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Preparation method for neodymium, nickel and boron-doped lithium manganese phosphate composite positive electrode material

A composite positive electrode material, lithium manganese phosphate technology, applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of low electrochemical capacity, poor high temperature performance, poor conductivity, etc., to achieve high specific capacity, long life Effects of service life, improvement of electrical conductivity, and cycle stability

Inactive Publication Date: 2014-06-18
张萍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrode potential of lithium manganese phosphate relative to Li is 4.1V, which is much higher than the 3.4V voltage platform of lithium iron phosphate, and under this voltage platform, the conductivity of existing positive electrode materials is very poor, coupled with its electrochemical capacity Low, poor high temperature performance limits its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The chemical formula of the prepared neodymium nickel boron doped lithium manganese phosphate is LiMn 0.825 Ni 0.15 Nd 0.025 P 0.93 B 0.07 o 4 . Lithium oxalate, manganese chloride, ferrous sulfate, neodymium nitrate, phosphoric acid, boric acid are weighed according to the molar weight of Li, Mn, Ni, Nd, P, B in the above chemical formula.

[0018] The above-mentioned manganese chloride and ferrous sulfate are dissolved in deionized water to form a concentration of 0.975mol / L metal salt solution, and the above-mentioned phosphoric acid and boric acid are dissolved in deionized water to form an acid solution with a concentration of 1mol / L, and the above-mentioned metal salt Solution and acid solution were added dropwise to the reaction kettle at the same time, the dropping speed was 0.5mL / s respectively, the reaction kettle was heated to 60°C, stirred at a speed of 500r / min, and NH 3 ·H 2 O solution adjusts the pH value to 5-7, and obtains Mn after the reaction ...

Embodiment 2

[0023] The chemical formula of the prepared neodymium nickel boron doped lithium manganese phosphate is LiMn 0.76 Ni 0.2 Nd 0.04 P 0.87 B 0.13 o 4 . Lithium oxalate, manganese chloride, ferrous sulfate, neodymium nitrate, phosphoric acid, boric acid are weighed according to the molar weight of Li, Mn, Ni, Nd, P, B in the above chemical formula.

[0024] The above-mentioned manganese chloride and ferrous sulfate are dissolved in deionized water to form a concentration of 0.96mol / L metal salt solution, the above-mentioned phosphoric acid and boric acid are dissolved in deionized water to form an acid solution with a concentration of 1mol / L, and the above-mentioned metal salt Solution and acid solution were added dropwise to the reaction kettle at the same time, the dropping speed was 1mL / s respectively, the reaction kettle was heated to 70°C, stirred at a speed of 800r / min, and NH 3 ·H 2 O solution adjusts the pH value to 5-7, and obtains Mn after the reaction 0.76 Ni 0...

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PUM

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Abstract

The invention relates to a preparation method for a neodymium, nickel and boron-doped lithium manganese phosphate composite positive electrode material. The chemical formula of neodymium, nickel and boron-doped lithium manganese phosphate is LiMn1-x-yNixNdyP1-zBzO4, wherein x is equal to 0.15-2, y is equal to 0.025-0.04, and z is equal to 0.07-0.13. The method comprises the following steps of (1) preparing a precursor Mn1-x-yNixNdyP1-zBzO4; (2) putting the precursor and lithium oxalate into a ball grinder, adding a ball grinding medium acetone, and performing ball grinding, drying and pre-sintering; (3) mechanically mixing a pre-sintered product with glucose, performing secondary ball grinding after the materials are uniformly mechanically mixed, and performing secondary calcining to obtain the neodymium, nickel and boron-doped lithium manganese phosphate composite positive electrode material. According to the neodymium, nickel and boron-doped lithium manganese phosphate composite positive electrode material prepared by the preparation method, a lithium manganese phosphate composite material is doped with a rare earth element Nd and a metal element Ni to replace part of Mn and then is doped with B to replace part of P, so that the electron migration rate and the substance activity are improved, and a carbon wrapping network is formed on the surface of the neodymium, nickel and boron-doped lithium manganese phosphate composite positive electrode material.

Description

Technical field [0001] The invention relates to a preparation method of a neodymium nickel boron doped manganese lithium phosphate composite positive electrode material. Background technique [0002] Lithium-ion batteries have been widely used in portable devices such as mobile phones, notebook computers, and digital electronic products. With the increase in multi-functionality and integration of mobile devices, and the development of electric vehicles and photovoltaic industries, lithium-ion batteries have shown broader potential. Application prospects. The safety and electrochemical performance of lithium-ion batteries largely depend on the cathode material. In the current commercial lithium-ion batteries, lithium cobalt oxide (LiCoO 2 ), spinel lithium manganate (LiMn 2 o 4 ), ternary materials (nickel-cobalt-manganese-lithium) and olivine-type lithium iron phosphate (LiFePO 4 ), but there are problems with these materials. The thermal stability of lithium cobaltate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 张萍
Owner 张萍