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Method of lithium ion secondary battery anode active compound coating oxide layer

A positive electrode active material and secondary battery technology, applied in chemical instruments and methods, electrode manufacturing, chemical/physical/physicochemical processes, etc., can solve the problems of high energy consumption, large pollution, low energy consumption, etc., and achieve energy consumption Low, little pollution, good safety effect

Active Publication Date: 2008-02-06
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of high energy consumption and large pollution in the method of coating the oxide layer with the positive active material of the lithium ion secondary battery in the prior art, and provide a method for coating the oxide layer with the positive active material of the lithium ion secondary battery method, low energy consumption and little pollution

Method used

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  • Method of lithium ion secondary battery anode active compound coating oxide layer
  • Method of lithium ion secondary battery anode active compound coating oxide layer
  • Method of lithium ion secondary battery anode active compound coating oxide layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This example illustrates the method for coating the oxide layer with the positive electrode active material of the lithium ion secondary battery provided by the present invention.

[0026] Follow the steps below to coat the oxide layer on the positive electrode active material:

[0027](1) Use deionized water as a solvent to prepare a 0.05 mol / liter sodium metaaluminate solution, add 10% by weight of absolute ethanol as a dispersant to the obtained solution, and stir and mix evenly.

[0028] (2) The molar ratio of all aluminum elements in the sodium metaaluminate solution described in (1) and the lithium element in the lithium cobalt oxygen is that the ratio of 1: 100 weighs the lithium cobalt oxygen particle that diameter is 5.5-19 micron, stirs Added to the solution obtained in (1) under certain conditions to obtain a uniform suspension.

[0029] (3) in the suspension that 500 milliliters (2) obtains, pass into carbon dioxide gas, the flow rate of carbon dioxide gas ...

Embodiment 2

[0034] This example illustrates the method for coating the oxide layer with the positive electrode active material of the lithium ion secondary battery provided by the present invention.

[0035] Follow the steps below to coat the oxide layer on the positive electrode active material:

[0036] (1) Use deionized water as a solvent to prepare a 0.03 mol / liter sodium silicate solution, add 5% by weight propanol to the obtained solution as a dispersant, and stir and mix evenly.

[0037] (2) According to (1) described in the sodium silicate solution, the ratio of the molar ratio of all the silicon elements in the sodium silicate solution to the lithium element in the lithium cobalt oxygen is 2: 100. Weigh the lithium cobalt oxygen particles with a diameter of 6.5-18 microns. Add it to the solution obtained in (1) to obtain a uniform suspension.

[0038] (3) Add 0.1 mol / liter of acetic acid dropwise to the suspension obtained in 500 milliliters of (2), stir while adding dropwise, a...

Embodiment 3-8

[0042] Examples 3-8 were prepared according to the method of Example 1, and the differences are shown in Table 1.

[0043] Table 1

[0044] Example

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Abstract

The present invention relates to a method for covering oxygen oxide layer on active matter of positive pole of lithium ion secondary battery. Wherein, the method comprises the steps as follows: adding acid matters in the mixture of oxysalt aqueous solution of amphoteric element and positive active matters; adjusting the PH value of the mixture making the oxygenic acid radical falling down; separating, washing, drying and calcining the gained solid product. Compared with the prior art, the invention does not need the process of evaporating a plurality of menstruum so as to reduce energy consumption and lower cost, cause slight pollution and assure safety. The battery produced by the present invention has favorable circle performance and overcharge durability.

Description

technical field [0001] The invention relates to a method for coating an oxide layer with a positive active material, in particular to a method for coating an oxide layer with a positive active material for a lithium ion secondary battery. Background technique [0002] Lithium-ion secondary batteries have the advantages of high specific energy, high operating voltage, wide operating temperature range, low self-discharge rate, no memory, long cycle life, low pollution, light weight, and good safety performance, so they have a wide range of applications. [0003] However, at present, the effective utilization rate of lithium in the positive electrode active material of lithium-ion secondary batteries is not high, such as LiCoO 2 The effective utilization rate of lithium in medium is only 50-60%. The higher the deintercalation amount of lithium, the higher the effective utilization rate of the positive electrode active material. Since the deintercalation amount of lithium in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04B22F1/02B01J19/00
CPCY02E60/12Y02E60/10
Inventor 肖峰曹文玉
Owner BYD CO LTD
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