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A kind of positive electrode material of lithium ion battery with core-shell structure and preparation method thereof

A lithium-ion battery, core-shell structure technology, applied in the field of materials, can solve the problems of reducing material cycle performance, increasing lattice parameters, etc., achieve excellent rate performance and cycle performance, and the effect of simple and feasible preparation method

Active Publication Date: 2016-02-24
哈尔滨博尔特能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

mn 3+ The presence of content has contradictory effects on the material, on the one hand, due to the fact that Mn 3+ The radius of the ion is relatively large, which increases the lattice parameter, which is beneficial to Li + The transport of ions in the material, so it has a better rate performance, on the other hand, due to the Mn 3+ Disproportionation reaction is easy to occur, and the generated divalent manganese will dissolve in the electrolyte, migrate to the negative electrode, and deposit on the surface of the negative electrode, so Mn 3+ The presence of the material will reduce the cycle performance of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0022] Specific implementation mode 1: In this implementation mode, the electrode material is prepared according to the following steps:

[0023] Weigh 0.028mol of manganese sulfate, 0.01mol of nickel sulfate and 0.002mol of molybdenum chloride and dissolve them in 1L of deionized water, add 1L of a solution containing 0.09mol of sodium hydroxide to obtain a suspension, and then dropwise add 0.5L solution containing 0.003mol manganese sulfate and 0.001mol nickel sulfate and 0.5L solution containing 0.008mol sodium hydroxide. Filter, wash and dry to obtain a precipitate, mix the precipitate with 0.023mol lithium hydroxide to obtain a precursor, put the above precursor in a muffle furnace, pre-calcine at 500°C for 4h, calcinate at 850°C for 12h, and then anneal at 650°C After 24 hours, the lithium-ion battery positive electrode material with core-shell structure was obtained.

specific Embodiment approach 2

[0024] Specific embodiment two: In this embodiment, the electrode material is prepared according to the following steps:

[0025] Weigh 0.029mol manganese sulfate, 0.005mol nickel sulfate, 0.005mol nickel nitrate and 0.001mol molybdenum chloride, dissolve in 1L deionized water, add 1L solution containing 0.1mol sodium hydroxide to obtain a suspension, and then add 0.5L solution containing 0.003mol manganese sulfate and 0.001mol nickel sulfate and 0.5L solution containing 0.004mol sodium carbonate were added dropwise to the suspension. Filter, wash and dry to obtain a precipitate, mix the precipitate with 0.023mol lithium nitrate to obtain a precursor, put the above precursor in a muffle furnace, pre-calcine at 400°C for 4h, calcinate at 800°C for 20h, and then anneal at 700°C for 20h , to obtain a lithium ion battery positive electrode material with a core-shell structure.

specific Embodiment approach 3

[0026] Specific embodiment three: In this embodiment, the electrode material is prepared according to the following steps:

[0027] Take by weighing 0.018mol manganese nitrate and 0.01mol manganese chloride, 0.01mol nickel sulfate and 0.002mol chromium chloride, dissolve in 1L deionized water, add 1L solution containing 0.05mol sodium carbonate therein, obtain suspension, then add Add dropwise 0.5 L of a solution containing 0.003 mol of manganese sulfate and 0.001 mol of nickel sulfate and 0.5 L of a solution containing 0.004 mol of sodium bicarbonate into the suspension. Filter, wash and dry to obtain a precipitate, mix the precipitate with 0.023mol lithium hydroxide to obtain a precursor, put the above precursor in a muffle furnace, pre-calcine at 500°C for 4h, calcinate at 850°C for 12h, and then anneal at 650°C After 24 hours, the lithium-ion battery positive electrode material with core-shell structure was obtained.

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Abstract

The invention provides a lithium ion battery positive electrode material of a core-shell structure as well as a preparation method thereof, wherein the lithium ion battery positive electrode material is of a core-shell structure, and the material of a core layer is LiNi0.5Mn(1.5-x)NxO4, wherein x is equal to 0.002-0.12, and N=Mo or Cr; the material of a shell layer is LiNi0.5Mn1.5O4, and the mass percentage of the material of the shell layer accounts for 2-20% that of the material of the core layer. The preparation method comprises the following steps: preparing a precursor of the core-shell structure by a coprecipitation method, and then preparing the lithium ion battery positive electrode material of the core-shell structure by high-temperature forging and annealing treatment. The core layer material in the material is doped with a high-valance-state element, the chemical valence of partial manganese is reduced from positive tetravalence to positive trivalence; the existence of the trivalent manganese improves the multiplying power performance of the material; the material of the core layer does not contain Mn<3+>, and prevents the dissolving of manganese caused by trivalent manganese; the material cycle performance is improved.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a lithium ion battery cathode material and a preparation method thereof, in particular to a lithium ion battery cathode material with a core-shell structure and a preparation method thereof. Background technique [0002] In response to the global energy crisis, governments of various countries are actively promoting the development of new energy vehicles, mainly electric vehicles. Power battery is an important part of electric vehicles, which directly affects the performance of electric vehicles. Lithium-ion batteries have the obvious advantages of high working voltage, no memory effect, low self-discharge rate, high energy density and long cycle life. As power batteries, they have broad application prospects. [0003] Among the cathode materials for lithium-ion batteries, the spinel cathode material LiNi 0.5 mn 1.5 o 4 It has a high discharge platform of 4.7V and a high theo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王振波薛原玉富达张音刘宝生
Owner 哈尔滨博尔特能源科技有限公司