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Lithium battery electrode material

An electrode material, lithium battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem of insufficient contact with lithium iron phosphate, reduce the electrochemical performance of lithium iron phosphate/lithium vanadium phosphate composite positive electrode materials, and lithium ion is not easy problem of adequate diffusion

Active Publication Date: 2010-10-13
TSINGHUA UNIV +1
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  • Abstract
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Problems solved by technology

[0004] However, when the composite positive electrode material is used in a lithium battery, due to the uniform distribution of lithium iron phosphate and lithium vanadium phosphate in the bulk composite lithium iron phosphate / lithium vanadium phosphate composite positive electrode material, part of the electrolyte cannot be mixed with Lithium iron phosphate is in direct contact, so that the lithium iron phosphate with poor lithium ion diffusion performance is not in sufficient contact with the electrolyte, so that the lithium iron phosphate in the lithium iron phosphate / lithium vanadium phosphate composite positive electrode material is not easy to fully diffuse to In the electrolyte, the electrochemical performance of the entire lithium iron phosphate / lithium vanadium phosphate composite positive electrode material is reduced

Method used

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Embodiment Construction

[0031] The lithium battery electrode material provided by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] see figure 1 and figure 2 , the embodiment of the present invention provides a lithium iron phosphate / lithium vanadium phosphate (LiFePO 4 / Li 3 V 2 (PO 4 ) 3 ) composite electrode material 10, which includes a plurality of evenly distributed lithium iron phosphate / lithium vanadium phosphate composite particles 100, and each lithium iron phosphate / lithium vanadium phosphate composite particle 100 includes lithium vanadium phosphate (Li 3 V 2 (PO 4 ) 3 ) particles 102 and lithium iron phosphate (LiFePO 4 ) granular layer 104.

[0033] In each lithium iron phosphate / lithium vanadium phosphate composite particle 100, the shape of the lithium vanadium phosphate particle 102 is preferably spherical or spherical, with a diameter of 1 micron to 50 microns, preferably 5 micr...

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Abstract

The invention discloses a lithium battery electrode material, comprising a plurality of uniformly distributed lithium iron phosphate / lithium vanadium phosphate composite particles. The material is characterized in that each lithium iron phosphate / lithium vanadium phosphate composite particle comprises a lithium vanadium phosphate particle and a lithium iron phosphate particle layer uniformly coated on the surface of the lithium vanadium phosphate particle, wherein, the lithium iron phosphate particle layer comprises a plurality of lithium iron phosphate particles.

Description

technical field [0001] The invention relates to a lithium battery electrode material, in particular to a lithium iron phosphate / lithium vanadium phosphate composite electrode material. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) and lithium vanadium phosphate (Li 3 V 2 (PO 4 ) 3 ) Electrode materials have attracted much attention due to their advantages of stable structure, good safety, and abundant resources. At the same time, studies have shown that the two electrode materials also have other inherent characteristics. Lithium iron phosphate electrode materials have good high-temperature performance and cycle performance, and high theoretical specific capacity, but because the insertion and extraction of lithium ions are carried out in a one-dimensional direction , so the ion conductivity is poor, the high-rate charge-discharge performance and low-temperature performance are poor; the diffusion of lithium ions in the lithium vanadium phosphate elec...

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Application Information

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IPC IPC(8): H01M4/136
CPCY02E60/122Y02E60/10
Inventor 杨改姜长印高剑应皆荣李建军何向明
Owner TSINGHUA UNIV
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