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Method for improving electrochemical performance of nickel-cobalt lithium manganate by chemically reducing oxidized graphene/magnesium

A technology of nickel-cobalt lithium manganese oxide and graphene, which is applied in the field of chemically reducing graphene oxide/magnesium to improve the electrochemical performance of nickel-cobalt lithium manganese oxide, can solve the problems of complex steps, many raw materials, long time, etc., and achieve low production cost, Improved performance and reduced processing costs

Active Publication Date: 2016-04-13
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the technical steps are more complicated, the raw materials are more, the time is longer, and the reaction temperature needs to be strictly controlled in the process.

Method used

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  • Method for improving electrochemical performance of nickel-cobalt lithium manganate by chemically reducing oxidized graphene/magnesium
  • Method for improving electrochemical performance of nickel-cobalt lithium manganate by chemically reducing oxidized graphene/magnesium
  • Method for improving electrochemical performance of nickel-cobalt lithium manganate by chemically reducing oxidized graphene/magnesium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment includes the following steps:

[0034] Step 1. Prepare 300 mL of a mixed aqueous solution containing 0.01 g of graphene oxide and 0.1 g of magnesium chloride.

[0035] Step 2. Add 2 g of commercially available nickel-cobalt-lithium manganese oxide powder into the above mixed aqueous solution, and stir for 8 min at a stirring speed of 500 rpm.

[0036] Step 3. Wash the nickel-cobalt lithium manganate powder after the above reaction, filter it with water, and vacuum-dry it in a vacuum drying oven with a pressure less than -0.08Mpa to obtain nickel-cobalt with magnesium ions and a chemically reduced graphene oxide layer. Lithium manganate powder.

[0037] Such as figure 1 As shown, compared with the untreated nickel-cobalt-lithium-manganese-oxide powder (a), the surface of the treated nickel-cobalt-lithium-manganese-oxide powder has an obvious chemically reduced graphene oxide layer.

[0038] Such as figure 2 with image 3 As shown, the present embodi...

Embodiment 2

[0044] This embodiment includes the following steps:

[0045] Step 1. Prepare 200 mL of a mixed aqueous solution containing 0.01 g of graphene oxide and 0.15 g of magnesium chloride.

[0046] Step 2. Add 5 g of commercially available nickel-cobalt-lithium manganese oxide powder into the above mixed aqueous solution, and stir for 15 min at a stirring speed of 450 rpm.

[0047] Step 3. Wash the nickel-cobalt lithium manganate powder after the above reaction, filter it with water, and vacuum-dry it in a vacuum drying oven with a pressure less than -0.08Mpa to obtain nickel-cobalt with magnesium ions and a chemically reduced graphene oxide layer. Lithium manganate powder.

[0048] The nickel cobalt lithium manganese oxide powder before and after treatment was made into a lithium ion battery in the same manner as in Example 1, and then the charge and discharge performance test was carried out. The test results of charge and discharge performance show that: after the nickel cobalt l...

Embodiment 3

[0050] This embodiment includes the following steps:

[0051] Step 1. Prepare 300 mL of a mixed aqueous solution containing 0.02 g of graphene oxide and 0.08 g of magnesium sulfate.

[0052] Step 2. Add 1 g of commercially available nickel-cobalt-lithium manganese oxide powder into the above mixed aqueous solution, and stir for 8 minutes at a stirring speed of 500 rpm.

[0053] Step 3. Wash the nickel-cobalt lithium manganate powder after the above reaction, filter it with water, and vacuum-dry it in a vacuum drying oven with a pressure less than -0.08Mpa to obtain nickel-cobalt with magnesium ions and a chemically reduced graphene oxide layer. Lithium manganate powder.

[0054] The nickel cobalt lithium manganese oxide powder before and after treatment was made into a lithium ion battery in the same manner as in Example 1, and then the charge and discharge performance test was carried out. The test results of charge and discharge performance show that after the nickel cobal...

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Abstract

The invention relates to a method for improving electrochemical performance of nickel-cobalt lithium manganate by chemically reducing oxidized graphene / magnesium. The method includes the steps that oxidized graphene and soluble magnesium salt are mixed and dissolved in water to form a treatment solution, nickel-cobalt lithium manganate powder is added, and a conducting composite layer of magnesium ions and the oxidized graphene reduced chemically is formed on the surface of the nickel-cobalt lithium manganate powder through one-time dispersion operation by using combination of the magnesium ions and the functional group on the oxidized graphene. Reaction conditions of the method are mild, the operation process and technology are simple, it is unnecessary to add organic solvent, a surfactant, a reducing agent and an oxidizing agent in the formation process of the composite layer, and production cost is low. Due to formation of the conducting composite layer, the rate charge-discharge performance of nickel-cobalt lithium manganate can be improved obviously.

Description

technical field [0001] The invention relates to a new material in the field of lithium batteries, in particular to a method for chemically reducing graphene oxide / magnesium to improve the electrochemical performance of nickel-cobalt lithium manganese oxide. Background technique [0002] In order to comply with the current world trend of low-carbon and environmental protection, the development and research of a new generation of green power energy is becoming more and more urgent. Lithium-ion battery, as a high-energy green battery, has been widely used due to its high capacity, high working voltage, long life, good cycle performance, low environmental pollution and high safety. Compared with the current negative electrode materials, the capacity density and power density of positive electrode materials are relatively low, which has become the main factor restricting the improvement of the overall performance of lithium-ion batteries. [0003] Nickel, cobalt, manganese terna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M4/1391H01M10/0525
CPCH01M4/1391H01M4/505H01M4/525H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 郭守武冯硕沈文卓吴海霞
Owner SHANGHAI JIAO TONG UNIV
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