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Ion doping and surface cladding jointly-modified lithium ion battery anode material and preparation method thereof

A lithium-ion battery, ion doping technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of positive electrode structure damage, easy redox reaction, thermodynamic instability, etc.

Inactive Publication Date: 2018-03-06
GUIZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the actual charge and discharge process, the NCM ternary material and the electrolyte are in a thermodynamically unstable state, and oxidation-reduction reactions are prone to occur, resulting in the dissolution of some metal ions in the NCM material into the electrolyte, and the destruction of the positive electrode structure, resulting in poor battery performance. Therefore, improving the structural stability of positive NCM ternary materials during charge and discharge, and reducing the degree of reaction between NCM materials and electrolytes are the key to improving the performance of lithium-ion batteries

Method used

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  • Ion doping and surface cladding jointly-modified lithium ion battery anode material and preparation method thereof
  • Ion doping and surface cladding jointly-modified lithium ion battery anode material and preparation method thereof
  • Ion doping and surface cladding jointly-modified lithium ion battery anode material and preparation method thereof

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preparation example Construction

[0042] In some embodiments, there is also provided the above-mentioned ion doping and surface coating co-modified lithium-ion battery positive electrode material preparation method, comprising the following steps:

[0043] (1) According to the general formula Li(Ni x co y mn 1-x-y ) 1-a Nb a o 2 In the stoichiometric ratio, weigh nickel salt, cobalt salt, manganese salt, lithium salt, Nb compound, add to deionized water, and add 2.620g citric acid and 5.012g ethylene glycol with 500mL deionized water, dissolve to prepare into a sol, evaporated to dryness into a gel, dried, and placed in a sintering furnace, calcined at 750-1000°C for 6-15h, crushed, and ground to obtain Li(Ni x co y mn 1-x-y ) 1-a Nb a o 2 material, wherein, a is 0.005~0.2; or according to the general formula Li(Ni x co y mn 1-x-y ) 1-a Nb a o 2 For the stoichiometric ratio, weigh the compounds of nickel salt, cobalt salt, manganese salt, lithium salt, and Nb, and mix them well. , grind to get...

Embodiment 1

[0052] Preparation of Li(Ni) coated with 2% LBP 0.6 co 0.2 mn 0.2 ) 0.95 Nb 0.05 o 2 Positive electrode material, its concrete steps are as follows:

[0053] (1) Take by weighing 4.081g lithium acetate, 5.674g nickel acetate, 1.893g cobalt acetate, 1.863g manganese acetate, 1.076g niobium oxalate, 2.620g citric acid and 5.012g ethylene glycol all dissolve in the deionized water of 500ml, in Stir and heat in a water bath with a set temperature of 80°C, evaporate to dryness to form a gel, and place it in an oven at 120°C for 6 hours. The dried gel was ground into a crucible and placed in a tube furnace, and sintered at 850°C for 12h in an air atmosphere. The sintered block was ground and crushed to obtain a 622NCM material with a Nb-doped molarity of 0.05.

[0054] (2) Weigh lithium metaborate, boric acid and ammonium dihydrogen phosphate according to the stoichiometric ratio of LBP, and dissolve them in a mixture of 90 mL ethanol and 30 mL water. Add the materials obtai...

Embodiment 2

[0057] Preparation of Li(Ni) coated with 2% LBP 0.6 co 0.2 mn 0.2 ) 0.9 Nb 0.1 o 2 Positive electrode material, the present embodiment differs from Example 1 in that the quality of each metal salt taken in step (1) is respectively 4.081g lithium acetate, 5.375g nickel acetate, 1.793g cobalt acetate, 1.764g manganese acetate, 2. 152 g niobium oxalate. Other operating steps and parameters are the same as in Example 1.

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Abstract

The invention relates to the technical field of a lithium battery anode material, in particular to an ion doping and surface cladding jointly-modified lithium ion battery anode material and a preparation method thereof. The ion doping and the surface cladding are collectively used for modifying a lithium ion battery anode active material - an NCM material, so that the modification of the interiorand the surface of the NCM material can be realized, the internal structure of the material is stabilized, the lithium ion dispersion capacity at an interface of the material and the electrolyte is also improved, a protection effect for the material can be realized, the side reaction of the material and electrolyte can be effectively reduced in the charging and discharging process, and the cyclingstability and rate capacity of the lithium ion battery can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery positive electrode materials, in particular to a lithium ion battery positive electrode material co-modified by ion doping and surface coating and a preparation method thereof. Background technique [0002] With the vigorous development of energy storage power stations and new energy vehicles, the research and development and application of lithium-ion batteries have ushered in a period of rapid development; for new energy vehicles powered by lithium-ion batteries, their energy density is still not comparable to that of traditional Compared with fuel vehicles, the research and development of lithium-ion batteries with low cost and high energy density has become the focus of continuous research in the field of lithium batteries. [0003] The positive electrode material is a key component of lithium-ion batteries. Whether its performance is good or not, to a large extent, determines the perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCY02E60/10
Inventor 葛武杰马先果唐安江
Owner GUIZHOU INST OF TECH
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