Polynary manganese phosphate lithium cathode material for lithium ion battery and preparation method thereof
A lithium ion battery, lithium manganese phosphate technology, applied in the field of electrochemical power supply, can solve the problems that have not yet been seen, and achieve the effects of low cost, short process flow, and rapid charge and discharge
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Embodiment 1
[0023] Example 1Li 0.98 mn 0.96 Mg 0.01 Zn 0.01 Al 0.02 PO 4 Preparation of / C
[0024] Weigh Li according to the stoichiometric ratio 2 CO 3 36.206g, MnCO 3 110.34g, Mg(OH) 2 0.583g, Zn(OH) 2 0.994g, Al(OH) 3 1.560g, NH 4 h 2 PO 4 115.025g was poured into an agate ball mill jar, and 15.872g of glucose and 200ml of alcohol were added, ground and mixed on a planetary ball mill at a speed of 400rpm for 8h, then vacuum-dried at 70°C and put into a porcelain boat. Heat up to 700°C at a rate of 5°C / min in a tubular resistance furnace with high-purity nitrogen gas, and keep it warm for 10 hours. After cooling with the furnace, grind it with a mortar and pass through a 200-mesh sieve, which is the carbon-containing polyphosphate positive electrode material.
[0025] figure 1 The A pattern in the sample is the X-ray diffraction pattern of this sample, indicating that it has olivine-type LiMnPO 4 crystal structure, and no diffraction peaks of impurity phases were seen....
Embodiment 2
[0028] Example 2Li 0.99 mn 0.97 Ni 0.01 Cu 0.01 Cr 0.01 PO 4 Preparation of / C
[0029] Weigh LiOH·H according to the stoichiometric ratio 2 O41.543g, MnC 2 o 4 2H 2 O173.563g, Ni(CH 3 COO) 2 4H 2 O2.488g, Cu(CH 3 COO) 2 ·H 2 O1.996g, Cr(CH 3 COO) 3 2.291g, NH 4 h 2 PO 4 115.025g and pour it into an agate ball mill jar, add 300ml of alcohol, ball mill for 3 hours and then dry, pre-burn in a tube furnace with nitrogen at 400°C for 5 hours, add 21.372g of sucrose, 50ml of deionized water, and 150ml of alcohol after cooling , ball milled again for 3h and dried, then fired in a tube furnace with nitrogen at 650°C for 12h. After cooling with the furnace, grind it with a mortar and pass through a 200-mesh sieve, which is the carbon-containing polyphosphate positive electrode material.
[0030] figure 1 The spectrum B in the figure is the X-ray diffraction spectrum of this sample, which also has an olivine crystal structure, and no diffraction peak of the impurity...
Embodiment 3
[0031] Example 3Li 0.99 mn 0.97 Mg 0.01 Ni 0.01 In 0.01 PO 4 Preparation of / C
[0032] Weigh LiOH·H according to the stoichiometric ratio 2 O4 1.543g, MnCO 3 111.49g, Mg(CH 3 COO) 2 4H 2 O2.451g, Ni(CH 3 COO) 2 4H 2 O2.488g, In(OH) 3 1.658g, (NH 4 ) 2 HPO 4 132.056g was poured into an agate ball mill jar, and 17.883g of sucrose and 250ml of alcohol were added, ground and mixed on a planetary ball mill at a speed of 400rpm for 5h, dried and roasted at 720°C for 15h in a tube furnace with nitrogen. After cooling with the furnace, grind it with a mortar and pass through a 200-mesh sieve, which is the carbon-containing polyphosphate positive electrode material.
[0033] figure 1 The C pattern in the sample is the X-ray diffraction pattern of this sample, indicating that it has olivine-type LiMnPO 4 crystal structure, and no diffraction peaks of impurity phases were seen. Its carbon content was measured by a carbon-sulfur analyzer to be 2.2%. The testing proce...
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