Composite doped modified lithium-ion battery anode material and its manufacture method

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of compound doped modified lithium-ion battery positive electrode materials and its preparation, can solve the problem of reducing the volume specific energy and volume specific power of materials, affecting the electrical properties of materials, and reducing the true density of materials, etc. Problems, to achieve the effect of strengthening ion conductivity and electronic conductivity, enhancing electronic conductivity, and improving ion conductivity

Inactive Publication Date: 2009-05-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Although synthetic methods such as hydrothermal synthesis, liquid phase co-precipitation, and sol-gel method can synthesize LiFePO with relatively uniform particle size and smaller particle size 4 Material powder, shortened Li + Diffusion path, but the improvement of the conductivity of the material is not obvious, and the above method also has the disadvantages of high equipment requirements or complicated process, so it is not easy to carry out industrial production
[0005] 2. Using the method of simply doping carbon, the amount of carbon black is more, because the density of carbon black is higher than that of LiFePO 4 is much smaller, which will obviously reduce the true density of the material, thereby also reducing the volume specific energy and volume specific power of the material;
[0006] 3. The process of directly doping metal powder method is prone to metal powder sedimentation, and a top-down concentration gradient appears in the metal powder, so that the metal powder in LiFePO 4 The distribution in the material is uneven, which affects the electrical properties of the material;
[0007] 4. Li(Mn) generated by doping transition metal (M) elements such as manganese or cobalt y Fe 1-y )PO 4 , will reduce the stability of the crystal structure of the material, which will also affect the electrical properties of the material

Method used

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  • Composite doped modified lithium-ion battery anode material and its manufacture method
  • Composite doped modified lithium-ion battery anode material and its manufacture method
  • Composite doped modified lithium-ion battery anode material and its manufacture method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The first step is to mix 1mol lithium nitrate, 1mol phosphoric acid, 0.995mol ferrous acetate, 0.005mol yttrium acetate and 36.0g glucose, use 144.0g ethanol as a dispersant, and mix evenly through high-speed ball milling;

[0028] The second step is to place the mixed raw materials in a well-type furnace, pass through nitrogen as a protection, heat at 250°C for 20 hours, cool and grind to obtain PO 4 3- , Li + , Y 2+ , Fe 2+ and carbon black reaction precursor;

[0029] The third step is to put the reaction precursor into the reactor, place it in a well-type furnace, pass through nitrogen as a protection, and calcinate at 500°C for 10 hours, and then get LiFe after cooling with the furnace. 0.995 Y 0.005 PO 4 / C composite doping modified cathode material.

[0030] Adopt above-mentioned composite doping modification positive electrode material to make positive electrode film as positive electrode active material, the composition of positive electrode film is m 活...

Embodiment 2

[0032] The first step is to mix 0.5mol lithium carbonate, 1mol diammonium hydrogen phosphate, 0.99mol ferrous oxalate, 0.01mol lanthanum acetate and 8.0g epoxy resin, use 162.0g ethanol as a dispersant, and mix evenly through high-speed ball milling;

[0033] The second step is to place the mixed raw materials in a well-type furnace, pass through nitrogen as a protection, heat at 300°C for 10 hours, cool and grind to obtain PO 4 3- , Li + , La 2+ , Fe 2+ and carbon black reaction precursor;

[0034] The third step is to put the reaction precursor into the reactor, place it in a well-type furnace, pass through nitrogen as a protection, calcinate at 650°C for 24 hours, and obtain LiFe after cooling with the furnace. 0.99 La 0.01 PO 4 / C composite doping modified cathode material.

[0035] Adopt above-mentioned composite doping modification positive electrode material to make positive electrode film as positive electrode active material, the composition of positive electro...

Embodiment 3

[0037] The first step is to mix 0.5mol lithium carbonate, 1mol ammonium phosphate, 0.98mol ferrous acetate, 0.02mol neodymium acetate and 18g cellobiose, use 140.0g ethanol as a dispersant, and mix evenly through high-speed ball milling;

[0038] The second step is to place the mixed raw materials in a pit furnace, pass through nitrogen as a protection, heat at 350°C for 5 hours, cool and grind to obtain PO 4 3- , Li + 、Nd 2+ , Fe 2+ and carbon black reaction precursor;

[0039] The third step is to put the reaction precursor into the reactor, place it in a well-type furnace, pass through nitrogen as a protection, and calcinate at 700°C for 30 hours, and then get LiFe after cooling with the furnace. 0.98 Nd 0.02 PO 4 / C composite doping modified cathode material.

[0040] Adopt above-mentioned composite doping modification positive electrode material to make positive electrode film as positive electrode active material, the composition of positive electrode film is m 活...

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Abstract

The disclosed preparation method for anode material of composite doped modified Li-ion cell comprises: mixing the Li-source compound, P-source compound, Fe-source compound, crystal phase doped M (rare earth element) compound and non-crystal phase doped element C to heat for 5-20h at 250-400Deg; cooling, and grinding to obtain the reaction predecessor contained PO43-, Li+, Mn+, Fe2+ and carbon black; calcining for 10-40h at 500-800Deg to cool and obtain the final product. This invention improves material electrochemical property and fit to industrial production.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a composite doped modified lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) is a lithium-ion battery cathode material with an olivine-type crystalline structure. It has outstanding advantages such as large charge-discharge specific capacity, long cycle life, good safety performance, low price, non-toxic and pollution-free, and is considered to be the successor to LiCoO 2 , LiNiO 2 , LiMn 2 o 4 After that, it is the most promising cathode material for lithium-ion batteries, which has broad application prospects. [0003] However, lithium iron phosphate also has some significant disadvantages, mainly because its lithium ion mobility and electronic conductivity are low, and the charging and discharging process is affected by Li + In LiFePO 4 -FePO 4 Controlled by the diffusio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/58C01B25/45C01B31/00B01J19/00H01M4/62
CPCY02E60/12Y02E60/10
Inventor 周震涛谢辉
Owner SOUTH CHINA UNIV OF TECH
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