Method for preparing lithium-rich cathode materials by sol-gel self-propagating combustion method

A lithium-rich positive electrode material, self-propagating combustion technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of poor conductivity and poor rate performance of materials, and achieve short diffusion path, small particle size, easy operation and time saving effect

Active Publication Date: 2017-02-22
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing lithium-rich cathode materials by sol-gel self-propagating combustion method. The method has simple process flow, good stoichiometric ratio, high purity and good rate performance, and can improve the existing Li 2 MnO 3 Components lead to poor electrical conductivity and poor rate performance of the material

Method used

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  • Method for preparing lithium-rich cathode materials by sol-gel self-propagating combustion method
  • Method for preparing lithium-rich cathode materials by sol-gel self-propagating combustion method
  • Method for preparing lithium-rich cathode materials by sol-gel self-propagating combustion method

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Embodiment example 1

[0031] Preparation of lithium-rich cathode materials Li (Li 0.08 Ni 0.38 mn 0.54 )O 2 According to the stoichiometric ratio of Li, Ni and Mn elements in the target product, accurately weigh the corresponding lithium nitrate, nickel nitrate and manganese acetate, according to the total mass of metal salt: ethanol mass = 1:8, prepare the solution, and stir at room temperature Dissolved at 80 o C, carry out mechanical stirring and evaporation in a constant temperature water bath, transfer it to a crucible after it becomes a gelatinous transparent substance, place the crucible in a muffle furnace and burn it at 350°C for 1 hour, so that a self-propagating combustion reaction occurs, and the burned The ashes were ground and placed in a muffle furnace for calcination at 850°C for 16h in an oxygen atmosphere. Grind and pass through a 400-mesh sieve to obtain Li (Li 0.08 Ni 0.38 mn 0.54 )O 2 Cathode material.

[0032] The synthesized Li (Li 0.08 Ni 0.38 mn 0.54 )O 2 The p...

Embodiment example 2

[0034] Preparation of lithium-rich cathode materials Li (Li 0.08 Ni 0.38 mn 0.54 )O 2 According to the stoichiometric ratio of Li, Ni and Mn in the target product, accurately weigh the corresponding lithium acetate, nickel acetate and manganese acetate, and prepare the solution according to the total mass of metal salt: mass of ethanol = 1:9, and stir at room temperature Add magneton after dissolving, set at 90 oC, conduct magnetic stirring and evaporation in a constant temperature water bath, transfer it to a crucible after it becomes a colloidal transparent substance, place the crucible in a muffle furnace and burn it at 400°C for 0.5h to make it undergo a self-propagating combustion reaction, and burn The final ashes were ground and calcined at 900°C for 12 hours in a muffle furnace under an oxygen atmosphere. Grind and pass through a 400-mesh sieve to obtain Li (Li 0.08 Ni 0.38 mn 0.54 )O 2 Cathode material.

[0035] The synthesized Li (Li 0.08 Ni 0.38 mn 0.54 ...

Embodiment example 3

[0037] Preparation of lithium-rich cathode materials Li (Li 0.08 Ni 0.38 mn 0.54 )O 2 According to the stoichiometric ratio of each element of Li, Ni and Mn in the target product, accurately weigh the corresponding lithium nitrate, nickel acetate and manganese nitrate, and prepare the solution according to the total mass of metal salt: mass of ethanol = 1:10, and stir at room temperature Dissolved at 75 o Stir and evaporate in a constant temperature water bath, transfer it to a crucible after it becomes a colloidal transparent substance, place the crucible in a muffle furnace and burn it at 350°C for 2 hours to make it undergo a self-propagating combustion reaction, and the burned The ashes were ground and calcined at 800°C for 24 hours in a muffle furnace under an oxygen atmosphere. Grind and pass through a 400-mesh sieve to obtain Li (Li 0.08 Ni 0.38 mn 0.54 )O 2 Cathode material.

[0038] The synthesized Li (Li 0.08 Ni 0.38 mn 0.54 )O 2 The positive electrode m...

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Abstract

The invention relates to a method for preparing a positive electrode material rich in lithium via a sol-gel self-propagating combustion method, and belongs to the manufacturing method of a raw material of a lithium battery. The method comprises the following steps: dissolving the salts of lithium, nickel and manganese in an alcohol reagent so as to prepare a solution A; then standing the solution A in a thermostat water bath at a certain temperature and evaporating in a stirring manner so as to obtain a colloidal chelate precursor B; transferring the colloidal chelate precursor B into a crucible, standing in a muffle furnace and carrying out self-propagating combustion at the certain temperature so as to generate an ash material C; grinding the ash material C, then standing in the muffle furnace and calcining for multiple hours at a high temperature and under an oxygen atmosphere; and grinding and screening so as to obtain the anode material rich in lithium. According to the method, the self-propagating combustion reaction can be carried out without a complete gel drying process by adopting the sol-gel method; the synthesized primary particles are in a submicron grade, i.e., the synthesized primary particles are small in particle diameter and short in lithium ion diffusion path, thereby being favorable for deintercalation of lithium ions. Thus, the defects of the material rich in lithium are overcome.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a lithium ion battery positive electrode material Li (Li 0.08 Ni 0.38 mn 0.54 )O 2 method of preparation. Background technique [0002] With the increasing demand for energy and the deepening awareness of the importance of sustainable social and economic development, lithium-ion batteries, which are characterized by environmental protection, high efficiency and high energy, have attracted more and more attention. Applications such as large and medium-sized power tools, energy storage power stations, electric vehicles, and smart grids have put forward higher requirements on the safety, energy density, power density, cycle life, price, and environmental friendliness of lithium-ion batteries. At present, the specific capacity of the negative electrode material of lithium ion battery is usually above 300mAh / g, while the specific ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 关成善宗继月孟博史新明
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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