Preparation method for lithium vanadium phosphate slurry-based positive electrode of lithium ion battery

A lithium ion battery, lithium vanadium phosphate technology, applied in battery electrodes, electrode manufacturing, electrode current collector coating, etc., can solve problems such as inability to achieve rate performance, and achieve inhibiting excessive growth, improving conductivity, and increasing rate and rate. The effect of cycle performance

Inactive Publication Date: 2017-05-17
中科天达(天津)新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this still cannot achieve a significant increase in Li 3 V 2 (PO 4 ) 3 rate performance

Method used

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  • Preparation method for lithium vanadium phosphate slurry-based positive electrode of lithium ion battery
  • Preparation method for lithium vanadium phosphate slurry-based positive electrode of lithium ion battery
  • Preparation method for lithium vanadium phosphate slurry-based positive electrode of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Li 3 V 2 (PO 4 ) 3 The preparation method of / C slurry and electrode sheet, comprises the following steps:

[0042] a, the 85wt% Li 3 V 2 (PO 4 ) 3 / C, 10wt% acetylene black and 5wt% polyvinylidene fluoride PVDF were dispersed in 10wt% N-methyl-2-pyrrolidone and ball milled for 5h to obtain a slurry (the total weight percentage was 110%);

[0043] b. Coating the slurry on the current collector, drying in vacuum at 120°C for 12 hours to obtain the electrode sheet;

[0044] c. Cut the electrode sheet into an area of ​​0.8cm 2 small pole pieces;

[0045] d. Assemble the electrode pieces into a button cell in an argon-filled glove box, and conduct electrochemical performance tests.

[0046] Figure 4 (a) is the scanning electron micrograph of the pole piece prepared in embodiment 1, from which it can be seen that there is Li of large particle size in the pole piece 3 V 2 (PO 4 ) particles.

[0047] Figure 4 (b) is the cycle performance diagram of the battery...

Embodiment 2

[0049] Li 3 V 2 (PO 4 ) 3 The preparation method of / C slurry and electrode sheet, comprises the following steps:

[0050] a, the 84wt% Li 3 V 2 (PO 4 ) 3 / C, 10wt% acetylene black, 5wt% PVDF and 1wt% LiCoO 2 Disperse in 10% N-methyl-2-pyrrolidone and ball mill for 5 hours to obtain a slurry, the total weight percentage is 110%;

[0051] b. Coating the slurry on the current collector, drying in vacuum at 120°C for 12 hours to obtain the electrode sheet;

[0052] c. Cut the electrode sheet into an area of ​​0.8cm 2 small pole pieces;

[0053] d. Assemble the electrode pieces into a button cell in an argon-filled glove box, and conduct electrochemical performance tests.

[0054] Figure 5 (a) is the scanning electron micrograph of the pole piece prepared in embodiment 2, from which it can be seen that there is still Li of large particle size in the pole piece 3 V 2 (PO 4 ) 3 / C particles, but with a reduced number of large particles.

[0055] Figure 5 (b) is th...

Embodiment 3

[0057] Li 3 V 2 (PO 4 ) 3 The preparation method of / C slurry and electrode sheet, comprises the following steps:

[0058] a, the 82wt% Li 3 V 2 (PO 4 ) 3 / C, 10wt% acetylene black, 5wt% PVDF and 3wt% LiCoO 2 Disperse in 10% N-methyl-2-pyrrolidone and ball mill for 5 hours to obtain a slurry (the total weight percentage is 110%);

[0059] b. Coating the slurry on the current collector, drying in vacuum at 120°C for 12 hours to obtain the electrode sheet;

[0060] c. Cut the electrode sheet into an area of ​​0.8cm 2 small pole pieces;

[0061] d. Assemble the electrode pieces into a button cell in an argon-filled glove box, and conduct electrochemical performance tests.

[0062] Image 6 (a) is the scanning electron micrograph of the pole piece prepared in embodiment 3, from which it can be seen that Li in the pole piece 3 V 2 (PO 4 ) 3 / C particles are smaller and evenly distributed.

[0063] Image 6 (b) is the cycle performance diagram of the battery assembl...

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Abstract

The invention provides a preparation method for a lithium vanadium phosphate slurry-based positive electrode of a lithium ion battery. The preparation method comprises the steps of dispersing Li<3>V<2>(PO<4>)<3>/C, a conductive agent, a binder and a slurry additive into N-methyl-2-pyrrolidone in a way of ball grinding or stirring to obtain uniformly-mixed and high-dispersity monoclinic Li<3>V<2>(PO<4>)<3>/C slurry, wherein the ratio of an active material to the conductive agent to the binder to the slurry additive to the N-methyl-2-pyrrolidone is (81-84wt%) to (9-11wt%) to (4-6wt%) to (1-6wt%) to 10wt%, and the total weight percentage is 110%; uniformly coating a current collector with the monoclinic Li<3>V<2>(PO<4>)<3>/C slurry in a spin-coating manner, and performing vacuum drying at a temperature of 100-120 DEG C to obtain a primary electrode plate; and cutting the primary electrode plate into a finished electrode plate with an area of 0.8-1.5cm<2> and performing electrical performance test on the finished electrode plate. The preparation method has the beneficial effects that the rate and cycling performance of the Li<3>V<2>(PO<4>)<3>/C can be simply and effectively improved due to the design.

Description

technical field [0001] The invention relates to the technical field of lithium battery electrode preparation, in particular to a method for preparing a lithium ion battery positive electrode based on lithium vanadium phosphate slurry. Background technique [0002] In recent years, lithium ion has become the most promising power source for hybrid electric vehicles and electric vehicles due to its advantages of high capacity, high power and environmental protection. The layered lithium cobalt oxide, the first-generation positive electrode material of lithium-ion batteries, has poor thermal stability, and there are serious safety hazards in electric vehicles. Polyanionic materials have good thermal stability, among which lithium iron phosphate with olivine structure and lithium vanadium phosphate with monoclinic structure are the most attractive. However, the voltage platform, energy density, and tap density of lithium iron phosphate are all low, and the electronic conductivit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/04H01M4/36H01M4/58H01M4/62
CPCH01M4/0404H01M4/1397H01M4/366H01M4/5825H01M4/62H01M4/625Y02E60/10
Inventor 唐致远
Owner 中科天达(天津)新能源科技有限公司
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