Solid-phase sintering synthetic method of nano lithium iron phosphate (LiFePO4)

A technology of solid phase sintering and synthesis method, which is applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of high price, affecting the speed and cost of mass production, and the precursor is easy to be oxidized, so as to shorten the diffusion path, The effect of accelerating the solid phase reaction

Inactive Publication Date: 2013-09-04
NANJING UNIV
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Problems solved by technology

[0003] The solid phase sintering method commonly used at present prepares LiFePO 4 , mainly using divalent iron source, which is expensive, and the precursor is easily oxidized, and sintering requires a long time of heat preservation, which affects the rate and cost of mass production

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  • Solid-phase sintering synthetic method of nano lithium iron phosphate (LiFePO4)
  • Solid-phase sintering synthetic method of nano lithium iron phosphate (LiFePO4)
  • Solid-phase sintering synthetic method of nano lithium iron phosphate (LiFePO4)

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Embodiment Construction

[0020] 1. Raw material weighing

[0021] Weigh 0.2626g of lithium salt, 3.0328g of ferric oxide, 3.6695g of phosphorus salt, 1.0749g of carbon source, 150g of grinding medium, and measure 50ml of acetone.

[0022] Wherein, the lithium salt is at least any one of lithium hydroxide, lithium acetate, lithium carbonate, lithium fluoride, lithium nitrate or lithium dihydrogen phosphate. Iron salt is Fe 3 o 4 , α-Fe 2 o 3 , γ-Fe 2 o 3 , Nano α-Fe 2 o 3 , Nano γ-Fe 2 o 3 At least any one of the . Phosphate salt is at least any one of phosphoric acid, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, phosphorus pentoxide, ammonium phosphate or lithium dihydrogen phosphate. The carbon source is at least any one of sucrose, glucose, organic pyrolytic carbon, conductive carbon black, carbon nanotubes, and graphene; the material of the grinding medium can be alumina, agate, zirconia, or stainless steel, and the shape can be spherical , columnar or rod-shaped.

[0...

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Abstract

The invention discloses a solid-phase sintering synthetic method of nano lithium iron phosphate (LiFePO4). The method comprises the following steps of: stirring and mixing lithium salt, ferric oxide, phosphor salt and a carbon source; then adding a grinding medium for high-speed mechanical ball-milling to acquire solid-phase reaction hybrid precursor powder; and then directly sintering the hybrid precursor powder in the presence of a non-oxidizing protective gas to prepare the lithium iron phosphate without pre-sintering. Experimental results show that the lithium iron phosphate can be synthesized without a pre-sintering process of a traditional solid-phase sintering technology, and meanwhile, the sintering time can be shortened, the grain size is decreased, and the charge and discharge capacity of a battery is obviously improved under high magnification, so that the rapid charge and discharge performance of a LiFePO4 cathode material is improved. The solid-phase synthetic method provided by the invention is convenient and energy-saving.

Description

technical field [0001] The present invention relates to LiFePO 4 The technical field of manufacturing lithium-ion secondary batteries as cathode materials, in particular to a nanoscale LiFePO 4 Solid phase sintering synthesis method of materials. Background technique [0002] As anode materials for lithium-ion secondary batteries, lithium cobalt oxide, lithium nickel oxide, lithium manganate, lithium iron phosphate, etc. are mainly studied at present. Olivine-like LiFePO 4 Compared with it, it mainly has the following advantages: (1) high energy density, its theoretical specific capacity is 169.8890mAh / g, which can be charged and discharged at a large rate; (2) high safety, no pollution; (3) long cycle life , up to more than 2000 times, no memory effect, etc. [0003] The solid phase sintering method commonly used at present prepares LiFePO 4 , which mainly uses divalent iron source, which is expensive, and the precursor is easily oxidized, and sintering requires a long...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 唐月锋戎葆华陆彦文刘学文沈飞陈庆霖唐琨杨华珍吴星云刘盼星谢双飞彭慕洋倪亮陈延峰
Owner NANJING UNIV
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