Metal ion doping and carbon coating jointly modified lithium ion battery anode material

A lithium-ion battery, metal ion technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as hindering lithium ion deintercalation, unfavorable charging and discharging process, difficulty in lithium ion diffusion, etc., to improve electronic conductivity and ionic Effect of diffusion coefficient, improving specific capacity of high current discharge and cycle stability

Inactive Publication Date: 2010-07-28
JIANGSU POLYTECHNIC UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two problems with this material: 1. During the deintercalation process, the diffusion of lithium ions is relatively difficult, resulting in faster energy decay and poor cycle stability during high-current discharge; 2. In terms of structure, phosphoric acid PO contained in the olivine structure of iron lithium 4 Regular tetrahedron, which hinders the deintercalation of lithium ions, resulting in low conductivity, which is not conducive to the charge and discharge process under high current

Method used

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  • Metal ion doping and carbon coating jointly modified lithium ion battery anode material

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Experimental program
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Effect test

Embodiment 1

[0017] Analytical reagent LiOH·H 2 O, FePO 4 4H 2 O, Nb 2 o 5 and MgO as raw materials, and then accurately weigh LiOH, FePO according to the molar ratio of 1:1:0.1:0.1 4 , Nb 2 o 5 and MgO, then add expanded graphite with a molar ratio of 0.05 as a reducing agent and carbon source, add an appropriate amount of absolute ethanol as a grinding aid, mix well and place it in a ball mill jar for high-speed ball milling, with a ball-to-material ratio of 6:1. The ball-milled samples were dried at 60°C for 6 hours, and then 2 (The flow rate is 1L / min), heated to 600°C at a heating rate of 10°C / min under protection, kept for 4 hours, and then naturally cooled to room temperature to obtain carbon-coated Li 0.7 Mg 0.1 Nb 0.2 FePO 4 .

[0018] The prepared sample, activated carbon and polytetrafluoroethylene (PTFE) were mixed evenly according to the mass ratio of 80:15:5, and an appropriate amount of absolute ethanol was added dropwise as a dispersant, and ground for 1 hour. T...

Embodiment 2

[0020] Analytical reagent LiOH·H 2 O, FePO 4 4H 2 O, Nb 2 o 5 and MgO as raw materials, and then accurately weigh LiOH, FePO according to the molar ratio of 1:1:0.1:0.05 4 , Nb 2 o 5 and MgO, then add expanded graphite with a molar ratio of 0.05 as a reducing agent and carbon source, add an appropriate amount of absolute ethanol as a grinding aid, mix well and place it in a ball mill jar for high-speed ball milling, with a ball-to-material ratio of 6:1. The ball-milled samples were dried at 60°C for 6 hours, and then 2 (The flow rate is 1L / min), heated to 600°C at a heating rate of 10°C / min under protection, kept for 4 hours, and then naturally cooled to room temperature to obtain carbon-coated Li 0.7 Mg 0.1 Nb 0.2 FePO 4 . The preparation method of electrode is identical with embodiment 1, Li 0.7 Mg 0.1 Nb 0.2FePO 4 The charge and discharge capacities of the electrodes under the conditions of 0.5C, 1C and 10C are shown in Table 1, respectively.

Embodiment 3

[0022] Analytical reagent LiOH·H 2 O, FePO 4 4H 2 O, Nb 2 o 5 and MgO as raw materials, and then accurately weigh LiOH, FePO according to the molar ratio of 1:1:0.1:0.2 4 , Nb 2 o 5 and MgO, then add expanded graphite with a molar ratio of 0.05 as a reducing agent and carbon source, add an appropriate amount of absolute ethanol as a grinding aid, mix well and place it in a ball mill jar for high-speed ball milling, with a ball-to-material ratio of 6:1. The ball-milled samples were dried at 60°C for 6 hours, and then 2 (The flow rate is 1L / min), heated to 600°C at a heating rate of 10°C / min under protection, kept for 4 hours, and then naturally cooled to room temperature to obtain carbon-coated Li 0.6 Mg 0.2 Nb 0.2 FePO 4 . The preparation method of electrode is identical with embodiment 1, Li 0.6 Mg 0.2 Nb 0.2 FePO 4 The charge and discharge capacities of the electrodes under the conditions of 0.5C, 1C and 10C are shown in Table 1, respectively.

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Abstract

The invention relates to a battery anode material and discloses a metal ion doping and carbon coating jointly modified lithium ion battery anode material, which comprises a lithium iron phosphate anode substrate synthesized by using LiOH.H2O and FePO4.4H2O, and is characterized in that: the lithium iron phosphate anode substrate contains at least one metal ion which may be Mn<2+>, Ni<2+>, Co<3+>, Cu<2+>, Zn<2+>, Zr<4+>, Al<3+>, Sn<4+>, Nb<5+>, Mg<2+> or Ti<4+>; and the surface of the lithium iron phosphate anode substrate is uniformly coated with carbon. In the lithium ion battery anode material, the metal ion is doped at the lithium position to produce a lithium ion vacancy in the crystal lattice of the lithium iron phosphate, so the electron conductivity and ionic diffusion coefficient of the lithium ion battery anode material are improved and the discharge capacity and the circulation stability of the lithium ion battery anode material are improved. The method for manufacturing metal ion doping and carbon coating jointly modified lithium ion battery anode material is simple, easy to implement, obvious in effect and low in cost.

Description

technical field [0001] The invention relates to a battery positive electrode material, in particular to a modified lithium ion battery positive electrode material which improves electron conductivity and ion diffusion coefficient. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, high power, long service life, and good safety performance. They have been widely used in portable devices such as mobile phones, cameras, and notebook computers, and have shown good application prospects in the field of electric vehicles. , has received increasing attention. [0003] The development of new cathode materials with low cost, high specific energy, environmental friendliness and long life has become the mainstream research direction of lithium-ion batteries. The cathode materials of lithium-ion batteries mainly include lithium cobaltate, lithium manganese oxide and lithium iron phosphate; Compared with other lithium-ion battery cathode mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/58H01M4/1397
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 陈智栋许娟曹剑瑜王文昌赵彦琦储开荣徐利德
Owner JIANGSU POLYTECHNIC UNIVERSITY
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