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Self-Healing Electrode for Lithium Ion Battery

Stanford researchers have demonstrated for the first time a self healing electrode which can dramatically enhance the cycle lifetime of lithium ion batteries by applying Si microparticles with a thin layer of self-healing conductive composite. Cracks and damages in the electrode over the large volume changes of Si materials during lithiation and dilithiation were found to be able to self-heal automatically and thus greatly enhance the cycling stability. Batteries with these self-healing anodes have superior capacity and can cycle more than 100 times in half cells while retaining more than 80% of their initial capacity. The cycling lifetime is more than ten times longer than state-of-the-art anodes of Si microparticles. Stage of Research: 1) Proof-of-concept- Attained a cycle life ten times longer than state-of-art anodes made from SiMPs and still retained more than 80% of their initial capacity (up to ~3000 mA h g−1). 2) Continued refinement to improve performance and longevity 3) Testing other self-healing polymers and other electrode materials Applications: 1) For all types of lithium ion batteries to improve the cycling lifetime 2) Lithium ion batteries are currently used in cell phones electric vehicles consumer electronics and electrochemical devices.

Benefits:

1) Self-healing – this polymer coating can repair cracks within a few hours. 2) Cycling lifetime can be increased by more than 10 times 3) Cycle more than 100 times in half cells while retaining more than 80% of their initial capacity 4) Low cost

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