Lithium ion battery composite anode material and preparation method thereof

A composite cathode material, lithium-ion battery technology, applied in battery electrodes, batteries, positive electrodes, etc., can solve the problems of low coating amount, easy to fall off, limited interaction effect, etc., and achieve good rate performance, stable structure, and cycle. stable effect

Active Publication Date: 2015-07-01
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the materials and technologies disclosed in this patent still have the following problems: 1) As described in this patent, in terms of the structure of the composite oxide material particles, the surface layer of the lanthanide oxide only serves to prevent the gap between the particles during high temperature sintering. mutual bonding
However, since the lanthanide oxide has no lithium ion conductivity, the coating amount must be very low so as not to reduce the discharge capacity and rate performance of the composite oxide particles, and the surface layer of the lanthanide oxide and the coating layer or core layer are oxidized. There is no chemical bond between the particles, so it is easy to fall off during the subsequent pulverization process, and the effect of inhibiting the interaction between the oxide particles of the coating layer or the core layer and the electrolyte is limited under high charging voltage; 2), the coating layer Li(NiMn)O 2 If the Ni / Mn molar ratio in its dopant is ≥ 1.1, the cycle performance of the composite lithium cobalt oxide material at a charging voltage of 4.4V or above (vs. Li) is not ideal

Method used

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  • Lithium ion battery composite anode material and preparation method thereof
  • Lithium ion battery composite anode material and preparation method thereof
  • Lithium ion battery composite anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Lithium cobaltate (molecular formula: LiCo) with an average particle size of 18.7 μm 0.994 Ti 0.002 Mg 0.004 o 2 , BET specific surface area 0.167 m 2 / g) 0.5% (mass fraction, the same as in the following examples) of LiNi is first formed on the surface of the core 0.5 mn 0.5 o 2 cladding layer, and then formed 1000ppmLiScO 2 surface layer.

[0050] Its preparation method is as follows: use deionized water to prepare a mixed solution of manganese acetate and nickel acetate with a concentration of 0.05M (manganese: nickel molar ratio = 1:1, called solution A1), and a concentration of 0.1M LiOH solution (called solution A1). solution B1), ammonia solution with a concentration of 0.52M (referred to as solution C1), and scandium nitrate solution with a concentration of 0.015M (referred to as solution D1).

[0051] Dissolve 4g of polyethylene glycol (PEG-6000) in 2000mL of deionized water under stirring, add to the reaction kettle, add 400g of lithium cobaltate with ...

Embodiment 2

[0053] Lithium cobaltate (molecular formula: LiCo) with an average particle size of 18.7 μm 0.994 Ti 0.002 Mg 0.004 o 2 , BET specific surface area 0.167m 2 / g) 2% LiNi is first formed on the surface of the core0.4975 mn 0.4975 Al 0.005 o 2 cladding layer, and then formed 1000ppmLiYO 2 surface layer.

[0054] Its preparation method is as follows: use deionized water to prepare a mixed solution of manganese acetate, nickel acetate and aluminum nitrate with a concentration of 0.2M (manganese: nickel molar ratio = 1:1, called solution A2), and a concentration of 0.4M LiOH solution (referred to as solution B2), ammonia solution with a concentration of 2.0M (referred to as solution C2), and yttrium nitrate solution with a concentration of 0.015M (referred to as solution D2).

[0055] With stirring, 4 g of polyoxyethylene ether C 56 h 114 o 21 Dissolve in 2000mL deionized water, add to the reaction kettle, add 400g of lithium cobalt oxide with an average particle size of...

Embodiment 3

[0057] Lithium cobaltate (molecular formula: LiCo) with an average particle size of 18.7 μm 0.994 Ti 0.002 Mg 0.004 o 2 , BET specific surface area 0.167m 2 / g) 5% LiNi is first formed on the core surface 0.5 mn 0.5 o 2 cladding layer, and then formed 2000ppmLiLaO 2 surface layer.

[0058] Its preparation method is as follows: use deionized water to prepare a mixed solution of manganese acetate and nickel acetate with a concentration of 0.5M (manganese: nickel molar ratio = 1:1, called solution A3), and a concentration of 1M LiOH solution (called solution A3). Solution B3), ammonia solution with a concentration of 5.2M (referred to as solution C3), and lanthanum nitrate solution with a concentration of 0.03M (referred to as solution D3).

[0059] Dissolve 4g of polyvinylpyrrolidone (PVP, K-30) in 2000mL of deionized water under stirring, add to the reaction kettle, add 400g of lithium cobaltate with an average particle size of 18.7μm into the reaction kettle, raise the...

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Abstract

The invention discloses a lithium ion battery composite anode material and a preparation method thereof, and in particular relates to a lithium ion battery anode material with a cladding layer and a surface layer and a preparation method thereof. The cladding layer of the composite material is an oxide at least containing Li, Ni, and Mn, and the surface layer is an oxide at least containing Li and rare earth element R. When circulating under the circumstances of total battery charging to 4.4V, the lithium ion battery composite anode material has the characteristics of stable structure, low reaction activity with electrolyte solution and high lithium ion conductivity, etc., so that under high voltage the total battery has the advantages of good cyclic stability, rate capability and high (low) temperature performance, etc.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to a lithium-ion battery composite cathode material and a preparation method thereof. Background technique [0002] In recent years, with the popularization of high-end electronic products such as cameras, smart phones and ultra-thin palm computers, there is an extremely urgent demand for small lithium-ion batteries with mass specific energy ≥ 200Wh / kg and volume specific energy ≥ 600Wh / L. [0003] High-voltage (charging voltage ≥ 4.4V vs. Li) lithium cobalt oxide is currently the most ideal cathode material for high-end small lithium-ion batteries, and it is also one of the hotspots in the research of cathode materials for lithium batteries at this stage. However, during the high charging voltage cycle, its lattice volume expansion and shrinkage rate are large, and the dissolution of cobalt in the electrolyte will also be accelerated. In ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505
CPCH01M4/131H01M4/1391H01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2220/30Y02E60/10
Inventor 龚金保乐俊成李栋梁
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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