Synthetic method for cathode material lithium cobaltous phosphate used for lithium ion batteries

A lithium-ion battery, lithium cobalt phosphate technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve the problem of high energy consumption, uniformity, consistency, poor reproducibility, and large particle size. and other problems, to achieve the effect of increasing specific capacity and improving rate characteristics

Inactive Publication Date: 2013-11-27
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Zhao Yujuan et al. (Rare Metals, 2009, 28( 2): 117-121) successfully synthesized orthorhombic LiCoPO4 by using hydrothermal synthesis method. Under the current conditions, the specific capacity of the first charge is 154mAh / g, but the specific capacity of the first discharge is only 65mAh / g, and there is still a long way to go before the application
[0009]Through the above analysis, it can be found that the sintering time of the solid phase method is long, the energy consumption is large, the production efficiency is low, the particle size distribution of the product is not easy to control, the uniformity, consistency, poor reproducibility
The products of microwave synthesis method and hydrothermal synthesis method generally have large particle size, which is not conducive to the migration of lithium ions, and the electrochemical performance is not ideal
[0010] In summary, the above-mentioned synthesis methods of various lithium cobalt phosphate positive electrode materials all have technical problems such as low specific capacity of the lithium cobalt phosphate positive electrode material obtained finally

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  • Synthetic method for cathode material lithium cobaltous phosphate used for lithium ion batteries
  • Synthetic method for cathode material lithium cobaltous phosphate used for lithium ion batteries
  • Synthetic method for cathode material lithium cobaltous phosphate used for lithium ion batteries

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preparation example Construction

[0036] Battery preparation and electrochemical performance testing methods

[0037] ① Preparation of battery positive electrode sheet

[0038] Calculate the lithium cobalt phosphate lithium ion battery cathode material, conductive carbon powder, and organic binder polyvinylidene fluoride (PVDF) according to the mass ratio, that is, the lithium ion battery cathode material cobalt lithium phosphate: conductive carbon powder: organic binder Polyvinylidene fluoride is mixed at a ratio of 92:3:5 to obtain a mixed powder. Add 10 grams of the mixed powder to 12 grams of organic solvent N-methylpyrrolidone (NMP), stir well to form a slurry, and coat Cover the surface of aluminum foil, after drying, roll it several times to obtain the positive electrode sheet of the battery;

[0039] ②, battery assembly and performance testing

[0040] The electrochemical performance of obtained lithium cobalt phosphate was evaluated using a 2016-type half-cell. The rolled positive electrode sheet o...

Embodiment 1

[0045] A method for synthesizing lithium cobalt phosphate, an anode material for lithium ion batteries, using lithium hydroxide, cobalt acetate, phosphoric acid, nitric acid, sucrose and deionized water as raw materials, the raw materials are calculated in parts by mass, and their composition and content are as follows:

[0046] Lithium hydroxide 42 parts

[0047] Cobalt acetate 249 parts

[0048] Phosphoric acid 115 parts

[0049] 15 parts nitric acid

[0050] 15 parts sucrose

[0051] 650 parts of deionized water;

[0052] Its synthetic method specifically comprises the following steps:

[0053] (1), 249 parts of cobalt acetate are dissolved in 300 parts of deionized water to make cobalt acetate aqueous solution;

[0054] 42 parts of lithium hydroxide and 15 parts of sucrose are dissolved in 250 parts of deionized water to form lithium hydroxide / sucrose mixed solution;

[0055] Add 115 parts of phosphoric acid to 100 parts of deionized water to make a phosphoric acid s...

Embodiment 2

[0063] A method for synthesizing lithium cobalt phosphate lithium ion battery anode material, that is, using lithium hydroxide, cobalt acetate, phosphoric acid, nitric acid, sucrose and deionized water as raw materials, the raw materials are calculated in parts by mass, and their composition and content are as follows :

[0064] Lithium hydroxide 38 parts

[0065] Cobalt acetate 224 parts

[0066] Phosphoric acid 105 parts

[0067] 15 parts nitric acid

[0068] 15 parts sucrose

[0069] 650 parts of deionized water;

[0070] Its synthetic method specifically comprises the following steps:

[0071] (1), 224 parts of cobalt acetate are dissolved in 300 parts of deionized water to make cobalt acetate aqueous solution;

[0072] 38 parts of lithium hydroxide and 15 parts of sucrose are dissolved in 250 parts of deionized water to form lithium hydroxide / sucrose mixed solution;

[0073] Add 105 parts of phosphoric acid to 100 parts of deionized water to make a phosphoric acid ...

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Abstract

The invention discloses a synthetic method for a cathode material lithium cobaltous phosphate used for lithium ion batteries. The method comprises a step of dissolving cobaltous acetate in deionized water to prepare an aqueous solution of the cobaltous acetate; a step of dissolving lithium hydroxide and sucrose in deionized water to prepare a lithium hydroxide/sucrose mixed solution; a step of adding phosphoric acid in deionized water to prepare a phosphoric acid solution; a step of adding the phosphoric acid solution into the aqueous solution of the cobaltous acetate to obtain a burgundy emulsion, stirring uniformly, adding the lithium hydroxide/sucrose mixed solution into the burgundy emulsion, mixing uniformly, and adding nitric acid to obtain a precursor solution; a step of subjecting the precursor solution under stirring to spray drying to obtain a precursor of lithium cobaltous phosphate powder; and a step of subjecting the precursor of the lithium cobaltous phosphate powder to vacuum calcination at 600-750 DEG C for 16-26 h to obtain the cathode material lithium cobaltous phosphate with a spherical porous structure and a high specific capacity.

Description

technical field [0001] The invention relates to a method for synthesizing a positive electrode material cobalt lithium phosphate for a lithium ion battery, in particular to a method for synthesizing a positive electrode material cobalt lithium phosphate for a lithium ion battery with a spherical porous structure. Background technique [0002] Based on the current serious energy crisis and pollution problems, countries all over the world attach great importance to the development of electric vehicles, and my country's 863 plan also lists the development of electric vehicles as an important development direction. The research on the power battery as vehicle power has become the main bottleneck in the development of power vehicles. Currently the dominant battery systems on the market are lithium-ion batteries and nickel-hydrogen batteries, which are gradually replacing nickel-cadmium batteries and lead-acid battery systems for transmission. Lithium-ion batteries have been wide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397B82Y30/00B82Y40/00
CPCY02E60/122Y02E60/10
Inventor 常程康邓玲王永强史运伟罗紫瑶汤越吕靖
Owner SHANGHAI INST OF TECH
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