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Lithium iron phosphate preparation capable of improving material specific capacity
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A lithium iron phosphate, specific capacity technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high toxicity, poor cycle stability, and high cost of lithium cobaltate
Inactive Publication Date: 2009-05-20
CAIHONG GRP ELECTRONICS CO LTD
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Problems solved by technology
Metal oxides such as layered LiMO 2 (M=Co, Ni, Mn) and lithium manganese oxide with spinel structure (LiMn 2 o 4 ) is currently widely researched lithium-ion battery cathode material, in which lithium cobalt oxide (LiCoO 2 ) has high cost, poor resources and high toxicity, lithium nickelate (LiNiO 2 ) is difficult to prepare and has poor thermal stability, LiMn 2 o 4 low capacity and poor cycle stability
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Embodiment 1
[0017] (1) Weigh lithium acetate (C 2 h 3 LiO 2 2H 2 O) 102.02g, ferrous acetate (FeC 4 h 6 O4) 173.93g, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 115.02g, sucrose 23.4g, packed into planetary ball mill, ball milled for 4 hours;
[0018] (2) Put the ball-milled material into a box furnace, protect it with nitrogen, keep it warm at 400°C for 5 hours, keep it at 800°C for 10 hours, and heat up at a rate of 30°C / hour;
[0019] (3) After cooling, pass through a 300-mesh sieve, weigh, take 100g and mark it as A-2, and the rest as A-1; wash the powder marked A-2 with 200g of deionized water, and stir at 100 rpm / min, the time is 10 minutes, standing, sedimentation, draining, washing four times altogether.
[0020] (4) Put the material into an airtight container with a hole in the upper cover, pour 100mL of alcohol, and stir for 10 minutes at a speed of 50 rpm with a mixer; pour the material into a plate, place it in a fume hood, and Dry, pass through a 300-mesh sieve ...
Embodiment 2
[0022] (1) take lithium oxalate (C 2 h 2 o 4 2Li) 101.90g, ferrous oxalate (C 2 FeO 4 2H 2 O) 179.90g, diammonium hydrogen phosphate [(NH 4 ) 2 HPO 4 ] 132.06g, 8.28g of sucrose, packed into planetary ball mill, ball milled for 4 hours;
[0023] (2) Put the ball-milled material into a box furnace, protect it with nitrogen, keep it warm at 300°C for 10 hours, keep it at 700°C for 20 hours, and heat up at a rate of 30°C / hour;
[0024] (3) Pass through a 300-mesh sieve after cooling, weigh, take 100g and mark it as B-2, and mark the rest as B-1; wash the powder marked B-2 with 200g of deionized water, stirring at 80 rpm / min, the time is 30 minutes, standing, settling, draining, washing four times altogether.
[0025] (4) Put the material into a closed container with a hole in the upper cover, pour 100mL of acetone, stir with a mixer at a speed of 30 rpm for 30 minutes, pour the material into a plate, and place it in a fume hood , dried naturally, and passed through a 3...
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Abstract
The invention discloses a preparation method of ferrousphosphatelithium which can improve the specific capacity of materials, and the method has the keys of (1) mixing and ball milling phosphate, ferrous salt, lithium salt and carbon source; (2) calcining by adopting two sections of low temperature plus high temperature; (3) agitator washing the powder synthesized by calcination through using deionized water; and (4) agitator treating the powder washed by the deionized water through using alcohol or acetone; and finally pouring the material in an open vessel, natural drying and passing by a 300-mesh sieve, thus obtaining the ferrousphosphatelithium.
Description
technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a preparation method of lithium ferrous phosphate which can improve the specific capacity of the material. Background technique [0002] Cathode materials are an important part of lithium-ion batteries. Metal oxides such as layered LiMO 2 (M=Co, Ni, Mn) and lithium manganese oxide with spinel structure (LiMn 2 o 4 ) is currently widely researched lithium-ion battery cathode material, in which lithium cobalt oxide (LiCoO 2 ) has high cost, poor resources and high toxicity, lithium nickelate (LiNiO 2 ) is difficult to prepare and has poor thermal stability, LiMn 2 o 4 The capacity is low and the cycle stability is poor. The development of lithium-ion battery cathode materials with high performance and low cost is a hot topic in the research field of lithium-ion battery materials. At present, the lithium cobalt oxide material w...
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