A lithium iron manganese phosphate-tungsten disulfide nanosheet lithium battery positive electrode material and preparation method thereof

A technology of lithium iron manganese phosphate and tungsten disulfide, applied in battery electrodes, batteries, nanotechnology, etc., can solve the problems of poor cycle stability, poor high temperature stability and low temperature stability of layered manganese oxide lithium structure, and achieve charging and discharging Stable cycle structure, excellent high and low temperature resistance, and increased lithium storage performance

Active Publication Date: 2019-11-08
HENAN LI POWER SUPPLY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the defects of low electrical conductivity, poor low-temperature stability, and low capacitance in the existing olivine-type lithium iron phosphate as the positive electrode material of lithium-ion batteries, and the defects of poor cycle stability and high-temperature stability of the layered manganese oxide lithium structure, the present invention provides A lithium iron manganese phosphate-tungsten disulfide nanosheet lithium battery cathode material. The two-dimensional structure of the tungsten disulfide nanosheet layer structure provides a short-distance open channel for lithium ion intercalation and deintercalation. It has high electrical conductivity and high and low temperature resistance. Excellent performance, high capacitance density, effective buffer volume expansion of the battery structure, improved cycle stability and high rate performance

Method used

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  • A lithium iron manganese phosphate-tungsten disulfide nanosheet lithium battery positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] (1) Lithium hydroxide, ferric chloride, and phosphoric acid molar ratio Li:Fe:P=1:0.99:1.08 are mixed and dissolved in water, and the molar ratio of the amount of water to the lithium atom in the lithium compound used is 30:1. Stir and disperse at a high speed of 1400rpm in a high-speed mixer for 5 minutes to form a lithium iron phosphate precursor;

[0035] (2) Mix manganese dioxide, trimanganese tetraoxide, and lithium carbonate in molar ratios of manganese dioxide: trimanganese tetraoxide: lithium carbonate = 1:0.4:0.92, and stir at a high speed of 1400rpm in a high-speed mixer Disperse for 3 minutes to obtain a lithium manganese oxide precursor;

[0036] (3) At room temperature, first mix sodium tungstate, hydroxylamine hydrochloride and thiourea in a molar ratio of sodium tungstate: hydroxylamine hydrochloride: thiourea = 1:1.5:3, and add a certain amount of surfactant trimethyldecamyl Hexaalkylammonium bromide, reacted at a constant temperature of 100°C for 10 hour...

Embodiment 2

[0042] (1) Lithium acetate, ferric chloride, and ammonium phosphate are mixed and dissolved in water at a molar ratio of Li:Fe:P=1:1:1, and the molar ratio of the amount of water to the lithium atom in the lithium compound used is 100:1 , stirring and dispersing at a high speed of 2000rpm in a high-speed mixer for 5 minutes to form a lithium iron phosphate precursor;

[0043] (2) Mix manganese dioxide, trimanganese tetraoxide, and lithium carbonate in molar ratios of manganese dioxide: trimanganese tetraoxide: lithium carbonate = 1:0.5:1, and stir in a high-speed mixer at a speed of 5000rpm Disperse for 5 minutes to obtain a lithium manganese oxide precursor;

[0044] (3) At room temperature, first mix sodium tungstate, hydroxylamine hydrochloride and thiourea in a molar ratio of sodium tungstate: hydroxylamine hydrochloride: thiourea = 1:2:3, and add a certain amount of surfactant dodecyl Sodium sulfonate was reacted at a constant temperature of 150°C for 8 hours to obtain t...

Embodiment 3

[0050] (1) Lithium nitrate, iron sulfate, and ammonium dihydrogen phosphate are mixed and dissolved in water at a molar ratio of Li:Fe:P=1:1.03:1.08. The molar ratio of the amount of water to the lithium atom in the lithium compound used is 300: 1. Stir and disperse at a high speed of 1400rpm in a high-speed mixer for 3 minutes to form a lithium iron phosphate precursor;

[0051] (2) Mix manganese dioxide, trimanganese tetraoxide, and lithium carbonate in molar ratios of manganese dioxide: trimanganese tetraoxide: lithium carbonate = 1:0.8:0.92, and stir in a high-speed mixer at a speed of 5000rpm Disperse for 4 minutes to obtain a lithium manganese oxide precursor;

[0052] (3) At room temperature, first mix sodium tungstate, hydroxylamine hydrochloride and thiourea in a molar ratio of sodium tungstate: hydroxylamine hydrochloride: thiourea=1:1.5:3.5), and add a certain amount of surfactant polyethylene glycol Alcohol 400, reacted at a constant temperature of 200°C for 8 hou...

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Abstract

The application provides lithium ferric manganese phosphate-tungsten disulfide nanometer lithium cell positive material and preparation method thereof, the method, in the process of lithium ferric manganese phosphate formation by lithium iron phosphate and lithium manganese oxide, creatively draws support from the induction of layer construction of lithium manganese oxide and two dimension construction tungsten disulfide nanometer, and forms stratiform lithium ferric manganese phosphate-tungsten disulfide nanometer lithium cell positive material. Two dimension construction tungsten disulfide nanometer stratiform construction supplies short distance open tunnel for lithium ion intercalation and deintercalation, possesses high electric conductivity rate, good high-low temperature resistance, and large electric capacity intensity, buffers effectively the volume expansion of cell construction, enhances cycling stability and rate discharge capability.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a lithium iron manganese phosphate-tungsten disulfide nanosheet electrode material and a preparation method. Background technique [0002] The development and application of electric vehicles can effectively alleviate the energy crisis and environmental pollution. Lithium-ion batteries are considered to be the high-performance batteries that are most likely to meet the needs of electric vehicles and hybrid electric vehicles in today's society because of their high energy density, long service life, and many advantages such as no pollution to the environment. Lithium-ion battery is a new type of secondary energy storage battery developed in the 1990s. Due to the advantages of high energy, long life, low consumption, no pollution, no memory effect, small self-discharge, low internal resistance, high cost performance, and less pollution, it is widely used in mobile phones, notebook...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/5815H01M4/5825H01M2220/20Y02E60/10
Inventor 陈庆曾军堂王镭迪
Owner HENAN LI POWER SUPPLY
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