Preparation method and application of aluminum phosphate-coated cerium-fluorine-doped lithium iron phosphate
A lithium iron phosphate and fluorine doping technology, applied in the field of nanomaterials, can solve problems such as unreported preparation methods, and achieve the effects of good industrial application prospects, good product uniformity, and low equipment requirements.
Active Publication Date: 2016-08-31
西安中科新能源科技有限公司
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Problems solved by technology
[0006] At present, the preparation method and application of cerium-fluorine-doped lithium iron phosphate coated with aluminum phosphate have not been reported yet.
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[0032] A method for preparing aluminum phosphate-coated cerium-fluorine-doped lithium iron phosphate, comprising the following steps:
[0033] step 1)
[0034] By molecular formula LiCe 0.1 FePO 4 f 0.1 Weigh 10g of lithium ferrous phosphate, 0.235g of ammonium fluoride, and 2.75g of cerium nitrate hexahydrate, add 20mL of ethanol, mix the mixture, put it into an agate ball mill jar, and then place it in a QM-2SP12 ball mill of Nanjing University Instrument Factory Ball milling in an argon atmosphere for 2 days, with a rotation speed of 300rpm, to evenly ball-mill the material;
[0035] Step 2)
[0036] After ball milling, take it out under the protection of argon atmosphere, and dry it in a vacuum oven at 50°C for 10 hours;
[0037] step 3)
[0038] Put the dried sample in JQF1400-30 high-temperature atmosphere electric furnace of Shanghai Jiugong Electric Co., Ltd., vacuumize, pass 99.9% nitrogen protection gas, and then raise the temperature to 500°C at a speed of 5°C...
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Abstract
The invention discloses a preparation method and application for aluminium-phosphate-cladded cerium-fluorine-doped lithium iron phosphate. The preparation method for the aluminium-phosphate-cladded cerium-fluorine-doped lithium iron phosphate comprises the following steps: firstly, preparing the cerium-fluorine-doped lithium iron phosphate, then adding aluminium salt and phosphate into the suspending liquid of the cerium-fluorine-doped lithium iron phosphate, uniformly cladding the particle surface of the cerium-fluorine-doped lithium iron phosphate with the prepared aluminium phosphate, and calcining the particles of the aluminium-phosphate-cladded cerium-fluorine-doped lithium iron phosphate in vacuum or protective gas atmosphere to obtain the aluminium-phosphate-cladded cerium-fluorine-doped lithium iron phosphate. The preparation process of the preparation method disclosed by the invention is simple, no pollution in reaction is achieved, the product homogeneity is good, and the prepared aluminium-phosphate-cladded cerium-fluorine-doped lithium iron phosphate is high in gram volume, and has a good industrial application prospect.
Description
technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a preparation method and application of a positive electrode material of a lithium ion secondary battery. Background technique [0002] Lithium iron phosphate cathode material has been widely used in new energy vehicles and energy storage due to its safety and high cycle life, but the low conductivity of lithium iron phosphate itself limits its application in high current discharge. Carbon coating and ion doping to improve its crystal structure are common methods to improve the conductivity of LiFePO4. [0003] Although lithium iron phosphate is considered to be a safe cathode material for lithium batteries, in actual use, lithium iron phosphate also has potential safety hazards. [0004] Using phosphate to coat the positive and negative electrode materials of lithium-ion batteries is a method to improve the safety of lithium-ion batteries. [0005] Coat...
Claims
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IPC IPC(8): H01M4/136H01M4/1397
CPCH01M4/136H01M4/1397H01M2220/20Y02E60/10
Inventor 徐士民李宏斌马毅徐一丹都云刘志坚陈俊桦
Owner 西安中科新能源科技有限公司