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Modified ultralow-temperature lithium iron phosphate composite material, positive electrode material and preparation method thereof

A lithium iron phosphate and composite material technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as low low-temperature discharge efficiency, improve median voltage, reduce side reactions of dissolution and corrosion, and improve low-temperature discharge. The effect of efficiency

Pending Publication Date: 2021-07-09
安徽洁途新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a modified ultra-low temperature lithium iron phosphate composite material, positive electrode material and preparation method thereof, so as to solve the technical problem of low-temperature discharge efficiency of lithium iron phosphate material in the prior art

Method used

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  • Modified ultralow-temperature lithium iron phosphate composite material, positive electrode material and preparation method thereof
  • Modified ultralow-temperature lithium iron phosphate composite material, positive electrode material and preparation method thereof
  • Modified ultralow-temperature lithium iron phosphate composite material, positive electrode material and preparation method thereof

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preparation example Construction

[0050] An embodiment of the present invention provides a method for preparing a modified ultra-low temperature lithium iron phosphate composite material, including:

[0051] S101, adding a lithium source, an iron source, a phosphorus source, and a first carbon source into the first solvent for mixing to obtain a first mixture;

[0052] Wherein, the lithium source is selected from one or more of lithium carbonate, lithium hydroxide, lithium acetate, lithium citrate, lithium dihydrogen phosphate; the iron source is selected from iron oxide, ferric oxide, citric acid One or more of iron, ferric phosphate, and ferrous oxalate; the phosphorus source is selected from one or more of ammonium dihydrogen phosphate, diammonium hydrogen phosphate, phosphoric acid, and lithium dihydrogen phosphate.

[0053] Wherein, the first carbon source is selected from one or more of glucose, sucrose, citric acid, polyethylene glycol, polyvinyl butyral, polyvinyl alcohol, polyacrylonitrile, starch, an...

Embodiment 1

[0091] This embodiment provides a modified ultra-low temperature lithium iron phosphate composite material. The composite material includes a nanoscale undoped lithium iron phosphate core and a mixed cladding layer of lanthanum phosphate and carbon. The composition and weight percentage of the core core and cladding layer are as follows: Core undoped lithium iron phosphate: 95.55%, core carbon content: 1.95%; LaPO4 content in cladding layer: 2%, carbon content in cladding layer 0.5%.

[0092] The production process is as follows: ① Stir and disperse anhydrous iron phosphate, lithium carbonate and glucose with an appropriate proportion of water according to the mass ratio of 1:0.25:0.14; ② Grind with a grinder to control the grinding particle size of the slurry to D50 3. Spray drying; 4. The dried powder was roasted at 700 degrees under a nitrogen atmosphere for 8 hours to obtain control sample 1; 5. Control sample 1, lanthanum phosphate and glucose according to the mass ratio: ...

Embodiment 2

[0094] This embodiment provides a modified ultra-low temperature lithium iron phosphate composite material. The composite material includes a nanoscale doped lithium iron phosphate core and a mixed cladding layer of lanthanum phosphate and carbon. The composition and weight percentage of the core core and cladding layer are as follows: Core doped lithium iron phosphate: 95.55%, carbon content in the core: 1.95%; LaPO4 content in the cladding layer: 2%, carbon content in the cladding layer: 0.5%.

[0095] The production process is as follows: ① Stir and disperse anhydrous iron phosphate, lithium carbonate, ammonium metavanadate, and glucose with an appropriate proportion of water in a mass ratio of 1:0.25:0.01:0.14; ②Use a grinder to grind, Control the abrasive particle size D50 of the slurry to 0.45um; ③ spray drying; ④ roast the dried powder at 700°C for 8 hours under a nitrogen protective atmosphere to obtain comparative sample 2; The ratio of 1:0.02:0.025 is mixed with an a...

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Abstract

The invention relates to the technical field of lithium ion battery positive electrode materials, in particular to a modified ultralow-temperature lithium iron phosphate composite material, a positive electrode material and a preparation method thereof. The modified ultralow-temperature lithium iron phosphate composite material comprises an inner core and a coating layer coating the outer surface of the inner core, the inner core comprises carbon and lithium iron phosphate, the coating layer comprises carbon and lanthanide-series metal phosphate, through the mode, the lithium iron phosphate and the lanthanide-series metal phosphate form a nano core-shell structure, the lanthanide metal phosphate is coated outside the lithium iron phosphate, so that the lattice matching degree of the modified ultralow-temperature lithium iron phosphate composite material at the two-phase interface of the iron phosphate and the lithium iron phosphate in the lithium intercalation and deintercalation process is improved, the median voltage of discharge is improved, the modified ultralow-temperature lithium iron phosphate composite material is suitable for an ultralow-temperature environment, and the low-temperature discharge efficiency is improved; in addition, the coating layer reduces the contact area between the lithium iron phosphate and the electrolyte, reduces the dissolution corrosion side reaction on the positive electrode material, and improves the processing and high-temperature performance of the positive electrode material.

Description

【Technical field】 [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a modified ultra-low temperature lithium iron phosphate composite material, a positive electrode material and a preparation method thereof. 【Background technique】 [0002] Lithium iron phosphate (LiFePO 4 , referred to as LFP) has been widely used in the field of power and energy storage batteries. It has the advantages of high safety, high cycle life, high quality and low price, and has broad application prospects. However, lithium iron phosphate also has obvious shortcomings, such as Poor electrical conductivity and slow diffusion of lithium ions. The current modification schemes for lithium iron phosphate include surface coating, nanonization and bulk phase doping. Among them, the surface-coated coatings include coated carbon, conductive metals, metal oxides, lithium metal oxides, lithium phosphate, and the like. [0003] In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525H01M10/42
CPCH01M4/366H01M4/5825H01M4/583H01M4/625H01M10/0525H01M10/4235Y02E60/10
Inventor 王瑛
Owner 安徽洁途新能源科技有限公司
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