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.
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