High-conductivity ferrous phosphate lithium cathode material for lithium ion battery and preparation method thereof

A lithium iron phosphate and lithium ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as uneven coating and material conductivity limitation, and achieve improved conductivity, excellent high-rate performance, and reversibility. good effect

Inactive Publication Date: 2012-01-18
中国东方电气集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carbon coated in the currently reported technology is mostly amorphous carbon and the coating is uneven, which limits the improvement of the material conductivity.

Method used

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  • High-conductivity ferrous phosphate lithium cathode material for lithium ion battery and preparation method thereof
  • High-conductivity ferrous phosphate lithium cathode material for lithium ion battery and preparation method thereof
  • High-conductivity ferrous phosphate lithium cathode material for lithium ion battery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Li 2 CO 3 , NH 4 h 2 PO 4 Lithium source, phosphorus source, FeC 2 o 4 and Fe 2 o 3 as iron source and catalyst (where FeC 2 o 4 and Fe 2 o 3 The molar ratio is 20:1). Weigh according to the stoichiometric ratio of Li, Fe, P 1.02:1:1, and weigh 1 mole of NH at the same time 4 h 2 PO 4 After adding 50g of starch and weighing it, dissolve it in a certain amount of deionized water to obtain a slurry with a solid content of 60%. After ball milling for 17 hours at a speed of 300 r / min according to the mass ratio of ball to material 5:1, Stir and dry at 80°C. The dried powder material was dried in a tube furnace under N 2Under protection, the temperature was raised to 700°C at 5°C / min and roasted at a constant temperature for 14 hours, and then slowly cooled to room temperature in the furnace to obtain gray-black LiFePO 4 / C target product.

[0034] The carbon content in the prepared lithium iron phosphate material is 2.5%, the thickness of the carbon film o...

Embodiment 2

[0038] Respectively with LiOH, NH 4 h 2 PO 4 Lithium source, phosphorus source, FeC 2 o 4 and C 10 h 10 Fe is the iron source and catalyst (where FeC 2 o 4 and C 10 h 10 The molar ratio of Fe is 10:1). Weigh according to the stoichiometric ratio of Li, Fe, P 1.05:1:1, and weigh 1 mole of NH at the same time 4 h 2 PO 4 After adding 40g of polyvinyl alcohol and weighing it, dissolve it in a certain amount of alcohol solution to obtain a slurry with a solid content of 70%, and ball mill it at a speed of 400 r / min for 18 hours at a ball-to-material mass ratio of 8:1. After that, it was stirred and dried at 70°C. The dried powder material was dried in a tube furnace under N 2 Under protection, heat up at 5°C / min to 750°C and bake at constant temperature for 15 hours, then slowly cool to room temperature in the furnace to obtain gray-black LiFePO 4 / C target product.

[0039] The carbon content in the prepared lithium iron phosphate material is 2%, the thickness of t...

Embodiment 3

[0041] LiH 2 PO 4 Lithium source, phosphorus source, with Fe 2 o 3 and Ni(OH) 2 For iron source and catalyst. Weigh according to the stoichiometric ratio of Li, Fe, Ni, P 1:0.99:0.01:1, and weigh 1 mole of LiH at the same time 2 PO 4 After adding 50g of polyacrylic acid and weighing it, dissolve it in a certain amount of alcohol solution to obtain a slurry with a solid content of 60%, and ball mill it at a speed of 600 r / min for 10 hours according to the mass ratio of ball to material 10:1. , Stir and dry at 60°C. The dried powder material was dried in a tube furnace under N 2 Under protection, heat up at 5°C / min to 650°C and bake at constant temperature for 18 hours, then slowly cool to room temperature in the furnace to obtain gray-black LiFe 0.99 Ni 0.01 PO 4 / C target product.

[0042] The carbon content in the prepared lithium iron phosphate material is 3%, the thickness of the carbon film on the particle surface is about 4nm, and the degree of graphitization i...

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Abstract

The invention provides a high-conductivity ferrous phosphate lithium cathode material for a lithium ion battery and a preparation method thereof. The material is made from a lithium compound, an iron compound, a phosphorous compound, a carbon compound, and a transition metal compound which serves as a graphite catalyst and a doped element, and has a chemical formula of Li(Fe1-xMx)PO4, wherein x is 0 to 0.1; and M may be a transition metal element Fe, Cr, Ni, Co, Mo or Mn. A clad carbon material is catalyzed by adopting the transition metal compound to increase the graphitizing grade of a high-carbon film, thereby improving the conductivity of the material; and the transition metal element can serve as the doped element at the same time to further improve the intrinsic conductivity of the material.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and a preparation method thereof, in particular to a lithium ion battery cathode lithium ferrous phosphate material with high conductivity and a preparation method thereof. Background technique [0002] In February 1990, Japan's Sony Corporation first introduced the first commercial lithium-ion battery to the market and first proposed the concept of "lithium-ion battery". The battery system uses LiCoO 2 As the positive electrode material, petroleum coke is used as the negative electrode material. Since the carbon material capable of reversibly deintercalating lithium is used as the negative electrode, it not only solves the safety performance and cycle stability of the lithium secondary battery, but also maintains the high voltage of the lithium secondary battery. features. Since then, the research and development of lithium-ion batteries has entered a new era. [0003] LiFePO in olivin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 郑威梁孜王瑨王睿谢皎胡蕴成
Owner 中国东方电气集团有限公司
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