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Positive pole material and positive pole piece for lithium ion battery and lithium ion battery

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems that cathode materials need to be improved, limited energy density improvement, poor cycle performance, etc., and achieve excellent high-voltage cycle stability and energy. The effect of density

Inactive Publication Date: 2019-06-14
昆山聚创新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN108232304A uses NCA positive electrode material, high-capacity graphite negative electrode material, and optimizes the thickness of copper and aluminum foil to increase the energy density of the battery, but the charging voltage is conventional 4.2V, and the cycle performance is poor
In the patent CN108511748A, nickel-cobalt manganate ternary lithium (NCM) positive electrode material and graphite negative electrode material are used, and the energy density of the battery is improved by optimizing the process. The nickel content of the NCM positive electrode material is ≤ 60%, and the charging voltage of the battery is conventional 4.2V. Although the battery The cycle performance is better, but the energy density is limited
It can be seen that the existing cathode materials for lithium-ion batteries still need to be improved.

Method used

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  • Positive pole material and positive pole piece for lithium ion battery and lithium ion battery
  • Positive pole material and positive pole piece for lithium ion battery and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0075] Lithium-ion power batteries are prepared according to the general method, wherein the positive electrode active material adopts LiNi 0.88 co 0.09 al 0.03 o 2 , the negative electrode active material adopts artificial graphite with a capacity ≥355mA·h / g, and 4.5wt% LiBOB, 1.5v% VC, 1.5v% PS and 2v% MEMS are added to the electrolyte. The capacity ratio (N / P ratio) of the diaphragm, the negative pole piece and the positive pole piece is the same as the general method.

Embodiment 2

[0077] Lithium-ion power batteries are prepared according to the general method, wherein the positive electrode active material adopts LiNi 0.88 co 0.09 al 0.03 o 2 The negative electrode active material adopts artificial graphite with capacity ≥355mA·h / g, and 15wt% LiBOB, 1.0v% VC, 1.5v% PS, 0.5v% MSM and 0.5v% MEMS are added to the electrolyte. The capacity ratio (N / P ratio) of the diaphragm, the negative pole piece and the positive pole piece is the same as the general method.

Embodiment 3

[0079] Lithium-ion power batteries are prepared according to the general method, wherein the positive electrode active material adopts LiNi 0.88 co 0.09 al 0.03 o 2 , the negative electrode active material adopts artificial graphite with a capacity ≥355mA·h / g, and 3wt% LiBOB, 2v% VC, 2.5v% PS and 3v% EMS are added to the electrolyte. The capacity ratio (N / P ratio) of the diaphragm, the negative pole piece and the positive pole piece is the same as the general method.

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Abstract

The invention discloses a positive pole material and a positive pole piece for a lithium ion battery and a lithium ion battery. The positive pole material has the composition as shown in a formula (1): LiNixCoyAl1-x-yO2 (I); in the formula (I), and x and y simultaneously meet conditions that x is greater than or equal to 0.8 and smaller than or equal to 0.92, y is greater than or equal to 0.05 andsmaller than or equal to 0.2, and 1-x-y>0. The positive pole material, by adopting a nickel cobalt lithium aluminate material with the optimal composition, has excellent high-voltage cycling stability and a higher energy density.

Description

technical field [0001] The invention relates to the battery field, in particular, the invention relates to a positive electrode material for a lithium ion battery, a positive pole piece and a lithium ion battery. Background technique [0002] Cathode material is one of the key elements restricting the energy density of power batteries. At present, the common positive electrode materials for lithium-ion power batteries mainly include lithium manganate (LiMnO) with a spinel structure. 2 o 4 ), lithium iron phosphate (LiFePO 4 ) and layered lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ). Lithium manganate is a typical representative of spinel-type intercalation compounds, with a reversible capacity of about 120mAh / g. It has the characteristics of good safety, no environmental pollution, high working voltage, and low cost. Its three-dimensional tunnel structure is more conducive to lithium ion The intercalation and deintercalation are suitable for use as cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/525H01M4/58H01M4/46H01M10/0525
CPCY02E60/10
Inventor 吕豪杰杨重科张金涛
Owner 昆山聚创新能源科技有限公司
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