Method for modifying nickel lithium manganate material of lithium-ion battery

A lithium-ion battery, lithium nickel manganese oxide technology, applied in the field of battery material preparation and modification, can solve the problems of restricting battery performance, difficult to control environmental moisture, and high battery moisture content, improving cycle and rate performance, and improving the first Coulombic efficiency Effect

Inactive Publication Date: 2016-06-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the difficult control of environmental moisture in the production process of lithium nickel manganese oxide batteries, the moisture content inside the battery is too high, which in turn causes a chain electrochemical reaction, promotes the decomposition of the electrolyte, and releases a large amount of gas
Especially after the lithium nickel manganese oxide battery is stored at high temperature, a large amount of gas will accumulate inside the battery, and the expansion phenomenon of the battery is very obvious, which seriously restricts the performance of the battery

Method used

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  • Method for modifying nickel lithium manganate material of lithium-ion battery
  • Method for modifying nickel lithium manganate material of lithium-ion battery
  • Method for modifying nickel lithium manganate material of lithium-ion battery

Examples

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Effect test

Embodiment 1

[0025] (1) Preparation of pure-phase lithium nickel manganate precursor: Accurately weigh lithium acetate, nickel sulfate and manganese sulfate according to the Li:Ni:Mn element ratio of 2:1:3, fully dissolve them in deionized water, and slowly add them to the solution. In the ultrasonic citric acid aqueous solution, the amount of citric acid added is 1% of the theoretically synthesized lithium nickel manganate mass fraction. The solution was reacted under reflux at 60°C for 2h, and a sol was formed. The sol was dried at 100°C to form a green xerogel. After grinding, it was pre-fired for 3h in an air atmosphere of 400°C. After natural cooling, the pure phase nickel-manganese was obtained. Lithium oxide precursor;

[0026] (2) Accurately weigh strontium nitrate, ferric nitrate, and ammonium molybdate according to Sr:Fe:Mo=2:1:1, add them to deionized water, and then add nitric acid 1 times the amount of ammonium molybdate to make it The solution is completely dissolved; the li...

Embodiment 2

[0036](1) Preparation of pure-phase nickel manganate precursor: Accurately weigh lithium nitrate, nickel nitrate, and manganese nitrate according to the Li:Ni:Mn element ratio of 2.03:1:3, fully dissolve them in deionized water, and slowly add them to In the ultrasonic citric acid aqueous solution, the amount of citric acid added is 2% of the theoretical synthesis of lithium nickel manganate, the solution is reacted at 65 °C for 3 hours under reflux conditions, and a sol is formed. The sol is dried at 100 °C to form a green dry Gel, after grinding, pre-fired for 3.5 hours in an air atmosphere of 450 °C, naturally cooled and taken out to obtain a pure phase lithium nickel manganate precursor;

[0037] (2) Accurately weigh strontium nitrate, ferric nitrate, and ammonium molybdate according to Sr:Fe:Mo=2:1:1, add them to deionized water, and then add nitric acid 1.5 times the amount of ammonium molybdate to make it The solution is completely dissolved; the lithium nickel manganat...

Embodiment 3

[0041] (1) Preparation of pure phase nickel manganate precursor: Lithium acetate, nickel chloride and manganese chloride are accurately weighed and fully dissolved in deionized water according to the Li:Ni:Mn element stoichiometric ratio of 2.05:1:3. It was added to the ultrasonic citric acid aqueous solution, wherein the amount of citric acid added was 2% of the mass fraction of theoretically synthesized lithium nickel manganate. The solution was reacted at 70 °C for 5 hours under reflux conditions, and a sol was formed. The sol was dried at 110 °C to form Green xerogel, after grinding, pre-fired in an air atmosphere of 500 °C for 4 hours, and then naturally cooled and taken out to obtain a pure phase lithium nickel manganate precursor;

[0042] (2) Accurately weigh strontium nitrate, ferric nitrate, and ammonium molybdate according to Sr:Fe:Mo=2:1:1, add them into deionized water, and then add nitric acid twice the amount of ammonium molybdate to make them The solution is co...

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Abstract

The invention discloses a method for modifying a nickel lithium manganate material of a lithium-ion battery. The method comprises the following steps: preparing a pure-phase nickel lithium manganate precursor, preparing a strontium-ferrite-molybdenum solution, adding the pure-phase nickel lithium manganate precursor into the strontium-ferrite-molybdenum solution to react, and drying so as to obtain gel; and grinding the gel, calcining for 4-12 hours at 750-1000 DEG C in the presence of air atmosphere, cooling to 500-700 DEG C, keeping the temperature for 4-10 hours, and annealing, thereby obtaining a strontium-ferrite-molybdenum wrapped nickel lithium manganate composite material. By adopting the method, the surface of the nickel lithium manganate material is effectively wrapped by strontium-ferrite-molybdenum, the initial Coulomb efficiency of the lithium-ion battery is improved, and the circulation and rate capability of the lithium-ion battery can be improved. Meanwhile, due to the wrapped layer, dissolution of manganese can be inhibited, so that side reaction of an anode material in high voltage can be reduced, and the structural stability of an electrode material can be protected.

Description

technical field [0001] The invention belongs to the technical field of preparation and modification of battery materials, in particular to a lithium-ion battery lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ) Modification method of the material. technical background [0002] In the 21st century, the energy crisis and environmental degradation have become two major problems to be solved in the world today, and due to the rapid development of space technology, mobile communications, missiles, aerospace, electric vehicles and other fields, there is a sharp demand for high-performance non-polluting chemical power supplies increase. Lithium-ion batteries belong to the field of clean energy and have the advantages of good safety, good cycle performance, long life, non-toxic and pollution-free, making them the first choice for power batteries. Spinel lithium nickel manganese oxide, as the positive electrode material of lithium-ion batteries, has many advantages such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/525H01M4/505H01M4/1391
CPCH01M4/1391H01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘兴亮杨茂萍彭家兴汪伟伟
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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