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Hydrothermal synthesis method for nanowire/stick-like morphology manganese lithium silicate

A technology of hydrothermal synthesis, lithium manganese silicate, applied in structural parts, electrical components, battery electrodes, etc., to achieve wide application prospects, improved battery charge and discharge performance, and improved electrochemical performance.

Inactive Publication Date: 2012-09-26
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nanoscale Li with special morphology prepared by hydrothermal method combined with template method 2 MnSiO 4 Cathode materials have not been reported

Method used

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  • Hydrothermal synthesis method for nanowire/stick-like morphology manganese lithium silicate
  • Hydrothermal synthesis method for nanowire/stick-like morphology manganese lithium silicate
  • Hydrothermal synthesis method for nanowire/stick-like morphology manganese lithium silicate

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Experimental program
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Effect test

Embodiment 1

[0026] Weigh 0.12 moles of lithium hydroxide monohydrate, 0.015 moles of each of manganese acetate tetrahydrate and ethyl orthosilicate, LiOH·H 2 O:Mn(Ac) 2 ·4H 2 O: Ethyl orthosilicate = 8: 1: 1, put it into a ball mill, add 10wt% PVA and deionized water, and mill it at a speed of 150 rpm for 10 minutes; then pour the mixed liquid into a polytetrafluoroethylene In a stainless steel reactor lined with vinyl fluoride (volume 100ml), deionized water was added to form a liquid capacity of 80ml (80 vol%). It was sealed and placed in a homogeneous reactor, and the crystallization reaction was carried out at 200° C. for 72 hours at a speed of 10 rpm. After the reaction was completed, the reactor was taken out and cooled to room temperature. Wash with alcohol and deionized water, filter, and dry to obtain a hydrothermal crystallization product; in a high-purity nitrogen atmosphere, calcine at 550 °C for 8 hours to obtain Li 2 MnSiO 4 powder. The first discharge capacity reaches...

Embodiment 2

[0028] Weigh 0.03 mole of lithium hydroxide monohydrate, 0.015 mole of each of manganese acetate tetrahydrate and ethyl orthosilicate, LiOH·H 2 O:Mn(Ac) 2 ·4H 2 O: ethyl orthosilicate = 2: 1: 1, put it in a ball mill jar, add 20wt% PVA and deionized water, and ball mill at a speed of 160 rpm for 10 minutes; then pour the mixed solution into a polytetrafluoroethylene In a stainless steel reactor lined with vinyl fluoride (volume 100ml), deionized water was added to form a liquid volume of 70ml (accounting for 70vol%). It was sealed and placed in a homogeneous reactor, and the crystallization reaction was carried out at 180° C. for 48 hours at a speed of 20 rpm. After the reaction was completed, the reactor was taken out and cooled to room temperature. Wash with alcohol and deionized water, filter, and dry to obtain a hydrothermal crystallization product; in a high-purity argon atmosphere, calcine at 650 °C for 10 h to obtain Li 2 MnSiO 4 powder. The first discharge capaci...

Embodiment 3

[0030] Weigh 0.09 moles of lithium hydroxide monohydrate, 0.015 moles of each of manganese acetate tetrahydrate and ethyl orthosilicate, LiOH·H 2 O:Mn(Ac) 2 ·4H 2 O: ethyl orthosilicate = 6: 1: 1, put it into a ball mill jar, add 15wt% PVA and deionized water, and mill it at a speed of 170 rpm for 10 minutes; then pour the mixed solution into a polytetrafluoroethylene In a stainless steel reaction kettle lined with vinyl fluoride (volume 100ml), supplemented with deionized water to form a liquid capacity of 60ml (accounting for 60vol%). It was sealed and put into a homogeneous reactor, and the crystallization reaction was carried out at 220° C. for 24 hours at a rotation speed of 30 rpm. After the reaction was completed, the reactor was taken out and cooled to room temperature. Wash with alcohol and deionized water, filter, and dry to obtain a hydrothermal crystallization product; in a high-purity argon atmosphere, calcinate at 750 °C for 5 hours to obtain Li 2 MnSiO 4 po...

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Abstract

The invention discloses an organic additive assisted hydrothermal synthesis method for one-dimensional nanometre morphology manganese lithium silicate anode material, belonging to the technical field of electrochemical electrical source materials. In the method, cheap organic additives including polyvinyl alcohol (PVA) and ascorbic acid (VC) are adopted as morphology guide modulators, so that an one-dimensional nanometre morphology manganese lithium silicate anode material is directly acquired by combining a simple and easy soft template synthesis method with the hydrothermal synthesis method; simultaneously, a carbon source is in-situ introduced, and a calcining technology is further adopted to in-situ generate an Li2MnSiO4 / C composite anode material, so that the electrochemical performance of the electrode is greatly improved. Relative to a solid-phase method and a sol-gel method, a pure phase can be acquired easily, and battery charging and discharging performance of the electrode is greatly improved. Besides, the synthesis method provides a method for preparing manganese lithium silicate one-dimensional nanometre anode material and has a wide application prospect in the lithium-ion battery anode material.

Description

technical field [0001] The invention belongs to the technical field of electrochemical power supply material preparation, and in particular relates to a hydrothermal synthesis of nanowire / rod-shaped lithium ion battery cathode material lithium manganese silicate in the environment of adding organic matter that plays a special guiding role for crystal growth. method. Background technique [0002] Among various forms of nanomaterials, the preparation of one-dimensional nanomaterials and nanomaterials with special morphology is the key to the application of nanomaterials in nanodevices, catalysts and sensors. Since the 1980s, zero-dimensional materials have achieved Great progress has been made, but the preparation and research of one-dimensional nanomaterials still face huge challenges, and will become the focus of nanomaterials research for a long time in the future. [0003] The synthesis of one-dimensional nanomaterials mainly includes the following ideas: (1) use the anis...

Claims

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Application Information

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IPC IPC(8): H01M4/587
CPCY02E60/12Y02E60/10
Inventor 罗绍华刘瑶徐彩虹李亚敏蔡方田张雅倩
Owner 东北大学秦皇岛分校
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