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Lithium ion battery ferrous phosphate manganese lithium positive electrode material and preparation method thereof

A technology for lithium ferrous manganese phosphate and lithium-ion batteries, which is applied in the field of lithium-ion battery lithium ferrous manganese phosphate cathode materials and its preparation, can solve problems such as hindering the promotion of lithium ferrous phosphate, low energy density, and poor cycle performance, and achieve Low price, good safety performance, and the effect of improving energy density

Active Publication Date: 2014-05-14
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium iron phosphate has obvious disadvantages: low energy density, which cannot meet the increasingly stringent requirements of the society, and seriously hinders the continued industrialization of lithium iron phosphate
[0004] Lithium manganese phosphate and lithium ferrous phosphate both belong to the olivine structure, the theoretical specific capacity is the same, but the discharge voltage platform is 4.1 V, the energy density has been greatly improved, but manganese ions are easily dissolved in the electrolyte, resulting in structure collapse and capacity attenuation Severe and poor cycle performance, so it is urgent to improve and modify in application

Method used

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  • Lithium ion battery ferrous phosphate manganese lithium positive electrode material and preparation method thereof
  • Lithium ion battery ferrous phosphate manganese lithium positive electrode material and preparation method thereof
  • Lithium ion battery ferrous phosphate manganese lithium positive electrode material and preparation method thereof

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Embodiment 1

[0026] A lithium iron manganese phosphate positive electrode material for a lithium ion battery, the positive electrode material includes a core layer and a shell layer, wherein the core layer is lithium manganese phosphate, and the shell layer is lithium iron phosphate, such as figure 1 , figure 2 .

[0027] A preparation method of a lithium ferrous manganese phosphate lithium positive electrode material for a lithium ion battery, comprising the following steps:

[0028] 1. React manganese nitrate and ammonium phosphate at a molar ratio of 1:1 to synthesize manganese phosphate, wash at 80°C, and dry for 10 hours to obtain a nuclear layer manganese phosphate precursor.

[0029] 2. Disperse the nuclear layer manganese phosphate precursor in step 1 in water to make solution A.

[0030] 3. Dissolve ferrous sulfate in water to make solution B.

[0031] 4. Add the solution B in step 3 to the solution A in step 2, control the molar ratio of ferrous sulfate and manganese phosphat...

Embodiment 2

[0035] A lithium iron manganese phosphate positive electrode material for a lithium ion battery. The positive electrode material includes a core layer and a shell layer, wherein the core layer is lithium manganese phosphate, and the shell layer is lithium iron phosphate.

[0036] A preparation method of a lithium ferrous manganese phosphate lithium positive electrode material for a lithium ion battery, comprising the following steps:

[0037] 1. Reaction of manganese sulfate and ammonium dihydrogen phosphate according to the molar ratio of 1:1 to synthesize manganese phosphate, washing at 80°C and drying for 10 hours to obtain the nuclear layer manganese phosphate precursor.

[0038] 2. Disperse the nuclear layer manganese phosphate precursor in step 1 in water to make solution A.

[0039] 3. Dissolve ferrous oxalate in water to make solution B.

[0040] 4. Add solution B in step 3 to solution A in step 2, control the molar ratio of ferrous oxalate and manganese phosphate to ...

Embodiment 3

[0044] A lithium iron manganese phosphate positive electrode material for a lithium ion battery. The positive electrode material includes a core layer and a shell layer, wherein the core layer is lithium manganese phosphate, and the shell layer is lithium iron phosphate.

[0045] A preparation method of a lithium ferrous manganese phosphate lithium positive electrode material for a lithium ion battery, comprising the following steps:

[0046] 1. React manganese chloride and ammonium dihydrogen phosphate to synthesize manganese phosphate according to the molar ratio of 1:1, wash and dry at 80°C for 10 hours to obtain the precursor of manganese phosphate in the core layer.

[0047] 2. Disperse the nuclear layer manganese phosphate precursor in step 1 in water to make solution A.

[0048] 3. Dissolve ferrous chloride in water to make solution B.

[0049] 4. Add solution B in step 3 to solution A in step 2, control the molar ratio of ferrous chloride and manganese phosphate to 1:...

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Abstract

The invention relates to a lithium ion battery ferrous phosphate manganese lithium positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion battery positive electrode materials. The positive electrode material comprises a core layer and a shell layer, the core layer is made of lithium manganese phosphate, and the shell layer is made of lithium iron phosphate. Manganese source compound and phosphorus source compound are used as raw materials to compound the manganese phosphate core layer, then iron source compound is introduced, through the solubility product principle and exchanging of iron ions and manganese ions, a ferrous phosphate manganese precursor of the core-shell structure is obtained, then lithium mixing and high-temperature calcination are carried out, and ferrous phosphate manganese lithium of the core-shell structure is prepared. The ferrous phosphate manganese lithium positive electrode material, on one hand, can improve a voltage platform and energy density, and on the other hand, can solve the problems of the unstable structure and severe capacity fading due to the fact that manganese is located in the core layer and prevented from making direct contact with electrolyte for dissolution.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ferrous manganese phosphate positive electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] The power lithium-ion battery is a high-energy battery that has been developed rapidly in the past five years. It has significant advantages such as long life, high energy density and high voltage platform. It has become an important direction for the development of my country's new energy industry. [0003] Cathode materials are an important part of power batteries. Lithium iron phosphate cathode material with orthorhombic olivine structure has attracted great attention and attention from scientific, industrial and political circles at home and abroad because of its low price, abundant resources, stable structure and excellent safety performance. However, lithium iron phosphate has obvious disadvant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/45
CPCC01B25/45H01M4/5825Y02E60/10
Inventor 王启岁张昌春邢军龙
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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