Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of positive electrode material of lithium ion battery and its preparation and application

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as adverse effects, insufficient stability, and decreased energy density

Active Publication Date: 2021-05-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method of pre-intercalating lithium additives in the positive electrode is effective, it will significantly reduce the energy density of the battery.
The method of mixing lithium-rich phase materials and ordinary materials also has obvious effects, and will not significantly reduce the energy density, but the converted materials are not stable enough due to structural differences
In the method disclosed in the publication number CN107768657A, the shell part of the core-shell structure is used to realize the pre-intercalation of lithium, which has a significant improvement in the first cycle efficiency and cycle performance, but the decline in energy density cannot be completely avoided. The introduction will adversely affect the structure of the core body material
For homogeneous materials, it is difficult to achieve a complete homogeneity after the intercalation of lithium in the inner and outer phases due to the different lithium ion extraction capabilities and speeds at different particle size positions, resulting in instability of the material in the later charge and discharge process.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of positive electrode material of lithium ion battery and its preparation and application
  • A kind of positive electrode material of lithium ion battery and its preparation and application
  • A kind of positive electrode material of lithium ion battery and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] MnO 2 and Li 2 CO 3 Mix evenly according to the molar ratio of 1:0.25, sinter at 850°C for 18 hours, cool naturally, crush and classify to obtain the LiMn body structure material with a particle size of 0.1-2μm 2 o 4 ; then the LiMn 2 o 4 with Li 2 CO 3 , water mixed evenly according to the molar ratio of 1:0.1:2, roasted at 800°C for 12 hours, cooled naturally, crushed, and classified to obtain a gradient structure with a particle size of 0.1-2μm (the molar concentration of Li element increases with the particle size from the outside Gradually decrease to the inside, and its range changes gradually from the particle size from the outside to the inside from 1.5 to 1.001) Li 1.2 mn2 o 4 Cathode material.

Embodiment 2

[0031] Will Mn 3 o 4 Mix with LiOH according to the molar ratio of 1:1.5, sinter at 720°C for 24 hours, cool naturally, crush and classify to obtain LiMn, the bulk structure material 2 o 4 ; then the LiMn 2 o 4 Mix with LiOH and ethanol in a molar ratio of 1:0.2:5, bake at 700°C for 8 hours, naturally cool, crush, and classify to obtain a gradient structure (the molar concentration of Li element gradually decreases with the particle size from the outside to the inside, and its The range is gradually changed from particle size from outside to inside from 1.5 to 1.001) Li 1.2 mn 2 o 4 Cathode material.

Embodiment 3

[0033] MnCO 3 and Li 2 CO 3 Mix evenly according to the molar ratio of 1:0.25, sinter at 850°C for 36 hours, naturally cool, crush and classify to obtain the bulk structure LiMn 2 o 4 ; then the LiMn 2 o 4 with Li 2 CO 3 , Higher aliphatic alcohols are mixed evenly according to the molar ratio of 1:0.1:3, roasted at 750 ° C for 10 hours, naturally cooled, crushed, and graded to obtain a gradient structure (the molar concentration of Li element gradually decreases with the particle size from the outside to the inside, and its The range is gradually changed from particle size from outside to inside from 1.5 to 1.001) Li 1.2 mn 2 o 4 Cathode material.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
thicknessaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to a lithium-ion battery cathode material and its preparation and application. The lithium-ion battery cathode material is a lithium-rich material Li 1+x mn 2 o 4 , where the range of x is 0≤x≤0.5, and the molar concentration of Li element decreases gradually with the particle size from the outside to the inside. During the formation of lithium-ion batteries, Li 1+x mn 2 o 4 The material can extract all the lithium ions infiltrated by the X part, and the extracted lithium ions are mainly used to form an SEI film on the surface of the negative electrode, thereby reducing the capacity loss of the positive electrode material, so that the lithium-ion battery has a higher initial Coulombic efficiency.

Description

Technical field: [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery cathode material, a preparation method and a lithium ion battery. Background technique: [0002] Lithium-ion batteries have the advantages of high specific energy, small self-discharge coefficient, good efficiency, and long cycle life, and are widely used in portable power supply equipment applications and power / hybrid battery applications and research and development. The capacity matching of positive and negative electrode materials is one of the key parameters in the design process of lithium-ion batteries, which directly affects the first cycle efficiency and cycle life of lithium-ion batteries. Usually, the design capacity of the negative electrode material is 10-15% more than that of the positive electrode, mainly because during the formation process, the SEI film containing lithium compounds is formed on the negative electrode interfa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/505H01M10/0525
CPCH01M4/485H01M4/505H01M10/0525Y02E60/10
Inventor 张洪章宋子晗李先锋张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI