Lithium-ion battery cathode material and preparation method thereof

A technology of lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as safety hazards, cycle life, etc., to suppress battery flatulence, increase lithium ion diffusion rate and electronic conductivity, and improve lithium ion conductivity. Effect of ion diffusion rate

Active Publication Date: 2017-08-08
QINGHAI CONTEMPORARY AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In view of this, it is necessary to provide a modification method, which combines the advantages of doping and coating, and at the same time constructs a special multi-layer coating structure, which can improve the LiMn x Fe 1-x PO 4 The electrochemical performance of the material can solve the safety hazards and cycle life problems caused by the dissolution of manganese and iron elements in the material, and this modification method can significantly reduce the production cost of the material. The prepared LiMn x Fe 1-x PO 4 The material has excellent low-temperature electrochemical performance

Method used

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  • Lithium-ion battery cathode material and preparation method thereof
  • Lithium-ion battery cathode material and preparation method thereof
  • Lithium-ion battery cathode material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0027] The first step is to massage the molar ratio Li:Mn:Fe:P:surfactant=0.95:0.8:0.2:1:0.1 to prepare lithium hydroxide, manganese sulfate, ferrous sulfate, phosphoric acid, and cetyltrimethyl. Ammonium bromide, use deionized water to dissolve lithium hydroxide to prepare a 2.5mol / L aqueous solution, add manganese sulfate, ferrous sulfate, and phosphoric acid to a reactor with a reflux device, and then add deionized water to the reactor and stir Dissolve to form solution I, keep the total concentration of Mn and Fe in solution I at 1.8 mol / L, add ethylene glycol to the reactor according to the total volume of deionized water in solution I: the total volume of ethylene glycol is 1:1, Then add cetyltrimethylammonium bromide, slowly add lithium hydroxide solution into the reactor under continuous stirring, and then add 2.5mol / L NaOH solution to the mixture until the pH value of the mixed solution is adjusted to 8.0. Form mixture II;

[0028] In the second step, the reactor is pla...

Embodiment 2～23

[0031] The chemical formula and raw material types of the obtained target product, the pH value of the liquid system, the calcination temperature and time and other process parameters are shown in Table 1.

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Abstract

The invention provides a positive electrode material of a lithium ion battery. The chemical formula of the positive electrode material is Li(1-a)NaaMnxFe(1-x)PO4(MeFy)b(C)c, wherein a is more than 0 and smaller than or equal to 0.08, b is more than 0 and smaller than 0.15, c is more than 0 and smaller than 1.5, b+c is smaller than 1.5, x is more than or equal to 0.1 and smaller than or equal to 0.9, MeFy is at least one of AlF3, TiF4, MgF2, ZrF4, MoF6 and NbF4; the positive electrode material is of a core-shell structure, and sequentially comprises a Na<+> bulk phase doped Li(1-a)NaaMnxFe(1-x)PO4 inner core layer, a middle transitional layer containing metal fluoride MeFy, and a carbon coverage layer positioned on the surface. The invention also provides a preparation method of the positive electrode material. According to the positive electrode material, the electric conductivity is improved, the bloating of the positive electrode material is effectively inhibited, the cycle life of the battery is prolonged, and the high-temperature storage property of the battery is improved.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a modified lithium iron manganese phosphate as a positive electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium Iron Manganese Phosphate (LiMn x Fe 1-x PO 4 ) As a cathode material for lithium-ion batteries, it has a wide range of applications in the electric vehicle (EV) and energy storage system (ESS) markets. LiMn x Fe 1-x PO 4 It can provide higher working potential and higher discharge capacity, and it has the advantages of low price, environmental friendliness, abundant raw materials, good thermal stability, and high safety. It has been recognized by the market. But LiMn x Fe 1-x PO 4 The extremely low intrinsic electronic conductivity and lithium ion diffusion rate affect its electrochemical performance, thereby hindering its commercial application. Therefore, increase LiMn x Fe 1-x PO 4 Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/5825H01M4/62H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 吴关
Owner QINGHAI CONTEMPORARY AMPEREX TECH
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