A znsb for a lithium-ion battery 2 o 6 Negative electrode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, which is applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve unsatisfactory cycle performance and rate performance, large volume changes of lithium-ion batteries, Poor cycle performance and other issues, to achieve the effect of improving electrochemical performance, excellent rate performance, and low cost

Active Publication Date: 2018-02-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alloying of ZnO during the lithium storage process makes the volume of the material change greatly and the structure is easily damaged, resulting in unsatisfactory cycle performance and rate performance.
Similarly, antimony oxide (Sb 2 o 3 ) has a low lithium intercalation potential and a theoretical specific capacity of up to 1103mAh g -1 However, in the application of lithium-ion batteries, there are also problems such as large volume changes and poor cycle performance.

Method used

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  • A znsb for a lithium-ion battery <sub>2</sub> o <sub>6</sub> Negative electrode material and preparation method thereof
  • A znsb for a lithium-ion battery <sub>2</sub> o <sub>6</sub> Negative electrode material and preparation method thereof
  • A znsb for a lithium-ion battery <sub>2</sub> o <sub>6</sub> Negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 10mmol zinc sulfate heptahydrate is dissolved in 100ml deionized water to form solution A, 20mmol antimony potassium tartrate is dissolved in 100ml deionized water to form solution B, after the two solutions are mixed, add 6ml of hydrazine hydrate (80wt.%), at 30 Stir magnetically for 12 hours at ℃, centrifuge after stirring, wash with deionized water and ethanol several times in sequence, and dry at 80 ℃ to obtain a white powder.

[0028] The dried white powder was calcined in the air atmosphere for 2h, the calcination temperature was 800°C, and the heating rate was 5°C / min to obtain ZnSb 2 o 6 particles.

[0029] Mix the material obtained in Example 1, conductive carbon black, and sodium alginate uniformly according to the mass ratio of 7:1.5:1.5, add a small amount of water, grind and mix thoroughly to form a uniform paste, and coat it on the copper foil substrate as a test The electrodes were vacuum-dried at 60°C to obtain pole pieces. A 2025-type half-battery wa...

Embodiment 2

[0035] Dissolve 20mmol zinc sulfate heptahydrate in a mixed solvent of 50ml deionized water + 50ml absolute alcohol to form solution A, dissolve 40mmol antimony potassium tartrate in 200ml deionized water to form solution B, mix the two solutions and add 10ml of hydration Hydrazine (80wt.%) was magnetically stirred at 30°C for 16h, centrifuged after stirring, washed with deionized water and ethanol several times in sequence, and dried at 80°C to obtain a white powder.

[0036] The dried white powder was calcined in the air atmosphere for 4 hours, the calcination temperature was 800°C, and the heating rate was 5°C / min, and ZnSb with a size of 80-90nm was obtained. 2 o 6 particles.

[0037] The ZnSb prepared in this embodiment 2 o 6 Nanoparticles were used as working electrodes, and lithium sheets were used as counter electrodes to assemble 2025-type button batteries. The reversible capacity was maintained at 500mA h / g after 120 cycles at a current density of 100mA / g.

Embodiment 3

[0039] Dissolve 20mmol zinc chloride in 100ml deionized water to form solution A, dissolve 40mmol sodium antimony tartrate in 200ml deionized water to form solution B, mix the two solutions, add 20mmol sodium borohydride, and stir magnetically at 50°C for 12h , centrifuged after stirring, washed with deionized water and ethanol several times in sequence, and dried at 80°C to obtain a white powder.

[0040] The dried white powder was calcined in the air atmosphere for 4h, the calcination temperature was 600°C, and the heating rate was 5°C / min to obtain ZnSb 2 o 6 particles.

[0041] The ZnSb prepared in this embodiment 2 o 6 Nanoparticles were made into working electrodes, and lithium sheets were used as counter electrodes to assemble 2025-type button batteries. The reversible capacity was maintained at 450mA h / g after 120 cycles at a current density of 100mA / g.

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Abstract

The invention discloses a preparation method of a ZnSb<2>O<6> anode material for a lithium-ion battery. The material is ZnSb<2>O<6> micro-nano particles in a tetragonal crystal structure; and the preparation method comprises the following steps: mixing a zinc salt solution and an antimonic salt solution through low-temperature stirring, and then adding a reducing agent for stirring; and filtering and drying mixed solution, and carrying out thermal treatment to obtain the ZnSb<2>O<6> in the micro-nano structure. The material disclosed by the invention has good processability and shows excellent lithium storage performance when applied to the lithium-ion battery; meanwhile, the preparation method has the characteristics of being simple to operate, friendly to environment, low in energy consumption and low in cost; and large-scale industrial production is easy to achieve.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a ZnSb lithium ion battery 2 o 6 Negative electrode material and preparation method thereof. Background technique [0002] As an environmentally friendly secondary power source with high energy density, lithium-ion batteries have the advantages of high energy density, long cycle life, small self-discharge, and no memory effect. has been widely used. At present, the anode materials of commercialized lithium-ion batteries are mostly graphite, and its theoretical specific capacity is 372 mAh / g. The current commercialized graphite-based anode materials are very close to the theoretical specific capacity, so there is a lot of room for further research to improve its specific capacity. limited, which limits the development of high specific capacity lithium-ion batteries. At the same time, with the development of mobile devices, they put forward higher and higher requi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525B82Y30/00C01G30/02
CPCB82Y30/00C01G30/02H01M4/5825H01M10/0525Y02E60/10
Inventor 张治安付云赖延清史晓东杨幸张凯李劼
Owner CENT SOUTH UNIV
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