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Preparation method of lithium ion battery cathode material of lithium manganese silicate

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of unsatisfactory electrochemical cycle performance and large energy loss of materials, and achieve shortened synthesis cycle, uniform mixing, and small particle size. Effect

Inactive Publication Date: 2012-03-28
MCNAIR TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Wengang Liu et al. synthesized Li at 800 °C by combining high-temperature solid phase and mechanical ball milling. 2 MnSiO 4 For positive electrode materials, this method consumes too much energy, and the electrochemical cycle performance of the material is not ideal. After 10 cycles, Li 2 MnSiO 4 The capacity is only 3.2mA·h / g

Method used

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  • Preparation method of lithium ion battery cathode material of lithium manganese silicate
  • Preparation method of lithium ion battery cathode material of lithium manganese silicate
  • Preparation method of lithium ion battery cathode material of lithium manganese silicate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 0.02mol of SiO 2 The aerogel was dissolved in 100ml deionized water, and was ultrasonicated for 50 minutes at a power of 180W before use. At the same time, weigh 0.04mol of CH 3 COOLi·2H 2 O (99%) and 0.02mol of Mn (CH 3 COO) 2 4H 2 O (99%) was dissolved in 100 ml of distilled water. At room temperature, SiO after sonication 2 The solution was slowly added dropwise to the above solution, and ultrasonicated at 80W for 25min. Afterwards, under the condition of constant stirring, 100ml solution prepared by 0.02mol citric acid and 0.04mol ethylene glycol was slowly added into the above 200ml mixed solution. After mixing evenly, the pH was adjusted to 5 with ammonia water, and the resulting solution was placed in a water bath at 80° C., and stirred continuously until a colloid was formed. Dry the obtained gel in a vacuum drying oven at 120°C for 12 minutes to obtain a dry gel. After being fully ground, place it at 350°C and fill it with N 2 Sintering in a tube furna...

Embodiment 2

[0027] 0.01mol of SiO 2 The aerogel was dissolved in 100ml deionized water, and was ultrasonicated for 60 minutes at a power of 190W before use. At the same time, weigh 0.02mol of CH 3 COOLi·2H 2 O (99%) and 0.01mol of Mn (CH 3 COO) 2 4H 2 O (99%) was dissolved in 100 ml of distilled water. At room temperature, SiO after sonication 2 The solution was slowly added dropwise to the above solution, and ultrasonicated at 90W for 25min. Afterwards, under the condition of constant stirring, 100ml solution prepared by 0.01mol citric acid and 0.02mol ethylene glycol was slowly added into the above 200ml mixed solution. After mixing evenly, the pH was adjusted to 6 with ammonia water, and the obtained solution was placed in a water bath at 80° C., and stirred continuously until a colloid was formed. The obtained gel was dried in a vacuum oven at 120°C for 12 hours to obtain a dry gel, which was fully ground and then placed at 350°C and filled with N 2 Sintering in a tube furnac...

Embodiment 3

[0029] 0.015mol of SiO 2 The aerogel was dissolved in 100ml of deionized water, and was ultrasonicated for 70min under the power of 200W for use. At the same time, weigh 0.03mol of CH 3 COOLi·2H 2 O (99%) and 0.015mol of Mn (CH 3 COO) 2 4H 2 O (99%) was dissolved in 100 ml of distilled water. At room temperature, SiO after sonication 2 The solution was slowly added dropwise to the above solution, and ultrasonicated at 90W for 30min. Afterwards, under the condition of constant stirring, 100ml solution prepared by 0.015mol citric acid and 0.03mol ethylene glycol was slowly added to the above 200ml mixed solution. After mixing evenly, the pH was adjusted to 7 with ammonia water, and the resulting solution was placed in a water bath at 80° C. and kept stirring until a colloid was formed. The obtained gel was dried in a vacuum oven at 120°C for 12 hours to obtain a dry gel, which was fully ground and then placed at 350°C and filled with N 2 Sintering in a tube furnace in t...

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Abstract

The invention relates to the technical field of battery materials, and especially relates to a preparation method of a lithium ion battery cathode material of lithium manganese silicate; the invention directly adopts SiO2 as a raw material, and the preparation process comprises the following steps of pretreatment, ultrasonic dissolution, glue preparation, gelation, drying, pre-roasting, and roasting; the raw material source of the invention is easily available; a ultrasonic assistant method is adopted to allow the mixing of the raw materials to be more uniform, and to inhibit the formation oflarge particles; not only the product particle size distribution is uniform, and the calcining temperature is reduced, but also the carbon generated by decomposition of a chelating agent during a heat treatment sintering phase is uniformly distributed in the raw materials; excessive growth of sample crystal grains is effectively inhibited, and the synthetic material has a fine particle size; especially the method is simple, convenient, and easy to control, greatly shortens the synthetic period, and reduces cost.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a method for preparing lithium manganese silicate, a positive electrode material of a lithium ion battery Background technique [0002] Lithium-ion batteries are widely used in communications, portable computers and electronic energy storage devices due to their high operating voltage, low self-discharge effect and good cycle performance. The advent of the 3G era has put forward higher requirements for lithium-ion batteries, especially for the energy density of lithium-ion battery cathode materials. Therefore, it is necessary to develop new cathode materials for lithium-ion batteries. [0003] In recent years, cathode materials prepared from cobalt oxides and nickel oxides are currently the most widely used materials, but materials prepared from cobalt and nickel have problems in terms of safety, material sources, and preparation processes. problems; and for other cat...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 魏怡李中延闫继唐致远罗永莉马莉刘东
Owner MCNAIR TECH
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