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Method for coating and modifying lithium ion battery positive electrode material

A lithium-ion battery, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of coating particle agglomeration, uneven coating, uneven coating, etc., to achieve small volume change, stable structure, The effect of high commercial value

Inactive Publication Date: 2017-09-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are three traditional methods for the coating of positive electrode materials: (1) direct mechanical mixing coating: direct mechanical mixing will lead to uneven coating, and some areas of the surface are exposed, and coating particles will also agglomerate in the coated part
(2) Chemical Vapor Deposition (CVD): Although the positive electrode material can be densely and continuously coated, due to the method, those non-conductive and non-porous materials are also coated on the surface
(3) Co-precipitation method (co-ppt): The co-precipitation method also inevitably causes the agglomeration of coating particles, uneven coating, and coating cracks

Method used

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  • Method for coating and modifying lithium ion battery positive electrode material
  • Method for coating and modifying lithium ion battery positive electrode material
  • Method for coating and modifying lithium ion battery positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The method for encapsulating and modifying the cathode material of a lithium ion battery described in this embodiment specifically includes the following steps:

[0022] (1) At room temperature, make a mixed solution of butyl titanate, terephthalic acid, methanol and dimethylformamide according to the molar ratio of 1:2:15:60; then the positive electrode material LiNi 0.5 co 0.2 mn 0.3 o 2 Pour into the above mixed solution, and accompanied by mechanical stirring and ultrasonic vibration for a long enough time, so that the medicine and the positive electrode material LiNi 0.5 co 0.2 mn 0.3 o 2 Mix evenly, where the positive electrode material LiNi 0.5 co 0.2 mn 0.3 o 2 The molar ratio to butyl titanate is 100:0.5.

[0023] (2) Transfer the homogeneously mixed solution in (1) to a polytetrafluoroethylene-lined autoclave whose temperature has risen to 120 ° C, and keep it for 12 hours to react to obtain the initial positive electrode material LiNi 0.5 co 0.2 m...

Embodiment 2

[0028] (1) At room temperature, make a mixed solution of n-butyl titanate, formic acid, diaminoterephthalic acid and dimethylformamide according to the molar ratio of 1:1.5:20:60; then the positive electrode material LiNi 0.5 co 0.2 mn 0.3 o 2 Pour into the above mixed solution, and accompanied by mechanical stirring and ultrasonic vibration for a long enough time, so that the medicine and the positive electrode material LiNi 0.5 co 0.2 mn 0.3 o 2 Mix evenly, where the positive electrode material LiNi 0.5 co 0.2 mn 0.3 o 2 The molar ratio to n-butyl titanate is 100:1.

[0029] (2) Transfer the homogeneously mixed solution in (1) to a polytetrafluoroethylene-lined autoclave whose temperature has risen to 120°C, and keep it for 24 hours to obtain the initial positive electrode material LiNi 0.5 co 0.2mn 0.3 o 2 and MOFs (MIL-125-NH 2 @Ti) mixture.

[0030] (3) Suction filter the turbid liquid obtained from the reaction in (2), then vacuum-dry the obtained filter c...

Embodiment 3

[0034] (1) At room temperature, make a mixed solution of titanium tetraisopropoxide, P123, terephthalic acid and dimethylformamide according to the molar ratio of 1:1.5:25:60; then the positive electrode material LiNi 0.5 co 0.2 mn 0.3 o 2 Pour into the above mixed solution, and accompanied by mechanical stirring and ultrasonic vibration for a long enough time, so that the medicine and the positive electrode material LiNi 0.5 co 0.2 mn 0.3 o 2 Mix evenly, where the positive electrode material LiNi 0.5 co 0.2 mn 0.3 o 2 The molar ratio to isopropyl titanate is 100:1.

[0035] (2) Transfer the homogeneously mixed solution in (1) to a polytetrafluoroethylene-lined autoclave whose temperature has risen to 120°C, and keep it for 36 hours to obtain the initial positive electrode material LiNi 0.5 co 0.2 mn 0.3 o 2 and a mixture of MOFs (MIL-125@Ti).

[0036] (3) Suction filter the turbid liquid obtained from the reaction in (2), then vacuum-dry the obtained filter cake...

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Abstract

The invention discloses a method for coating and modifying a lithium ion battery positive electrode material, and belongs to the technical field of a new energy lithium battery positive electrode material. The method comprises the steps of uniformly mixing the positive electrode material in a solution of a template agent, an organic solvent, a ligand and an organic titanium salt; transferring the uniformly-mixed solution to a high-pressure reaction kettle, and automatically assembling the organic metal salt and the ligand into a metal organic framework material (MOFs) under high temperature and high pressure and under an effect of the template agent, wherein the MOFs is uniformly coated on a surface of the positive electrode material; and performing calcination on the obtained product after filtering, drying and grinding to obtain the final lithium ion battery positive electrode material coated with porous titanium dioxide. With the lithium ion battery positive electrode material prepared by the method, the high- and low-temperature performance of the battery is improved; and the titanium dioxide with a stable structure is coated on the surface of the positive electrode material, and the cycle stability of the positive electrode material can be remarkably improved.

Description

technical field [0001] The invention relates to a method for coating and modifying positive electrode materials of lithium ion batteries by using metal organic framework materials (MOFs), and belongs to the technical field of new energy lithium battery positive electrode materials. Background technique [0002] The currently used cathode materials for lithium-ion batteries all have some inherent shortcomings, such as poor cycle stability due to phase transition at high voltage, low electronic conductivity and poor rate performance due to Li / Ni mixed arrangement, which is easy to mix with CO in the air 2 and H 2 0 reacts to form LiCO 3 and LiOH, resulting in high-temperature gas expansion and cycle performance degradation, Ni in the state of high delithiation 4+ The strong oxidizing properties tend to reduce to Ni 3+ while releasing O 2 Poor thermal stability is caused. In response to these problems, it has been found that the electrochemical performance of positive elec...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525
CPCH01M4/485H01M4/505H01M4/525Y02E60/10
Inventor 张正富吴天涯孙冬徐顺涛王梓
Owner KUNMING UNIV OF SCI & TECH
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