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A kind of positive electrode composite material of lithium ion battery and preparation method thereof

A lithium-ion battery and composite material technology, applied in the field of lithium-ion batteries, can solve the problems of large product particle size, poor electrochemical performance, and high production cost, and achieve the effects of uniform particle distribution, low formation temperature, and increased transmission speed

Active Publication Date: 2015-11-18
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the current synthesis methods are high-temperature solid-phase methods, which use lithium salts, manganese salts, phosphates, and carbon materials as raw materials. After calcination in a reducing atmosphere, the product particle size is large, resulting in poor electrochemical performance; cumbersome, low product purity, and high production costs

Method used

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  • A kind of positive electrode composite material of lithium ion battery and preparation method thereof
  • A kind of positive electrode composite material of lithium ion battery and preparation method thereof
  • A kind of positive electrode composite material of lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1: LiMnPO 4 Preparation of carbon composite cathode materials

[0025] Dissolve manganese acetate in 30ml of diethylene glycol to prepare a solution with a manganese ion concentration of 0.02M, then dissolve lithium dihydrogen phosphate in 30ml of diethylene glycol to prepare a solution with a phosphate concentration of 0.02M, and then Slowly added dropwise to the diethylene glycol solution of manganese acetate prepared, stirred for 3 hours to obtain a pink suspension; the obtained suspension was put into a 100ml hydrothermal kettle, and heat-treated at a temperature of 180°C for 10 hours to obtain Pink precipitate; the precipitate was washed with deionized water and absolute ethanol respectively, and then dried at 60°C for 24 hours to obtain a final tap density of 1.2g / cm 3 LiMnPO 4 Nano powder. Its X-ray diffraction analysis (XRD) results show that its crystal phase is an olivine structure, such as figure 1 shown. Scanning electron microscope (SEM) photos...

Embodiment 2

[0028] Example 2: LiMn 0.98 Mg 0.02 PO 4 Preparation of carbon composite cathode materials

[0029]According to the stoichiometric ratio that the molar ratio of manganese ion and magnesium ion is 98:2, weigh and dissolve manganese sulfate and magnesium sulfate in 30ml polyethylene glycol 300 to prepare a solution with a metal ion concentration of 0.01M, and then add phosphoric acid Lithium dihydrogen was dissolved in 30ml of polyethylene glycol 300 to prepare a solution with a phosphate concentration of 0.01M, and then slowly added dropwise to the prepared polyethylene glycol 300 solution of manganese sulfate and magnesium sulfate, and stirred for 6 hours , to obtain a pink suspension; the obtained suspension was packed into a 100ml hydrothermal kettle, and heat-treated at a temperature of 120°C for 24 hours to obtain a pink precipitate; the precipitate was washed with deionized water and absolute ethanol respectively, Then dry at 80°C for 24 hours, and finally obtain a tap...

Embodiment 3

[0032] Example 3: LiMn 0.96 Mg 0.04 PO 4 Preparation of carbon composite cathode materials

[0033] According to the stoichiometric ratio of the molar ratio of manganese ions and magnesium ions being 96:4, dissolve manganese chloride and magnesium chloride in 30ml polyethylene glycol 400 to prepare a solution with a metal ion concentration of 0.05M, and then add phosphoric acid Lithium dihydrogen was dissolved in 30ml of polyethylene glycol 400 to prepare a solution with a phosphate concentration of 0.05M, and then slowly added dropwise to the prepared polyethylene glycol 400 solution of manganese chloride and magnesium chloride, and stirred for 12 hours , to obtain a pink suspension; put the obtained suspension into a 100ml hydrothermal kettle, and heat-treat it at 140°C for 18 hours to obtain a pink precipitate; wash the precipitate with deionized water and absolute ethanol respectively, Then dry at 100°C for 10 hours, and finally obtain a tap density of 1.3g / cm 3 LiMn ...

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Abstract

The invention discloses a lithium-ion battery composite cathode material and a preparation method thereof. The lithium-ion battery composite cathode material is composed of LMMP and a carbon material; the LMMP is phosphate in an olivine structure, and the phosphate is in stoichiometric proportion as shown in LiMn1-xMgxPO4, wherein x is not less than 0 and not more than 0.1; the LMMP is in a laminated structure, the sheet thickness is 10-30 nm, the size is 200-300 nm, and the powder tap density is 1.2-1.6g / cm<3>; and the carbon material is one or any combination of conductive carbon black and a carbon nano-tube. The preparation method comprises the following steps: solvothermal preparation of nano LMMP particles; ball-milling and mixed cladding of carbon; and annealing. Compared with the prior art, the adopted solvothermal method has the advantages of rapid reaction, low synthesis temperature and effectively controllable product appearance; and the product has uniform chemical components and uniformly distributed particles. By the subsequent ball-milling-annealing method, the nano LMMP / carbon composite material with high uniform dispersion can be obtained. The preparation method disclosed by the invention has the advantages that the technical process is simple, preparation parameters are easy to control, the repeatability is good, and the large-scale synthesis can be realized.

Description

technical field [0001] The invention relates to a lithium-ion battery cathode composite material in the field of lithium-ion batteries and a preparation method thereof. Background technique [0002] The increasingly serious energy crisis and global environmental problems have accelerated the pace of human society to develop new clean energy storage devices. Among them, lithium-ion batteries have the advantages of high voltage, high capacity, long cycle life, and good safety performance. They have broad application prospects in portable electronic equipment, electric vehicles, space technology and other fields. They are currently energy storage devices that various countries are committed to developing. Olivine-type lithium-containing transition metal phosphate LiMPO 4 (M=Mn, Fe, Co, Ni) has the advantages of stable structure, good thermal stability, high safety, etc., and the theoretical capacity is as high as 170mAhg -1 , is currently the most ideal cathode material for l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 关翔锋李广社李莉萍
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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