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Lithium ion battery

A lithium-ion battery, battery technology, applied in battery electrodes, secondary batteries, secondary battery charging/discharging and other directions, can solve problems such as the inability to ensure the positive effect of lithium-rich manganese-based solid solution materials, to avoid capacity decay, production process Simple, capacity-enhancing effect

Inactive Publication Date: 2017-08-29
AMPRIUS NANJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent application also only considers the change of positive electrode capacity, ignoring the average voltage and mass / volume changes of the battery, so it cannot ensure the positive role of lithium-rich manganese-based solid solution materials in full batteries

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0089] The cut-off voltage of charging and activation during capacity division is 4.4V; after capacity division, the charge-discharge cycle voltage window is 4.3V-2.8V;

[0090] Others are consistent with Comparative Example 1.

[0091] After testing, the volume energy density of the full battery (at a charge and discharge rate of 0.5C) reaches 645Wh / L, and the capacity retention rate of the full battery after 500 cycles (at a charge and discharge rate of 0.7C) is 87.2%.

Embodiment 2

[0093] Replace the electrolyte formula with: 1.2M LiPF 6 +Ethylene carbonate / ethyl methyl carbonate / diethyl carbonate / vinylene carbonate / fluoroethylene carbonate / propylene sulfite / succinonitrile / glutaronitrile / fluorobenzene (mass ratio 15:37:15: 1:10:3:3:1:1);

[0094]The cut-off voltage of charging and activation during capacity division is 4.6V; after capacity division, the charge-discharge cycle voltage window is 4.3V-2.8V;

[0095] Others are consistent with Comparative Example 1.

[0096] After testing, the volumetric energy density of the full battery (at a charge-discharge rate of 0.5C) reaches 666Wh / L, and the capacity retention rate after 500 cycles (at a charge-discharge rate of 0.7C) is 87.9%.

Embodiment 3

[0098] Replace the electrolyte formula with: 1.2M LiPF 6 +Ethylene carbonate / ethyl methyl carbonate / diethyl carbonate / vinylene carbonate / fluoroethylene carbonate / propylene sulfite / succinonitrile / glutaronitrile / methylene disulfonate / fluorobenzene ( Mass ratio 15:36:15:1:10:3:3:1:1:1);

[0099] The cut-off voltage of charge and activation is 4.7V during capacity division; the charge-discharge cycle voltage window after capacity division is 4.3V-2.8V;

[0100] Others are consistent with Comparative Example 1.

[0101] After the test, the volumetric energy density of the full battery (at a charge and discharge rate of 0.5C) reached 683Wh / L, and the capacity retention rate after 500 cycles (at a charge and discharge rate of 0.7C) was 88.3%.

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Abstract

The invention relates to a lithium ion battery which comprises an anode (1), a cathode (2), a diaphragm (3), an electrolyte (4) and an encapsulating material (5); an active material in the positive pole is that a lithium-rich manganese-based solid solution material and other lithium-containing metal oxide cathode materials are simply and physically mixed; the lithium ion battery with high energy density and good cyclic performance can be obtained through controlling the proportion occupied by the lithium-rich manganese-based solid solution material and the size proportion of the lithium-rich manganese-based solid solution material to the other lithium-containing metal oxide cathode materials and activating by utilizing the first charging process of a battery. The lithium ion battery provided by the invention is simple in preparation method, efficient and good in repeatability, and scale production of the lithium ion battery with high energy density can be really realized.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a high-energy-density lithium-ion battery and a method for using the same. Background technique [0002] New energy, especially the form of new energy represented by lithium-ion batteries, has been setting off wave after wave in China and even around the world in recent years. [0003] At present, China has become the core force in the research and development and production of lithium-ion battery electric vehicles in the world. On February 20, 2017, the Ministry of Industry and Information Technology, the National Development and Reform Commission, the Ministry of Science and Technology, and the Ministry of Finance jointly issued the "Notice on Printing and Distributing the Action Plan for Promoting the Development of the Automotive Power Battery Industry". big goals: [0004] 1. Product performance has been greatly improved. By 2020, the specific energy of the new lithiu...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/131H01M4/36H01M4/505H01M4/525H01M10/44
CPCH01M4/131H01M4/364H01M4/505H01M4/525H01M10/0525H01M10/446Y02E60/10
Inventor 王岑汪芳叶兰李喆张和宝
Owner AMPRIUS NANJING CO LTD
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