Positive electrode material and preparation method thereof

A positive electrode material, lithium manganese chromium technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problem of no obvious improvement in the rate performance of layered oxide positive electrode materials, to reduce production costs, save energy, and sintering temperature low effect

Inactive Publication Date: 2017-06-16
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, because the preparation of layered oxide cathode materials is usually carried out in a high-temperature oxygen-containing atmosph

Method used

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  • Positive electrode material and preparation method thereof
  • Positive electrode material and preparation method thereof
  • Positive electrode material and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0027] Example 1

[0028] Li 1.2 Mn 0.6 Cr 0.2 O z / graphene cathode material, namely x=0.62, y=0.08, wherein the mass ratio of lithium manganese chromium oxide and graphene is 100:1.

[0029] Using lithium carbonate, manganese acetate, chromium acetate and graphene oxide as starting materials, 1.471g manganese acetate and 0.458g chromium acetate were dissolved in 30mL H 2 Mixed solution of O and 20 mL of absolute ethanol; ultrasonically dispersed graphene oxide into it; dissolve 0.466 g of lithium carbonate in 100 mL of H 2 Evaporate the obtained solution to dryness at 140 °C and then dry it at 200 °C for 10 h; put the dried precursor into the crucible, and heat it up to 1 °C / min in a box furnace Heating at 400°C for 3h; finally transferred to a tube furnace and heat-treated at 700°C for 12h under the protection of Ar, and Li can be obtained after cooling with the furnace 1.2 Mn 0.6 Cr 0.2 O z / Graphene cathode material.

[0030] The above Li 1.2 Mn 0.6 Cr 0.2 O...

Example Embodiment

[0031] Example 2

[0032] Li 1.2 Mn 0.5 Cr 0.3 O z / Graphene cathode material, namely x=0.53, y=0.02, wherein the mass ratio of lithium manganese chromium oxide and graphene is 100:1.

[0033] Using lithium carbonate, manganese acetate, chromium acetate and graphene oxide as starting materials, 1.226g manganese acetate and 0.687g chromium acetate were dissolved in 30mL H 2 Mixed solution of O and 20 mL of absolute ethanol; ultrasonically dispersed graphene oxide into it; dissolve 0.466 g of lithium carbonate in 100 mL of H 2Evaporate the obtained solution to dryness at 140 °C and then dry it at 200 °C for 10 h; put the dried precursor into the crucible, and heat it up to 1 °C / min in a box furnace Heating at 400°C for 3h; finally transferred to a tube furnace and heat-treated at 700°C for 12h under the protection of Ar, and Li can be obtained after cooling with the furnace 1.2 Mn 0.5 Cr 0.3 O z / Graphene cathode material. The XRD test results of the material show tha...

Example Embodiment

[0034] Example 3: Li 1.3 Mn 0.5 Cr 0.2 O z / Graphene cathode material, namely x=0.872, y=0.008, wherein the mass ratio of lithium manganese chromium oxide and graphene is 100:1.

[0035] Using lithium carbonate, manganese acetate, chromium acetate and graphene oxide as starting materials, 1.226g manganese acetate and 0.458g chromium acetate were dissolved in 30mL H 2 Mixed solution of O and 20 mL of absolute ethanol; ultrasonically dispersed graphene oxide into it; dissolve 0.504 g of lithium carbonate in 100 mL of H 2 Evaporate the obtained solution to dryness at 140 °C and then dry it at 200 °C for 10 h; put the dried precursor into the crucible, and heat it up to 1 °C / min in a box furnace Heating at 400°C for 3h; finally transferred to a tube furnace and heat-treated at 700°C for 12h under the protection of Ar, and Li can be obtained after cooling with the furnace 1.3 Mn 0.5 Cr 0.2 O z / Graphene cathode material. The XRD test results of the material show that the ...

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Abstract

The invention relates to a positive electrode material and a preparation method thereof. The morphology of the positive electrode material prepared through the method is a self-assembled ball. The method concretely comprises the following steps: 1, dissolving a manganese salt, a chromium salt and graphene oxide in water or a water and ethanol mixed solution; 2, dissolving a lithium salt in water, and pouring the solution obtained in step 1; 3, evaporating the solution obtained in step 2 at a proper temperature until the solution is dry; and 4, carrying out heat treatment on a precursor obtained in step 3 in air at a low temperature for a period of time, and carrying out high-temperature heat treatment under the protection of an inert gas to obtain the positive electrode material. The preparation method is characterized by in-situ compounding of spinel, a layered positive electrode material and graphene, so the positive electrode material obtained in the invention has the characteristics of very excellent rate performances, high specific capacity and long cycle life.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a positive electrode material and a preparation method thereof. Background technique [0002] With the popularity of electric vehicles and portable electronic devices, lithium-ion batteries with high power density, high energy density, long cycle life, high volume specific capacity and high safety have become the ultimate goal of current research. NCA and MCN are currently commonly used positive electrode materials for lithium batteries, but both of these two positive electrode materials contain cobalt elements, resulting in high production costs for the entire material. At the same time, the performance of all aspects of lithium-ion batteries depends to a large extent on the performance of the cathode material, so there is an urgent need to further improve the capacity performance, rate performance and cycle stability of the cathode material. So far, among the common positi...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/62
CPCH01M4/485H01M4/505H01M4/625Y02E60/10
Inventor 杨立罗冬房少华
Owner SHANGHAI JIAO TONG UNIV
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