Positive pole lithium iron phosphate/carbon composite material for low-temperature battery and preparation method of composite material

A carbon composite material, lithium iron phosphate technology, applied in battery electrodes, phosphorus compounds, chemical instruments and methods, etc., can solve the problem of poor low-temperature discharge performance of lithium iron phosphate nanocrystals, high reaction equipment requirements, and increased cost pressures, etc. problems, to achieve the effect of shortening the high temperature calcination time, simplifying the synthesis process, reducing energy consumption and production costs
CN104393293AInactive Publication Date: 2015-03-04CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
Publication Date
2015-03-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method of a positive pole lithium iron phosphate / carbon composite material for a low-temperature battery. The preparation method comprises the following steps: by adopting a ferrous compound as a raw material, and weighing the ferrous compound, a lithium compound and a phosphorus compound according to the mole ratio of Fe:Li:P=(0.98-1):(1-1.02):1; respectively dissolving or dispersing in deionized water; adding to a liquid-phase reducing agent with moderate volume according to a certain sequence; carrying out reflux reaction at specific temperature; carrying out solid-liquid separation to obtain lithium iron phosphate precursor; then calcining under the protection of inert gas to prepare the LiFePO4 / C composite positive pole material. Compared with other methods, the preparation method disclosed by the invention has the advantages of simple process equipment, moderation in condition, completeness in precursor crystallization, great shortening of high-temperature calcination time, great reduction of energy consumption, fine lithium iron phosphate particle diameter and more excellent normal-temperature discharge property and low-temperature charge-discharge property.
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Description

technical field

[0001] The invention relates to the field of cathode materials for lithium ion batteries, in particular to a method for preparing a cathode material lithium iron phosphate / carbon composite material for low-temperature lithium ion batteries. technical background

[0002] With the emergence of new materials and improvements in battery design technology, the application range of lithium-ion batteries continues to expand. The civilian field has expanded from the information industry to energy transportation. In the field of national defense and military affairs, lithium-ion batteries cover many arms such as land, sea, air, and space. Among them, when military equipment needs to work in cold regions (such as below -40°C), the low-temperature electrochemical performance of lithium-ion batteries is extremely high. However, the charge-discharge performance of lithium-ion batteries in low-temperature environments below -20°C decays significantly. , greatly restricti...

Claims

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