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A kind of preparation method of high specific energy olivine manganese phosphate lithium lithium ion battery cathode material
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A lithium-ion battery, olivine-type technology, used in battery electrodes, secondary batteries, circuits, etc.
Active Publication Date: 2020-10-27
XI AN JIAOTONG UNIV
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[0006] LiMnPO in prior art 4 Electronic conductance and ion conductance still need to be improved
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[0043] Press LiMn 0.85-x Fe 0.15 Zr x (PO 4 ) 1-2x (SiO 4 ) 2x Stoichiometric ratio, where x=0.005, mix lithium source, manganese source, phosphorus source, iron source, zirconium source and silicon source evenly, heat treatment at 300°C for 10 hours, then pulverize and grind, and then sinter at 500°C for 20 hours , after sieving, high specific energy olivine manganese phosphate lithium lithium ion batterycathode materialpowder is obtained.
[0051] Press LiMn 0.85-x Fe 0.15 Zr x (PO 4 ) 1-2x (SiO 4 ) 2x Stoichiometric ratio, where x=0.02, mix lithium source, manganese source, phosphorus source, iron source, zirconium source and silicon source evenly, heat treatment at 350°C for 7 hours, then pulverize and grind, and then sinter at 550°C for 15 hours , after sieving, high specific energy olivine manganese phosphate lithium lithium ion battery cathode materialpowder is obtained.
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Abstract
A preparation method of olivine type lithiummanganesephosphatelithiumion battery anode material with high specific energy is disclosed.according to LiMn0. 85-XFe0.15Zrx(PO4)1-2x (SiO4) 2x stoichiometric ratio, wherein, x=0. 005-0.05, that lithium source, the manganese source, the phosphorus source, the iron source, the zirconium source and the silicon source are uniformly mixed, heat treated at 300-450 DEG C for 2-10 hour, then pulverized and ground, and sintered at 500-800 DEG C for 3-20 hours. The invention has the advantages of simple process route, easy operation, short production period, low production cost, and the like, and greatly improves the circulation performance and the rate performance, and is suitable for practical application and large-scale production. The material prepared by the invention is assembled into an experimental battery, and the performance of the battery is tested on a charging and discharging test platform, and the result shows that the cycling performance and the rate performance of the material are improved through a multi-doping modification method.
Description
technical field [0001] The invention relates to a novel modification method for anode materials of lithium ion batteries, in particular to a method for preparing high specific energyolivinemanganesephosphate lithium lithium ion batterycathode materials. Background technique [0002] with LiFePO 4 Similar to LiMnPO 4 It has the following advantages: environmental friendliness, low cost and good safety performance. In addition, due to its high operating voltage (4.1V), LiMnPO 4 energy density (about 700Wh·kg -1 ) than LiFePO 4 20% higher. Therefore, LiMnPO 4 It is regarded as the next-generation cathode material for lithium-ion batteries. However, LiMnPO 4 Lithium-ion conductivity is better than that of LiFePO 4 Low. During the charging and discharging process, MnO 6 The octahedral lattice distortion hinders the deintercalation of lithium ions and produces a large volume change. These intrinsic defects lead to LiMnPO 4 Fast capacity fading and poor rate perfor...
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