Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of lithium ion battery high-voltage composite cathode material

A composite cathode material, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of oxygen deficiency, hinder lithium ion insertion and extraction, deterioration of electrochemical performance, etc., achieve easy coating, avoid element The effect of uneven distribution of

Inactive Publication Date: 2015-03-04
HENAN KELONG GRP
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] High-temperature calcination is a common method for preparing such materials, but when the sintering temperature is higher than 700 °C, oxygen deficiency will occur, resulting in a small amount of Mn 4+ reduced to Mn 3+ , so that a 4V voltage platform appears during the charge and discharge process
And LiNi 0.5 mn 1.5 o 4 During the charge and discharge process, when the voltage is close to 5V, the electrolyte on the electrode surface will be continuously oxidized and decomposed, and the decomposition products will be deposited on the electrode surface, hindering the normal intercalation and extraction of lithium ions. As the number of cycles increases, the effective lithium will become less and less, resulting in deterioration of electrochemical performance

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A, nickel sulfate, manganese sulfate that are 0.5: 1.5 by nickel, manganese metal ion mol ratio are dissolved in deionized water, are mixed with the uniform nickel-manganese mixed solution that total concentration is 1mol / L. Pump the mixed solution of metal salt, 3mol / L ammonia water and 2mol / L sodium hydroxide solution into the reaction kettle at the same time, control the pH value of the reaction solution in the reaction kettle to 8.5, control the reaction temperature to 40°C, and control the reaction kettle Stir the material inside for 20h to control the particle size D of co-precipitation 50 = 9 μm. Dissolve nickel sulfate, cobalt sulfate, and manganese sulfate in deionized water with a molar ratio of nickel, cobalt, and manganese metal ions of 0.233:0.233:0.533 to form a uniform mixture with a total concentration of nickel, cobalt, and manganese ions of 1mol / L. Solution, the mixed solution, ammonia water and sodium hydroxide solution are simultaneously pumped into...

Embodiment 2

[0031] A, dissolving nickel sulfate and manganese sulfate that are 0.5: 1.5 by nickel and manganese metal ion mol ratio in deionized water, is mixed with the uniform nickel-manganese mixed solution that total concentration is 0.1mol / L. Pump the mixed solution of metal salt, 3mol / L ammonia water and 2mol / L sodium hydroxide solution into the reaction kettle at the same time, control the pH value of the reaction solution in the reaction kettle to 8.5, control the reaction temperature to 40°C, and control the reaction kettle Stir the material inside for 20h to control the particle size D of co-precipitation 50 = 9 μm. Dissolve nickel sulfate, cobalt sulfate, and manganese sulfate in deionized water with a molar ratio of nickel, cobalt, and manganese metal ions of 0.233:0.133:0.633 to form a uniform mixture with a total concentration of nickel, cobalt, and manganese ions of 1mol / L. Solution, the mixed solution, ammonia water and sodium hydroxide solution are simultaneously pumped ...

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
particle sizeaaaaaaaaaa
densityaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

A preparation method of a lithium ion battery high-voltage composite cathode material relates to the field of lithium ion battery cathode material. The method comprises steps of: preparing a precursor: reacting a prepared mixed solution of nickel salt and manganese salt with a NaOH solution and ammonia to generate spherical Ni0.5Mn1.5(OH)4; adding a prepared mixed solution of nickel salt, cobalt salt and manganese salt, a NaOH solution and ammonia into a suspension of the precursor Ni0.5Mn1.5(OH)4 for reaction; carrying out centrifugal separation, washing and drying to obtain a spherical precursor Ni0.5Mn1.5(OH)4 coated with a trace amount of NixCoyMnz (OH)2; mixing the prepared precursor with lithium salt; and carrying out high temperature heat treatment at 700-900 DEG C to prepare a high-voltage composite cathode material LiNi0.5Mn1.5O4 coated with a trace amount of Li1+a [NixCoyMnz ]O2. The invention has the following advantages: the adopted two-step method for preparation of precursor is beneficial to uniformity of the product; and the coated materials has excellent circulation stability performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a preparation method of a lithium-ion battery high-voltage composite cathode material. Background technique [0002] Due to its high energy density, high voltage, high load capacity, no memory effect, no pollution, long cycle life, and excellent safety, lithium-ion batteries have become the focus of research and development of power materials around the world. Currently used cathode materials such as LiCoO 2 , LiMnO 4 , LiNiO 2 and LiFePO 4 The voltage of the battery is lower than 4V, which limits the power of the battery. If a higher voltage is required, a plurality of batteries with the above-mentioned materials as positive electrodes must be used in series, which brings a lot of inconvenience to maintenance and use. If the voltage of the positive electrode material can be increased, the above-mentioned problems will be well solved. In recent...

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 Patents(China)
IPC IPC(8): H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 程迪赵田王明强徐云军尹正中
Owner HENAN KELONG GRP