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A kind of cathode material for lithium ion battery and preparation method thereof

A lithium-ion battery and positive electrode material technology, applied in the field of materials science, can solve the problems of low reversible capacity, fast cycle attenuation, poor rate performance, etc.

Inactive Publication Date: 2019-05-24
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a positive electrode material for a lithium ion battery and a preparation method thereof. The positive electrode material for a lithium ion battery and a preparation method thereof should solve the problem of lithium ion in the prior art. The low electronic conductivity and lithium ion migration rate of lithium iron borate materials for batteries lead to technical problems of low reversible capacity, poor rate performance and fast cycle attenuation

Method used

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  • A kind of cathode material for lithium ion battery and preparation method thereof
  • A kind of cathode material for lithium ion battery and preparation method thereof
  • A kind of cathode material for lithium ion battery and preparation method thereof

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preparation example Construction

[0064] Battery preparation and electrochemical performance testing method

[0065] (1) Preparation of battery cathode sheet

[0066] The obtained positive electrode material for lithium-ion batteries, lithium iron chromium borate / carbon composite material, conductive carbon powder, and organic binder polyvinylidene fluoride (PVDF) are mixed according to a mass ratio of 8:1:1 to obtain a mixed powder. 10 grams of the mixed powder was added with 35 grams of organic solvent N-methylpyrrolidone (NMP), stirred thoroughly to form a slurry, coated with the surface of aluminum foil, dried, and rolled several times to obtain the positive electrode sheet of the battery;

[0067] (2), battery assembly and performance testing

[0068] The electrochemical performance of lithium iron chromium borate / carbon composites was evaluated using a 2016-type half-cell. The rolled battery pole piece is stamped into a disc with a diameter of 12 mm. After accurately weighing its mass, the mass of th...

Embodiment 1

[0071] A kind of preparation method of lithium iron chromium borate lithium / carbon composite material of cathode material for lithium ion battery, specifically comprises the following steps:

[0072] Step 1, adding 88 parts by weight of lithium hydroxide into 500 parts by weight of deionized water for ultrasonic dissolution to obtain a clear solution of lithium hydroxide, adding 124 parts by weight of boric acid into 800 parts by weight of deionized water, and slowly adding the dissolved lithium hydroxide dropwise to In the aqueous solution of boric acid, a clear solution is obtained after the reaction is complete;

[0073] Step 2, after cooling the clarified solution obtained in step 1 to room temperature, put it into a sand mill for ball milling, then add 359 parts by weight of ferrous oxalate, mill for 3 hours, add 170 parts by weight of caramel and 2 parts by weight of chromium nitrate, and continue ball milling 1h, control the amount of ball milling product to 5000 parts ...

Embodiment 2

[0077] A kind of preparation method of lithium iron chromium borate lithium / carbon composite material of cathode material for lithium ion battery, specifically comprises the following steps:

[0078] Step 1, adding 88 parts by weight of lithium hydroxide into 500 parts by weight of deionized water for ultrasonic dissolution to obtain a clear solution of lithium hydroxide, adding 124 parts by weight of boric acid into 800 parts by weight of deionized water, and slowly adding the dissolved lithium hydroxide dropwise to In the aqueous solution of boric acid, a clear solution is obtained after the reaction is complete;

[0079] Step 2, after cooling the clarified solution obtained in step 1 to room temperature, add it to a sand mill for ball milling, then add 358 parts by weight of ferrous oxalate, mill for 3 hours, add 170 parts by weight of caramel and 4 parts by weight of chromium nitrate, and continue ball milling 1h, control the amount of ball milling product to 5000 parts by...

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Abstract

The invention provides a positive electrode material for lithium ion batteries, and the chemical formula of the positive electrode material is LiFe1-xCrxBO3 / C, wherein x is greater than or equal to 0.005 and smaller than or equal to 0.01. The invention also provides a preparation method of the positive electrode material for the lithium ion batteries. The preparation method comprises the following steps: adding lithium hydroxide in deionized water for ultrasonic dissolution, preparing a boric acid water solution, adding lithium hydroxide into the boric acid water solution, and obtaining a clear solution after the reaction is completed; then carrying out ball milling after cooling to room temperature, and then adding ferrous oxalate for ball milling; then adding caramel and chromic nitrate for continuous ball milling; adding deionized water during discharging, and controlling the quantity of a ball milling product; spraying and drying the ball milling product to obtain spherical lithium ferric borate precursor powder; controlling the temperature to be 500 to 600 DEG C for calcinations so as to obtain an iron-chromium-lithium borate / carbon composite material of the positive electrode material for the lithium ion battery. The iron-chromium-lithium borate / carbon composite material provided by the invention has relatively high specific capacity and good rate performance and cycle performance.

Description

technical field [0001] The invention belongs to the field of materials science, and relates to a lithium ion battery material, in particular to a preparation method of a lithium iron chromium borate lithium / carbon composite material for a positive electrode material of a lithium ion battery. Background technique [0002] The environmental crisis caused by the oil energy crisis and environmental pollution forces people to look for new clean and recyclable new energy materials. As a result, environmentally friendly lithium-ion batteries came into being. LiFePO with olivine structure 4 Cathode materials have been deeply researched, and have dominated the power battery market in recent years, with their outstanding advantages such as low price, good safety performance, and environmental friendliness. However, the theoretical specific capacity of lithium iron phosphate itself is only 170mAh / g, and the conductivity is poor, the high rate charge and discharge performance is not g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 章冬云董晓晓乔金丰平周江赵萌秦雯
Owner SHANGHAI INST OF TECH