Positive pole material with nuclear shell structure for lithium battery, and preparation method and application thereof

A positive electrode material and core-shell structure technology, applied in the field of electrochemistry, can solve the problems of high manufacturing cost, uneasy control of conditions, increased energy consumption, etc., achieve high specific capacity and rate performance, increase diffusion rate, and expand diffusion path Effect

Inactive Publication Date: 2011-08-31
SICHUAN SIMEI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the conditions of these methods are not easy to control, the manufacturing cost is quite high
At present, the industrial production of such compounds adopts wet methods, which must be dried before sintering, which greatly increases energy consumption.

Method used

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  • Positive pole material with nuclear shell structure for lithium battery, and preparation method and application thereof
  • Positive pole material with nuclear shell structure for lithium battery, and preparation method and application thereof
  • Positive pole material with nuclear shell structure for lithium battery, and preparation method and application thereof

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preparation example Construction

[0027] The above-mentioned preparation method of the lithium battery positive electrode material having a core-shell structure includes the following steps: A. Weigh iron phosphate, metal phosphate, lithium compound and ball milling aid according to the molar ratio, and use dry ball milling to obtain a reaction precursor. The metal element contained in the metal phosphate is one of iron, cobalt, nickel, manganese, vanadium, niobium, zirconium, and titanium; B. The reaction precursor is kept at a constant temperature of 500-900°C in the presence of an inert gas Calcined for 5 to 30 hours to obtain the general formula Li x Fe y PO 4 z(Li a m b PO 4 ), wherein 0.9≤x<1.0, 0.9≤y<1.0, 0

[0028] A lithium battery, characterized in that: the positive electrode material of the lithium battery has the following general formula: Li x Fe y PO 4 z(Li a m b PO 4 ). Among them, the nuclear material has the general formula Li x Fe y PO 4 , 0.9≤...

Embodiment 1

[0032] Put 100kg of iron phosphate, 24.5kg of lithium carbonate, and 8kg of starch in a ball mill, and dry grind for 8 hours to thoroughly grind and disperse, then place the precursor in an alumina crucible, and put it in an inert atmosphere furnace. The temperature was raised to 700°C at a rate of 20°C / min, and the heat treatment was performed for 24 hours. Preparation of lithium iron phosphate-based lithium battery cathode material LiFe with core-shell structure 0.99 PO 4 0.05(Li 1.2 Fe 1.2 PO 4 ). Granularity is D 50 =1.5μm, the specific surface area is 14.8m 2 / g, the discharge capacity of the material for the first time powder mixing can reach about 143mAh / g.

Embodiment 2

[0034] Put 100kg of iron phosphate, 3kg of manganese phosphate, 25kg of lithium carbonate, and 8kg of starch in a ball mill jar, dry grind for 8 hours, grind and disperse thoroughly, then put the precursor in an alumina crucible, and put it in an inert atmosphere furnace , the furnace was heated up to 700°C at a rate of 20°C / min, and heat treated for 24 hours. Preparation of lithium iron phosphate-based lithium battery cathode material LiFe with core-shell structure 0.99 PO 4 0.025 (Li 1.2 mn 1.2 PO 4 ). Granularity is D 50 =1.6μm, the specific surface area is 14.2m 2 / g, the discharge capacity of the material for the first time powder mixing can reach about 141mAh / g.

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Abstract

The invention discloses a positive pole material with a nuclear shell structure for a lithium battery, and a preparation method thereof. The positive pole material with a nuclear shell structure for a lithium battery has the general formula of LixFeyPO4.z(LiaMbPO4), wherein the nuclear material has the general formula of LixFeyPO4, wherein x is not less than 0.9 and less than 1.0, and y is not less than 0.9 and less than 1.0; the shell material has the general formula of LiaMbPO4, wherein a is not less than 1.15 and not larger than 1.25, and b is not less than 1.15 and not larger than 1.25; M is selected from one of ferrum, cobalt, nickel, manganese, vanadium, niobium, zirconium and titanium; and z is larger than 0 and not larger than 0.3. The invention further discloses a preparation method of the positive pole material with the nuclear shell structure for the lithium battery, which adopts the production technology of dry mixing without the process of drying; therefore, the energy in industrial production can be effectively saved compared with the prior art.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a lithium battery anode material with a core-shell structure and a preparation method and application thereof. Background technique [0002] It is known that the olivine structure of alkali metal group ionic compounds has poor overall ion diffusivity and electron conductivity due to structural constraints. In order to improve these poor conductivity problems, a common practice is to miniaturize the material or dope other metal atoms to lower the molecular energy level. Since the conditions of these methods are not easy to control, the manufacturing cost is quite high. At present, wet methods are used to manufacture such compounds in industry, and they must be dried before sintering, which greatly increases energy consumption. Contents of the invention [0003] The object of the present invention is to overcome the deficiencies of the prior art, and propose a lithium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397H01M10/052
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 徐厚宝何光明
Owner SICHUAN SIMEI TECH
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