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Low-temperature hydrothermally synthesized organic phosphonic acid lithium battery anode material LixMmR(PO3)n

A technology of organic phosphonic acid and hydrothermal synthesis, which is applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of lack of controllable composition and structure design, and achieve the effects of optimized charge and discharge performance, low cost, and high product yield

Inactive Publication Date: 2010-06-16
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the synthesis of the above-mentioned materials is basically carried out by solid-state reaction under high temperature and high pressure conditions, and the composition and structure design of the materials lacks controllability.

Method used

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  • Low-temperature hydrothermally synthesized organic phosphonic acid lithium battery anode material LixMmR(PO3)n
  • Low-temperature hydrothermally synthesized organic phosphonic acid lithium battery anode material LixMmR(PO3)n
  • Low-temperature hydrothermally synthesized organic phosphonic acid lithium battery anode material LixMmR(PO3)n

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1, Li 2 [Rh 2 (CH 3 C(OH)(PO 3 h 0.5 ) 2 ) 2 ]·4H 2 Synthesis of O

[0023] RhCl 3 ·3H 2 O 2.5723g (9.77mmol), 1-hydroxyethyl diphosphonic acid CH 3 C(OH)(PO 3 h 2 ) 2 ·H 2 O6.5654g (29.30mmol) mixed with 40mL of water, 1M LiOH to adjust the pH of the solution to 3.30, stirred at room temperature for 2 hours, put the solution into a polytetrafluoroethylene-lined reactor and sealed, heated to 140°C by program, and reacted at constant temperature for 3 Day, program cooling to room temperature, filtration, deionized water, ethanol, acetone washing, vacuum drying to obtain pure green needle-like crystals 3.2673g, yield 95.9% (based on Rh). Chemical formula C 4 h 18 o 18 P 4 Li 2 Rh 2 , elemental analysis (%) calculated value: C, 6.88; H, 2.60; measured value: C: 5.70; H, 2.56.

[0024] Infrared spectrum IR (KBr, cm -1 ): 3508(s), 3419(br,s), 3216(br,s), 2947(m), 1655(s), 1457(m), 1370(s), 1155(vs), 1135(vs) , 1072(vs), 1016(vs), 971(vs), 927(v...

Embodiment 2

[0028] Example 2, Li 3 [Ru 2 (CH 3 C(OH)(PO 3 ) 2 ) 2 ]·2H 2 Synthesis of O

[0029] RuCl 3 3.5H 2 O 0.1015g (0.38mmol), 1-hydroxyethyl diphosphonic acid CH 3 C(OH)(PO 3 h 2 ) 2 ·H 2 O0.3367g (1.50mmol) was mixed in 4mL water, adjusted to pH = 4.70 with 1M LiOH, the mixture was put into a stainless steel reactor lined with polytetrafluoroethylene, the temperature was raised to 160°C, and the temperature was reacted for 4 days, and the temperature was lowered to room temperature, filtered, washed with deionized water, ethanol, and acetone, and dried in vacuum to obtain 0.120 g of reddish-brown fibrous crystals with a yield of 95% (based on Ru). Chemical formula C 4 h 12 o 16 P 4 Li 3 Ru 2 Elemental analysis (%) Found value: C, 7.10; H, 1.95; Theoretical value: C, 7.25; H, 1.82%.

[0030] Infrared spectrum IR (KBr, cm -1 ): 3418(s), 1647(s), 1457(w), 1370(w), 1144(s), 1067(m), 975(s), 915(m), 819(w), 587(s ), 492(m).

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Abstract

The invention relates to a low-temperature hydrothermally synthesized organic phosphonic acid lithium battery anode material, and discloses a novel metal organic phosphonic acid lithium coordination compound with a composition of LixMmR(PO3)n (wherein R=an organic group, and M=a transition metal ion) as the lithium battery anode material, and the regulation and control of the composition structure of the material can be realized through changing the organic group R to optimize the deinsertion of a lithium ion in the anode material. A preparation method adopts a low-cost low-temperature low-pressure hydrothermal synthesis technology and has high yield and high purity. A phosphonic acid lithium-rhodium complex with a three-dimensional channel structure is obtained. The discharge capacity of the material for the first time reaches 82.73mAh / g, and the specific capacity is still kept at about 82mAh / g after charge and discharge for 20 times and hardly descends, which indicates that the material synthesized by the method has better charge and discharge stability.

Description

technical field [0001] The invention relates to the field of energy materials, in particular to the structural composition and preparation method of a novel lithium-ion battery positive electrode material. Background technique [0002] Cathode material is one of the core components of lithium-ion batteries. Common positive active materials except transition metal oxide LiCoO 2 , LiNiO 2 , LiMn 2 o 4 , Li 4 mn 5 o 12 and its dopants, a class based on LiFePO 4 The representative inorganic phosphate system LiMPO 4 , Li 3 m 2 (PO 4 ) 3 (Wherein M = Fe, Co, Mn, V, etc.) The research on positive electrode materials has attracted people's attention. However, the synthesis of the above-mentioned materials is basically carried out by solid-state reaction under high temperature and high pressure conditions, and the composition and structure design of the materials is not controllable. At present, the development of society has higher and higher requirements for the worki...

Claims

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Application Information

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IPC IPC(8): H01M4/60H01M4/04
CPCY02E60/12Y02E60/10
Inventor 刘斌郑丽敏
Owner NANJING UNIV
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