Lithium ion battery anode material manganese lithium phosphate and preparation method thereof

A lithium ion battery, lithium manganese phosphate technology, applied in electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve the problems of low purity of synthetic products, poor electrochemical performance, high production cost, and achieve excellent cycle stability, Low production cost and low environmental impact

Active Publication Date: 2008-12-10
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw materials used in the high-temperature solid-phase method are lithium salts, manganese salts, and phosphates, which are pre-calcined, followed by carbon reduction or hydrogen reduction roasting. question

Method used

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  • Lithium ion battery anode material manganese lithium phosphate and preparation method thereof
  • Lithium ion battery anode material manganese lithium phosphate and preparation method thereof
  • Lithium ion battery anode material manganese lithium phosphate and preparation method thereof

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preparation example Construction

[0038] The preparation method of lithium manganese phosphate lithium ion battery cathode material of the present invention adopts the following steps:

[0039] 1. Preparation of nanoparticles: Lithium source compounds, manganese source compounds, phosphorus source compounds and carbon materials are processed by wet ultra-fine ball milling into submicron or nanoscale particles, which are one-time molding particles, water-soluble manganese source compounds and Carbon materials do not need to be processed in this step. The wet ultra-fine ball mill adopts the SX-2 circulation stirring ball mill of Wuxi Xinguang Powder Processing Technology Co., Ltd., and other ball milling or crushing equipment can also be used: stirring ball mill, sand mill, colloid mill, jet mill, Impact micro-powder ball mill, airflow vortex micro-powder machine, impact pulverizer or rod mechanical pulverizer. Lithium source compounds are lithium hydroxide LiOH, lithium carbonate Li 2 CO 3 , lithium acetate ...

Embodiment 1

[0051] Example 1, the raw materials lithium hydroxide, manganese dioxide, ammonium dihydrogen phosphate and conductive acetylene carbon black were respectively pulverized to a particle size of nanometer order, and 401.3 grams of lithium hydroxide, 811.5 grams of manganese dioxide, and 1099.8 grams of ammonium dihydrogen phosphate were accurately weighed. gram and 114.8 grams of conductive acetylene carbon black were added successively to 1500 milliliters of 20° C. deionized water, and stirred at constant temperature for 3 hours.

[0052] After adding 0.1wt.% CuO to the above sample, ball mill at a speed of 500r / min for 0.5 hours, spray dry and granulate at 100°C, and perform fusion treatment at a speed of 200r / min for 2 hours, and then place the product under argon Under protection, in a box furnace, pretreatment at 300°C for 4 hours at a heating rate of 8°C / min, and natural cooling to obtain the pretreated powder, which is the precursor of lithium manganese phosphate.

[0053...

Embodiment 2

[0056] Example 2, the raw materials lithium hydroxide and manganese acetate were ball milled to submicron size, and 88.29 grams of lithium hydroxide, 468.8 grams of manganese acetate, 220.52 grams of phosphoric acid and 126.4 grams of glucose were accurately weighed. Glucose was dissolved in 1500 ml of deionized water at 90°C, and stirred at constant temperature for 0.5 hours; lithium hydroxide and manganese acetate were added to the above solution in turn, and finally phosphoric acid was added, and stirred at a speed of 150 r / min for 2 hours.

[0057] The above sample was mixed with 2wt.% Al 2 o 3 After mixing, ball mill at a speed of 400r / min for 1 hour, spray dry and granulate at 360°C, and perform fusion treatment at a speed of 600r / min for 1 hour, then place the product in a tube furnace under the protection of argon, Pretreatment was performed at 350°C for 4 hours at a heating rate of 1°C / min, and pretreated powder was obtained after natural cooling.

[0058] The obtai...

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Abstract

The invention discloses a manganese/lithium phosphate of lithium iron battery positive pole material and a production method thereof, the technical issue to be solved is to improve electrochemical performances of the positive pole material. The material of the invention includes substrates of manganese/lithium phosphate which are covered by a carbon material covering layer, the lithium covering the manganese/lithium phosphate behind the carbon material covering layer is spherical and has microscopic characteristics of being near spherical, rhombic, tapered, tabular, layered or/and block-shaped as well as of having 0.5-30 mum long and short axles. The production method comprises the following steps of: production of nanometer particles, liquid phase mixed reaction, production of precursor, sintering treatment, covering organic substances. Compared with the prior art, the invention improves the electron conductivity of the manganese/lithium phosphate by covering with carbon liquid phase, the carbon sufficiently covers active materials to efficiently prevent particle aggregation, the invention has the characteristics of about 4V of discharge voltage, high discharge and charge capacitance, excellent circulation stability, high safety, simple process, low cost and little influence on the environment.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and a preparation method thereof, in particular to a lithium manganese phosphate material and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of high energy density, long cycle life and low self-discharge rate. Since Sony successfully realized the commercial production of lithium-ion secondary batteries in the 1990s, lithium-ion batteries have been widely used in various portable In terms of electronic products and mobile tools, it also has great application prospects in electric vehicle EV and hybrid electric vehicle HEV power supply. At present, the anode materials of lithium-ion batteries mainly include lithium cobalt oxide, lithium manganese oxide, ternary materials and lithium iron phosphate. Lithium cobalt oxide was first used as a cathode material for lithium-ion batteries, and the technology is mature. However, cobalt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01B25/45
CPCY02E60/10
Inventor 岳敏侯春平贺雪琴张万红
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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