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Method for preparing cathode material LiCo<x>Ni<y>Mn<z>O<2> of lithium ion battery using carbon dioxide as catalyst

A lithium-ion battery and carbon dioxide technology, applied in the direction of physical/chemical process catalysts, battery electrodes, chemical instruments and methods, etc., can solve the problems of poor crystallinity of positive electrode materials, fewer charge and discharge cycles, and low alkalinity of carbonate solutions, etc. problem, to achieve the effect of increasing the concentration, reducing the amount of residual ions, and high crystallinity

Inactive Publication Date: 2012-04-25
HARBIN NORMAL UNIVERSITY
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problem that the low alkalinity of the carbonate solution in the existing method leads to the poor crystallinity of the positive electrode material, the low discharge capacity of the positive electrode, and the small number of charge and discharge cycles. Catalyst preparation of lithium-ion battery cathode material LiCo x Ni y mn z o 2 Methods

Method used

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  • Method for preparing cathode material LiCo&lt;x&gt;Ni&lt;y&gt;Mn&lt;z&gt;O&lt;2&gt; of lithium ion battery using carbon dioxide as catalyst
  • Method for preparing cathode material LiCo&lt;x&gt;Ni&lt;y&gt;Mn&lt;z&gt;O&lt;2&gt; of lithium ion battery using carbon dioxide as catalyst
  • Method for preparing cathode material LiCo&lt;x&gt;Ni&lt;y&gt;Mn&lt;z&gt;O&lt;2&gt; of lithium ion battery using carbon dioxide as catalyst

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specific Embodiment approach 1

[0010] Specific implementation mode 1: In this implementation mode, carbon dioxide is used as a catalyst to prepare lithium-ion battery cathode material LiCo x Ni y mn z o 2 The method is as follows: 1. According to the chemical formula LiCo x Ni y mn z o 2 , respectively weigh cobalt salt, nickel salt and manganese salt according to the molar ratio of Co element, Ni element and Mn element as x:y:z, and then dissolve them in distilled water to obtain system 1, where 0≤x, 0≤y , z≤1, x, y, z are not 0 simultaneously; Two, sodium carbonate and ammoniacal liquor are dissolved in distilled water, obtain system 2, wherein the amount of cobalt ion, nickel ion and manganese ion total substance in system 1 and sodium carbonate The molar ratio of substances is (x+y+z): 1; 3. Add system 1 and system 2 to distilled water under the conditions of carbon dioxide atmosphere, water temperature of 30°C-60°C, and pH value of 8-9, and then Stir for 12 hours under the condition of stirring ...

specific Embodiment approach 2

[0012] Embodiment 2: This embodiment differs from Embodiment 1 in that the cobalt salt described in step 1 is cobalt sulfate, cobalt acetate or cobalt nitrate. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0013] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the cobalt salt described in step 1 is a combination of any two of cobalt sulfate, cobalt acetate and cobalt nitrate. Others are the same as in the first embodiment.

[0014] In the cobalt salt described in this embodiment, the two components are mixed in any ratio.

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Abstract

The present invention provides a method for preparing cathode material LiCo*Ni*Mn*O* of lithium ion battery using carbon dioxide as catalyst, and relates to a method for preparing cathode material of lithium ion battery. The method of the invention settles the problems of inferior crystallinity degree and few cycle numbers of charging / discharging caused by inferior alkaline of carbonate solution in prior method. The method of the invention comprises the following steps: 1. dissolving cobalt slat, nickel salt and manganese salt in distilled water for obtaining a system 1; 2. dissolving sodium carbonate and ammonia water in distilled water for obtaining a system 2; 3. adding the system 1 and system 2 into the distilled water, filtering, drying the filter residue and obtaining the precursor powder; and 4. after mixing a lithium source with the precursor powder, sintering and obtaining the cathode material of lithium ion battery. The cathode material of lithium ion battery, which is prepared according to the invention, has the advantages of high crystallinity degree and high discharge capacity. Furthermore the capacity retention rate of cathode material of lithium ion battery, which is prepared according to the invention, obtains 98.6% after cycling for 30 times.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] There are many systems of cathode materials for lithium-ion batteries currently developed, among which the layered lithium transition metal oxide system (LiCo x Ni y mn z o 2 , 0≤x, y, z≤1) has the advantages of stable performance and high safety. Co-precipitation method is an important method for preparing lithium transition metal oxide series electrode materials. In co-precipitation method, carbonate is used as precipitant Also known as carbonate co-precipitation method. Since the carbonate radical can form a stable divalent carbonate with the transition metal, further oxidation of the transition metal is avoided. However, due to the low alkalinity of the carbonate solution, the pH value of the solution is low during the reaction process, and some ions are not completely precipitated during the reaction process, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/48H01M4/50H01M4/52C01G53/04B01J27/20
CPCY02E60/12Y02E60/10
Inventor 邓超王宇赵儒衿田英
Owner HARBIN NORMAL UNIVERSITY
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