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Method for reducing content of residual alkali on surface of high-nickel cathode material of lithium-ion battery

A technology for lithium ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of decreased cycle performance, low cost performance, increased specific surface area of ​​positive electrode materials, etc., and achieves less side reactions and simple processing technology. , The effect of improving processing performance and cycle life

Pending Publication Date: 2020-07-03
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But each method has its limitations
Optimizing the sintering process to reduce alkaline impurities generally has a limited degree of improvement, the effect is not obvious, and the cost performance is not high; reducing the feed ratio of Li and metal will result in a low reversible capacity, and the control range is limited; the washing and coating process will increase the number of cathode materials. The specific surface area increases the side reaction between the positive electrode material and the electrolyte; due to Li + / H + Ion exchange, sacrificing the electrochemical performance of the material, reduces the capacity and deteriorates the cycle, especially for high-nickel NCM / NCA with a Ni content of more than 85%, and the cost of wastewater treatment is not small
Alcohol washing and weak acid treatment, although the degree of alkali removal can be better controlled, but for high-nickel materials with a Ni content of more than 85%, the active hydrogen of alcohols will also interact with the structure of Li + Ion exchange occurs, which brings certain side reactions, such as an increase in specific surface area and a decrease in cycle performance

Method used

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  • Method for reducing content of residual alkali on surface of high-nickel cathode material of lithium-ion battery
  • Method for reducing content of residual alkali on surface of high-nickel cathode material of lithium-ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0031] In this embodiment, the residual alkali treatment process on the surface of the high-nickel ternary positive electrode material is as follows:

[0032] In 100g 1,4-dioxane (1,4-dioxane), according to the high-nickel ternary cathode material Li to be treated 1.04 (Ni 0.85 co 0.10 mn 0.04 Al 0.01 ) 0.96 o 2 Add 1-pentanoic acid to 0.5 times the molar amount of residual lithium on the surface as the molar concentration target value, stir at a speed of 2m / s to dissolve it, and form a 1,4-dioxane solution of 1-pentanoic acid;

[0033] To a solution of 1-pentanoic acid in 1,4-dioxane was added 200 g of Li 1.04 (Ni 0.85 co 0.10 mn 0.04 Al 0.01 ) 0.96 o 2The powder was continuously stirred for 1 minute, the solvent was removed by centrifugation, and then dried under vacuum conditions at 30° C., and the treated high-nickel ternary positive electrode material was obtained after drying.

[0034] Assembling the processed high-nickel ternary cathode material into a lith...

Embodiment 2

[0037] In this embodiment, the residual alkali treatment process on the surface of the high-nickel ternary positive electrode material is as follows:

[0038] In 100g N-methylpyrrolidone (NMP), according to the high-nickel ternary cathode material Li to be treated 1.01 (Ni 0.90 co 0.05 mn 0.04 W 0.01 ) 0.99 o 2 1.0 times the molar amount of residual lithium on the surface is the molar concentration target value, add 1-butyric acid, stir at a speed of 8m / s to dissolve it, and form a N-methylpyrrolidone solution of 1-butyric acid;

[0039] Add 100g Li to the N-methylpyrrolidone solution of 1-butyric acid 1.01 (Ni 0.90 co 0.05 mn 0.04 W 0.01 ) 0.99 o 2 The powder was stirred for 5 minutes, and the solvent was removed by centrifugation, and then dried under vacuum at 80° C., and the treated high-nickel ternary positive electrode material was obtained after drying.

[0040] The treated high-nickel ternary positive electrode material was assembled with reference to the ...

Embodiment 3

[0042] In this embodiment, the residual alkali treatment process on the surface of the high-nickel ternary positive electrode material is as follows:

[0043] Into 400g dimethyl sulfoxide, according to the high-nickel ternary cathode material Li to be treated 0.95 (Ni 0.95 co 0.02 mn 0.01 sc 0.02 ) 1.05 o 2 0.5 times the molar amount of residual lithium on the surface is the molar concentration target value, and methanesulfonic acid is added, and the high-nickel ternary positive electrode material to be treated is Li 0.95 (Ni 0.95 co 0.02 mn 0.01 sc 0.02 ) 1.05 o 2 Add tungstophosphoric acid to 0.6 times the molar amount of residual lithium on the surface as the molar concentration target value, stir at a speed of 7m / s to dissolve it, and form a dimethyl sulfoxide solution of methanesulfonic acid and tungstophosphoric acid;

[0044] Add 100g Li to the DMSO solution of methanesulfonic acid and tungstophosphoric acid 0.95 (Ni 0.95 co 0.02 mn 0.01 sc 0.02 ) 1.05...

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Abstract

The embodiment of the invention relates to a method for reducing the content of residual alkali on the surface of a high-nickel positive electrode material of a lithium ion battery. The method comprises the following steps: adding a certain amount of acid or a derivative of the acid into a certain amount of non-aqueous inactive hydrogen organic solvent at a stirring speed of 1m / s to 10m / s at normal temperature, and stirring until the acid or the derivative of the acid is completely dissolved, so as to obtain a washing solution for reducing residual alkali on the surface of the high-nickel positive electrode material of the lithium ion battery; wherein the mass ratio of the to-be-treated high-nickel positive electrode material to the non-aqueous non-active hydrogen organic solvent is 1:0.5-1:4; wherein the molar concentration of the acid or the derivative of the acid in the washing liquid is 0.5-1.5 times of the molar weight of the residual alkali on the surface of the to-be-treated high-nickel positive electrode material; adding a to-be-treated high-nickel positive electrode material into the washing liquid while stirring at a linear speed of 1m / s to 10m / s, and stirring for 1 to 120 minutes; and centrifuging to remove the solvent, vacuumizing, heating and drying at 20-80 DEG C to obtain the treated high-nickel positive electrode material.

Description

technical field [0001] The invention relates to the technical field of preparation methods of lithium-ion battery materials, in particular to a method for reducing the residual alkali content on the surface of high-nickel positive electrode materials of lithium-ion batteries. Background technique [0002] Lithium battery cathode materials, especially high-nickel ternary NCM / NCA materials, due to the residual alkaline compounds (such as LiOH and Li 2 CO 3 ) content is high, which seriously affects the air stability of high-nickel ternary materials and their processing properties during pulping and coating processes, and generally requires strict control of the dew point of the processing environment. At the same time, excessive residual alkaline compounds will also affect the safety and cycle performance of the battery, especially increase the side reactions at the interface between the positive electrode material and the electrolyte, causing the electrolyte to decompose and...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 任瑜许国干吕焱刘园园
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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