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A kind of positive electrode material of layer structure lithium ion battery and preparation method thereof

A lithium-ion battery and cathode material technology, which is applied in battery electrodes, structural parts, circuits, etc., can solve the problem that the cycle stability and rate performance of cathode materials are not ideal, cannot meet the requirements of practical applications, and cathode material rate performance bottlenecks, etc. problems, to achieve excellent rate performance, improve rate performance, and shorten the diffusion distance.

Active Publication Date: 2015-08-26
杭州亿昇达新能源科技有限公司
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Problems solved by technology

[0005] However, the cycle stability and rate performance of this type of lithium-rich layered structure lithium-ion battery cathode materials are still not ideal, and cannot meet the requirements of practical applications.
Especially due to the lower conductivity of Li 2 MnO 3 The existence of phases and the decrease in lattice order during the first activation process affect the transport of lithium ions, so the rate performance of this type of lithium-rich layered lithium-ion battery cathode material has become one of the bottlenecks for its practical application.

Method used

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  • A kind of positive electrode material of layer structure lithium ion battery and preparation method thereof
  • A kind of positive electrode material of layer structure lithium ion battery and preparation method thereof

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Effect test

Embodiment 1

[0031] According to the molar ratio of 1.236:0.54:0.13:0.13, the raw material LiNO 3 , Mn(CH 3 COO) 2 4H 2 O, Ni(CH 3 COO) 2 ·6H 2 O and Co(CH 3 COO) 2 4H 2 O is dissolved in absolute ethanol (an excess of 3% lithium salt is added to offset the loss of lithium at high temperature) to form a metal salt ethanol solution, and the lithium salt, nickel salt, manganese salt and cobalt salt in the metal salt ethanol solution The total concentration is 1mol / L.

[0032] Take 10mL metal salt ethanol solution and put it into a 100mL corundum crucible, put the corundum crucible into a box furnace preheated to 500°C, ignite, react vigorously in the air for 10 minutes, cool to room temperature 25°C, and obtain the preliminary The product was ground and put into the box furnace again, annealed at 800°C for 16 hours, and then cooled to room temperature 25°C with the furnace to obtain a ternary lithium-rich layered structure lithium-ion battery positive electrode material.

[0033] T...

Embodiment 2

[0038] According to the molar ratio of 1.236:0.54:0.13:0.13, the raw material LiNO 3 , Mn(NO 3 ) 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O and Co(CH 3 COO) 2 4H 2 O is dissolved in absolute ethanol (an excess of 3% lithium salt is added to offset the loss of lithium at high temperature) to form a metal salt ethanol solution, and the lithium salt, nickel salt, manganese salt and cobalt salt in the metal salt ethanol solution The total concentration is 2mol / L.

[0039]Take 10mL metal salt ethanol solution and put it into a 100mL corundum crucible, put the corundum crucible into a box furnace preheated to 500°C, ignite, react vigorously in the air for 10 minutes, cool to room temperature 25°C, and obtain the preliminary The product was ground and put into the box furnace again, annealed at 800°C for 16 hours, and then cooled to room temperature 25°C with the furnace to obtain a ternary lithium-rich layered structure lithium-ion battery positive electrode material.

[0040] The pre...

Embodiment 3

[0045] According to the molar ratio of 1.236:0.56:0.16:0.08, the raw material LiNO 3 , Mn(CH 3 COO) 2 4H 2 O, Ni(CH 3 COO) 2 ·6H 2 O and Co(CH 3 COO) 2 4H 2 O is dissolved in absolute ethanol (an excess of 3% lithium salt is added to offset the loss of lithium at high temperature) to form a metal salt ethanol solution, and the lithium salt, nickel salt, manganese salt and cobalt salt in the metal salt ethanol solution The total concentration is 1mol / L.

[0046] Take 10mL metal salt ethanol solution and put it into a 100mL corundum crucible, put the corundum crucible into a box furnace preheated to 500°C, ignite, react vigorously in the air for 10 minutes, cool to room temperature 25°C, and obtain the preliminary The product was ground and put into the box furnace again, annealed at 800°C for 16 hours, and then cooled to room temperature 25°C with the furnace to obtain a ternary lithium-rich layered structure lithium-ion battery positive electrode material.

[0047] T...

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Abstract

The invention discloses a method for preparing a lithium ion battery positive electrode material in a layer structure. The method comprises the following steps of: dissolving lithium salt, nickel salt, manganese salt and cobalt salt into ethanol; igniting a metal salt ethanol solution at 400-600 DEG C under an air or oxygen atmosphere; reacting for 5-15 minutes after the metal salt ethanol solution is ignited; cooling and annealing the metal salt ethanol solution at 700-900 DEG C to prepare the lithium ion battery positive electrode material in the layer structure; using the ethanol as a solvent and fuel to simplify a preparation process and quickly and violently reacting to facilitate the formation of nanoscale uniform particles. The invention also discloses the lithium ion battery positive electrode material in the layer structure, the chemical formula is aLi2MnO3.(1-a)LiMO2, M=MnxNiyCoz, x is more than or equal to 0.3, y is less than or equal to 0.45, and 4x plus 2y plus 3z equals to 3; and therefore, the lithium ion battery positive electrode material in the layer structure is lithium-rich oxide in a ternary layer structure, can be small primary particles which are uniformly distributed, and has good crystallinity.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a layered structure lithium ion battery positive electrode material and a preparation method thereof. Background technique [0002] Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high platform voltage (about 3.2~3.7V), high energy density, and no memory effect, and have been widely used in mobile phones, cameras, notebook computers, portable appliances, etc. application. At present, lithium-ion batteries that have been commercially produced mainly use LiCoO 2 As the cathode material, LiCoO 2 It has high capacity and good stability, but this kind of cathode material has problems in performance, economy and environment. Ohzuku and Makimura et al. in the literature "Layered lithium-ion insertion type cathode material LiCo for lithium-ion batteries 1 / 3 Ni 1 / 3 mn 1 / 3 o 2 "(Layered lithium insertio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 涂江平施少君唐阳洋张永起俞迎霞王秀丽谷长栋
Owner 杭州亿昇达新能源科技有限公司
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