Rare-earth element samarium-doped modified lithium ion battery anode material and preparation method thereof

A technology for lithium ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems affecting the crystal structure and unit cell parameters of lithium iron phosphate, the electronic conductivity of materials is not significantly improved, and it cannot eliminate lithium ion intercalation migration. It can improve the high-rate discharge performance, strengthen the ion conductivity and electronic conductivity, and inhibit the growth of crystals.

Inactive Publication Date: 2011-05-04
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0005] 1. Although methods such as hydrothermal synthesis, liquid-phase co-precipitation, and sol-gel methods can be used to prepare powder materials with uniform particle size and small particle size, which reduces the migration path of lithium ions, the electronic conductivity of the material The capacity improvement is not obvious, and there are still shortcomings such as high equipment requirements or complicated preparation processes, making it difficult to carry out industrialized mass production;
[0006] 2. Although the lithium iron phosphate produced by doping transition metal elements and carbon coating can simultaneously improve the electronic conductivity of the material and the diffusion rate of lithium ions, it cannot eliminate the presence of trace metal oxides on the grain surface of the material that hinder lithium The problem of ion intercalation and migration, and crystal phase doping will more or less affect the crystal structure and unit cell parameters of lithium iron phosphate, thereby affecting the stability of the material

Method used

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  • Rare-earth element samarium-doped modified lithium ion battery anode material and preparation method thereof
  • Rare-earth element samarium-doped modified lithium ion battery anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The first step is to mix 0.5mol lithium carbonate, 1mol diammonium hydrogen phosphate, 0.495mol ferric oxide, 0.01mol samarium oxide and 12.48g glucose, use absolute alcohol as a dispersant, and mix through high-speed ball mill;

[0026] In the second step, the mixed raw materials are placed in a well-type heating furnace, nitrogen gas is introduced as a protective gas, the temperature is raised to 350°C, and the temperature is kept constant for 10 hours. After cooling, the reaction precursor is obtained by grinding;

[0027] The third step is to put the obtained reaction precursor into the reactor, put it in the pit furnace, pass nitrogen gas as the protective gas, raise the temperature to 700°C, keep the temperature at a constant temperature for 24 hours, and after cooling with the furnace, grind and sieve the obtained powder. LiFe 1-x SM x PO 4 -SmPO 4 / C composite doping modified cathode material. figure 1 It is the LiFe prepared in Example 1 1-x SM x PO 4 -S...

Embodiment 2

[0030] In the first step, 1.02mol of lithium nitrate, 0.04mol of ammonium hydrogen phosphate, 0.96mol of ferric phosphate, 0.05mol of samarium acetate and 49.96g of sucrose are mixed, and ethanol is used as a dispersant, and the mixture is evenly mixed through a high-speed ball mill;

[0031] In the second step, the mixed raw materials are placed in a well-type furnace, and argon is introduced as a protective gas, and the temperature is raised to 250 ° C, and the temperature is kept constant for 10 hours, and the reaction precursor is obtained after cooling and grinding;

[0032] The third step is to put the reaction precursor into the reactor, put it in the pit furnace, pass nitrogen gas as the protective gas, raise the temperature to 800°C, and calcine at constant temperature for 32 hours. After cooling with the furnace, grinding, and sieving, the powder obtained is LiFe 1-x SM x PO 4 -SmPO 4 / C composite doping modified cathode material.

[0033] The above-mentioned comp...

Embodiment 3

[0035] The first step is to mix 1mol lithium phosphate, 0.97mol ferric citrate, 0.04mol samarium hydroxide and 2.49g glucose, use absolute alcohol as a dispersant, and mix by ball milling in a high-speed ball mill;

[0036] In the second step, the mixed raw materials are placed in a well-type heating furnace, nitrogen is introduced as a protective gas, the temperature is raised to 400°C, and the temperature is kept constant for 5 hours, and the reaction precursor is obtained by grinding after cooling;

[0037] The third step is to put the obtained reaction precursor into the reactor, put it in the pit furnace, pass nitrogen gas as the protective gas, raise the temperature to 500°C, keep the temperature for 40 hours, cool down with the furnace, grind and sieve the obtained powder. LiFe 1-x SM x PO 4 -SmPO 4 / C composite doping modified cathode material.

[0038] The above-mentioned composite doped modified positive electrode material is used as a positive electrode active m...

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Abstract

The invention discloses a rare-earth element samarium-doped modified lithium ion battery anode material and a preparation method thereof. The method comprises the following steps of: mixing a lithium source compound, a phosphor source compound, an iron source compound, a crystalline-phase element samarium-doped compound and a carbon source compound, heating at 250-400 DEG C for 5-20h, cooling and grinding to obtain a reaction precursor; and calcining the reaction precursor at 500-800 DEG C for 10-40h, cooling to obtain an LiFe1-xSmxPO4-SmPO4/C (x=0.01-0.04) composite rare-earth element samarium-doped modified lithium ion battery anode material. The invention can effectively control the structure and the grain diameter of the composite doped modified cathode material, improve the electronic conductivity of the material and the dispersion rate of lithium ions as well as the electrochemical performance of the material, also simplify the synthesis process of the material and be convenient for industrial mass production.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, in particular to a rare earth element samarium doped modified lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Since 1997, lithium iron phosphate (LiFePO 4 ) has attracted people's attention because of its stable structure, large discharge specific capacity, good safety performance, wide range of raw materials, and environmental friendliness. The best cathode material for lithium-ion batteries. [0003] However, the low lithium ion migration rate and electron conduction rate of lithium iron phosphate material greatly limit its practical application. Therefore, the current research mainly focuses on how to improve the electronic conductivity and lithium ion conductivity of the material. On the one hand, through process optimization, the grain growth of the material during the synthesis process is controlled to obtain fine grains and a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397
CPCY02E60/10
Inventor 周震涛方蕾蕾
Owner SOUTH CHINA UNIV OF TECH
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