A surface-treated modified lithium-rich manganese-based layered positive electrode material and its preparation method

A positive electrode material and surface treatment technology, applied to battery electrodes, structural parts, electrical components, etc., can solve problems such as poor rate performance, cycle capacity attenuation, and large irreversible capacity loss for the first time, and achieve high capacity, stable internal structure, and elimination of The effect of oxygen deficiency

Active Publication Date: 2018-10-02
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0005] The technical problem to be solved in the present invention is to overcome the problems of large first irreversible capacity loss, cycle capacity attenuation, and poor rate performance of lithium-ion secondary battery lithium-rich manganese-based layered positive electrode materials, and propose to use low-temperature solid-phase method in lithium-rich Manganese-based layered cathode materials using NH 4 BF 4 The solution of ion exchange on the surface of electrode materials realizes a preparation method of lithium-rich manganese-based layered cathode materials with high capacity, good stability and good rate performance

Method used

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  • A surface-treated modified lithium-rich manganese-based layered positive electrode material and its preparation method
  • A surface-treated modified lithium-rich manganese-based layered positive electrode material and its preparation method
  • A surface-treated modified lithium-rich manganese-based layered positive electrode material and its preparation method

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preparation example Construction

[0026] Another object of the present invention is to provide a method for preparing the above-mentioned surface-treated modified lithium-rich manganese-based layered positive electrode material, the method comprising the following steps:

[0027] Step 1. Prepare the mixture: according to the molecular formula Li[Li x Mn 1-x-y M y ]O 2 The ratio of , the theoretical calculation ratio is (Mn 1-x-y M y ) hydroxide precursor and lithium hydroxide are added into the mixing tank for full mixing and stirring until uniform, and the element composition is Li[Li x Mn 1-x-y M y ]O 2 mixture;

[0028] Step 2. Sintering treatment: the elemental composition obtained in step (1) is Li[Li x Mn 1-x-y M y ]O 2 The mixture was heated to 400-450°C for 1-4h at a heating rate of 5-10°C / min, and then sintered at a constant temperature of 600-1000°C for 10-30h at a heating rate of 5-10°C / min. After the reaction was completed , the sintered product is ball-milled to obtain a lithium-rich ...

Embodiment 1

[0033] NH of this embodiment 4 BF 4 Coated lithium-rich manganese-based layered lithium-ion battery cathode material, is in the chemical formula Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 The outer surface of the layered Li-rich manganese-based cathode material conducts NH 4 BF 4 Treatment; in the example the treatment amount is NH 4 BF 4 / Li[Li 0.2 Mn 0.54 Ni0 .13 Co 0.13 ]O 2 The mass ratio of 3%.

[0034] Its preparation method is:

[0035] Step 1. Prepare the mixture: Li according to the molecular formula 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 The ratio of 10g of hydroxide precursor with molar ratio of Ni:Co:Mn=13:13:54 and 7.3g of LiOH·H with a purity of 96% 2 O, added to the mixing tank, mixed uniformly, and the element composition was Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 mixture;

[0036] Step 2. Sintering and grinding: The elemental composition obtained in step 1 is Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 The mixture was kept at 450 °C for 1 h at a heating rat...

example 3

[0040] NAF / Li[Li of Example 3 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 =2%;

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Abstract

The invention relates to a method for ion exchange surface treatment of a lithium-rich cathode material for realizing surface NH4BF4 ion exchange of a lithium-rich manganese-based layered cathode material used for a lithium ion battery through utilizing a low-temperature solid-phase method, and the prepared cathode material has good cycling stability and rate capability. A preparation method for the cathode material comprises the following steps of (1) preparing a mixture of raw materials; (2) sintering and carrying out powder handling; (3) uniformly mixing an active material and a surface treatment material for a long time; and (4) carrying out low-temperature heat treatment on the mixed material for 24-48 hours to obtain a positive active material after surface treatment. The prepared lithium-rich manganese-based layered cathode material subjected to NH4BF4 ion exchange surface treatment has the advantages of high capacity, small first capacity loss, high structural stability, good rate capability and the like. An Mn element is taken as a basic material particularly, so that the cost is low, and the cathode material is particularly suitable for large battery equipment, such as batteries of electric vehicles and energy storage batteries.

Description

Technical field: [0001] The invention relates to a lithium ion battery positive electrode material and a preparation method thereof, in particular to a NH 4 BF 4 A lithium-rich manganese-based layered cathode material modified by surface treatment and a preparation method thereof. Background technique: [0002] After entering the 21st century, modern civilization based on fossil fuels has experienced more than two hundred years of development, bringing two serious problems of energy and environment to the earth and human beings. The pursuit of new and environmentally friendly renewable energy has become the sustainable development of human society. inevitable choice. As an efficient energy storage and conversion device, chemical power supply has the characteristics of high energy density, portability, no noise, small self-discharge, long life and strong environmental adaptability. , has gradually become an irreplaceable new energy device. Among them, lithium-ion batterie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/139H01M10/0525
CPCH01M4/139H01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李建玲徐国峰李新平
Owner UNIV OF SCI & TECH BEIJING
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