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Method for synthesizing lithium ion battery high-potential positive electrode material

A technology for lithium ion batteries and cathode materials, applied in the field of materials, can solve problems such as poor rate performance, many oxygen vacancies, and many impurities, and achieve the effects of good reproducibility and convenient operation

Inactive Publication Date: 2015-12-30
SHANGHAI ELECTRICGROUP CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides a method for synthesizing high-potential positive electrode materials for lithium-ion batteries to solve many problems such as more oxygen vacancies, poor rate performance, more impurities, and unsatisfactory cycle life of lithium nickel manganese oxide positive electrode materials.

Method used

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  • Method for synthesizing lithium ion battery high-potential positive electrode material
  • Method for synthesizing lithium ion battery high-potential positive electrode material
  • Method for synthesizing lithium ion battery high-potential positive electrode material

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preparation example Construction

[0026] A method for synthesizing a high-potential cathode material for a lithium-ion battery according to an embodiment of the present invention, the specific steps are:

[0027] Step 1, prepare nickel manganese oxide Ni 0.5 mn 1.5 o x ,include:

[0028] Step 1.1, nickel acetate, manganese acetate and citric acid are fully dissolved in water, the total amount of nickel acetate and manganese acetate is the same as that of citric acid, stir, adjust the pH to 7-8 with ammonia water, evaporate to dryness, and obtain xerogel, in vacuum Bake in an oven at 100-120°C for 10-12 hours;

[0029] Step 1.2, calcining the xerogel in the air at 450-500°C to obtain nickel manganese oxide Ni 0.5 mn 1.5 o x .

[0030] Step 2, nickel manganese oxide Ni 0.5 mn 1.5 o x , potassium chloride molten salt and lithium hydroxide mixed, nickel manganese oxide Ni 0.5 mn 1.5 o x The molar ratio with potassium chloride is 1:0.5~4, nickel manganese oxide Ni 0.5 mn 1.5 o x The molar ratio to l...

Embodiment 1

[0037]Weigh 0.05 mol of nickel acetate and 0.15 mol of manganese acetate, ultrasonically disperse them in water for 10 minutes, then add an aqueous solution containing 0.2 mol of citric acid, and adjust the pH to 7-8 with ammonia water. Under constant stirring at 80°C, the solution gradually turned into a green gel. The obtained gel was dried in a vacuum oven at 120° C. for 12 hours.

[0038] The above dry gel was calcined at 500° C. for 4 hours to obtain a nickel manganese oxide precursor. The precursor was mixed with 0.4mol potassium chloride and 0.1mol lithium hydroxide, ground evenly, and pre-calcined at 800°C for 30 minutes in oxygen. Keeping the oxygen flow rate, the temperature was raised to 900°C for 12 hours of calcination.

[0039] After natural cooling, take out the sample, filter the sample under distilled water cleaning, until the filtrate is tested by 0.1mol / L silver nitrate solution and no white precipitate appears, and then do ICP test on the sample to detect...

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Abstract

The invention discloses a method for synthesizing a lithium ion battery high-potential positive electrode material. The method comprises the following steps: uniformly mixing a nickel-manganese oxide Ni0.5Mn1.5IOx, a potassium chloride molten salt and lithium hydroxide, wherein the molar ratio of the nickel-manganese oxide Ni0.5Mn1.5IOx to potassium chloride is 1:(0.5-4), and the molar ratio of the nickel-manganese oxide Ni0.5Mn1.5IOx to lithium hydroxide is 1:1; carrying out 30-120 minutes' pre-calcination at 650-800 DEG C, and then carrying out 10-12 hours' calcination at 850-950 DEG C, wherein the calcination atmosphere is pure oxygen or an oxygen-nitrogen mixture. According to the technical scheme, the method is convenient to operate and high in reproducibility; the lithium ion battery high-potential positive electrode material synthesized according to the method has an obviously loose structure and a good crystal form.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a method for manufacturing an electrode material, in particular to a high-potential positive electrode material LiNi for a lithium-ion battery 0.5 mn 1.5 o 4 synthetic method. Background technique [0002] At present, lithium-ion batteries have been widely used, and related technologies are developing rapidly. Industrial lithium-ion batteries generally use layered LiMO 2 and spinel LiMn 2 o 4 Positive electrode materials, but the above-mentioned materials have poor cycle performance, low capacity, and low voltage platform due to their essential reasons, which seriously affect the energy density and power density of lithium-ion batteries. [0003] In recent years, lithium nickel manganese oxide cathode material has attracted extensive attention from academia and industry because of its high working voltage (4.7V). Lithium nickel manganese oxide cathode material is essentially the tra...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/04H01M10/0525
CPCH01M4/0471H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 廖文俊刘佳丽万玲玉丁柳柳潘光杰余爱水路旭
Owner SHANGHAI ELECTRICGROUP CORP