Preparation method of lithium ferric phosphate / grapheme composite positive electrode material

A graphene composite, lithium iron phosphate technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of uneven distribution of graphene, unsatisfactory electrical conductivity, rate performance, agglomeration, etc., to achieve low internal resistance, Excellent heat dissipation performance and long cycle life

Active Publication Date: 2011-08-31
JIANGSU LENENG BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the direct addition of graphene in lithium iron phosphate can easily cause the distribution of graphene in lithium iron phosphate to be uneven, and phenomena such as agglomeration occur, the lithium iron phosphate / graphene composite positive electrode material prepared by the current preparation method is conductive. The performance and magnification performance are not very ideal

Method used

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  • Preparation method of lithium ferric phosphate / grapheme composite positive electrode material
  • Preparation method of lithium ferric phosphate / grapheme composite positive electrode material
  • Preparation method of lithium ferric phosphate / grapheme composite positive electrode material

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Embodiment 1

[0021] The preparation method of lithium iron phosphate / graphene composite cathode material in this embodiment, the specific steps are as follows:

[0022] (1) Preparation of lithium iron phosphate precursor

[0023] Weigh 6g of iron powder with a particle diameter of 20nm, 37g of lithium carbonate, 173g of ferrous oxalate and 116g of ammonium dihydrogen phosphate, put them into a ball mill jar, then add 3320g of absolute ethanol as a dispersant to the ball mill jar, and put them into a ball mill Ball milling for 6 hours to obtain a lithium iron phosphate precursor;

[0024] (2) Preparation of lithium iron phosphate / graphene composite cathode material

[0025] First, graphene is grown on the lithium iron phosphate precursor: the lithium iron phosphate precursor prepared in step (1) is vacuum-dried at 60°C for 12 hours, then put into a tube furnace, and the tube furnace is evacuated, and then applied to the tube Nitrogen gas is introduced into the tube furnace and heated to m...

Embodiment 2

[0028] The preparation method of lithium iron phosphate / graphene composite cathode material in this embodiment, the specific steps are as follows:

[0029] (1) Preparation of lithium iron phosphate precursor

[0030] Weigh 10g of cobalt powder with a particle diameter of 1nm, 10g of lithium nitrate, 45g of ferric phosphate and 30g of diammonium hydrogen phosphate, put them into a ball mill jar, then add 475g of distilled water as a dispersant to the ball mill jar, put them into a ball mill and mill them for 6 hours , making lithium iron phosphate precursor;

[0031] (2) Preparation of lithium iron phosphate / graphene composite cathode material

[0032] First, graphene is grown on the lithium iron phosphate precursor: the lithium iron phosphate precursor prepared in step (1) is vacuum-dried at 60°C for 12 hours, then put into a tube furnace, and the tube furnace is evacuated, and then applied to the tube Pass hydrogen into the tube furnace and heat it so that the temperature i...

Embodiment 3

[0035] The preparation method of lithium iron phosphate / graphene composite cathode material in this embodiment, the specific steps are as follows:

[0036] (1) Preparation of lithium iron phosphate precursor

[0037] Weigh 5g of iron powder with a particle diameter of 200nm, 10g of nickel powder with a particle diameter of 100nm, 15g of lithium hydroxide, 40g of ferric oxide and 30g of ammonium phosphate, put them into a ball mill jar, then add 500g of distilled water to the ball mill jar for The dispersant is put into a ball mill and ball milled for 6 hours to obtain a lithium iron phosphate precursor;

[0038] (2) Preparation of lithium iron phosphate / graphene composite cathode material

[0039] First, graphene is grown on the lithium iron phosphate precursor: the lithium iron phosphate precursor prepared in step (1) is vacuum-dried at 60°C for 12 hours, then put into a tube furnace, and the tube furnace is evacuated, and then applied to the tube Nitrogen is fed into the t...

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Abstract

The invention discloses a preparation method of a lithium ferric phosphate / grapheme composite positive electrode material. The method comprises the following steps of: (1) preparing a lithium ferric phosphate precursor, namely weighing raw materials such as a catalyst, lithium salt, ferric salt and phosphate, adding the raw materials into a dispersing agent, and ball-milling to obtain the lithium ferric phosphate precursor; and (2) growing grapheme on the lithium ferric phosphate precursor first, then closing carbon source gas and ammonia gas, introducing hydrogen into a reactor, adjusting the temperature of the interior of the reactor to be 600 to 800 DEG C at a speed of 10 to 20 DEG C per minute in the process of hydrogen introduction, keeping the temperature of the interior of the reactor constant for 24 to 48 hours, and then cooling a product which is obtained in the reactor in the nitrogen atmosphere to room temperature so as to prepare the lithium ferric phosphate / grapheme composite positive electrode material. The lithium ferric phosphate / grapheme composite positive electrode material which is prepared by the method is high in conducting performance and high in power multiplying performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery cathode materials, in particular to a preparation method of lithium iron phosphate / graphene composite cathode materials. Background technique [0002] Lithium iron phosphate battery is a new type of power battery developed in recent years. Lithium iron phosphate battery has become a research hotspot in recent years because of its safety, long cycle life, large capacity, high temperature resistance and environmental protection. However, the conductivity of lithium iron phosphate is poor, the diffusion rate of lithium ions is slow, and the actual specific capacity is low during high-rate charge and discharge. These problems restrict the development of lithium iron phosphate industrialization. In order to improve the conductivity and rate performance of lithium iron phosphate batteries, in the production process of lithium-ion battery electrode pole pieces, adding conductive agents to pos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 丁建民
Owner JIANGSU LENENG BATTERY INC
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