Modified lithium-ion battery cathode material and preparation method thereof

A technology of lithium ion battery and positive electrode material, applied in the field of lithium ion battery positive electrode material and its preparation

Active Publication Date: 2018-06-29
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, there is no lithium-ion battery positive electrode material with good fluidity and electrochemical performance or its preparation method

Method used

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  • Modified lithium-ion battery cathode material and preparation method thereof
  • Modified lithium-ion battery cathode material and preparation method thereof
  • Modified lithium-ion battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] In the 5t median particle size D50 is 6 μm lithium-ion battery positive electrode material Li (Ni 0.5 co 0.2 mn 0.3 )O 2 In, add 5kg of SiO with a particle size of 15nm 2 , crushed until the average particle size of the lithium-ion battery positive electrode material is 6-7 μm, the speed of the gravity-free mixer is 40r / min, iron removal, batch mixing for 2 hours, and passing through a 300-mesh ultrasonic vibrating sieve to obtain the final product.

[0075] The prepared sample was charged and discharged at a negative electrode of carbon at a high temperature of 55°C and 1C, and the capacity retention rate was 94.5% after 200 cycles.

[0076] For lithium 2032, the capacity of the button battery is 164.5mAh / g at 0.2C and 156mAh / g at 1C.

Embodiment 2

[0078] Lithium-ion battery cathode material Li(Ni) with a median particle size D50 of 3 μm at 3t 0.5 co 0.2 mn 0.3 )O 2 In, add 10kg of SiO with an average particle size of 30nm 2 , crushed until the particle size of the lithium-ion battery positive electrode material is 3-4 μm, the speed of the non-gravity mixer is 40r / min, iron is removed, mixed in batches for 2 hours, and the final product is obtained by a 300-mesh ultrasonic vibrating screen.

[0079] The prepared sample was charged and discharged at 55°C at a negative electrode temperature of 1C, and the capacity retention rate was 94% after 200 cycles.

[0080] For lithium 2032, the capacity of the button battery is 165mAh / g at 0.2C and 157mAh / g at 1C.

Embodiment 3

[0082] Synthesized Li(Ni 0.5 co 0.2 mn 0.3 )O 2 After 5t, add 15kg of SiO with a particle size of 30nm 2 , crushed until the particle size of the positive electrode material of the lithium-ion battery is 3-4 μm, the speed of the cone mixer is 30r / min, iron is removed, mixed in batches for 2 hours, and passed through a 300-mesh ultrasonic vibrating sieve to obtain the final product.

[0083] The prepared sample was charged and discharged at 55°C at a negative electrode temperature of 1C, and the capacity retention rate was 94% after 200 cycles.

[0084] For lithium 2032, the capacity of the button battery is 164mAh / g at 0.2C and 155mAh / g at 1C.

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Abstract

The invention provides a modified lithium-ion battery cathode material. The cathode material is coated with a nano-additive. The invention also provides a method for preparing the modified lithium-ionbattery cathode material. According to the method, a silicon-containing nano-compound is added into a cathode material body, so that the surface of the lithium-ion battery cathode material is coatedwith the silicon-containing nano-compound, the interaction among particles of the lithium-ion battery cathode material is blocked, the liquidity of the lithium-ion battery cathode material is increased, and meanwhile, the electrochemical performance of the lithium-ion battery cathode material is improved.

Description

technical field [0001] The invention relates to the field of lithium-ion battery cathode materials, in particular to a lithium-ion battery cathode material with good fluidity and a preparation method thereof. Background technique [0002] At present, among the lithium-ion cathode materials, it has become the current mainstream technical route to use large and small particle sizes at high temperature and then crush them together to improve the compacted density, capacity, and rate performance of the material. [0003] However, many lithium-ion cathode materials, especially those with small particle sizes, are prone to blockage and difficulty in sieving due to poor material fluidity during crushing or transportation. [0004] In the production process of small particle size lithium-ion battery cathode materials, material blocking occurs in crushing, automatic feeding, batch mixing, and sieving, which reduces production efficiency and speed, and excessive crushing is easy to oc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/628H01M10/0525Y02E60/10
Inventor 朱晓沛江卫军吴剑文高智白珍辉庞自钊周宏宝苏迎春张溪
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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