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Modified lithium manganese phosphate composite anode material and preparation method thereof

A composite positive electrode material, lithium manganese phosphate technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor conductivity and poor rate performance, and achieve high specific capacity, excellent rate performance, and uniform dispersion Effect

Active Publication Date: 2016-04-06
深圳市费特森新能源有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of preparation method of lithium manganese phosphate cathode material modified by sodium vanadium phosphate-carbon composite, to solve the deficiencies of existing lithium manganese phosphate modification technology and the existing lithium manganese phosphate cathode Poor material conductivity and poor rate performance

Method used

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  • Modified lithium manganese phosphate composite anode material and preparation method thereof
  • Modified lithium manganese phosphate composite anode material and preparation method thereof
  • Modified lithium manganese phosphate composite anode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Take 0.1molLiMnPO 4 , 4g glucose, the LiMnPO 4 powder, NH 4 h 2 PO 4 , NaF and V 2 o 5 After weighing according to the mass ratio of the substance as 85:30:45:15, add it into the zirconia ball mill tank together with glucose, the mass ratio of the ball to material is 20:1, add 60ml of absolute ethanol, and pre-grind and mix at 300r / min for 0.5 hours Finally, high-energy ball milling at a speed of 400r / min for 2 hours to obtain a uniformly dispersed precursor mixture;

[0038] Add 50ml of deionized water to the above mixture, and perform high-energy ball milling at a speed of 400r / min for 3 hours, due to NH 4 h 2 PO 4 Dissolving self-adaptive regulation system is weakly acidic, mechanically activated V 2 o 5 Dissolving into gel and heteropoly acidification to obtain the lithium manganese phosphate / vanadium-containing colloidal precursor, placing the colloid in an 80°C blast drying oven for 24 hours, and grinding in a ball mill; the above-mentioned lithium manga...

Embodiment 2

[0040] Take 0.1molLiMnPO 4 , 3g sucrose, LiMnPO 4 powder and NaH 2 PO 4 After weighing according to the mass ratio of 80:20, add sucrose into the zirconia ball mill tank, the mass ratio of ball to material is 20:1, add 50ml of absolute ethanol, and high-energy ball mill at 400r / min for 2 hours to obtain dispersion Uniform precursor mixture; add 100ml deionized water to the above mixture, and LiMnPO 4 V 2 o 5 Quickly add to the above mixture, and high-energy ball milling at a speed of 400r / min for 3 hours to obtain the lithium manganese phosphate / vanadium-containing colloid precursor, dry the colloid in a blast drying oven at 80°C for 36 hours, and grind it by ball milling;

[0041] The above-mentioned lithium manganese phosphate / vanadium-containing colloidal precursor was sintered at 650 °C for 8 hours in a pure argon atmosphere to obtain 0.8LiMnPO 4 0.2Na 3 V 2 (PO 4 ) 3 / C composite material, XRD detects that this material has a two-phase composite structure (seein...

Embodiment 3

[0043] Take 0.1molLiMnPO 4 , 2g polyvinyl alcohol, the LiMnPO 4 powder, 85% concentrated phosphoric acid, V 2 o 5 And disodium edetate, ammonium fluoride by LiMnPO 4 :V 2 o 5 :H 3 PO 4 : EDTA-2Na, NH 4 The molar ratio of F substances is 95:5:10:7.5:15. After weighing, add polyvinyl alcohol into the zirconia ball milling tank. The mass ratio of ball to material is 20:1. After milling and mixing for 0.5 hours, then high-energy ball milling at a speed of 400r / min for 2 hours to obtain a uniformly dispersed precursor mixture; add 50ml of deionized water to the above mixture, 4 Add oxalic acid at a molar ratio of 15:95, and high-energy ball mill at a speed of 400r / min for 2 hours to obtain the lithium manganese phosphate / vanadium-containing colloidal precursor. The colloid is dried in a blast drying oven at 80°C for 20 hours, and ball milled to fineness; The lithium manganese phosphate / vanadium-containing colloidal precursor was sintered at 600 °C for 4 hours in a pure arg...

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Abstract

The invention discloses a modified lithium manganese phosphate composite anode material and a preparation method thereof. The problem that an existing lithium manganese phosphate anode material is poor in conductivity, poor in rate capability and unstable in circulation is solved. The nominal molecular formula of the composite anode material disclosed by the invention is yLiMnPO4.(1-y)Na3V2(PO4)3-xF3x / C, wherein x is greater than or equal to 0 and smaller than or equal to 2; and y is greater than or equal to 0.75 and smaller than 1. The preparation method comprises the following steps: (1) carrying out mechanical activation dispersion of LiMnPO4 powder and modified precursor raw materials; (2) controlling to prepare a lithium manganese phosphate / vanadium-containing colloid precursor; and (3) carrying out a one-step calcination method to prepare a lithium manganese phosphate / sodium (fluoro)phosphate vanadium / carbon composite material. The modified lithium manganese phosphate composite anode material has the beneficial effects that the material is simple in technological process, uniform in dispersion and easy to control, and the synergistically modified LiMnPO4-based composite material is high in specific energy density, good in cycle performance and excellent in rate capability.

Description

technical field [0001] The invention belongs to the technical field of preparation of advanced energy storage materials, and in particular relates to a lithium manganese phosphate cathode material modified by sodium vanadium phosphate-carbon composite and a preparation method thereof. Background technique [0002] Lithium-ion batteries are increasingly favored by the global power battery industry and related industries, and the development of high-performance cathode materials has become one of the important cores of lithium-ion battery industry research. Since LiMnPO 4 Compared with LiFePO 4 Higher voltage platform (4.1VvsLi + / Li), thus, LiMnPO 4 than LiFePO 4 It has a higher theoretical energy density. However, with LiFePO 4 Compared to LiMnPO 4 It has lower lithium ion diffusion coefficient (ionic conductivity) and lower electronic conductivity, resulting in poor reversibility of the material and poor rate performance. Therefore, improving the high-current charge...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 曹雁冰胡国荣彭忠东杜柯张志坚段建国
Owner 深圳市费特森新能源有限责任公司
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