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Core-shell type LaFeO3@C lithium battery anode material and preparation method thereof

A negative electrode material and lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low cycle life, high irreversible capacity, and poor rate performance

Active Publication Date: 2014-11-19
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, transition metal oxide anode materials also have the following problems: high irreversible capacity for the first time; high volume expansion rate during cycling, resulting in low cycle life; because they are semiconductor materials, their poor conductivity leads to poor rate performance.
According to the literature search, no relevant LaFeO 3 Relevant literature reports on the application of nanomaterials to the negative electrode of lithium-ion batteries have not been involved in actual industrial production.

Method used

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  • Core-shell type LaFeO3@C lithium battery anode material and preparation method thereof
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  • Core-shell type LaFeO3@C lithium battery anode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: First weigh 0.22g La(NO 3 ) 3 ·6H 2 O, 0.20g Fe(NO 3 ) 3 9H 2 O, 0.3g urea, and 1.773g glucose monohydrate were dissolved in 35ml distilled water to obtain a pale yellow mixed solution. Transfer the above mixed solution to a hydrothermal reaction kettle, seal it well, raise the temperature to 180° C., keep it for 12 hours, and the reaction ends. After natural cooling, the solid product was collected, and the tan product received after washing and drying was the carbon-coated lanthanum iron precipitate nanomaterial. The above-mentioned tan product was calcined at 600°C for 4 hours under air and nitrogen atmosphere respectively, and the reddish-brown solid obtained by calcination under air was LaFeO 3, calcined under nitrogen to get a tan product which is LaFeO 3 C composite nanomaterials.

Embodiment 2

[0028] Embodiment 2: First weigh 0.22g La(NO 3 ) 3 ·6H 2 O, 0.20g Fe(NO 3 ) 3 9H 2 O, 0.45g urea, 1.773g glucose monohydrate were dissolved in 35ml distilled water to obtain a pale yellow mixed solution. Transfer the above mixed solution to a hydrothermal reaction kettle, seal it well, raise the temperature to 180° C., keep it for 12 hours, and the reaction ends. After natural cooling, the solid product was collected, and the tan product received after washing and drying was the carbon-coated lanthanum iron precipitate nanomaterial. The above-mentioned tan product was calcined at 800°C for 3 hours under air and nitrogen atmosphere respectively, and the reddish-brown solid obtained by calcination under air was LaFeO 3 , calcined under nitrogen to get a tan product which is LaFeO 3 C composite nanomaterials.

Embodiment 3

[0029] Embodiment 3: First weigh 0.22g La(NO 3 ) 3 ·6H 2 O, 0.20g Fe(NO 3 ) 3 9H 2 O, 0.6g urea, 1.773g glucose monohydrate were dissolved in 35ml distilled water to obtain a pale yellow mixed solution. Transfer the above mixed solution to a hydrothermal reaction kettle, seal it well, raise the temperature to 200° C., keep it for 12 hours, and the reaction ends. After natural cooling, the solid product was collected, and the tan product received after washing and drying was the carbon-coated lanthanum iron precipitate nanomaterial. The above-mentioned tan product was calcined at 1000°C for 2 hours under air and nitrogen atmosphere respectively, and the reddish-brown solid obtained by calcination under air was LaFeO 3 , calcined under nitrogen to get a tan product which is LaFeO 3 C composite nanomaterials.

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Abstract

The invention discloses a core-shell type LaFeO3@C lithium battery anode material and a preparation method thereof. The hydrothermal carbonization method is adopted for synthesizing a LaFeO3@C composite nanometer material with a core-shell structure for the first time. During the hydro-thermal synthesis process, carbonates and ammonia water are decomposed from urea, OH<-> is released from urea through hydrolysis, the solution is alkali, lanthanum ions and iron ions are precipitated, lanthanum and iron sediments are gathered for nucleation, a carbohydrate is subjected to the hydrothermal carbonization at 180 DEG C to form a shell carbon layer, so that the lanthanum and iron sediment cores can completely cover the inner part of the carbon layer to form the integral core-shell structure; the structure is further subjected to the high-temperature calcination under nitrogen, so that carbon-coated lanthanum ferrite, namely the LaFeO3@C is obtained for the first time. An electrochemical test proves that the lithium storage performance of the pure LaFeO3 nano-particles is quite small, the core-shell type LaFeO3@C nano-composite has excellent lithium storage performance and has great development potential and a scientific research value, and the application of the core-shell type LaFeO3@C nano-composite in the lithium battery anode material is a great discovery.

Description

technical field [0001] The invention relates to a combination of a hydrothermal method and a high-temperature heat treatment method to obtain a core-shell type LaFeO 3 The invention discloses a method for a lithium battery negative electrode composite material, which belongs to the technical field of synthesizing new composite materials and lithium ion battery negative electrode materials by hydrothermal method and high temperature heat treatment. Background technique [0002] Lithium-ion batteries have attracted much attention because of their advantages such as high working voltage, high specific energy, low self-discharge rate, non-toxic and environmental protection, and have become the main power source of electronic products and electrical equipment. However, with the updating of electronic products in recent years and people's extensive attention to energy and power, higher requirements have been put forward for lithium-ion batteries, which need to have higher energy d...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48
CPCH01M4/366H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 牛和林武小云张胜义毛昌杰宋吉明张君友
Owner ANHUI UNIVERSITY
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