Polyphase manganese base solid solution composite cathode material and preparation method thereof

A composite cathode material, solid solution technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of poor rate and low temperature performance, low first coulombic efficiency, etc.

Active Publication Date: 2013-04-17
BTR NEW MATERIAL GRP CO LTD
View PDF6 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the problems of low initial coulombic efficiency, poor rate and low-temperature performance of manganese-based solid solution materials in the prior art, one of the purposes of the present invention is to provide a lithium-ion battery with high capacity and initial efficiency, good rate and low-temperature performance Multiphase manganese-based solid solution composite cathode material, by introducing spinel LiMn with rich three-dimensional network structure 1.5-x Ni 0.5-x co 2x o 4 phase and highly conductive uniform graphene thin layer, significantly improving the intrinsic electronic conductivity and ionic conductivity of solid solution materials, effectively solving the above problems

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
  • Polyphase manganese base solid solution composite cathode material and preparation method thereof
  • Polyphase manganese base solid solution composite cathode material and preparation method thereof
  • Polyphase manganese base solid solution composite cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050]Lithium hydroxide 14mol, manganese nitrate 7mol, nickel nitrate 2mol, cobalt nitrate 1mol are evenly mixed and dispersed in the carboxymethyl cellulose solution, stirred until a suspension is formed; Grinding at a speed of 1 / min for 5 hours to obtain a viscous slurry; use a spray dryer to spray dry the above slurry to obtain a spherical precursor with uniform distribution of three metal elements, manganese, nickel and cobalt; place the precursor in a sintering furnace In the process, the temperature was raised to 950°C at a heating rate of 5°C / min, and the temperature was kept for 10 hours. During the roasting process, dry air was continuously introduced at a flow rate of 20mL / min. Obtain heterogeneous manganese-based solid solution cathode material 0.05LiMn 1.4 Ni 0.4 co 0.2 o 4 0.475 Li 2 MnO 3 0.475LiMn 0.4 Ni 0.4 co 0.2 o 2 ; Take a certain amount of graphene by weighing 2:100 according to the mass ratio of graphene and multiphase manganese-based solid solut...

Embodiment 2

[0052] Lithium hydroxide 13.2mol, manganese nitrate 7mol, nickel nitrate 2mol, cobalt nitrate 1mol are uniformly mixed and dispersed in the PVA aqueous solution, stirred until a suspension is formed; The viscous slurry was obtained by grinding at a rotational speed for 5 hours; the above slurry was spray-dried by a spray dryer to obtain a spherical precursor with uniform distribution of three metal elements, manganese, nickel and cobalt; the precursor was placed in a sintering furnace to The heating rate is 5°C / min, the temperature is raised to 950°C, and the temperature is kept for 10 hours. At the same time, dry air is continuously introduced during the roasting process at a flow rate of 20mL / min. Phase Manganese-Based Solid Solution Cathode Material 0.1LiMn 1.4 Ni 0.4 co 0.2 o 4 0.45 Li 2 MnO 3 0.45LiMn 0.4 Ni 0.4 co 0.2 o 2 . Take a certain amount of graphene by weighing 2:100 according to the mass ratio of graphene and multiphase manganese-based solid solution p...

Embodiment 3

[0054] 11.7mol of lithium hydroxide, 7mol of manganese nitrate, 2mol of nickel nitrate, and 1mol of cobalt nitrate were uniformly mixed and dispersed in the carboxymethyl cellulose solution, and stirred until a suspension was formed. The suspension was transferred to a roller mill jar, and ground at a speed of 400r / min for 5h to obtain a viscous slurry. Use a spray dryer to spray-dry the above slurry to prepare a spherical precursor with uniform distribution of three metal elements, manganese, nickel, and cobalt. Put the precursor in a sintering furnace and raise the temperature to 950 at a heating rate of 5°C / min. ℃, keep warm for 10h, and at the same time, dry air is continuously introduced during the calcination process at a flow rate of 20mL / min. After calcination, it is naturally cooled to room temperature, and the multiphase manganese-based solid solution positive electrode material 0.2LiMn is obtained by crushing, grading, and sieving. 1.4 Ni 0.4 co 0.2 o 4 0.4 Li 2...

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

No PUM Login to view more

Abstract

The invention relates to a preparation method of polyphase manganese base solid solution composite cathode material, which is characterized in that manganese salt, nickel salt, cobalt salt and lithium salt are taken as raw materials, novel polyphase manganese base solid solution is prepared, and then nano highly-conductive graphene is composited on the surface of the novel polyphase manganese base solid solution, so that the polyphase manganese base solid solution composite cathode material is obtained. Compared with the prior art, the polyphase manganese base solid solution composite cathode material comprises three solid solution phases, namely, monoclinal layered Li2MnO3 with space group of C2 / m and rocking chair layered LiMn0.5-xNi0.5-xCo2xO2 with space group of R-3m and three-dimensional network structure high-voltage spinel LiMn1.5-xNi0.5-xCo2xO4 with space group of Fd3m, and through introducing the LiMn1.5-xNi0.5-xCo2xO4 phase and the graphene thin layer, the intrinsic electronic conductivity and ionic conductivity of the solid solution are obviously improved, the first irreversible capacity is reduced, and the low-temperature property and rate capability are obviously improved.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular, the invention relates to a multiphase manganese-based solid solution composite positive electrode material and a preparation method thereof. Background technique [0002] High specific energy and high specific power are the inevitable demand for lithium-ion batteries in the future market, and the development of lithium-ion battery cathode materials with high capacity and high rate performance is the key. LiCoO, a commercial cathode material for lithium-ion batteries 2 , LiMn 2 o 4 、LiFePO 4 The discharge specific capacity of these materials is below 200mAh / g, and their energy density is limited. Lithium-rich cathode materials, especially lithium-rich manganese-based cathode materials, have attracted widespread attention due to their ultra-high specific capacity and relatively low price. The currently reported lithium-rich manganese-based cat...

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 Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M4/1391
CPCY02E60/10
Inventor 杨顺毅程林黄友元
Owner BTR NEW MATERIAL GRP CO LTD
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