Transition metal-pyrophosphate anode active material and anode comprising same
A negative electrode active material and transition metal technology, applied in the direction of active material electrodes, phosphate, negative electrodes, etc., to achieve the effect of improving conductivity, improving capacity characteristics, and low average voltage
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[0061] The present invention provides the preparation method of the transition metal-pyrophosphate of the above chemical formula 1, comprising: step (i), obtaining a precursor comprising a transition metal compound and phosphate; and step (ii), for the above step (i) The obtained precursor is subjected to heat treatment.
[0062] Specifically, the method for preparing a transition metal-pyrophosphate 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)).
[0063] 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 as well as possible, it is preferable to obtain a homogeneously mixed precursor by a normal grinding method such as a planetary ball mill.
[0064] According to an embodiment of the present inventio...
Embodiment 1
[0107] Example 1: Mn 2 P 2 o 7 preparation of
[0108] mn 2 P 2 o 7 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.
[0109] MnO 2 and NH 4 h 2 PO 4 After quantifying at an equivalent of 2:1, 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.
[0110] The above precursor was heat-treated in air at 700°C for 12 hours to obtain Mn 2 P 2 o 7 .
Embodiment 2
[0111] Embodiment 2: Preparation is coated with the Mn of carbon layer 2 P 2 o 7
[0112] The Mn prepared in the above example 1 2 P 2 o 7 After being dispersed in sucrose solution and heated by microwave, the Mn 2 P 2 o 7 A carbon coating is formed on it.
[0113] 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 was obtained by drying 2 P 2 o 7 .
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