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Lithium ionic cell composite positive pole material coated by orthosilicate

A composite cathode material, lithium-ion battery technology, applied in electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve the problems of poor electrochemical performance of cathode materials, etc. The effect of easy large-scale production and convenient operation

Inactive Publication Date: 2008-11-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned surface coating process mainly uses water as a solvent, which will cause lithium ions to flow from the positive electrode material, especially LiNi. 1-x co x o 2 The dissolution in the medium, which leads to the deterioration of the electrochemical performance of the positive electrode material

Method used

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  • Lithium ionic cell composite positive pole material coated by orthosilicate
  • Lithium ionic cell composite positive pole material coated by orthosilicate
  • Lithium ionic cell composite positive pole material coated by orthosilicate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1.1791g (4.8mmol) of Mn(CH 3 COO) 2 Dissolve in a mixed solution of 10mL deionized water and 10mL ethanol, reflux and stir at 80°C for 1 hour, add 1.0289g (4.8mmol) of tetraethyl orthosilicate dropwise to the above mixed solution, stir for 12 hours, and 30g cathode material LiCoO 2 Add it, and then mechanically stir for 180 minutes to form a suspension, dry the suspension at 120°C for 12 hours, and then bake the sample at 700°C for 5 hours to obtain MnSiO 4 Coated LiCoO 2 . The coated product was tested by XRD, and the characterization results were as follows: figure 1 As shown, the product is α-NaFeO with a single crystal phase 2 type layered structure. The obtained electrode material was mixed with acetylene black conductive agent and PVDF binder in a mass ratio of 90:5:5, coated on the aluminum foil of the current collector, dried at 80°C, and then used a punching machine to make an electrode sheet with a diameter of 1 cm. The metal lithium sheet is the negati...

Embodiment 2

[0029] 0.9696g (2.4mmol) of Fe(NO 3 ) 3 and 0.2448g (2.4mmol) of CH 3 COOLi was dissolved in a mixed solution of 5mL deionized water and 10mL ethanol. After reflux stirring at 80°C for 0.5 hours, 0.5000g of tetraethyl orthosilicate was added dropwise to the above mixed solution. After stirring for 20 hours, 35g of positive electrode material LiCoO 2 Add it into it, form a suspension after mechanical stirring for 120 minutes, dry the suspension at 150°C for 15 hours, and then bake the sample at 650°C for 8 hours to obtain LiFeSiO 4 Coated LiCoO 2 Material. The XRD test of the coating material shows that the product is α-NaFeO with a single crystal phase 2 type layered structure, electrochemical tests and thermal analysis results show that LiFeSiO 4 Coated LiCoO 2 The material has good anti-overcharge performance and thermal stability.

Embodiment 3

[0031] 1.3522g (8.0mmol) of MnSO 4 ·H 2 O was dissolved in a mixed solution of 15mL deionized water and 10mL ethanol, and after reflux and stirring at 90°C for 2 hours, 1.6666g (8.0mmol) ethyl tetrasilicate was added dropwise to the above mixed solution, and after stirring for 8 hours, the 30g cathode material LiCoO 2 Add it into it, form a suspension after mechanical stirring for 120 minutes, dry the suspension at 100°C for 10 hours, and then bake the sample at 700°C for 8 hours to obtain MnSiO 4 Coated LiCoO 2 . The XRD test of the coated product shows that the product is α-NaFeO with a single crystal phase 2 type layered structure, electrochemical tests and thermal analysis results show that MnSiO 4 Coated LiCoO 2 It has good anti-overcharge performance and thermal stability.

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Abstract

A composite lithium ion battery anode material coated with orthosilicate and the preparation method thereof are disclosed, belonging to battery electrode material field and the preparation method field. The formula of orthosilicate is MSiO4(M is Mn,LiCo, LiFe) and the orthosilicate contains 0.1%-5.0% the mass of the electrode material. The preparation method of the composite anode material includes the following steps: firstly, preparing orthosilicate sol; adding the target anode material into the orthosilicate sol and mix the two thoroughly; drying and baking the mixture; in this way, coated and modified anode material can be obtained. The anode material is greatly improved in over-charging resistance and thermal stability while not reduced in specific capacity. Furthermore, the preparation method is simple in technique and convenient to operate and can effectively avoid the dissolution of the lithium ions and is easy to realize in large scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials and preparation thereof, and in particular provides lithium-ion battery composite cathode materials coated with orthosilicate and a preparation method thereof. Background technique [0002] With the rapid development of portable electronic products (such as mobile phones, digital cameras, notebook computers, etc.), power tools and electric vehicles, the market demand for high-power, high-energy-density batteries is increasing. Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, no memory effect and environmental friendliness, and have very broad development prospects. [0003] Since lithium-ion batteries were commercialized by Sony in 1990, LiCoO has been widely used as the cathode material. 2 . But LiCoO 2 The price is expensive, and the actual specific capacity is 120-140mAh / g, which is only about 50% of its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04B22F1/02B01J19/00H01M4/62
CPCY02E60/10
Inventor 杨文胜杨占旭
Owner BEIJING UNIV OF CHEM TECH
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