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Shape-controllable high-performance lithium ion battery negative electrode material and preparation method thereof

A technology of lithium ion battery and negative electrode material, applied in battery electrodes, active material electrodes, negative electrodes, etc., can solve the problems of stability impact of lithium ion battery charging and discharging process, loss of electrical contact of active components, etc., to speed up charging and discharging rate, promotes efficient penetration, and shortens the diffusion distance

Pending Publication Date: 2021-11-19
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the lithium storage mechanism of copper oxide originates from the conversion reaction mechanism of the transition metal oxide itself to deintercalate lithium. The intercalation process is a transition from crystalline to amorphous, and there is a large degree of volume expansion during charge and discharge, thus The CuO active component is powdered, and the electrical contact between the active components is lost, which affects the stability of the lithium-ion battery charge and discharge process.

Method used

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  • Shape-controllable high-performance lithium ion battery negative electrode material and preparation method thereof
  • Shape-controllable high-performance lithium ion battery negative electrode material and preparation method thereof
  • Shape-controllable high-performance lithium ion battery negative electrode material and preparation method thereof

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Effect test

Embodiment 1

[0034] The preparation method of the lithium ion battery negative electrode material of the present embodiment comprises the following steps:

[0035] Step 1: Add 1.3g of copper nitrate trihydrate and 0.8g of urea to 280mL of distilled water under low-speed stirring, dissolve 0.13g of PVP in 6.5mL of distilled water, and mix the two solutions.

[0036] Step 2: The above mixed solution is fully stirred by a magnetic stirrer for 60 minutes to fully dissolve it, and then the above solution is transferred to a polytetrafluoroethylene hydrothermal synthesis kettle, and after screwing and closing, the temperature is kept in an electric oven. Reaction at ℃ for 16h.

[0037] Step 3: After reaching the reaction time, the hydrothermal synthesis kettle is naturally cooled to room temperature together with the electric oven. After the reaction, the solid-liquid mixture was repeatedly centrifuged at 7000 rpm for 20 minutes, and washed repeatedly with distilled water and ethanol to obtain ...

Embodiment 2

[0041] The preparation method of the lithium ion battery negative electrode material of the present embodiment comprises the following steps:

[0042] Step 1: Add 1.2 g of copper nitrate trihydrate and 0.6 g of urea to 280 mL of distilled water under low-speed stirring, dissolve 0.12 g of PVP in 6 mL of distilled water, and mix the two solutions.

[0043] Step 2: The above mixed solution is fully stirred by a magnetic stirrer for 60 minutes to fully dissolve it, and then the above solution is transferred to a polytetrafluoroethylene hydrothermal synthesis kettle, and the temperature is kept in an electric heating oven after screwing it tightly closed. Reaction at ℃ for 14h.

[0044] Step 3: After reaching the reaction time, the hydrothermal synthesis kettle is naturally cooled to room temperature together with the electric oven. After the reaction, the solid-liquid mixture was repeatedly centrifuged at 7000 rpm for 30 minutes, and washed repeatedly with distilled water and et...

Embodiment 3

[0050] The preparation method of the lithium ion battery negative electrode material of the present embodiment comprises the following steps:

[0051] Step 1: Add 1.4g of copper nitrate trihydrate and 0.9g of urea to 300mL of distilled water under low-speed stirring, dissolve 0.14g of PVP in 7mL of distilled water, and mix the two solutions.

[0052] Step 2: The above mixed solution is fully stirred by a magnetic stirrer for 90 minutes to fully dissolve it, and then the above solution is transferred to a polytetrafluoroethylene hydrothermal synthesis kettle, and the temperature is kept in an electric heating oven after screwing it tightly closed. Reaction at ℃ for 14h.

[0053] Step 3: After reaching the reaction time, the hydrothermal synthesis kettle is naturally cooled to room temperature together with the electric oven. After the reaction, the solid-liquid mixture was repeatedly centrifuged at 6000 rpm for 30 minutes, and washed repeatedly with distilled water and ethanol...

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Abstract

The invention discloses a shape-controllable high-performance lithium ion battery negative electrode material and a preparation method thereof. The negative electrode material is formed by compounding copper oxide and graphene. Copper nitrate trihydrate is adopted as a precursor, polyvinylpyrrolidone is adopted as a shape protective agent, urea is added as an alkali source, and thermal and kinetic factors of reaction are controlled under a sealed solvothermal condition in a dynamic nucleation crystallization manner, so that the copper oxide microspheres with different shapes are obtained. Graphene is used as a substrate, and the copper oxide / graphene composite material is finally obtained through standing treatment and used for testing various physical properties and testing electrochemical electrodes, battery performance and the like. The lithium ion battery negative electrode material with high stability can be obtained through simple operation steps and mild reaction conditions, copper oxide with different shapes can be prepared under the control of solvothermal conditions, and the charging and discharging efficiency of a negative electrode and the cycle performance can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode material preparation, and in particular relates to a transition metal oxide / graphene morphology-controllable lithium-ion battery negative electrode material and a preparation method thereof. Background technique [0002] In order to meet the increasing energy demands of human beings, especially the booming electric vehicle market in recent years, it is crucial to develop a new generation of lithium-ion batteries (LIBs) with excellent performance. At present, commercial lithium-ion batteries mainly use artificial graphite and other carbon materials as negative electrodes, but due to their low theoretical capacity (372mAh / g), the limitations of traditional electrode materials in terms of specific capacity, cycle life and safety have become increasingly prominent, restricting Further development of lithium-ion batteries. [0003] In recent years, transition metal oxide material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62H01M10/0525C01B32/194C01G3/02
CPCH01M4/483H01M4/625H01M4/628H01M10/0525C01G3/02C01B32/194C01B2204/22C01P2004/03C01P2006/40H01M2004/021H01M2004/027Y02E60/10
Inventor 刘薇姚建涛张贵泉陈君陈甜甜
Owner XIAN THERMAL POWER RES INST CO LTD
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