High-voltage lithium oil battery positive electrode material with spinel structure and preparation method of high-voltage lithium oil battery positive electrode material

A lithium-ion battery, spinel structure technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of low first Coulomb efficiency, poor cycle performance and rate performance, and achieve improved cycle and rate performance, The effect of uniform particles and pollution reduction

Inactive Publication Date: 2016-05-11
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the invention is to solve the problem of existing high voltage spinel LiNi 0.5 mn 1.5 o 4 For the first time, the positive electrode material has the problems of low Coulombic efficiency, poor cycle performance and rate performance, and provides a high-voltage spinel lithium-ion battery positive electrode material with high performance and low cost and its preparation method, and uses Li doping to form lithium-rich Type LiNi 0.5 mn 1.5 o 4 Cathode material with improved chemical performance

Method used

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  • High-voltage lithium oil battery positive electrode material with spinel structure and preparation method of high-voltage lithium oil battery positive electrode material
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  • High-voltage lithium oil battery positive electrode material with spinel structure and preparation method of high-voltage lithium oil battery positive electrode material

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Embodiment 1

[0028] Embodiment one: the preparation method of the positive electrode material of high-voltage lithium-ion battery with spinel structure, comprises the steps:

[0029] (1) Lithium nitrate, nickel acetate, manganese acetate and aluminum nitrate are 1.076:0.45:1.5:0.025 in molar ratio, fully dissolved with deionized water respectively, each solution after dissolving is mixed in a clean large beaker, Among them, in order to prevent a small amount of volatilization of lithium under high temperature environment, the excess of lithium nitrate is 5%, and finally mixed with citric acid and continuously stirred and added ammonia water to adjust the pH at 7-8, the molar ratio of the total amount of nickel acetate, manganese acetate and aluminum nitrate to citric acid 1:1;

[0030] (2) Under the condition of 80° C., the mixed solution obtained in step (1) was evaporated at a constant temperature for 10 hours at a stirring speed of 200 rpm to obtain a sol;

[0031] (3) Place the sol in a...

Embodiment 2

[0038] Embodiment two: the preparation method of the positive electrode material of high-voltage lithium-ion battery with spinel structure, comprises the following steps:

[0039] (1) Lithium nitrate, nickel acetate, manganese acetate and aluminum nitrate are fully dissolved with deionized water respectively in a molar ratio of 1.10:0.4:1.5:0.05, each solution after dissolving is mixed in a clean large beaker, and Finally, citric acid is mixed in, wherein in order to prevent a small amount of volatilization of lithium under high temperature environment, lithium nitrate is excessively 5%, stirring continuously and adding ammonia water to adjust the pH at 7-8, the total amount of nickel acetate, manganese acetate and aluminum nitrate and the mole of citric acid The ratio is 1:1;

[0040] (2) Under the condition of 80°C, the mixed solution obtained in step (1) was evaporated at a constant temperature for 9 hours under the condition of a stirring speed of 300 rpm to obtain a sol; ...

Embodiment 3

[0047] Embodiment three: the preparation method of the positive electrode material of high-voltage lithium-ion battery with spinel structure, comprises the following steps:

[0048] (1) The molar ratio of lithium nitrate, nickel acetate, manganese acetate and chromium nitrate is 1.10:0.4:1.5:0.05 (wherein in order to prevent a small amount of volatilization of lithium under high temperature environment, lithium nitrate is excessive 5%), respectively with deionized water Dissolve fully, mix each solution after dissolving in a clean large beaker, and finally mix in citric acid, stir constantly and add ammonia water to adjust pH at 7~8, the total amount of described nickel acetate, manganese acetate and chromium nitrate and The molar ratio of citric acid is 1:1;

[0049] (2) Under the condition of 80°C, the mixed solution obtained in step (1) was evaporated at a constant temperature for 9 hours under the condition of a stirring speed of 400 rpm to obtain a sol;

[0050] (3) Put ...

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Abstract

The invention relates to a high-voltage lithium oil battery positive electrode material with a spinel structure and a preparation method of the high-voltage lithium oil battery positive electrode material. The chemical general formula of the lithium oil battery positive electrode material is Li[M1aNibM2cMn1.5]O4, wherein a is larger than or equal to 0.025 and smaller than or equal to 0.05, b is larger than or equal to 0.4 and smaller than or equal to 0.45, c is larger than or equal to 0.025 and smaller than or equal to 0.05, and M1 and M2 are one or more of Mg, Zn, Fe, Li, Al, Cr and Co. During preparation, a soluble lithium source, a nickel source, a manganese source, M1 salt and M2 salt are weighed according to mole ratios firstly to prepare gel, the gel is then heated and dried, and the lithium oil battery positive electrode material is obtained after burning is conducted twice and the gel is cooled to the room temperature. The preparation method is simple, steps are easy to operate, the positive electrode material prepared from a lithium-enriched LiNi0.5Mn1.5O4 positive electrode material formed by doping Li and other metal elements is uniform in particle, is of the spinel structure and is high in crystallinity, the material stability is improved, circulation and rate capability of the material can be effectively increased through the introduced doping elements, the nickel content is decreased, the production cost is reduced, and meanwhile pollution to the environment is reduced.

Description

technical field [0001] The invention relates to a high-voltage lithium-ion battery cathode material with a spinel structure and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in various mobile electronic devices and high-energy devices, such as smartphones, notebooks, and electric vehicles, due to their advantages such as large specific energy, low self-discharge, long cycle life, and good safety performance. [0003] Among many cathode materials, LiCoO 2 Successfully commercialized and widely used, cobalt is a relatively scarce and expensive resource and pollutes the environment. Compared to LiCoO 2 , spinel LiMn 2 o 4 The cathode material has the advantages of abundant resources, low cost, no environmental pollution, and good safety performance, and is considered to be the most promising alternative to LiCoO. 2 positive electrode material. However, stud...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张海朗张磊
Owner JIANGNAN UNIV
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