Introduction
Energy and Environment in the 21st century, humanity is facing two serious problems, the development of new renewable and clean energy future, the most decisive influence on the global economy one area of technology. Since the advent of development of lithium-ion fast, for it specifically to meet the mobile communications and the rapid development of power supply for laptop light, long working hours, long lasting, HP HSTNN-DB20 Battery, HP 395789-001 Battery, HP 396008-001 Battery, no memory effect and requirements of environmental pollution, etc.. The solid polymer electrolyte instead of liquid electrolyte to produce lithium-ion polymer batteries, lithium-ion battery is an important step forward, its main advantage is high reliability and processing, can be made in the structure plastic, so that the manufacture of ultra-thin and aspirations of freedom of a large battery can be achieved. Inspiron 1420 battery Inspiron 5100 battery
1, the structural characteristics of the lithium-ion
Positive power lithium-ion and negative active material is incorporated into compounds of Li + from the cathode emerge through the electrolyte to the cathode discharge, however, charge the battery and rejection process of Li + is actually back and forth between the two electrodes integrated process and prolapse, so that the battery is also known as “rocking chair battery” (Rocking Chair Batteries, abbreviated BCR). The basic scheme and the reactive response is as follows: HP HSTNN-DB20 Battery,
2. Polymer battery technology lithium-ion
2.1 polymer lithium-ion performance characteristics of the battery
Polymer electrolyte lithium-ion batteries is the use of solid polymer electrolyte (SPE) for lithium-ion batteries. Battery positive electrode current collector, the cathode film, polymer electrolyte membrane, a negative film, negative electrode collector pressed composite molding, outsourcing sealed plastic composite, hot melt sealing its edges to obtain polymers of the lithium-ion batteries. As a solid electrolyte membrane, there are no leakage problems, greater flexibility in battery design, can the need for series and parallel or a bipolar structure. Inspiron 8500 battery Inspiron 8600 battery
Polymer lithium-ion batteries have the following characteristics: HP HSTNN-DB20 Battery, HP 395789-001 Battery, HP 396008-001 Battery,① flexible formatting; ② superior energy (3 times the battery Ni-MH); ③ wide electrochemical stability window at 5V; ④ perfect safety and reliability; ⑤ longer life cycle, the loss of capacity less, use high volume ⑥, ⑦ wide range of applications.
The performance indicators are: operating voltage: 3.8V; specific energy: 130Wh/kg, 246Wh / L Life Cycle:> 300; self-discharge: 0.1% / month; Operating Temperature: 253-328 K, the loading rate: up to 1 hour 80% of capacity; 3h at 100% capacity, environmental factors: non-toxic.
Cathode Material 2.2
characteristics of the lithium-ion prices and is closely linked to the cathode material, in general, cathode material must satisfy: ⑴ requested discharge in the potential range, with the electrolyte solution and electrochemical compatibility; ⑵ moderate electrode kinetics; ⑶ highly reversible, stable lithium ⑷ statewide and good performance in the air. With the development of lithium-ion high-performance cathode material at low cost to research carried out continuously. Currently, research has focused on the cobalt oxide, lithium nickel oxide, lithium manganese oxide of lithium and other lithium metal oxides of transition. HP 395789-001 Battery,
Lithium cobalt oxide (LiCoO2) is the structure α-NaFeO2 with layered structure in two dimensions, suitable for lithium-ion deintercalation. Because of its preparation is simple, stable performance, high specific capacity, cycling performance, the greater the current marketing of lithium-ion batteries LiCoO2 as cathode material used. The synthesis methods include solid-state synthesis and low temperature method of solid phase synthesis, there are acid precipitation, sol-gel method with hot and cold, like the soft-chemical methods mixing organic. 40Y6799
lithium nickel oxide (LiNiO2) for compounds of the structure of rock salt have good thermal stability. As the rate of self-discharge requirements of the electrolyte is low, do not pollute the environment, resources are relatively abundant and affordable, is a promising lithium cobalt oxide cathode materials. Currently LiNiO2 mainly by Ni (NO3) 2, Ni (OH) 2, NiCO3, NiOOH and LiOH, and LiCO3 LiNO 3 by solid state reaction. Synthesis of LiCoO2 as LiNiO2 difficult, mainly because of the high temperature LiNiO2 easily decomposed into stoichiometric Li1-xNi1 + XO2,HP HSTNN-DB20 Battery, HP 395789-001 Battery, HP 396008-001 Battery, nickel ions in excess of lithium between NiO2 plane layer, prevent the spread of lithium-ion batteries, will affect on the electrochemical activity at the same time as Ni3 + Co3 + rare that, if the synthesis must be carried out under oxygen atmosphere [2]. HP 396008-001 Battery,
Lithium modified manganese oxide material cathode of traditional materials, this action is more LixMn2O4 spinel, it has a tunnel structure in three dimensions, more suitable for lithium-ion deintercalation. Lithium manganese oxide rich in raw materials, low cost, pollution, excessive heat and better security, the safety device on the requirements of the battery is relatively low, the material is considered the most promising cathode for batteries Lithium-ion batteries. dissolved Mn, Jahn-Teller and the decomposition of the electrolyte is considered as the result of the lithium manganese oxide as cathode material for the ability of lithium-ion batteries of the main reason for the loss
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