Novel lithium iron phosphate anode material used for lithium ion battery and method of manufacturing the same

A lithium-ion battery, lithium iron phosphate technology, applied in the direction of electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve the problems that cannot meet the specific capacity and cycle performance requirements of high-rate charge-discharge batteries, and achieve good battery cycles Performance, broad application prospects, effects from a wide range of sources

Active Publication Date: 2009-02-18
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the materials obtained by these methods still cannot meet the specific capacity and cycle performance requirements of high-rate charge-discharge batteries.

Method used

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  • Novel lithium iron phosphate anode material used for lithium ion battery and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Mix 3 moles of lithium fluoride, 2.94 moles of ferrous oxalate, 2.94 moles of ammonium dihydrogen phosphate, and 0.03 moles of sodium thiosulfate, add 1000ml of deionized water and 30ml of industrial alcohol, seal and ball mill (600-800r / min) for 8 hours , the discharge was dried at 100°C and then ball-milled (700r / min) for 4 hours. Under nitrogen protection, the temperature was raised to 360°C at a rate of 2°C / min. / min) mixed for 4 hours, after briquetting, the temperature was raised to 700°C at a rate of 3°C / min under the protection of nitrogen, kept at this temperature for 10 hours, and then dropped to room temperature with the furnace temperature, and after shape shaping, LiFe 0.98 Na 0.02 P 0.98 S 0.02 o 4 Lithium iron phosphate powder positive electrode material, denoted as sample A.

[0038] The electrochemical performance of gained sample is measured by following method, takes by weighing 100g sample A (LiFe 0.98 Na 0.02 P 0.98 S 0.02 o 4 ) lithium iro...

Embodiment 2

[0040] 3 moles of lithium fluoride, 2.94 moles of ferrous oxalate, 2.94 moles of ammonium dihydrogen phosphate and 0.03 moles of potassium thiosulfate were mixed, and the rest of the steps were the same as in Example 1 to obtain LiFe 0.98 K 0.02 P 0.98 S 0.02 o 4 Lithium iron phosphate powder, denoted as sample B.

[0041] According to the method of Example 1, use sample B to make a battery pole piece and measure the resistance of the positive pole piece; assemble a battery and measure the internal resistance of the battery, charge to 4.0V at a rate of 5C, and discharge to 2.0V to obtain the third cycle discharge ratio of the battery The capacity is 113mAh / g, and the specific capacity after 30 cycles of discharge is 111mAh / g, see the simulation battery test table.

Embodiment 3

[0043] 3 moles of lithium fluoride, 2.88 moles of ferrous oxalate, 2.88 moles of ammonium dihydrogen phosphate and 0.06 moles of sodium thiosulfate were mixed, and the remaining steps were the same as in Example 1 to obtain LiFe 0.96 Na 0.04 P 0.96 S 0.04 o 4 Lithium iron phosphate powder, denoted as sample C.

[0044] According to the method of Example 1, use sample C to make battery pole pieces and measure the resistance of the positive pole piece; assemble the battery and measure the internal resistance of the battery, charge to 4.0V at a rate of 5C, and discharge to 2.0V to obtain the third cycle discharge ratio of the battery The capacity is 114mAh / g, and the specific capacity after 30 cycles of discharge is 112mAh / g, see the simulation battery test table.

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Abstract

The invention discloses a novel ferric phosphate lithium anode material for lithium battery, the ferric potential and phosphate potential are partly substituted simultaneously, with a molecular formula of LiFe<1-x>M<x>P<1-y>S<y>O<4>, M represents sodium element or potassium element, S represents sulfur element, 0<x<=0.5, 0<y<=0.5. The invention also discloses preparation method of the anode material. With the ferric potential, phosphate potential being substituted simultaneously, the ferric phosphate lithium anode material has charge and discharge capacity of high multiplying power and excellent battery circulation performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a novel lithium iron phosphate cathode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of green high-energy rechargeable battery that appeared in the early 1990s. It has many advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. Widely used in mobile phones, notebook computers, electronic instruments, portable electric tools, electric bicycles, weapons and equipment, etc. It also has a good application prospect in electric vehicles, and has become the focus of research and development in countries all over the world. [0003] Cathode material is an important part of lithium-ion batteries, and it is also the key to determine the performance of lithium-ion batteries. At present, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01B25/45
CPCY02E60/12Y02E60/10
Inventor 欧阳曦彭忠勇孙鸿飞万里城李啟刘玉萍
Owner SHENZHEN BAK POWER BATTERY CO LTD
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