Preparation method of lithium manganous silicate cathode material with mesoporous structure
A technology of lithium manganese silicate and cathode material, applied in structural parts, battery electrodes, electrical components, etc., can solve the problems of low electronic conductivity, no obvious improvement in electrochemical performance, and small specific surface area of lithium manganese silicate cathode material. , to achieve the effect of large specific surface area, enhanced electronic conductivity, improved electrical conductivity and high current discharge performance
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Embodiment 1
[0031] Step 1, liquid phase reaction
[0032] (1) Weigh 0.1mol LiOH·H 2 O was added to 40ml of deionized water, stirred for 1 hour to dissolve, and 0.025mol silicon-based molecular sieve MCM-41 was added to the lithium salt solution, and ultrasonically dispersed for 1 hour to obtain a dispersion;
[0033] (2) Weigh 0.025mol MnCl 2 4H 2 O, add in 20ml ethylene glycol, stir for 1h until completely dissolved to obtain solution 1;
[0034] (3) Mix the above-mentioned dispersion liquid and solution 1, stir for 2 hours, add it into a polytetrafluoroethylene-lined hydrothermal reaction kettle with a volume of 100 ml, and conduct a hydrothermal reaction at 120° C. for 48 hours to obtain precipitate 1;
[0035] (4) The precipitate 1 was washed 5 times with water, filtered, and vacuum-dried at 60° C. for 12 hours to obtain the precipitate 2;
[0036]Step 2. High temperature solid phase sintering
[0037] The precipitate 2 was mechanically ball milled in a ball mill for 2 hours at a...
Embodiment 2
[0039] Step 1, liquid phase reaction
[0040] (1) Add 0.1mol of silica powder and 1.3g of carbon-containing templating agent hexadecyltrimethylammonium bromide to 500ml containing 0.4mol LiAc·2H 2 In the aqueous solution of O, add ammonia water to adjust the pH value to 10, and ultrasonically disperse for 2 hours to obtain a dispersion liquid; the predicted output of lithium manganese silicate is 16.1g;
[0041] (2) Add 0.1mol Mn(Ac) 2 4H 2 O was dissolved in 200ml absolute ethanol to obtain solution 1;
[0042] (3) The above-mentioned dispersion liquid and solution 1 were mixed, stirred for 1 h, added into a polytetrafluoroethylene-lined hydrothermal reaction kettle with a volume of 400 ml, and reacted hydrothermally at 150° C. for 36 h to obtain precipitate 1;
[0043] (4) The precipitate 1 was washed with water six times, filtered, and vacuum-dried at 90° C. for 36 hours to obtain the precipitate 2;
[0044] Step 2. High temperature solid phase sintering
[0045] The p...
Embodiment 3
[0047] Step 1, liquid phase reaction
[0048] (1) Weigh 0.06mol LiOH·H 2 O was added to 40ml of deionized water, stirred for 1 hour to dissolve it, and 0.015mol silicon-based molecular sieve SBA-15 was added to the lithium salt solution, and ultrasonically dispersed for 1 hour to obtain a dispersion;
[0049] (2) Weigh 0.015mol MnAc 2 4H 2 O, add in 20ml ethylene glycol, stir for 1h until completely dissolved, and obtain solution 1;
[0050] (3) Mix the above-mentioned dispersion liquid and solution 1, stir for 1 h, and react in a silicone oil bath at 150° C. for 24 h to obtain precipitate 1;
[0051] (4) The precipitate 1 was washed 7 times with water, filtered, and vacuum-dried at 70°C for 6 hours to obtain the precipitate 2;
[0052] Step 2. High temperature solid phase sintering
[0053] The precipitate 2 was mechanically ball-milled in a ball mill for 5 hours at a speed of 300 r / min in an acetone medium, and then calcined in a tube furnace for 8 hours under an argon ...
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