Method for improving residual alkalinity on surface of ternary positive electrode material of lithium ion battery

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, electrical components, secondary batteries, etc., can solve problems such as capacity reduction, and achieve the effects of reducing residual alkali content, simple process flow, and improving interface performance.

Inactive Publication Date: 2018-11-23
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on the technical problems existing in the background technology, the present invention proposes a method for improving the residual alkalinity on the surface of the ternary positive electrode material of a lithium ion battery. The final sintering supplements the lithium lost in the washing process, and solves the problem of capacity reduction after washing, and prepares lithium-ion battery cathode materials with low alkali content on the surface. The process is simple and easy to realize industrial production.

Method used

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  • Method for improving residual alkalinity on surface of ternary positive electrode material of lithium ion battery

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Embodiment 1

[0020] A method for improving the residual alkalinity on the surface of a lithium-ion battery ternary positive electrode material, comprising the following steps:

[0021] S1, the molecular formula of 80g is LiNi 0.8 co 0.1 mn 0.1 o 2 The powdered nickel-cobalt-manganese layered positive electrode material is mixed with 400 g of water at a temperature of 80 ° C, and centrifuged to obtain the washed powder material;

[0022] S2. Add 0.0004g of lithium nitrate to 16g of absolute ethanol and mix evenly, then add water to wash the powder material, mix evenly, heat and evaporate completely, dry at 80°C, and sinter at 800°C for 1h to obtain a lithium-ion battery ternary positive electrode material, sinter The atmosphere is pure oxygen.

Embodiment 2

[0024] A method for improving the residual alkalinity on the surface of a lithium-ion battery ternary positive electrode material, comprising the following steps:

[0025] S1, the molecular formula of 40g is LiNi 0.7 co 0.15 mn 0.15 o 2 The powdered nickel-cobalt-manganese layered positive electrode material is mixed with 40 g of water at a temperature of 60 ° C, and centrifuged to obtain the washed powder material;

[0026] S2. Add 0.0004g of lithium nitrate to 40g of absolute ethanol and mix evenly, then add water to wash the powder material, mix evenly, rotate evaporate completely, dry at 120°C, and sinter at 100°C for 3h to obtain a lithium-ion battery ternary positive electrode material, and sinter The atmosphere is pure oxygen.

Embodiment 3

[0028] A method for improving the residual alkalinity on the surface of a lithium-ion battery ternary positive electrode material, comprising the following steps:

[0029] S1, the molecular formula of 50g is LiNi 0.9 co 0.05 mn 0.05 o 2 The powdered nickel-cobalt-manganese layered positive electrode material is mixed with 100 g of water at a temperature of 10 ° C, and centrifuged to obtain the washed powder material;

[0030] S2. Add 0.001g of lithium nitrate to 50g of absolute ethanol and mix evenly, then add water to wash the powder material, mix evenly, rotary evaporate completely, dry at 60°C, sinter at 700°C, and sinter for 2 hours to obtain a lithium-ion battery ternary Cathode material, the sintering atmosphere is pure oxygen.

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Abstract

The main idea for solving the problem of excessively high residual alkalinity on a surface of a ternary material is in a way that the residual alkalinity on the surface of the material can be reducedby washing. Although the residual alkalinity on the surface of the high-nickel ternary material can be reduced after washing, and the lithium content after washing is reduced to cause that the specific capacity also can be reduced and the battery performance is affected. The invention discloses a method for improving residual alkalinity on a surface of a ternary positive electrode material of a lithium ion battery. The method comprises the following steps of mixing powdered Ni-Co-Mn layered positive electrode material with molecular formula being LiNi<x>Co<y>Mn<z>O<2> and water, and performingcentrifugal separation to obtain a washed powder material; adding a lithium source to absolute ethyl alcohol for uniformly mixing, adding the washed powder material for uniformly mixing, and performing complete evaporation, drying and sintering to obtain the ternary positive electrode material of the lithium ion battery. After washing, lithium supplement and secondary sintering are performed on the ternary material by an ethyl alcohol system, the lithium which is lost during washing is supplemented, and the performance of the material is improved; and moreover, the process flow is simple, andindustrial production is convenient to implement.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for improving the residual alkalinity on the surface of a ternary positive electrode material of a lithium ion battery. Background technique [0002] With the rapid development of the new energy market, people have put forward higher requirements for the energy density of lithium-ion power batteries. The ternary layered material LiNi x co y mn z o 2 The specific capacity of the material is improved by introducing nickel, and the introduction of cobalt reduces the degree of cation lithium-nickel mixing and improves the electronic conductivity of the material, improving the cycle performance and rate performance of the ternary layered material. It does not participate in chemical reactions during the process, and can be used as the skeleton structure of ternary layered materials to improve its lattice stability and prevent the collapse of the material stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/1391H01M10/0525
CPCH01M4/1391H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王兆干陈龙沈中宇张蒙李道聪夏昕
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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