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Preparation method of multilayer shell-core structure lithium ion battery material

A lithium-ion battery and nuclear structure technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of sacrificial material specific capacity, poor rate performance, low specific energy, etc., and achieve loose equipment requirements and high rate performance. , The effect of flat discharge platform

Active Publication Date: 2016-03-23
成都巴莫科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Of which LiFePO 4 The material is the most mature and has been tried on many brands of electric vehicles, but LiFePO 4 The material still has problems such as poor rate performance and low specific energy due to poor conductivity and low voltage platform
The performance of the material can be effectively optimized by doping or coating the material, but the introduction of inactive substances also sacrifices the specific capacity of the material to varying degrees.

Method used

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  • Preparation method of multilayer shell-core structure lithium ion battery material
  • Preparation method of multilayer shell-core structure lithium ion battery material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh MnSO 4 h 2 O, FeCl 2 and deionized water to prepare a manganese (II) sulfate solution and a ferrous chloride solution with a concentration of 2 mol / L.

[0026] Weigh LiH 2 PO 4 1. Deionized water, preparing a lithium dihydrogen phosphate solution with a concentration of 2mol / L;

[0027] Inject 10 L of the above lithium dihydrogen phosphate solution into a 30 L normal-pressure reactor equipped with a stirring and heating device, start stirring and heating, set the stirring speed to 100 rpm, and set the temperature to 90°C. Use a peristaltic pump to inject the above-mentioned manganese sulfate solution into the reactor with a flow rate of mL / min, and stop feeding after 25 minutes; continue to use a peristaltic pump to inject the above-mentioned ferrous chloride solution into the reactor with a flow rate of 100mL / min after 5 minutes. After 25min, stop feeding; after 5min, change to inject manganese sulfate solution, inject 5L manganese sulfate (II) solution and ...

Embodiment 2

[0036] Weigh Co(NO 3 ) 2 6H 2 O, Fe(NO 3 ) 3 9H 2 O, Ni(NO 3 ) 2 6H 2 O and deionized water are respectively configured into 2mol / L cobalt nitrate (II) solution, iron nitrate (III) solution and nickel nitrate (II) solution;

[0037] Weigh LiH 2 PO 4 1. Deionized water, prepare a 2mol / L lithium dihydrogen phosphate solution;

[0038]Inject 6L of lithium dihydrogen phosphate solution into a 30L normal-pressure reactor equipped with a stirring and heating device, start stirring and heating, set the stirring speed to 100 rpm, and set the temperature to 50°C. Use a peristaltic pump to inject the cobalt nitrate solution into the reactor at a flow rate of 100mL / min, and stop feeding after 10 minutes; inject the ferric nitrate solution at a flow rate of 100mL / min after 5 minutes, and stop feeding after 10 minutes; after 5 minutes, use a flow rate of 100mL / min Pour in the nickel nitrate solution, and stop feeding after 10 minutes; after 5 minutes, pour in 2L of cobalt (II) n...

Embodiment 3

[0042] Weigh C 4 h 6 o 4 Co4H 2 O, C 4 h 6 o 4 Mn4H 2 O and deionized water are respectively configured into 2mol / L cobalt (II) acetate solution and manganese acetate (II) solution;

[0043] Weigh LiH 2 PO 4 1. Deionized water, prepare a 2mol / L lithium dihydrogen phosphate solution;

[0044] Inject 10L of lithium dihydrogen phosphate solution into a 30L normal-pressure reactor equipped with a stirring and heating device, start stirring and heating, set the stirring speed to 100rpm, and set the temperature to 80°C. Use a peristaltic pump to inject cobalt (II) acetate solution into the reactor at a flow rate of 100mL / min, and stop feeding after 15 minutes; inject manganese (II) acetate solution at a flow rate of 100mL / min after 5 minutes, and stop feeding after 15 minutes; In this way, 5 L of cobalt (II) acetate solution and 5 L of manganese (II) acetate solution were sequentially poured in, and after standing for 12 hours, the material was transferred to a suction fil...

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Abstract

A disclosed preparation method for a multilayer shell-core structural lithium ion battery comprises the following steps: preparing a lithium dihydrogen phosphate solution and solutions of various metal salts; alternately dropwise adding the salt solutions into the lithium dihydrogen phosphate solution, controlling the pH scope of 7-10 and the temperature of 50 DEG C-90 DEG C, precipitating a phosphatic precursor layer by layer, wherein the molar ratio of Li to the sum of metal element in the salt solutions is 1-1.05:1; filtering and drying separated precipitate to obtain the needed precursor; putting the precursor and a carbon source in a ball mill to mixing for 1 h-24 h; and roasting the mixed matter at 500 DEG C-800 DEG C under the protection of inert gas for 3 h-24 h. The method is capable of flexibly designing the element composition and the distribution sequence of the core material and the shell material by controlling the technology conditions and realizing the chemical construction of material multilayer cladding; and the prepared composite material has the integrated performances of composition materials.

Description

technical field [0001] The invention relates to the field of lithium-ion secondary battery materials, in particular to a preparation method of a multilayer shell-core structure lithium-ion battery material. Background technique [0002] In the current situation where the global auto industry is facing the huge challenges of the financial crisis and energy and environmental issues, there has been a broad international consensus on the development of electric vehicles, the electrification of automotive energy and power systems, and the promotion of the strategic transformation of the traditional auto industry. Lithium-ion battery is an ideal energy source for electric vehicles, and the development and application of battery technology and corresponding materials has become a key technology that determines the development of electric vehicles. [0003] Phosphate-based cathode materials have become one of the preferred cathode materials for power lithium-ion batteries because of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58
CPCC01B25/30H01M4/5825H01M10/0525Y02E60/10
Inventor 徐宁伏萍萍宋英杰吴孟涛
Owner 成都巴莫科技有限责任公司