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Lithium cobalt iron phosphate lithium ion battery positive electrode material and preparation method thereof

A lithium ion battery, lithium iron cobalt phosphate technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of low redox potential, poor ionic conductivity, low rate performance, etc., to improve rate performance, improve Electrical conductivity, the effect of improving power density

Pending Publication Date: 2020-02-07
王燕清
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a lithium-ion battery positive electrode material of iron cobalt lithium phosphate and its preparation method, which solves the problems of high cost, poor thermal stability, and low rate performance of transition metal oxide lithium cobalt oxide positive electrode materials. At the same time, it solves the problem of low redox potential and poor ion conductivity of positive electrode materials such as polyanionic compound lithium iron phosphate

Method used

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  • Lithium cobalt iron phosphate lithium ion battery positive electrode material and preparation method thereof
  • Lithium cobalt iron phosphate lithium ion battery positive electrode material and preparation method thereof
  • Lithium cobalt iron phosphate lithium ion battery positive electrode material and preparation method thereof

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preparation example Construction

[0022] The molecular formula of tetrahydrofurothiazole is C 6 h 6 OS, the structural formula is The preparation method comprises the following steps:

[0023] (1) Pass N into the three-necked bottle 2 Exclude the air, then add 200-800mL of anhydrous N,N-dimethylformamide (DMF), then add propargyl ether and sulfur element in turn and stir evenly, then add tert-butanol peroxide (TBHP) and chlorinated Cuprous, the molar ratio of the four substances is 1:3-5:1.2-1.5:0.1-0.3, the three-necked bottle is placed in a constant temperature oil bath, heated to 115-125°C, and stirred at a constant speed for 24- 30h, the reaction was observed by TLC thin-layer chromatography. After the reaction of propargyl ether was complete, the solution was transferred into a separatory funnel, and distilled water and ethyl acetate were added successively to extract 3-5 times, and ethyl acetate was taken. The organic phase is concentrated under reduced pressure by a rotary evaporator, and the conce...

Embodiment 1

[0030] (1) Preparation of tetrahydrofurothiazole Inject N into the three-necked flask 2 Exclude the air, then add 200mL of anhydrous N,N-dimethylformamide (DMF), then add propargyl ether and sulfur element in turn and stir evenly, then add tert-butanol peroxide (TBHP) and cuprous chloride , the molar ratio of the four substances is 1:3:1.2:0.1, the three-necked bottle is placed in a constant temperature oil bath, heated to 115 ° C, stirred at a constant speed for 24 hours, and the reaction is observed by TLC thin layer chromatography. As a result, when the reaction of propargyl ether was complete, the solution was transferred into a separatory funnel, and distilled water and ethyl acetate were added successively for extraction 3 times. The organic phase of ethyl acetate was concentrated under reduced pressure by a rotary evaporator, and the concentrated mixture was passed through silica gel. The chromatographic column is separated by thin-layer chromatography, and the eluent...

Embodiment 2

[0035] (1) Preparation of tetrahydrofurothiazole Inject N into the three-necked flask 2 Exclude the air, then add 200mL of anhydrous N,N-dimethylformamide (DMF), then add propargyl ether and sulfur element in turn and stir evenly, then add tert-butanol peroxide (TBHP) and cuprous chloride , the molar ratio of the four substances is 1:3.5:1.3:0.15, the three-necked bottle is placed in a constant temperature oil bath, heated to 115 ° C, stirred at a constant speed for 26 hours, and the reaction is observed by TLC thin layer chromatography. As a result, when the reaction of propargyl ether was complete, the solution was transferred into a separatory funnel, and distilled water and ethyl acetate were added successively for extraction 3 times. The organic phase of ethyl acetate was concentrated under reduced pressure by a rotary evaporator, and the concentrated mixture was passed through silica gel. The chromatographic column is separated by thin-layer chromatography, and the elu...

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Abstract

The invention relates to the technical field of lithium ion battery positive electrode materials, and discloses a lithium cobalt iron phosphate lithium ion battery positive electrode material. The positive electrode material is prepared from the following raw materials: C-LiCo<0.15-0.35>Fe<0.65-0.85>PO4, tetrahydrofuro thiazole, an initiator and sodium dodecyl sulfate. According to the lithium cobalt iron phosphate lithium ion battery positive electrode material, the carbon-coated Co-doped LiFePO4 with excellent electric conduction performance promotes the conduction and diffusion of charges and Li+ ions between the positive electrode material and the electrolyte in the charging and discharging processes of the battery and improves the power density of the positive electrode material andthe electric capacity of the lithium ion battery, the polytetrahydrofuro thiazole with very high conductivity forms a conductive network structure with the surface of C-LiCo<0.15-0.35>Fe<0.65-0.85>PO4to provide migration and diffusion channels for charges and Li+ ions, and the polytetrahydrofuro thiazole plays a role in coating and protecting, avoids structural loss caused by direct contact between LiCo<0.15-0.35>Fe<0.65-0.85>PO4 and the electrolyte, and enhances the electrochemical stability and rate capability of the positive electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a lithium-ion battery cathode material of iron-cobalt-lithium phosphate and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries with excellent performance. They have the advantages of high voltage, large capacity, low consumption, small internal resistance, and many cycles. Lithium-ion batteries are mainly composed of electrolytes, isolation materials, and positive and negative materials. Lithium-ion batteries use lithium intercalation compounds that reversibly intercalate and deintercalate lithium ions as the positive and negative electrodes of the battery, and the positive electrode material directly affects the electrochemical performance of the lithium-ion battery. [0003] At present, lithium-ion battery cathode materials are transition metal oxides lithium cobalta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/624H01M4/625H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 王燕清
Owner 王燕清
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