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LiMn1-XFexPO4 positive electrode material having core-shell structure, and preparation method thereof, and lithium ion battery

A core-shell structure and cathode material technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve problems such as the influence of material weight ratio to energy, and the unsatisfactory effect of carbon coating on the surface.

Inactive Publication Date: 2016-10-26
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, studies have shown that, compared with lithium iron phosphate, in LiMn 1-x Fe x PO 4 The effect of carbon coating on the surface is not ideal, and it is difficult to coat LiMn with a single carbon coating. 1-x Fe x PO 4 A uniform coating layer is formed on the surface. The usual method is to increase the content of coating carbon to ensure the coating effect. However, the weight specific energy of the material will be greatly affected.

Method used

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  • LiMn1-XFexPO4 positive electrode material having core-shell structure, and preparation method thereof, and lithium ion battery
  • LiMn1-XFexPO4 positive electrode material having core-shell structure, and preparation method thereof, and lithium ion battery
  • LiMn1-XFexPO4 positive electrode material having core-shell structure, and preparation method thereof, and lithium ion battery

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preparation example Construction

[0030] The present invention also provides a kind of above-mentioned core-shell structure LiMn 1-x Fe x PO 4 A method for preparing a positive electrode material, comprising the following steps: S1) adding a first lithium source compound, a metal source compound, a first phosphorus source compound, LiMn 1-x Fe x PO 4 Mix the nanoparticles, the first complexing agent, and the soluble carbon source with water, and heat until the water evaporates to dryness to obtain an intermediate; 0<x<0.5; S2) Calcining the intermediate to obtain a core-shell structure positive electrode material.

[0031] Wherein, the present invention has no special limitation on the sources of all raw materials, which may be commercially available or self-made.

[0032] In the present invention, the LiMn 1-x Fe x PO 4 The nanoparticles are preferably prepared according to the following method: A) mixing the second lithium source compound, the manganese source compound, the iron source compound, the s...

Embodiment 1

[0055] LiMn 0.8 Fe 0.2 PO 4 Synthesis of: Li 2 CO 3 , Mn(Ac) 2 , FeC 2 o 4 , NH 4 h 2 PO 4 According to LiMn 0.8 Fe 0.2 PO 4 The medium stoichiometric ratio is dissolved in deionized water, and the mass added is to obtain the theoretical product LiMn 0.8 Fe 0.2 PO 4 5% citric acid by mass is used as a complexing agent, heated and stirred in a water bath at 80°C for 8-12h, until the water is evaporated to dryness, and the obtained product is vacuum-dried at 80°C and -0.98MPa for 24h. After drying, put the product in a tube furnace, raise the temperature to 450°C at a rate of 5°C / min, keep it for 8 hours, then raise it to 750°C at a rate of 5°C / min, keep it for 12 hours, and get LiMn after cooling. 0.8 Fe 0.2 PO 4 .

[0056] LiFeP 2 o 7 / C co-coated nano-LiMn 0.8 Fe 0.2 PO 4 Synthesis of : 1mol Li 2 CO 3 , 2mol FeC 2 o 4 , 2mol NH 4 h 2 PO 4 Dissolve in deionized water, add 25mol LiMn 0.8 Fe 0.2 PO 4 , mass are LiMn 0.8 Fe 0.2 PO 4 5% citric a...

Embodiment 2

[0060] LiMn 0.8 Fe 0.2 PO 4 Synthesis of: according to LiMn in Example 1 0.8 Fe 0.2 PO 4 synthetic method for synthesis.

[0061] LiFeP 2 o 7 / C co-coated nano-LiMn 0.8 Fe 0.2 PO 4 Synthesis of : 2mol Li 2 CO 3 , 4mol FeC 2 o 4 , 4mol NH 4 h 2 PO 4 Dissolve in deionized water, add 25mol LiMn 0.8 Fe 0.2 PO 4 , mass are LiMn 0.8 Fe 0.2 PO 4 5% by mass of citric acid complexing agent and 10% of glucose were heated and stirred in a water bath at 80° C. for 8-12 hours until the water was evaporated to dryness. The obtained product was vacuum-dried at 80°C and -0.98MPa. After drying, the product is placed in a tube furnace, and the temperature is raised to 600°C at a heating rate of 5°C / min, kept for 2 to 5 hours, and LiFeP is obtained after cooling. 2 o 7 / C co-modified nano-LiMn 0.8 Fe 0.2 PO 4 .

[0062] With the core-shell structure cathode material prepared in embodiment 2 i.e. LiFeP 2 o 7 / C co-coated nano-LiMn 0.8 Fe 0.2 PO 4 As a positive el...

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Abstract

The invention provides a core-shell structure positive electrode material, which comprises an inner core and a shell, wherein the inner core is LiMn1-XFexPO4 nanoparticles, the shell is a mixture of carbon and a lithium-containing metal salt, the lithium-containing metal salt is a lithium-containing metal phosphate and / or lithium-containing metal pyrophosphate, and x is more than 0 and is less than 0.5. According to the present invention, the LiMn1-XFexPO4 nanoparticles are adopted as the inner core, wherein the lithium ion diffusion path can be shortened, the time of the diffusion of the lithium ions among the particles can be reduced, and the material ion transmission performance can be improved with the nano-treatment of the material; and the mixture of the carbon and the lithium-containing metal phosphate and / or lithium-containing metal pyrophosphate is adopted as the coating layer, wherein the conductivity of the material ions can be increased and the carbon coating effect is effectively improved with the addition of the lithium-containing metal phosphate and / or lithium-containing metal pyrophosphate, such that the rate performance and the cycle performance of the core-shell structure positive electrode material are significantly improved, and the high compaction density is provided.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a core-shell structure LiMn 1-x Fe x PO 4 Cathode material and its preparation method, lithium ion battery. Background technique [0002] In recent years, environmentally friendly lithium-ion secondary batteries have been widely used in various portable electronic products and communication tools, and are gradually being developed as power sources for electric vehicles. Among them, the development of new electrode materials, especially cathode materials, is crucial. [0003] At present, the cathode materials used in lithium-ion batteries are mainly lithium-intercalated transition metal oxides, including layered LiMO 2 (M=Co, Ni, Mn) and spinel LiMn 2 o 4 , but due to the price, safety, electrochemical performance and other reasons of these materials, their application in high-capacity batteries is restricted. LiFePO was first reported by A.K.Padhi in 1997 4 ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/624H01M4/625H01M10/0525H01M4/36H01M4/58H01M4/62Y02E60/10
Inventor 高文超潘芳芳肖亚洲
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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