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Method for preparing cathode material of lithium iron phosphate lithium-ion battery

A lithium-ion battery and lithium iron phosphate technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of poor cycle stability, high cost, and low specific capacity, and achieve good crystallization, uniform composition, and Uniform particle size effect

Active Publication Date: 2010-06-30
哈尔滨昆宇新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems of low specific capacity, poor cycle stability and high cost of preparing lithium iron phosphate lithium ion battery cathode materials by the existing solid phase method, and provides a preparation method for lithium iron phosphate lithium ion battery cathode materials

Method used

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  • Method for preparing cathode material of lithium iron phosphate lithium-ion battery
  • Method for preparing cathode material of lithium iron phosphate lithium-ion battery

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specific Embodiment approach 1

[0013] Specific embodiment one: the preparation method of lithium ferrous phosphate lithium ion battery cathode material of the present embodiment is carried out according to the following steps: one, by lithium hydroxide: ferrous oxalate: the mol ratio of ammonium dihydrogen phosphate=1: 1: 1 Weigh lithium hydroxide powder, ferrous oxalate powder and ammonium dihydrogen phosphate powder and mix them evenly, then add conductive agent and lithium hydroxide of 0.3% to 2% of the total mass of lithium hydroxide, ferrous oxalate and ammonium dihydrogen phosphate , ferrous oxalate and ammonium dihydrogen phosphate total mass 3% ~ 25% of the dispersant to obtain the mixture; 2, the mixture obtained through step 1 is rolled through a double roller mill with a gap of 0.8mm ~ 1.2mm uniform, and then crushed into a powder with a fineness of 30 mesh to 50 mesh, and then repeat the extrusion and crushing process three times to obtain a uniformly mixed powder; 3. Put the powder obtained in s...

specific Embodiment approach 2

[0015] Embodiment 2: This embodiment differs from Embodiment 1 in that the conductive agent described in step 1 is one of acetylene black, earthy graphite, carbon fiber or graphite emulsion or a combination of several of them. Others are the same as in the first embodiment.

[0016] When the conductive agent of this embodiment is a composition, each conductive agent is mixed in an arbitrary ratio.

specific Embodiment approach 3

[0017] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the dispersant in Step 1 is one of kerosene, diesel or gasoline or a combination of several of them. Others are the same as in the first or second embodiment.

[0018] When the dispersant of this embodiment is a composition, each dispersant is mixed in an arbitrary ratio.

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Abstract

The invention provides a method for preparing a cathode material of a lithium iron phosphate lithium-ion battery, and relates to a method for preparing the cathode material of a lithium-ion battery. The invention solves the problems of low specific capacity, poor loop stability and high cost in the preparation of the cathode material of the lithium iron phosphate lithium-ion battery by the prior solid phase method t. The method comprises the following steps: firstly rolling lithium hydroxide, ferrous oxalate, ammonium dihydrogen phosphate, conductive agents and dispersants by a double-roll blender mill, crushing, sintering, rolling after adding pitch, crushing and resintering; or firstly extruding the lithium hydroxide, the ferrous oxalate, the ammonium dihydrogen phosphate, the conductive agents and the dispersants by a double-screw extruder, crushing, sintering, rolling after adding pitch, crushing and resintering. Compared with the materials using sucrose as the carbon source, the cost of the cathode material of the lithium iron phosphate lithium-ion battery is reduced by 40-55%, the specific capacity is 100mA.h / g-120mA.h / g, the cyclical stability is good, so the prepared cathode material can be applied to the batteries used by mobile telephones, notebook computers and electrocars.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] Olivine-type lithium iron phosphate has become a new generation of positive electrode materials for lithium-ion batteries with the most development and application potential due to its low price, environmental friendliness, excellent cycle performance, and outstanding safety performance. The existing industrialized solid-phase method for preparing lithium iron phosphate lithium ion battery cathode materials is to grind the raw materials and then sinter them at high temperature to obtain lithium iron phosphate. Uniformity, resulting in the heterogeneity of the local structure of the product, so that the specific capacity of the prepared lithium iron phosphate is only 90mA·h / g~100mA·h / g, and the cycle stability is poor; in the positive electrode material of lithium iron phosphate lithium ion battery Using expensive sucro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/58C01B25/45
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 宋殿权何元伟史鹏飞管云飞张华
Owner 哈尔滨昆宇新能源有限公司
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