several washes, carbon-coated Mn(PO 3 ) 2 .
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