Synthesis of modified lithium-rich layered positive electrode material doped with anions of F<->, Cl<-> and Br<->

A lithium-rich cathode material and cathode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of low rate performance and first Coulombic efficiency, and achieve superior electrochemical performance, increased specific surface area, and high capacity. Effect

Inactive Publication Date: 2016-08-24
JIANGNAN UNIV
View PDF3 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although lithium-rich cathode materials have the above advantages, their rate performance and fir

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
  • Synthesis of modified lithium-rich layered positive electrode material doped with anions of F&lt;-&gt;, Cl&lt;-&gt; and Br&lt;-&gt;
  • Synthesis of modified lithium-rich layered positive electrode material doped with anions of F&lt;-&gt;, Cl&lt;-&gt; and Br&lt;-&gt;
  • Synthesis of modified lithium-rich layered positive electrode material doped with anions of F&lt;-&gt;, Cl&lt;-&gt; and Br&lt;-&gt;

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1: Lithium nitrate, nickel nitrate, manganese acetate, and cobalt nitrate are weighed and dissolved in deionized water in a molar ratio of 1.26:0.15:0.55:0.1, and tartaric acid equivalent to the total molar number of metal salts (0.8mol) is added Mix the aqueous solution evenly, adjust the pH of the solution to 7 with concentrated ammonia water, and stir it in a constant temperature water bath at 70°C at a speed of 350 rpm for about 14 hours until it becomes gelatinous. The gel was baked in an oven at 90°C for 15 hours, and then placed in a muffle furnace and heated to 350°C for 8 hours for pre-sintering to obtain a precursor. After cooling and grinding, it was placed in a muffle furnace and heated to 850°C for calcination for 20 hours. , cooled and ground to obtain the final product Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 2 .

[0025] With Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 2 The positive electrode material is assembled into a half-battery, and the disch...

Example Embodiment

[0026] Implementation case two: Lithium acetate, nickel acetate, manganese acetate, cobalt nitrate, and lithium chloride are weighed and dissolved in deionized water in a molar ratio of 1.23: 0.15: 0.55: 0.1: 0.03, and added with the total moles of metal salt ( 0.8 mol) of tartaric acid aqueous solution, mixed evenly, the pH value of the solution was adjusted to 8 with ammonia water, and stirred at a speed of 400 rpm in a constant temperature water bath at 90°C for about 12 hours until gelatinous. The gel was baked in an oven at 120°C for 12 hours, then placed in a muffle furnace and heated to 500°C for 6 hours for pre-sintering to obtain a precursor, cooled and ground, then placed in a muffle furnace and heated to 850°C for calcination for 12 hours , cooled and ground to obtain the final product Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 1.97 Cl 0.03 .

[0027] With Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 1.97 Cl 0.03 The positive electrode material is assembled into a half ...

Example Embodiment

[0028]Implementation case three: Lithium nitrate, nickel acetate, manganese nitrate, cobalt acetate, and lithium chloride are weighed and dissolved in deionized water in a molar ratio of 1.21: 0.15: 0.55: 0.05: 0.05, and added with the total moles of metal salt ( 0.8mol) equivalent citric acid aqueous solution, mix evenly, adjust the pH value of the solution to 7 with ammonia water, stir at a speed of 500 rpm in a constant temperature water bath at 80°C for about 10 hours to gel. The gel was baked in an oven at 120°C for 12 hours, and then placed in a muffle furnace and heated to 500°C for 6 hours for pre-sintering to obtain a precursor. After cooling and grinding, it was placed in a muffle furnace and heated to 900°C for calcination for 12 hours. , cooled and ground to obtain the final product Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 1.95 Cl 0.05 .

[0029] With Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 1.95 Cl 0.05 The positive electrode material is assembled into a half ba...

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 doping modified lithium-rich layered positive electrode material and a preparation method thereof, in particular to a new novel lithium-rich layered positive electrode through doping modification on a material by anions of F<->, Cl<-> and Br<-> according to a certain proportion, and belongs to the technical field of a lithium ion battery. The synthesis method comprises the following steps of firstly, weighing a lithium salt, a metal nitrate and a non-metal salt according to mole ratios, dissolving the lithium salt, the metal nitrate and the non-metal salt in deionized water, adding citric acid, and adjusting a pH value to be 7-8 with ammonia; secondly, heating, stirring and reacting the obtained mixture to obtain wet gel, drying the wet gel to obtain dry gel, and pre-sintering the dry gel to obtain a precursor; and finally, carrying out high-temperature roasting and grinding to obtain the lithium-rich positive electrode Li[Li<0.2>Ni<0.15>Mn<0.55>Co<0.1>]O<2-x>M<x> (M is F, Cl or Br) (0<=x<0.1), namely the modified layered lithium-rich positive electrode material. The positive electrode material prepared according to the method is small and uniform in particle, smooth in surface and high crystallization property, and thus, the positive electrode material has relatively high discharge specific capacitance and favorable rate performance; and by co-doping, the cycle performance and the initial coulombic efficiency of the positive electrode material can be improved, the irreversible capacitance loss is reduced, and thus, the positive electrode material has great industrial significance.

Description

technical field [0001] The invention relates to an anion-doped modified layered lithium-rich cathode material and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] In today's world, with the rapid development of science and technology, lithium secondary batteries occupy an important position in portable electronic products, medical equipment and other fields because of their advantages such as environmental protection, high specific capacity, and "no memory effect". The composition of lithium-rich cathode materials is complex, xLi 2 MnO 3 ·(1-x)LiMO 2 The combination of M in the structure is changeable. Looking at this structure, it has α-NaFeO 2 A layered configuration in which Na is replaced by Li and Fe is replaced by Li and a class of transition metal ions (e.g., nickel, manganese, cobalt). Belongs to the hexagonal crystal system, R-3m space group, Li occupies the 3a position, transition metal occup...

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): H01M4/505H01M4/525H01M4/1315
CPCY02E60/10
Inventor 张海朗唐婷
Owner JIANGNAN UNIV
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