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Mixed transition metal borate negative electrode material and preparation method thereof

A technology of transition metal and negative electrode material, applied in the field of mixed transition metal borate negative electrode material and its preparation, can solve the problems of high redox potential of lithium metal, low energy density of negative electrode, internal short circuit, etc. Chemical activity, avoiding the slow reaction rate of the product, and avoiding the effect of lithium precipitation in the negative electrode

Active Publication Date: 2018-05-11
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Carbon materials such as hard carbon graphite are a common type of anode materials for lithium-ion batteries, but their theoretical and actual specific capacity is low (~300 mAh / g), and their compaction density is small, resulting in low overall energy density of the anode.
In addition, the lithium intercalation voltage of graphite-based anode materials is very low (<0.1V), and it is prone to lithium precipitation to form dendrites, which may pierce the separator and cause internal short circuit; at the same time, its solid-electrolyte interface film (SEI) has poor thermal stability. , when the battery overheats, it will further decompose and generate heat
Although the transition metal oxide-type negative electrode material has a high specific capacity, its redox potential to lithium metal is high (>1V), which greatly reduces the output voltage of the full battery.

Method used

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  • Mixed transition metal borate negative electrode material and preparation method thereof
  • Mixed transition metal borate negative electrode material and preparation method thereof
  • Mixed transition metal borate negative electrode material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0038] A kind of mixed transition metal borate FeVBO of the present embodiment 4 The preparation method of the negative electrode material, the specific preparation steps are as follows:

[0039] (1) Liquid phase mixing: mix 4.986g iron sulfate (FeSO 4 ) and 2.985g vanadium pentoxide (V 2 o 5 ) into 200mL deionized water, heated to 40°C and stirred for 20 min to dissolve, then added 2.029g boric acid (H 3 BO 3 ) stirred for 30 min to dissolve, and finally added 3.153g citric acid (C 6 h 8 o 7 ) as a chelating agent, heated to 70°C and continuously stirred, evaporated excess water to form a sol;

[0040] (2) Aging process: heat and age the sol obtained in step (1) in an oven at 80°C for 24 hours to obtain a dry gel-like precursor mixture;

[0041] (3) Pre-fired curing: The precursor mixture in step (2) was fired at 500°C for 10 hours in an air atmosphere to form a fully cured carbon-free intermediate reaction product;

[0042] (4) Sintering reaction: Grind the interme...

Embodiment 2

[0044] Example 2 A mixed transition metal borate FeVBO of this example 4 The preparation method of the negative electrode material, the specific preparation steps are as follows:

[0045] (1) Liquid phase mixing: 5.975 g ferric citrate and 2.854 g ammonium metavanadate (NH 4 VO 3 ) into 300mL of deionized water, heated to 50°C and stirred for 50 min to dissolve, then added 1.171 g of ammonium pentaborate (NH 4 B 5 o 8 ) stirred for 20 min to dissolve, and finally added 4.395 g glucose (C 6 h 12 o 6 ) as a chelating agent, heated to 80°C and continuously stirred to evaporate excess water to form a sol;

[0046] (2) Aging process: heat and age the sol obtained in step (1) in an oven at 100°C for 12 h to obtain a dry gel-like precursor mixture;

[0047] (3) Pre-fired curing: the precursor mixture in step (2) was fired at 600°C for 2 hours in an air atmosphere to form a fully cured carbon-free intermediate reaction product;

[0048] (4) Sintering reaction: Grind the inte...

Embodiment 3

[0051] A kind of carbon composite material FeVBO of mixed transition metal borate of the present embodiment 4 The preparation method of / C negative electrode material, concrete preparation steps are as follows:

[0052] (1) Liquid phase mixing: 2.626g ferrous oxalate (FeC 2 o 4 ) and 6.357g vanadium acetylacetonate (C 15 h 21 o 6 V), added to 250ml of deionized water, heated to 60°C and stirred for 120 minutes to dissolve, then added 1.017g of boron oxide (B 2 o 3 ), stirred for 10 minutes to dissolve, and finally added 6.577g of sucrose as a carbon source and chelating agent, heated to 90°C and continued to stir, evaporated excess water and finally formed a sol;

[0053] (2) Aging process: heat and age the sol obtained in step (1) in an oven at 90°C for 36 h to obtain a dry gel-like precursor mixture;

[0054] (3) Pre-fired curing: the precursor mixture in step (2) was heated in N 2 -H 2 Mixed gas atmosphere (95% N 2 + 5%H 2 ) at 400°C for 6 h to form a fully soli...

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Abstract

The invention discloses a mixed transition metal borate negative electrode material and a preparation method thereof. Mixed transition metal borate comprises two transition metal elements, namely ironand vanadium, and has a chemical formula of FeVBO4 or FeVBO4 / C, wherein the FeVBO4 belongs to a monoclinal system; and cell parameters are as follows: a is equal to 9.4-9.9angstrom, b is equal to 3.0-3.5angstrom, c is 9.1-9.6angstrom, beta is equal to 90-93 degrees and Z is equal to 4. The preparation method comprises the following steps of taking a vanadium salt or vanadium oxide, an iron salt or iron oxide, boric acid or boron oxide or borate and citric acid or glucose or other organic carbon materials as raw materials; mixing by using a sol-gel method; carrying out presintering and curing;and finally sintering to obtain the mixed transition metal borate negative electrode material. The mixed transition metal borate is used as a negative electrode material for a lithium-ion battery, the discharge voltage plateau to lithium is about 0.6V (vs. Li), formation of lithium dendrites can be effectively avoided and the safety performance of the lithium-ion battery is improved.

Description

technical field [0001] The invention belongs to the field of lithium ion battery electrode materials, and in particular relates to a mixed transition metal borate negative electrode material and a preparation method thereof. Background technique [0002] With the development of smart mobile devices, electric vehicles, and clean energy, the demand for advanced energy storage batteries with high specific energy, good safety, and long cycle life is becoming increasingly urgent. Although new battery systems such as lithium-air batteries, lithium-sulfur batteries, aluminum-ion batteries, and magnesium-ion batteries have made great progress in the experimental stage, commercialization still faces many insurmountable problems. Today, lithium-ion batteries are still the mainstream product and the best choice in the energy storage battery market, and have been successfully and widely applied to various portable electronic products (such as smartphones, tablet computers, notebook comp...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 邝泉董茂林赵彦明
Owner SOUTH CHINA UNIV OF TECH
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