Coated spherical Li-rich cathode material and preparation method thereof

A lithium-rich cathode material and coating technology, which is applied in the field of lithium-ion battery cathode materials and its preparation, can solve the problems of destroying the surface lattice structure of materials, poor material rate performance, poor compatibility, etc., and achieve simple and time-saving operation , short diffusion path and small particle size

Inactive Publication Date: 2014-03-26
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although lithium-rich cathode materials have excellent electrochemical performance, their shortcomings limit their practical applications: (1) Li 2 MnO 3 The components have poor conductivity, which leads to poor rate performance of

Method used

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  • Coated spherical Li-rich cathode material and preparation method thereof
  • Coated spherical Li-rich cathode material and preparation method thereof
  • Coated spherical Li-rich cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of carbon-coated spherical lithium-rich materials Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 According to the stoichiometric ratio of Li, Ni, Co, Mn in the target product, accurately weigh the corresponding nitrate, use citric acid as complexing agent, according to the total molar weight of metal salt: molar weight of citric acid=1:1, Prepare a citric acid solution, add it into the metal nitrate mixture at a certain speed, and adjust the pH to 5; keep the mixture at a constant temperature of 80 o C stirring, after sol, gel, and curing, put the cured material sample in the air atmosphere of the tube furnace at 550 o C pre-decomposition 3h, then 800 o C roasting for 12h, grinding and sieving to obtain Li with a particle size of 30-40nm 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 particles.

[0029] Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 Nanoparticles and glucose were mixed at a mass ratio of 1:0.5 to form a uniformly dispersed suspension with a solid content of about ...

Embodiment 2

[0032] Preparation of carbon-coated spherical lithium-rich materials Li 1.2 mn 0.56 Ni 0.13 co 0.13 o 2 According to the stoichiometric ratio of each element of Li, Ni, Co, Mn in the target product, accurately weigh the corresponding acetate, use polyacrylic acid as complexing agent, according to the total molar weight of metal salt: polyacrylic acid molar weight=1:1.3 , prepare polyacrylic acid solution, add metal acetate mixed solution at a certain speed, adjust pH to 2; keep mixed solution constant temperature 80 o C stirring, after sol, gel, and curing, put the cured material sample in the air atmosphere of the tube furnace at 400 o C pre-decomposition 3h, then 800 o C roasting for 12h, grinding and sieving to obtain Li with a particle size of 20-30nm 0.2 mn 0.54 Ni 0.13 co 0.13 particles.

[0033] Li 0.2 mn 0.54 Ni 0.13 co 0.13 Nanoparticles and polyvinylpyrrolidone were mixed at a mass ratio of 1:0.05 to form a uniformly dispersed suspension with a solid co...

Embodiment 3

[0035] Preparation of carbon-coated spherical lithium-rich materials Li 1.2 mn 0.56 Ni 0.13 co 0.13 o 2 Accurately weigh any proportion of acetate and nitrate according to the stoichiometric ratio of Li, Ni, Co, Mn metal elements in the target product, use polyacrylic acid as complexing agent, according to the total molar weight of metal salt: polyacrylic acid mole Quantity = 1:1.3, make polyacrylic acid solution, add metal acetate mixture at a certain speed, adjust pH to 2; keep the temperature of the mixture at 80 o C stirring, after sol, gel, and curing, put the cured material sample in the air atmosphere of the tube furnace at 550 o C pre-decomposition 3h, then 800 o C roasting for 12h, grinding and sieving to obtain Li with a particle size of 20-30nm 0.2 mn 0.54 Ni 0.13 co 0.13 particles.

[0036] Li 0.2 mn 0.54 Ni 0.13 co 0.13 Nanoparticles, glucose and polyvinylpyrrolidone were mixed according to the mass ratio of 1:0.4:0.02 to form a uniformly dispersed s...

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Abstract

A coated spherical Li-rich cathode material comprises a main phase Li-rich cathode material, wherein the main phase Li-rich cathode material is uniformly coated with a coating phase; the general formula of the main phase Li-rich cathode material is xLi2MnO3*(1-x) LiMO2, and x is larger than zero and smaller than one; the coating phase is a carbon layer; the mass ratio of a main phase to the coating phase is 1:(1%-12%); and the average particle diameter of a primary particle of a nanoscale Li-rich cathode material is 20-60 nm, and the average particle diameter of the coated spherical Li-rich cathode material is 1-15 mu m. A preparation method of the coated spherical Li-rich cathode material comprises steps as follows: step one, the primary particle of the nanoscale Li-rich cathode material is prepared with a sol-gel method; and step two, the coated spherical Li-rich cathode material is prepared.

Description

technical field [0001] The invention relates to a lithium-ion battery cathode material and a preparation method thereof, in particular to a coated spherical lithium-rich cathode material and a preparation method thereof. Background technique [0002] In recent years, due to the lithium-rich cathode material xLi 2 MnO 3 ·(1-x)LiMO 2 The advantages of high specific capacity (200–300mAh / g), good cycle performance, wide charge and discharge range, and environmental friendliness have sparked a research boom and become LiCoO 2 One of the most promising alternatives. The methods for synthesizing lithium-rich materials mainly include high-temperature solid-phase method, co-precipitation method, sol-gel method, hydrothermal method, and spray drying method. [0003] The co-precipitation method is the most commonly used method for synthesizing the precursors of ternary cathode materials. This method can achieve atomic-level mixing. However, in practice, different types of cations d...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/366H01M4/505H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 关成善宗继月孟博郝文娟
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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