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Lithium-ion battery cathode material lithium iron phosphate and preparation method thereof

A technology for lithium ion batteries and positive electrode materials, applied in the field of lithium ion battery positive electrode materials and their preparation, can solve the problems of complex process operation steps, irreversible capacity loss, pollution caused by the environment, etc., so as to improve the cycle performance and speed up the kinetics of lithium storage. , the effect of high production efficiency

Active Publication Date: 2015-12-02
CHANGSHA RES INST OF MINING & METALLURGY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nano-lithium iron phosphate is an important way to improve the diffusion rate of lithium ions, but there are still many problems to be studied in the preparation method of nano-lithium iron phosphate electrode materials mentioned above: (1) How to ensure the quality of different production batches Stability; (2) The problem of irreversible capacity loss caused by severe agglomeration of lithium iron phosphate nanomaterials in the process of charging and discharging; (3) How to choose a suitable preparation method to ensure that the nanoparticle size of lithium iron phosphate materials is improved under the premise of The degree of crystallization of the electrode to obtain a stable working voltage of the battery; (4) How to improve the tap density of the lithium iron phosphate battery
In addition, the above-mentioned preparation method of nano-lithium ferrous phosphate is difficult to industrialize, the process operation steps are complicated, and the cost is high. The chemical raw materials such as organic solvents used in the process are likely to pollute the environment, and the environmental protection of the process needs to be further improved. improve

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  • Lithium-ion battery cathode material lithium iron phosphate and preparation method thereof
  • Lithium-ion battery cathode material lithium iron phosphate and preparation method thereof
  • Lithium-ion battery cathode material lithium iron phosphate and preparation method thereof

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Embodiment 1

[0038] a kind of like figure 1 Lithium-ion battery cathode material LiFePO shown in the present invention 4 , the lithium-ion battery cathode material LiFePO 4 the D 50 At 1.86μm, specific surface area at 19.25m 2 / g, tap density 1.54g / cm 3 .

[0039] Lithium-ion battery cathode material LiFePO of the present embodiment 4 It is prepared by using iron phosphate as a raw material with a nano-ceramic grinding and dispersing machine, and specifically includes the following steps:

[0040] (1) Raw material preparation: purchase iron phosphate (iron source and phosphorus source), lithium hydroxide and glucose as raw materials; according to LiFePO 4The molecular formula is used for batching; the dosage of glucose is calculated according to 6% of the theoretical carbon content; considering the burning loss of lithium source and phosphorus source in the sintering process, a small amount of surplus is required for lithium source and phosphorus source, so lithium source and iron so...

Embodiment 2

[0046] a kind of like figure 2 Lithium-ion battery cathode material LiFePO shown in the present invention 4 , the lithium-ion battery cathode material LiFePO 4 the D 50 At 5.3μm, specific surface area at 15.74m 2 / g, tap density 1.55g / cm 3 .

[0047] Lithium-ion battery cathode material LiFePO of the present embodiment 4 It is prepared by using iron phosphate as a raw material with a nano-ceramic grinding and dispersing machine, and specifically includes the following steps:

[0048] (1) Raw material preparation: purchase iron phosphate (iron source and phosphorus source), lithium hydroxide and glucose as raw materials; according to LiFePO 4 The molecular formula is used for batching; the dosage of glucose is calculated according to 6% of the theoretical carbon content; considering the burning loss of lithium source and phosphorus source in the sintering process, a small amount of surplus is required for lithium source and phosphorus source, so lithium source and iron s...

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Abstract

The invention discloses a preparation method for a lithium ion battery positive material LiFePO4 with iron phosphate as a raw material by utilization of nano-ceramic grinding and dispersion machine. The method comprises steps: first, lithium source, ferric phosphate and carbon source as raw materials are prepared; the raw materials are ground into nano level by a nano-ceramic grinding and dispersion machine; after desiccation, the obtained mixed material is subjected to once sintering and secondary sintering, the lithium ion battery positive material LiFePO4 is obtained. The prepared LiFePO4 has a particle size D50 of 1-6 microns, has a specific surface area of 15-25 m<2> / g, and has a tap density of being more than or equal to 1.5g / cm<3>. The process is simple and easy to control. The production cost is low. The obtained product has uniform ingredients and good physical and chemical properties and electrical properties.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion battery and its preparation, in particular to a lithium ferrous phosphate prepared by using a nano ceramic grinding and dispersing machine with iron phosphate as a raw material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become an ideal power source for portable electronic products due to their high specific energy, low self-discharge, light weight, and environmental friendliness, as well as the preferred power source for future electric vehicles and hybrid electric vehicles. Therefore, lithium-ion batteries and related materials have become one of the research hotspots of researchers all over the world (see ZhangSS, Read JA. A new direction for the performance improvement of rechargeable lithium / sulfur batteries [J]. Journal of Power Sources, 2012, 200: 77-82; .Recent progress in cathode materials research for advanced lithium ion bat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/45
CPCC01B25/45H01M4/5825H01M10/0525Y02E60/10
Inventor 廖达前周春仙习小明覃事彪
Owner CHANGSHA RES INST OF MINING & METALLURGY
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