Method for synthesizing negative electrode material Fe2SSe of lithium-ion battery by one-pot solid-phase method

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve problems such as complex synthesis processes, and achieve the effects of high product purity, short synthesis cycle, and simple operation steps

Inactive Publication Date: 2016-09-14
YANGZHOU UNIV
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Problems solved by technology

Generally, the precursors FeS and FeSe are synthesized first, and then the two are mixed evenly according to the molar ratio of 1:1, and Fe is obtained by heat treatment. 2 SSe, but the disadvantage of this is that the synthesis process is more complicated

Method used

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  • Method for synthesizing negative electrode material Fe2SSe of lithium-ion battery by one-pot solid-phase method
  • Method for synthesizing negative electrode material Fe2SSe of lithium-ion battery by one-pot solid-phase method
  • Method for synthesizing negative electrode material Fe2SSe of lithium-ion battery by one-pot solid-phase method

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Embodiment 1

[0018] One-pot solid-phase method Fe as an anode material for lithium-ion batteries 2 In the method of Sse, the Fe, Se and S elements with a total mass of 500 mg (the molar ratio of Fe, Se and S are 2:1:1) were weighed and mixed in an agate mortar and ground evenly. Use a tablet press to press the reaction raw materials into tablets, and vacuum-seal the tablets in a quartz tube with an oxyhydrogen flame and a vacuum system, then put the quartz tube into a muffle furnace to heat the reaction, and slowly heat up to 400°C within 10 hours , the heating rate is 40°C / hour, and the temperature is kept for 10 hours; after 10 hours, the temperature is slowly raised to 950°C, the heating rate is 95°C / hour, and the temperature is kept for 30 hours; the muffle furnace is turned off and the temperature is naturally cooled to room temperature to obtain the target product Fe 2 SSe. After the reaction is finished, open the quartz tube to take out the product, grind it for future use.

[001...

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Abstract

The invention discloses a method for synthesizing a negative electrode material Fe2SSe of a lithium-ion battery by a one-pot solid-phase method. A heat treatment procedure is mild; the standing time at 400 DEG C is relatively long; and a reaction failure or a great loss of a sulfur element caused by the phenomenon that raw material sublimed sulphur is easily sublimed at a high temperature to cause a quartz tube rupture is avoided. The operation steps are simple; the cost is low; the product purity is very high; the equipment requirements are simple; the synthesis period is short; the method is suitable for expanded production; a new way is provided for batch synthesis of the Fe2SSe; the obtained Fe2SSe is blocky-shaped particles; the microstructure is in a two-dimensional layer form; the agglomerate phenomenon is avoided; and the Fe2SSe with the two-dimensional layer structure is beneficial to intercalation and deintercalation of lithium ions in the charging and discharging processes when used as a lithium-ion negative electrode material.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery production, and in particular relates to a one-pot solid-phase method for synthesizing lithium-ion battery negative electrode material Fe 2 The method of SSe. Background technique [0002] As a lithium-ion battery anode material, it must have low pollution, recyclable, easy to carry, high specific capacity, long cycle charge and discharge life, no memory effect, fast charging, high voltage, low self-discharge rate, and automatically stop charging after fully charged , stable working voltage, long standby time and so on. At present, the anode materials that have been commercialized are mainly graphite electrodes. Although the graphite electrode has a stable working voltage, its capacity is too low (only 372mAh / g). Therefore, it is extremely urgent to find a cheap, high-capacity, and good cycle performance anode material. Fe and S resources are abundant and environmentally friendly. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397H01M4/04H01M10/0525
CPCH01M4/0471H01M4/1397H01M4/581H01M10/0525Y02E60/10
Inventor 郭胜平李加闯薛怀国
Owner YANGZHOU UNIV
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