Mixed positive-pole material for lithium ion battery

A technology of mixing positive electrode materials and lithium-ion batteries, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of inconsistency in the delithiation amount, easy occurrence of mixed discharge, and deterioration of battery performance, so as to improve the compaction density. Low, guaranteed lithium impurity content, simple preparation process

Active Publication Date: 2013-04-03
DONGGUAN AMPEREX TECH
View PDF6 Cites 37 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, ternary materials have attracted much attention in recent years, but the material also has certain defects: its actual compacted density is only 3.6g/cm 3 , low discharge voltage platform and strong water absorption; it is particularly noteworthy that: Li in the structure + and Ni 2+ It is easy to mix and discharge, which leads to the release of active oxygen and makes the high-priced nickel ions easy to catalyze the decomposition of the electrolyte, so that the lithium-ion battery made of ternary materials will generate a large amount of gas when stored at high temperature, which will deteriorate the performance of the battery, especially for the use of aluminum Plastic composite film is used as the outer packaging of lithium-ion batteries, and the outer shell is relatively soft. The generation of gas will cause the rapid expansion and deformation of the battery, which will bring serious safety hazards and limit its use.
However, the high-nickel ternary material coated with a layer of metal oxide in

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
  • Mixed positive-pole material for lithium ion battery
  • Mixed positive-pole material for lithium ion battery
  • Mixed positive-pole material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: This embodiment provides a lithium-ion battery hybrid positive electrode material, the positive electrode material is LiCoO 2 and LiNi 0.5 co 0.2 mn 0.3 o 2 The hybrid material, among them, LiCoO 2 The median particle size D50 is 10μm, LiNi 0.5 co 0.2 mn 0.3 o 2 The particle size of the single crystal particles is 1 μm, LiNi 0.5 co 0.2 mn 0.3 o 2 and LiCoO 2 The mass ratio is 2:8, through the LiCoO 2 and LiNi 0.5 co 0.2 mn 0.3 o 2 Al was added during the mixing process 2 o 3 And after sintering, making Al 2 o 3 Evenly distributed in LiNi 0.5 co 0.2 mn 0.3 o 2 and LiCoO 2 surface, and makes LiNi 0.5 co 0.2 mn 0.3 o 2 and LiCoO 2 A molten network layer is formed between them.

[0028] Among them, the LiNi wrapped in the molten network layer 0.5 co 0.2 mn 0.3 o 2 and LiCoO 2 The total number of particles is from 2 to 50.

[0029] Melted network layer wrapped LiNi 0.5 co 0.2 mn 0.3 o 2 and LiCoO 2 The final diam...

Embodiment 2

[0033] Embodiment 2: The difference from Embodiment 1 is: LiCoO 2 The median particle size D50 of LiNi is 12μm; LiNi 0.5 co 0.2 mn 0.3 o 2 The particle size of the single crystal particles is 2 μm, and the others are the same as those in Example 1, and will not be repeated here.

Embodiment 3

[0034] Embodiment 3: Different from Embodiment 1: the positive electrode material is LiCo 0.9 Mg 0.1 o 2 and LiNi 0.5 co 0.2 Mg 0.3 o 2 of hybrid materials, where LiCo 0.9 Mg 0.1 o 2 The median particle size D50 of LiNi is 15μm; LiNi 0.5 co 0.2 Mg 0.3 o 2 The particle size of the single crystal particles is 3 μm, LiCo 0.9 Mg 0.1 o 2 and LiNi 0.5 co 0.2 Mg 0.3 o 2 The mass ratio is 1:5.

[0035] The sintering is LiCo 0.9 Mg 0.1 o 2 、LiNi 0.5 co 0.2 Mg 0.3 o 2 and Al 2 o 3 After the three are mixed evenly, the temperature is raised at a rate of 3°C / min, and the mixture is burned at a constant temperature of 900°C in an air atmosphere for 4 hours.

[0036] Others are the same as in Embodiment 1, and will not be repeated here.

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
Median particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Median particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to a mixed positive-pole material for a lithium ion battery. According to the mixed positive-pole material for the lithium ion battery, the positive-pole material is a mixed material of a lithium-cobalt-oxide-based active substance A and a lithium-nickel-cobalt-manganese-based ternary active substance B; the median particle diameter of the lithium-cobalt-oxide-based active substance A is smaller than or equal to 15 microns, and the particle diameter of single-crystal particles of the lithium-nickel-cobalt-manganese-based ternary active substance B is greater than or equal to 1.0 micron; and after adding a metal oxide and sintering during the mixing of the lithium-cobalt-oxide-based active substance A and the lithium-nickel-cobalt-manganese-based ternary active substance B, the metal oxide is uniformly distributed on the surfaces of the lithium-cobalt-oxide-based active substance A and the lithium-nickel-cobalt-manganese-based ternary active substance B, and a molten reticular layer is formed between the lithium-cobalt-oxide-based active substance A and the lithium-nickel-cobalt-manganese-based ternary active substance B. When the mixed positive-pole material provided by the invention is used at high voltage, the gram capacity is higher than or equal to 156 mAh/g, and the compaction density is higher than or equal to 4.05 g/cm<3>; and at high voltage, the lithium ion battery has the characteristics of good cycle performance, high temperature storage and safety.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery mixed positive electrode material with high capacity and high compaction density. Background technique [0002] With the multi-functionalization of consumer electronic products, people have higher and higher requirements on the endurance, service life, safety performance and price of lithium-ion batteries as the power supply of consumer electronic products. The cathode material is one of the key materials that restrict the cost performance of lithium-ion batteries. Improving the capacity and compaction density of the cathode material is the two main aspects to improve the battery life of lithium-ion batteries. [0003] At present, the widely used cathode material is mainly LiCoO 2 , the compacted density of the positive electrode membrane composed of this material can reach 4.1g / cm 3 , and the lithium-ion battery using the positive electrode ...

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
IPC IPC(8): H01M4/62H01M4/48
CPCY02E60/10
Inventor 谭欣欣阮丁山柳娜陈杰邝泉王梦
Owner DONGGUAN AMPEREX TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap