Surface modification technology of cathode material for lithium ion battery

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor consistency, increased material surface area, and reduced capacity

Active Publication Date: 2014-08-06
QINGDAO LNCM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of inorganic oxides or phosphates to coat and modify the positive electrode material will improve its cycle performance and safety performance, due to the high temperature heat treatment, the metal oxide or phosphate grain

Method used

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  • Surface modification technology of cathode material for lithium ion battery
  • Surface modification technology of cathode material for lithium ion battery
  • Surface modification technology of cathode material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A surface modification technology for lithium-ion battery cathode materials, completed by the following steps:

[0029] (1) adding nickel cobalt lithium manganese oxide and its doped modified derivatives into diethyl carbonate according to the weight ratio of 1:4 and stirring for 30min;

[0030] (2) filtering the solid-liquid mixture until obtaining a solid filter cake with an organic solvent content of 10%;

[0031] (3) The filter cake was heat-treated at 500° C. for 4 hours to obtain the desired product.

Embodiment 2

[0033] A surface modification technology for lithium-ion battery cathode materials, completed by the following steps:

[0034] (1) Nickel cobalt lithium manganese oxide was added into the mixture of ethyl methyl carbonate and dimethyl carbonate according to the weight ratio of 1:5 and stirred for 70min;

[0035] (2) filtering the solid-liquid mixture until obtaining a solid filter cake with an organic solvent content of 8.5%;

[0036] (3) The filter cake was heat-treated at 650° C. for 4.5 hours to obtain the desired product.

Embodiment 3

[0038] A surface modification technology for lithium-ion battery cathode materials, completed by the following steps:

[0039] (1) Lithium cobaltate is added to the mixture of ethylene carbonate and dimethyl carbonate according to the weight ratio of 1:2 and stirred for 60min;

[0040] (2) filtering the solid-liquid mixture until obtaining a solid filter cake with an organic solvent content of 15%;

[0041] (3) The filter cake is heat-treated at 100° C. for 5 hours to obtain the desired product.

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PUM

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Abstract

The invention belongs to the field of inorganic nonmetallic materials and relates to a surface modification technology of a cathode material for a lithium ion battery. The surface modification technology comprises the following steps: the cathode material for the lithium ion battery, mainly including ternary materials of lithium cobalt oxide, lithium manganese oxide, lithium nickel-cobalt-manganese oxide, nickel and cobalt aluminate, layered rich lithium high manganese and other solid solution materials, is sintered at a high temperature, and put into an organic solvent to be fully stirred; then a solid-liquid mixture is filtered; a filter cake is heated to obtain a final product. The surface modification technology of the anode material for the lithium ion battery has the benefits that through the cathode material for the lithium ion battery modified by the surface modification technology, the pH value and the impurity lithium content of the material can be effectively reduced, and the high temperature cycle and the storage performance of the material can be improved, so that the material has excellent cycle performance and high-temperature performance; the surface modification technology can be widely used in the cathode material for the lithium ion battery and particularly is applied to a power type lithium ion battery.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to a surface modification technology of lithium-ion battery cathode materials. Background technique [0002] In the early 1980s, American scholar J.B.Goodenough and others first discovered lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ) and lithium manganate (LiMn 2 o 4 ) can be used as a material for deintercalating lithium ions, and related patents have been applied for. Among them, lithium cobaltate was successfully used in the first commercialized lithium-ion battery for small electronic products as a positive electrode material by Sony Corporation of Japan in the early 1990s due to its excellent electrochemical performance and good electrode processing performance. Although lithium nickelate has a high reversible specific capacity (210mAh / g), it cannot be applied in practical lithium-ion batteries due to its poor structural and thermal stability a...

Claims

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Application Information

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IPC IPC(8): H01M4/48
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 孙玉城
Owner QINGDAO LNCM
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