tailieunhanh - Lithium-ion Batteries Part 2

Tham khảo tài liệu 'lithium-ion batteries part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Towards high performance anodes with fast charge discharge rate for LIB based electrical vehicles 7 Carbon black content wt Fig. 5. Dependence of microcontact resistances R around active particles on carbon black content. Each bar represents the span of many 10 20 resistance measurements on various particles on the surface of the same pellet. Circles represent average values of the given series. Dominko et al. 2001 Origin of performance deterioration of carbon anodes with fast C D rates Despite that a fast rechargeable performance is one of the most important properties required for electrical vehicles the presently available commercialized LIBs show a poor performance in the fast charge discharge circumstances. For example the graphite anode shows decay in the specific capacity to 350 mA g at over 1C C D rate see Figure 3 . We will briefly deliberate on the possible origins of this performance deterioration of carbon anodes with fast C D rates. Poor electron transportation with fast C D rates In the case of fast C D process the electron transportation can be influenced by different factors from those for normal or slow C D rates. For example poor electron transportation in the anode may arise from three different origins viz. 1 contact problem between the current collect and the electrode component 2 low electronic conductivity of the electrode components and 3 low electronic conductivity of active material. 1 Poor contact at the interface of the electrode There are two kinds of the concerned interfaces in the LIB electrodes viz. the interfaces between the current collect and the electrode components and between the components of the electrode. Since these interfaces play a role of electron transportation pathway good 8 Next generation lithium ion batteries for electrical vehicles contact at the interfaces can lead to excellent cell performance. In particular under a fast C D process there can be a large volume deformation of the active materials which .

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