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Conductive agent for lithium iron phosphate cathode material and preparation method thereof

A cathode material, lithium iron phosphate technology, used in circuits, electrical components, battery electrodes, etc., can solve the problems of inability to form a stable conductive network, falling off active materials, and falling powder from the cathode sheet, to improve AC impedance performance, increase The effect of low electrical conductivity and energy consumption

Inactive Publication Date: 2018-11-23
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a conductive agent for lithium iron phosphate positive electrode material and its preparation method, so as to solve the problem that the existing lithium iron phosphate positive electrode material has low electrical conductivity and is prone to powder dropping of the positive electrode sheet leading to activity. Substance shedding and inability to form a stable conductive network

Method used

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  • Conductive agent for lithium iron phosphate cathode material and preparation method thereof
  • Conductive agent for lithium iron phosphate cathode material and preparation method thereof
  • Conductive agent for lithium iron phosphate cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Place the spiral carbon nanofibers in a high-temperature graphitization furnace, introduce protective gas, heat up to 1200~1600°C, hold time for 1.5h, perform high-temperature graphitization treatment, and then naturally cool to room temperature in the furnace to obtain Purified spiral carbon nanofibers;

[0031] 2) Weigh 1g of LA132 and dissolve it in pure water to prepare a 34ml LA132 solution with a mass fraction of 3%. Use a pipette to take 3.4ml of LA132 solution in an agate mortar, and add 0.01g in two steps. Step 1) Prepare the purified spiral carbon nanofibers and grind them until they are evenly dispersed. Finally, add 0.09g conductive carbon black in two batches to grind. Evenly dispersed, the conductive agent for lithium iron phosphate cathode material is obtained.

Embodiment 2

[0033] 1) Soak the spiral carbon nanofibers in 36% concentrated nitric acid for 10 minutes, and then repeatedly rinse, filter and dry with deionized water to obtain purified spiral carbon nanofibers;

[0034] 2) Weigh 1g polyvinylidene fluoride and dissolve it in N-methylpyrrolidone to prepare a 25ml polyvinylidene fluoride solution with a mass fraction of 4%. Use a pipette to take 2.5ml of polyvinylidene fluoride solution in an agate mortar, and then add 0.02g in 3 times. Step 1) Prepare the purified spiral carbon nanofibers and grind them until they are evenly dispersed. Finally, add 0.08g conductive in 3 times The carbon black is uniformly ground and dispersed to obtain a conductive agent for lithium iron phosphate cathode material.

Embodiment 3

[0036] 1) Place the spiral carbon nanofibers in a high-temperature graphitization furnace, pass protective gas, heat up to 1200~1600℃, hold time for 2h, perform high-temperature graphitization treatment, and then naturally cool to room temperature in the furnace to obtain purification After the spiral carbon nanofiber;

[0037] 2) Weigh 1g of polytetrafluoroethylene and dissolve it in N-methylpyrrolidone to prepare a 20ml polytetrafluoroethylene solution with a mass fraction of 5%. Use a pipette to take 2ml of the polytetrafluoroethylene solution in an agate mortar, and then Add 0.03g in 4 times. Step 1) Prepare the purified spiral carbon nanofibers and grind them until they are evenly dispersed. Finally, add 0.07g of conductive carbon black in 4 times to grind and disperse evenly to obtain the conductive agent for lithium iron phosphate cathode material.

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Abstract

The invention discloses a conductive agent for a lithium iron phosphate cathode material and a preparation method thereof. The conductive agent comprises spiral carbon nanofibers, conductive carbon black and a binder. The spiral carbon nanofibers and the conductive carbon black in the prepared mixed conductive agent are subjected to cooperative compatibility, the conductive carbon black is effectively distributed gaps formed by pole piece active substances, the spiral carbon fibers are effectively distributed between the pole piece active substances, because of the bent morphology characteristic of the spiral carbon fibers, the active substances can be better wound, thus pole piece particles are in close contact, a continuous phase conductive network is formed, the conductivity is increased, and the fixation effect of the pole piece active substances is enhanced. Compared with a single Super P conductive agent, the specific capacity and the rate capability of a lithium iron phosphate battery are improved, and meanwhile, the charge transfer impedance is also reduced. The conductive agent for the lithium iron phosphate cathode material and the preparation method thereof have the advantages of easy operation and low cost, and have good economic value and application prospects.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and specifically relates to a conductive agent for lithium iron phosphate cathode materials and a preparation method thereof. Background technique [0002] Nowadays, under the dual pressure of environment and energy and under the influence of sustainable economic development, finding new energy to replace the vacancies caused by non-renewable resources and researching and developing energy-saving and environmentally-friendly energy storage and conversion materials have become scientific research at home and abroad. hot topic. Lithium-ion batteries with high energy density and safety and efficiency have become the focus of the new energy industry. Lithium-ion batteries mainly include several research hotspots such as cathode materials, separators, electrolytes, conductive agents, binders, and anode materials. Since most of the current cathode materials have low intrinsic conducti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 陈建周孝林龚勇刘平刘莎
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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