Lithium ion battery anode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of new lithium-ion battery positive electrode materials and its preparation, can solve problems such as long operating time, uneven mixing, difficult carbon coating, etc., and achieve the effect of avoiding metal reduction

Active Publication Date: 2014-03-19
EVE ENERGY CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the method of carbon doping is mainly the mechanical mixing method, and the mechanical mixing method has disadvantages such as long operation time and uneven mixing; carbon coating can effectively improve the conductivity of the material, improve the surface chemistry of the active material, and prevent the electrode from directly contacting the electrolyte. Contact can improve the rapid charge-discharge performance and cycle performance of the electrode; while the commonly used lithium-ion battery cathode materials (lithium cobaltate, lithium manganate or thr

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

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Example Embodiment

[0033] The specific embodiment of the preparation method of lithium ion battery cathode material of the present invention, the process flow chart of described method is as attached figure 1 As shown, the method specifically includes the following steps:

[0034] (1) Synthesize the existing lithium-ion battery positive electrode material A by a conventional method. Specifically, the existing lithium-ion battery positive electrode material A may be lithium cobaltate positive electrode material; nickel, cobalt, manganese binary or ternary positive electrode material; manganic acid Lithium cathode materials (including layered doped lithium-rich lithium manganate, spinel lithium manganate);

[0035] (2) Prepare lithium-ion battery positive electrode material A and solvent S at a mass ratio of 0.5:1 to 5:1 to make a slurry, and gradually add it at a rate of 1 to 20mL / min under constant stirring to a concentration of 10% ~50% aluminum monoacetate or aluminum diacetate solution, the ...

Example Embodiment

[0040] Example 1

[0041] A kind of embodiment of the preparation method of a kind of lithium ion battery cathode material of the present invention, the method described in this embodiment comprises the following steps:

[0042] (1) Weigh 2000g of LiCoO synthesized by conventional method 2 Positive electrode material A, add 1000g deionized water 1500r / min speed and fully stir, and add 331.20g containing 33.12g (CH 3 COO) 2 The solution of AlOH, after dropwise addition, continued to stir for 3 hours, and stopped stirring;

[0043] (2) Filtrate and dry at 80°C for 20 hours, pass through a 200-mesh sieve, and then bake the dried powder in a muffle furnace at 500°C in an air atmosphere for 5 hours, and cool naturally to obtain LiCoO coated with an alumina layer B on the outer surface 2 Cathode material;

[0044] (3) 2000g of LiCoO coated with alumina layer B on the outer surface 2 The positive electrode material and 1000g of water are prepared into a mixed solution, and 200g ...

Example Embodiment

[0047] Example 2

[0048] A kind of embodiment of the preparation method of a kind of lithium ion battery cathode material of the present invention, the method described in this embodiment comprises the following steps:

[0049] (1) Weigh 2000g of LiCoO synthesized by conventional method 2 Positive electrode material A, add 500g deionized water and stir at a speed of 2000r / min, and add 101.40 containing 50.70g CH 3 COOAl(OH) 2 The solution, after the dropwise addition, continued to stir for 4 hours, and stopped stirring;

[0050] (2) Filtrate and dry at 100°C for 24 hours, pass through a 200-mesh sieve, then bake the dried powder in a muffle furnace at 600°C in an air atmosphere for 8 hours, and cool naturally to obtain LiCoO coated with an alumina layer B on the outside 2 Cathode material;

[0051] (3) 2000g of LiCoO coated with alumina layer B on the outer surface 2 The positive electrode material and 1000g of water are prepared into a mixed solution, and 400g of sucros...

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Abstract

The invention discloses a preparation method of a lithium ion battery anode material. The method is characterized in that the outer surface of the existing lithium ion battery anode material is sequentially coated with an aluminum oxide layer and a carbon layer, wherein the coating condition is liquid-phase coating, in the coating process of the aluminum oxide, the addition sequence of the existing lithium ion battery anode material and aluminum salt is adjusted, and the coating substance organic aluminum salt is added under the continuously stirring condition, so that a hydrolytic product is uniformly adsorbed onto the surface of an active substance. The carbon coating is carried out through a spray drying and rapid sintering way in the inert gas atmosphere, so that the problems that the metal is reduced due to the high-temperature carbon coating and the organic carbon source is difficultly carbonized in low temperature can be avoided. The invention also discloses a lithium ion battery anode material prepared through the method. The energy density and power density of the battery can be remarkably improved, and the cycling performance, the capacity retention rate and the safety performance of the battery can be improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a novel lithium ion battery cathode material and a preparation method thereof. Background technique [0002] In the 1980s, American scholar J.B.Goodenough and others first discovered lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ) and lithium manganate (LiMn 2 o 4 ) can be used as a material for deintercalating lithium ions. In the 1990s, Sony successfully applied lithium cobalt oxide to commercial small electronic products for the first time. Since then, lithium-ion batteries have been widely used in various electronic devices due to their high cycle performance, high operating voltage and low pollution. In recent years, with the continuous development of science and technology, the functions of electronic equipment have been continuously upgraded, so higher requirements have been placed on the energy and rate performance of lithium batteries. At present, c...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505H01M4/62
CPCY02E60/122H01M4/0471H01M4/366H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 吕正中刘范芬袁中直刘金成
Owner EVE ENERGY CO LTD
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