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Capsule-shaped nickel ferrite composite carbon skeleton lithium ion battery negative electrode material, and preparation method and application thereof

A lithium-ion battery, nickel ferrite technology, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve problems such as voltage hysteresis, potential safety hazards, and unstable charging and discharging platforms.

Active Publication Date: 2021-05-18
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the defects existing in the negative electrode materials of lithium-ion batteries, and overcome the problems of unstable charging and discharging platform, voltage hysteresis and a certain degree of potential safety hazards faced by lithium-ion batteries at present.

Method used

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  • Capsule-shaped nickel ferrite composite carbon skeleton lithium ion battery negative electrode material, and preparation method and application thereof
  • Capsule-shaped nickel ferrite composite carbon skeleton lithium ion battery negative electrode material, and preparation method and application thereof
  • Capsule-shaped nickel ferrite composite carbon skeleton lithium ion battery negative electrode material, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0034] This embodiment has demonstrated a kind of capsule material NiFe 2 o 4 / C synthesis method. NiFe 2 o 4 The / C anode material is synthesized by simple mixing and one-step heat treatment, including the following steps:

[0035] (1) Dissolve 180 mg ferric chloride hexahydrate, 90 mg nickel nitrate hexahydrate and 166 mg terephthalic acid in 10 mL N,N-dimethylformamide (DMF), stir for 20 min, and Add 2 mL of 0.2 M NaOH solution while stirring, then transfer to a 25 mL hydrothermal kettle, heat at 100°C for 15 h, finally wash and centrifuge with DMF and ethanol, and dry in an oven at 60°C to obtain MIL- 88(Fe 2 Ni 1 ).

[0036] (2) 0.3 g of MIL-88 (Fe 2 Ni 1 ) was mixed with 20 mL of tannic acid solution (10 mg / mL), stirred at room temperature for 1 h, washed and centrifuged several times with ultrapure water, and then dried in an oven at 60 °C, recorded as Fe 3+ / Ni 2+ - TA precursor;

[0037] (3) Take an appropriate amount of the above precursors in the ark, di...

Embodiment 2

[0047] This example shows a kind of capsule material NiFe 2 O 4 / C is a lithium-ion battery with a negative electrode.

[0048] The binder is an oily binder, the solvent is N-methylpyrrolidone (NMP), the solute is polyvinylidene fluoride (PVDF), and the configuration is 5 wt% PVDF solution.

[0049] Negative electrode material composition: active material NiFe 2 O 4 / C accounted for 70% by weight, conductive carbon black accounted for 20% by weight and binder accounted for 10% by weight.

[0050] The preparation process of the negative electrode slurry: (1) Weigh 70 mg of the sample prepared in Example 1 and about 20 mg of conductive carbon black, place them in a mortar, and grind vigorously for 15-20 min to make the particle size uniform and mix thoroughly , and then dried in an oven at 60°C; (2) Take out the dried mixed sample and weigh it. According to the ratio of 9:1, 5% PVDF was added dropwise and stirred at 700 rpm. During the stirring process, an appropriate a...

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Abstract

The invention belongs to the field of rechargeable battery materials, and particularly relates to a capsule-shaped nickel ferrite composite carbon skeleton lithium ion battery negative electrode material. The negative electrode material is NiFe2O4 / C, presents a shape similar to a capsule and has hollow and semi-structure deficiency, the synthesis method is simple, the reaction condition is mild, and the method is economical and effective. The NiFe2O4 / C negative electrode material can be directly used as a negative electrode of a lithium ion battery. The problems of unstable charging and discharging platform, voltage lagging, certain potential safety hazard and the like of the current lithium ion battery are solved. The lithium ion battery provided by the invention has excellent electrochemical properties such as stable cycle performance, stable charge-discharge voltage platform, excellent rate capability, high safety and the like.

Description

technical field [0001] The invention belongs to the field of rechargeable battery materials, and in particular relates to a capsule-shaped nickel-ferrite composite carbon skeleton lithium-ion battery negative electrode material and a preparation method and application thereof. Background technique [0002] In recent years, emerging electrochemical energy storage and conversion technologies such as rechargeable batteries, supercapacitors, fuel cells, and solar cells have received increasing attention and are considered as means to store and utilize these clean energies. In particular, rechargeable lithium-ion batteries (LIBs) have received extensive attention and development in power electronics engineering equipment due to their high operating potential, high energy density, light weight, long life, high efficiency, and environmental friendliness. However, in practical applications, LIBs still have limitations in terms of capacity, rate performance, cycle life, and safety. ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/362H01M4/523H01M4/62H01M4/625H01M4/628H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 肖高李晓慧
Owner FUZHOU UNIV
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