Multi-element-doped phosphate positive electrode material and preparation method thereof and lithium-ion battery

A cathode material, phosphate technology, used in battery electrodes, secondary batteries, circuits, etc., can solve problems such as high price, poor safety, and environmental hazards

Active Publication Date: 2016-08-24
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commercialized LiCoO 2 Due to the lack of cobalt resources, high price, poor safety, and harmful to the environment, people are looking for new cathode materials.
[0004] As the positive electrode of lithium-ion batteries, phosphate has the advantages of abundant raw materials, non-toxic and pollution-free, good safety performance and high theoretical capacity, which has attracted the attention of many researchers. However, the electronic conductivity of phosphate positive electrode materials is low, only 10 -11 ~10 -9 s / m, which affects the application of phosphate materials as cathode materials

Method used

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  • Multi-element-doped phosphate positive electrode material and preparation method thereof and lithium-ion battery
  • Multi-element-doped phosphate positive electrode material and preparation method thereof and lithium-ion battery

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preparation example Construction

[0041] The present invention also provides a method for preparing a multi-element doped phosphate positive electrode material, comprising the following steps:

[0042] A) sintering after mixing the lithium salt and the phosphate precursor to obtain an intermediate;

[0043] B) sintering the intermediate and the doping precursor after mixing to obtain a multi-element doped phosphate positive electrode material having the chemical formula shown in Formula 1;

[0044] The doping precursor includes one or more of transition metal nitrides, transition metal sulfides, aluminum nitride and aluminum sulfide;

[0045] Li x A a m b PO y N n S m Formula 1;

[0046] In Formula 1, A is one or more of Ti, Zr, Al, V, Cr and W; M is one or more of Fe, Co, Mn and Ni;

[0047] 0.8≤x≤1.2; 0≤a≤0.1; 0

[0048] In the present invention, the lithium salt, the iron-containing compound and the phosphate precursor are prefe...

Embodiment 1

[0056] Embodiment 1 prepares LiFe 0.985 Ti 0.01 PO 3.985 N 0.01

[0057] Will Li 2 CO 3 , FeC 2 o 4 2H 2 O and NH 4 h 2 PO 4 Weigh it according to the stoichiometric ratio of molar ratio Li:Fe:P=1:0.985:1, grind it in an agate mortar for 1h, mix well; then pretreat at 300°C for 12h under argon protection, and cool naturally; TiN and the pretreated product were mixed at a molar ratio of Li:Fe:Ti:P=1:0.985:0.01:1, then ground in an agate mortar for 30 minutes, and mixed evenly; finally, they were sintered at 650°C under the protection of argon for 12 Hours, natural cooling, obtain multi-element doped lithium-ion battery phosphate cathode material LiFe 0.985 Ti 0.01 PO 3.985 N 0.01 .

[0058] After testing, the positive electrode material LiFe in this embodiment 0.985 Ti 0.01 PO 3.985 N 0.01 The electronic conductivity of

Embodiment 2

[0059] Embodiment 2 prepares LiFe 0.97 Cr 0.02 PO 3.97 N 0.02

[0060] LiF, FeC 2 o 4 2H 2 O and NH 4 h 2 PO 4 Weigh it according to the stoichiometric ratio of molar ratio Li:Fe:P=1:0.97:1, grind it in an agate mortar for 1h, and mix well; CrN and the pretreated product were mixed in a molar ratio Li:Fe:Cr:P=1:0.97:0.02:1, then ground in an agate mortar for 30min, and mixed evenly; finally, sintered at 700°C under the protection of argon for 8 Hours, natural cooling, obtain multi-element doped lithium-ion battery phosphate cathode material LiFe 0.97 Cr 0.02 PO 3.97 N 0.02 .

[0061] The material is listed in Table 1 as the charge and discharge test results of the positive electrode of the lithium ion battery.

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Abstract

The invention provides a multi-element-doped phosphate positive electrode material and a preparation method thereof and a lithium-ion battery. The material has a chemical formula as shown in the formula 1: LixAaMbPOyNnSm; in the formula 1, A is one or more of Ti, Zr, Al, V, Cr and W; M is one or more of Fe, Co, Mn and Ni; x is smaller than or equal to 1.2 and greater than or equal to 0.8; a is smaller than or equal to 0.1 and greater than or equal to 0; b is smaller than or equal to 1.1 and greater than or equal to 0; y is smaller than or equal to 4 and greater than or equal to 3; n is smaller than or equal to 0.2 and greater than or equal to 0; and m is smaller than or equal to 0.2 and greater than or equal to 0. Transition metal cations are doped into the positions of metal elements and a nitrogen element or a sulfur element is doped into an oxygen position at the same time, so that cell parameters of the phosphate positive electrode material can be changed; the transmission speed of lithium ions in crystal lattices is improved; the ionic conductivity is improved; meanwhile, the electron structure of phosphate can be changed; and the electronic conductivity is improved. An experiment result shows that the electronic conductivity of the multi-element-doped phosphate positive electrode material is 10<-6> to 10<-4>s/m.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a multi-element doped phosphate cathode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Due to the advantages of high energy density and discharge voltage, small self-discharge, no memory effect, and long cycle life, lithium-ion batteries have developed rapidly since the commercialization of lithium-ion batteries, and quickly occupied the portable electronic product market. At the same time, transportation, energy, military and other departments are also looking forward to lithium-ion batteries with better performance. Therefore, lithium-ion batteries contain huge business opportunities, especially in power batteries and large energy storage batteries. [0003] The key materials of lithium-ion batteries include positive and negative electrodes, separators and electrolytes, etc. Among them, the development ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCH01M4/362H01M4/5825H01M10/0525Y02E60/10
Inventor 徐凯琪苏伟魏增福钟国彬王超
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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